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The Launch Rack Published by the Garden State Spacemodeling Society
National Association of Rocketry Section No. 439
New Jersey’s Oldest Model Rocket Club
Volume 31 Number 3 (Issue 174) May-June 2013
NARAM-55 & Molly Brown DOUBLE ISSUE! This Issue Chock-Full of Competition Plans, Designs, Tips and Techniques
To Give You GSSS – The Competitive Edge!
President’s Message
Arnie Klein
The March GSSS Launch
The March launch started off with
warm weather, and a light wind that picked
up later in the afternoon. Most of the people
at the launch were Radrockteers
members. There were no GSSS officers there
except myself. We launched a total of 46
rockets (measured by counting the left over
ignition wires). Two of the launches were "G"
level, and two rockets landed in trees, both were recovered. We had
two soil samplers, and two lawn darts. An attempt was made to have
a four saucer drag race, but two of the saucers failed to take off. A
attempt was made to use the Estes attitude measuring App with a
smart phone, but it did not work out very well. Over
good launch with a lot of congeniality.
----ArnieArnieArnieArnie
You can check out the iPhone application
Arnie mentioned in his President’s
Message at the Estes “Mobile” Web Site:
http://www.estesrockets.com/mobileapps. The app
looks pretty interesting and could have potential.
Additional information about each of the 4 program
apps can be found on the Estes Support page:
http://www.estesrockets.com/appsupport.
Hey! You think we could get rid of our optical
trackers, eventually? Then we could drop the
walkie-talkies too and just “txt” the altitude to launch base from the
iPhone and results could be posted to FacePage!
The Editor’s Pad
Dr. “Oooo - The Trooth Can Hurt” Bob KreutzI’m Still just “Acting” as the Editor…
Spring Means Contest Time!(You Can Clean Up The House Later…)
Oh Yeah? Tell that to my Wife…
WOW! Have you seen the schedule coming up??? Contests,
Funtests, Molly Brown Local Meet and then NARAM! Lots and lots of
COMPETITIONS! Do you have enough models to fly everything?
Well, maybe we can help out. I’m a bit of a technophile so, I’ve
scanned my plans and done a few online searches, even visited the
NAR Competition Model Plans site to come up with a few suggestions
for you, in case you’re sitting there scratching your head wondering
what to build. There are some wild ideas out there, but for the most
part, we’ll stick to proven designs and ones that work.
place to start is QCR, http://www.cybertravelog.com/qcr/
which carries models designed to “qualify” in just about any event.
There is just an incredible amount of information we would
to put in the Launch Rack this issue, just as a primer for each event,
but we can’t fit it all in! So, we have elected to fill the pages with
models and designs that you can use as potential qualifying entries
for both Molly Brown and NARAM. Some designs will be for the same
event in both competitions and will be designated so.
The March GSSS Launch
The March launch started off with
warm weather, and a light wind that picked
up later in the afternoon. Most of the people
at the launch were Radrockteers officers, and
members. There were no GSSS officers there
except myself. We launched a total of 46
rockets (measured by counting the left over
ignition wires). Two of the launches were "G"
level, and two rockets landed in trees, both were recovered. We had
two soil samplers, and two lawn darts. An attempt was made to have
a four saucer drag race, but two of the saucers failed to take off. A
attempt was made to use the Estes attitude measuring App with a
smart phone, but it did not work out very well. Overall it was a very
You can check out the iPhone application
ent’s
Message at the Estes “Mobile” Web Site:
. The app
looks pretty interesting and could have potential.
Additional information about each of the 4 program
apps can be found on the Estes Support page:
ou think we could get rid of our optical
trackers, eventually? Then we could drop the
talkies too and just “txt” the altitude to launch base from the
Editor’s Pad
Can Hurt” Bob Kreutz just “Acting” as the Editor…
Spring Means Contest Time! (You Can Clean Up The House Later…)
WOW! Have you seen the schedule coming up??? Contests,
, Molly Brown Local Meet and then NARAM! Lots and lots of
COMPETITIONS! Do you have enough models to fly everything?
Well, maybe we can help out. I’m a bit of a technophile so, I’ve
scanned my plans and done a few online searches, even visited the
ompetition Model Plans site to come up with a few suggestions
for you, in case you’re sitting there scratching your head wondering
what to build. There are some wild ideas out there, but for the most
part, we’ll stick to proven designs and ones that work. Another good
http://www.cybertravelog.com/qcr/, a Co.
which carries models designed to “qualify” in just about any event.
There is just an incredible amount of information we would like
this issue, just as a primer for each event,
! So, we have elected to fill the pages with
models and designs that you can use as potential qualifying entries
igns will be for the same
so.
Countdown 5Countdown 5Countdown 5Countdown 5
The GSSS Schedule for the remainder of 2013 is posted below.
As always, it has a little something for everyone:Apr 20 – Sport Launch (B Streamer Duration)
May 25 – Molly Brown Local Contest
1/4A-Helicopter Duration**
A-Parachute Duration
B-Streamer Duration**
Open Spot Landing
** NARAM-55 Events
Jun 29 – Sport Launch
Jul 22-26 - NARAM - Aurora, Ohio
1/8A-Parachute Duration Multi
1/4A-Helicopter Duration
1/2A-Altitude
A-Payload Altitude
A-Rocket Glider Duration
B-Streamer Duration
C-Dual Egg Lofting Altitude
Scale
Research & Development
Jul 27 – Sport Launch (1/2A Boost-Glider Duration)
Aug 31 – Sport Launch (4xA Cluster Streamer
Sep 29 – Sport Launch (Open Spot Landing)
Oct 26 – Sport Launch
Nov 30 – Sport Launch
Dec 28 – Sport Launch
Renewing Members
One & All!!Joe Dunay, Jenna Dunay, Dr. Bob Kreutz, Jude Mikolajczyk,
Peter Nein and Alex Nein
Molly Brown LocalMolly Brown LocalMolly Brown LocalMolly Brown Local
Participation is open to all NAR members in a geographical area
determined by the sponsor (GSSS) which simply means “anybody.”
Local Meets have a Contest Factor of 1. Entry Fees for Molly Brown
Local:
Division A (7-13 years old) Free
Division B (14 through 18 years old) $5.00
Division C (19 years old and older) $8.00
Division T (Registered NAR Teams) $8.00
Note: You must be an NAR Member with a valid membership card to
compete in this Meet.
National Association of Rocketry A
First of All, I can’t believe this will be the 55
55 YEARS worth of National Rocketry Competition!!! So, You going to
GO? If so, this issue of the Launch Rack will serve as a short “Primer”
as to selecting models and few techniques for successful
and sport flying. Ohh! Did I forget to mention having a great time at
NARAM http://www.naram.org/ and indulging in a week’s worth of,
yes, rockets, ROCKETS, ROCKETS!
Here we will present a number of designs for practically all
the NARAM events and 2 for Molly Brown, 1/4A Heli and B Streamer
being events at both-a chance to pra
Countdown 5Countdown 5Countdown 5Countdown 5----4444----3333----2222----1...1...1...1...
The GSSS Schedule for the remainder of 2013 is posted below.
As always, it has a little something for everyone: Duration)
Helicopter Duration**
Parachute Duration
Streamer Duration**
55 Events
Parachute Duration Multi-Round
Helicopter Duration
Rocket Glider Duration
Dual Egg Lofting Altitude
Research & Development
Glider Duration)
Streamer Duration)
Sport Launch (Open Spot Landing)
enewing Members – Welcome Back
One & All!! Dr. Bob Kreutz, Jude Mikolajczyk,
Peter Nein and Alex Nein
Molly Brown LocalMolly Brown LocalMolly Brown LocalMolly Brown Local MeetMeetMeetMeet
Participation is open to all NAR members in a geographical area
determined by the sponsor (GSSS) which simply means “anybody.”
Local Meets have a Contest Factor of 1. Entry Fees for Molly Brown
13 years old) Free
through 18 years old) $5.00
Division C (19 years old and older) $8.00
Division T (Registered NAR Teams) $8.00
Note: You must be an NAR Member with a valid membership card to
ssociation of Annual Meet
All, I can’t believe this will be the 55
th NARAM - that’s
55 YEARS worth of National Rocketry Competition!!! So, You going to
GO? If so, this issue of the Launch Rack will serve as a short “Primer”
as to selecting models and few techniques for successful competition
and sport flying. Ohh! Did I forget to mention having a great time at
and indulging in a week’s worth of,
ROCKETS! Here we will present a number of designs for practically all
the NARAM events and 2 for Molly Brown, 1/4A Heli and B Streamer
practice and hone competitive skill.
You may find a number of other designs on the internet by searching,
or simply visit the NAR Competition plans pages:
http://www.nar.org/competition/plans/competitionplans.html One design you could use has already appeared in the Jan-Feb-Mar
(2013) issue of the Launch Rack, the Sunday Brunch – for C Dual
Eggloft Altitude. You should note (from the NARAM.org pages): All
Altitude Events will be optically tracked. No fiddling with electronics
this time, so be sure to bring and familiarize yourself with tracking
powder and enhanced altitude visualization.
NARAM-55 and Molly Brown will be flown according to the
rules specified in the U.S. Model Rocket Sporting Code. Be sure to
review the regulations for the events being held! The worst thing
possible is to show up and be disqualified before you can fly because:
“I assumed the rules said such-n-such…” There are a few other
documents I have found, which may help with your designs and
strategy. http://www.narhams.org/library/rnd/StreamerDuration.pdf Is an R&D report by Chris Kidwell on the effectiveness of different
common materials that are used for streamer material. Another, by
Trip Barber, http://www.nar.org/competition/plans/pdf/Helicopter
Duration Presentation (Barber).pdf describes advances in the design
of helicopter duration models. I like a unique aspect of one particular
helicopter design on the NAR Competition Models page, by Bob
Kaplow: http://www.nar.org/competition/plans/pdf/Competition -
Rotacrock 20 Helicopter Model – Sport Rocketry.pdf. Kaplow’s design
incorporates tension bars (springs) for rotor deployment, instead of
the classic rubber bands.
Two events that we can’t publish models for are: Scale and
Research & Development (R&D). But, we can make a few suggestions.
If you’re flying Scale for the first time, purchase a bona-fide, true
scale model from Estes, Apogee or a major manufacturer. Many, if
not most, will come with supporting scale documentation and
photographs which you will need to submit in your scale pack. You
may not want to start with a Saturn V, but if its your favorite, by all
means go ahead. I’d suggest taking your camera and viewing all the
models entered in the Scale Viewing Room at the hotel. There you
will find some of the best craftsmanship and probably get a few
pointers on creating that masterpiece, museum-quality model. The
“Bible” of scale documentation is Peter Alway’s: Rockets of the World,
an absolute must, for building scale rocket models. Another good
source is: Small Sounding Rockets, by Richard Morrow and Mitchell S.
Pines. You should be able to find them on-line or on eBay.
Research & Development will send you back to grade school.
This event is a science project involving rockets. One place to start is
Tim VanMilligan’s 69 Simple Science Fair Projects with Model Rockets
http://www.apogeerockets.com/Rocket_Books_Videos/Books/69_Si
mple_Science_Fair_Projects_with_Model_Rockets. See the chapter
on how to do a science fair project based on scientific method,
written by Dr. Bob Kreutz. Other good sources may be found at:
http://www.apogeerockets.com/Tech/RD_Projects_from_the_NAR , which includes some tips on “what not to do…”
Competition Events – Potential Model/Motors 1/8 A Parachute Duration (MR) A Payload Altitude
Tempest - MicroMax II SkyQuestor - A3-4T
1/4 A Helicopter Duration B Streamer Duration
Mini-Rotaroc - 1/4A3-2T ASTRE/Barber SD - B6-6
1/2 A Altitude C Dual Egg Lofting Altitude
Zenith - 1/2A3-4T Sunday Brunch - C6-3 (5)
A Rocket Glider Duration Scale
Xebec - A3-2T Estes Kit - D-Region Tomahawk
Research & Development
Basic data and analysis Earn Flight Points
Test/vary 1 variable Eliminate additional factors
NARAM-55 “BEST OF THE REST” Schedule of Events Friday July 19th Tuesday July 23rd
7-8 pm FAI contestants social 7pm-9pm Cannon Auction
8pm-9pm FAI contestants briefing Wednesday July 24th
Saturday July 20th 5pm-7pm Manufacturer’s Poolside Social
9am-6pm FAI flyoffs 7 pm-10pm R&D presentations (A/B div.)
7-9 pm SNOAR Old Rocketeer Reunion Thursday July 25th
9-11 pm Beer Lofting 7pm-10pm R&D presentations (C/T div.)
Sunday July 21st 7pm-10pm Scale display/viewing
9am-3pm FAI Flyoffs Friday July 26th
7-8 pm Opening ceremonies 9am-5pm Competition Flying - Scale
8-9pm Mandatory contestants meeting 5 pm-6pm Pre-banquet social
9pm-11pm Scale and R&D turn-in 6pm-10pm Awards Banquet
Monday July 22nd
7pm-9pm NAR town hall meeting Take Full Advantage of all the Offerings!
Trick AND Treat!(?)Trick AND Treat!(?)Trick AND Treat!(?)Trick AND Treat!(?) or
“How to Eliminate Mis-Fires and Prep MMX Q2 Ignitors”
By: Dr. Bob Kreutz All too often, the Quest Q2 ignitors bend, crimp or
twist, shorting out the ignitor and preventing the launch. I employ a
little “trick” when igniting my single stage or booster motors. I spread
the bridge wire of the Q2 ever so slightly, bowing it out. This can
easily be done by inserting an unfolded paperclip between the bridge
wires and gently squeezing down with your thumb. Once placed in
the motor, the spread-apart bridge wires will have more intimate
contact with the propellant and
actually hugs the inside of the
nozzle - increasing retention! I
most often tuck a small piece of
tissue, wadding or flash paper
between the wires with a pencil
point to lock the ignitor in place.
No more mis-fires!
Descent Rate Calculator for Parachute Models 1/8A-PD at this year’s Nationals, is a Multi-Round event,
similar to FAI duration. MR is composed of 3 “rounds” each with a
“max” time limit. Flights over the max (in this case: 40s) and no added
time is awarded. Why chase that model for a 1/2 hour? Cool but Ugh!
http://www.onlinetesting.net/cgi-bin/descent3.3.cgi If you’re interested in determining descent times for Multi
Round, Predicted or Random Duration events, check out Jordan
Hiller’s online parachute descent rate calculator at OnLineTesting.net.
You will need to know the model’s mass (minus propellant weight),
expected altitude and parachute diameter. Projected altitude can be
obtained from projection programs or Apogee’s RockSim. Additional
information on design and properly sizing your parachutes see:
https://www.apogeerockets.com/education/downloads/Newsletter1
49.pdf
Before After Spreading
OK, First Off, if you’re going to fly a MicroMax model in
a COMPETITION, build it LIGHT! A 1/8A impulse motor does not
have a lot of “oomph” so every fraction of a gram counts when
you are building one! As a matter of fact, when I built my
SURGE, the heaviest part was the parachute! So make sure
you have a gram scale handy that can register 1/10ths of a
gram. Here are some ideas and strategies to keep in mind if
you’re flying 1/8A Parachute Duration (applicable to other
events as well!).
No launch lugs – although light in nature, launch lugs
are going to add up to 30% of the total drag on the model. Just
get rid of them and plan to fly your model either out of a tower
built for the model, or a piston launcher (floating head
preferably) for MicroMax motors – or both.
Materials: The only true “tube” you will use is the
short motor tube for the MicroMax motor (T2Plus from BMS or
Flis). You do NOT need a thrust ring – motor tape will prevent
the motor from thrusting through the model. The body wall
can be made from a number of materials, lighter the better.
They include Vellum or Tracing Paper, Printer Paper, Graph
Paper, Epoxy coated Tissue Paper. The technique is simple:
curl it or roll it and connect the edges with stick glue.
Centering rings are made from Index Card Paper – but it is too
heavy to make the competition body tube out of. Remember,
these are not models meant to last a great number of flights, 3
or 4 at the most, but just like in FAI International competition,
you only need maximum performance for the flights in the
event. When it is done, so is the model.
Parachutes: 2 problems – weight and folding. There
are 2 materials that suit micro-impulse motors, ¼ Mil Mylar
and Dry Cleaner Bag Polyethylene. Everything else seems
heavy and inefficient. Unfortunately, Mylar is stiff and relies on
the folds to “spring open” to deploy the chute. This requires
the user to NOT fold the material tightly and it becomes
problematic when trying to stuff a large chute in such a small
MMX tube. On the other hand, Polyethylene sticks to itself
especially in humid weather and requires talcing or baby
powder to insure it opens. Shrouds add weight too – use
sewing thread, the lightest you can find – but use more of
them! Increasing the shroud number to 12 to 16 reduces air
spillage from the chute and keeps it aloft longer. Use a round
chute – mine is made from dry cleaner bags, 12 shrouds. I use
silver mylar tape to connect shrouds to the canopy, punched
out round with a hole punch (put the tape on wax paper first
before punching, or it will just stick to your hole punch!!! ;-D
Nose Cone: Make your own. If you are going to use a
balsa cone, sand it as smooth as you can using auto body
sandpaper down to 2000 grit (it is made even finer!) and color
if you must, with magic marker. No sealant, no paint, they
both add weight. Then, hollow out the nose with a Dremel tool
to further reduce the weight. The parachute will be all the
nose weight you need. As an alternative and if it is available to
you, you can make a 1/2oz fiberglass nose or a vacuformed
nose made of thin 0.030” styrene.
Lastly: *Practice, Practice, Practice.* Never show up at
a competition with a model or design you have never flown
before. Make a boilerplate model and get a few flights in on it
to work out the bugs and any quirks, the model may have.
Now comes the tricky part: Getting a 20” parachute inside a tiny, tiny tube! This
chute is made from dry clear bag plastic & thread. It weighs 3.3 grams.
Forms & Molds used for making nose cones
Index card centering rings are
flimsy, use rims to strengthen
An epoxy-tissue tube can be formed on a paper cone.
Beware! Epoxy weighs a lot!!!
This one
weighs
2.2 grams
Tabs face the direction the body slides
on. Apply Stik-Glue to assemble tubes
I used a long T2 tube to center the T2+
motor tube, transition and centering ring.
Two holes forburning thread,1/16" diameter
2.25
14.5"
BT-5
Balsa BT-5nose cone
Hinge line location
2.5"
12" to end of tube
Rotors are 1" wide (chord), 12" long.Made from medium-light 1/16" balsa.Balsa should be somewhat stiff so it willnot bow outward much when folded forboost.
tiprootroot
roottiptip
12"
Rotors are fragile and easy todamage or break while sanding thetrailing edge. Below is how to sand thetrailing edge of all rotors before cuttingout from balsa sheet. Middle arrows point in direction ofleading edge. Top view for modelsrotating counter-clockwise
tiproot
roottip
1 2 3 2 3
Cut away rotor 1, thensand trailing edge of
rotor 2
Sand trailingedges of
rotors 1 and 3
1 2 3
Mini-ROTAROCPlans page 1 (Design & assembly)
How to tie elasticthread to hold
rotors for boost
Pull snug, then tie knot
1/8 by 1" slot tovent
ejection charge(not facing arubber band)
Launch rod goesbetween blades,fin, and body. No
launch lug isused.
Drawings show model which would rotatecounter-clockwise as viewed from above.
Top Viewof rotation
Klett RK2 hingehalves glued totube & wrappedwith thread, withglue applied to
thread last
PARTS: light 1/16" balsa (fins & rotorsupports), Med-light stiff 1/16" balsa(rotors), 14.5" BT-5, BT-5 nose cone,Klett RK2 model plane hinges (3), pinsor model railroad spikes, 1/16" by 2.25"rubber bands.
3"
2.25" long 1/16" rubberband, two may be
necessary for properdeployment tension
4"
.75
7/8 (.875)2.0
2.5
Grain
Full size fin (three)1/16 light balsa
Leading Edge
Trailing Edge Triple size airfoil shape (3" chord)
Actual size airfoil
to root
OptionalRotor tip shape
Leading Edge
Trailing E
dge
Full size rubber band standoff &dihedral angle support
(3 from 1/16" balsa, note grain)
split segment of 1/8" launch lug
Root,Glue to rotor
Pin or model R.R.spike to anchor
rubber band
Down angleachieved bytwisting outer
portion of blade
Twist tip of blade upnearly horizontal for
more efficiency, but willwork OK if blade is same
angle all across
Blade flat at root, mustbe angleddown outtowards tip to rotate
Blade angled at root,will rotate fine withoutany additional work.
Perpendicularhinge mount
New Skewedhinge mount
To Tip To Tip
BOOST FRONTVIEW OF MAJOR
PARTS (NOT TO SCALE)
Root
Mini-ROTAROCPlans page 2 (with full size templates & details)
ROTOR AIRFOIL
For best performance, buildmodel carefully so that partsare not grossly out ofalignment and so it willdeploy and rotate properly. Keep model lightweight inselection of parts, wood, andin construction. UseCyanoacrylate glue. For finish, use only 1 coatof thinned clear dope on finsand nose cone, 1-2 coats ofclear thin dope on rotors. Donot use any paint. Forcoloring, use magic marker.
Construction:
(Full size, top view)
Power: 1/2A3-2T, A3-2T, A3-4T
8-1/2"
8-1/2"
3/4"
dihedral detail
airfoil cross sectionD
C
B
exhaust port
1/2 Wing - full size
3/32" light C-grain balsa, airfoiled and tissued
grain
XEBEC-IIIA 1/2A - A rocket gliderAn original design by George Gassawaythat appeared in Jan. 1979 SNOAR News.Redrawn by Wolfram von Kiparski. 2001 National Association of Rocketrypermission is granted to make personal copiesfor the purpose of building this glider.
SHEET 1 OF 2
c
E (drill hole for thread)
Music wire spring detail - full size
side view
front/rearview
top view
aftend
aft end
Pylon - 3/32" balsa
B
10 degree tilt, max
boom stab
spring
rudderpins
Pop Elevator Detail
- tie thread to stabilizer at hole E.- hold stab flat against boom, and string thread around pins C and D and then though pod exhaust port.- tape end of thread to pod.- increase thread tension by pulling thread over pin B on pylon.
D
C
E
XEBEC-IIIA 1/2A - A rocket glider Sheet 2 of 2
Full sizerudder (make 1) 1/20" light balsa
Full sizeStabilizer (make 1) 1/20" light balsa
hinge line
Materials List
3/32" x 1/4" x 17" spruce boom3/32" x 3" x 16" light C-grain balsa sheet1/20" x 3" x 9" light C-grain balsa sheet2-1/2" BT-5 podshort balsa nose cone for BT-51/8" launch lugs4" 0.015" music wire for pop-elevator spring3 pins placed at B, C, D on pylon and ruddertissue or monokote for hinge material
D
C
2001 National Association of Rocketry permission is granted to make personal copies for the purpose of building this glider.c
You Can BEAT CHAD RINGS’S RECORD ! ! !
On August 4th
, 1993, I had the pleasure of establishing one of my
US Records in A-Payload Altitude. Optically tracked to 142 meters on an
A3-6t motor, the record stood for a decade until March 23, 2002, when
Chad Ring greased out just the 1% he needed, to take the lead with 144m.
I haven’t flown A-Payload Altitude since then, but with a few simple
modifications on this 1993 record setting model, I predict that you, yes –
YOU can BEAT CHAD RING’S US RECORD ! ! !
Why not give it a try at this year’s NARAM in Aurora, Ohio? I’ll
Help You! OK, the model you see to the right was made from fiberglass.
If you are able to make fiberglass models, this is an advantage: they are
strong enough and lighter than most paper/balsa models. With Altitude
events, light weight is preferable but “optimum” weight is the best. This
can be calculated using design and simulation programs such as RocSim
from Apogee. With a standard 1 ounce NAR payload , it is already over
optimum weight. Any weight saving measures will yield a higher altitude!
Remember This!!! Payload models are allowed to Separate into
2 pieces! [See: US Model Rocket Sporting Code (the "Pink Book") 25.4/3.5]
Don’t risk a DQ from a broken shock cord or lanyard – and for Pete’s sake,
don’t try to catch your model! The ejection charge will throw a 1 ounce
standard sand payload forward, with incredible force. Design the Payload
to return with a small strong parachute maybe 10”-12” in diameter. Use
Kevlar thread from Flis or Apogee for the shrouds – over the canopy! Let
the motor section return separately with a small streamer, 1/4mil silver
mylar, 1” x 10” long.
Modify the model with some of these suggestions: Use light,
strong 16 lb Kevlar Thread for the Lariat as a substitute for the Dental
Floss and 30 lb on the recovery Lanyard - only if you decide to connect
both halves, otherwise you can get away with 16 lb if it is just attached to
a streamer. If you have had problems with 16 lb light Kevlar breaking, use
the 30 lb heavier weight. The Lariat is sized to loop around and be tight
around the payload once it is inserted. The rear portion of the payload
itself serves as the shoulder of the payload section. 2 small plywood
squares glued opposite each other, inside the top of the motor section,
serve to support the payload and prevent shifting in flight. Instead of thin
plywood, Carbon Fiber Accent Plate, 0.008” (both sides glossy) from CST
can be used for the new modified fins. These 3 are slightly smaller and
thinner to reduce drag and placed all the way rearward. You MUST piston
launch this model! A floating head piston is preferable if you are familiar
with how to use them, otherwise a standard piston will work, as well. You
may also wish to launch from a tower for some additional stability.
Fly the model on an A3-4t. Buy a bunch of them, old and new.
Weigh your motors. Check the “fill” of the motors on the ejection end.
There are variances when Estes makes their motors. You want to find the
ones with extra propellant – they weigh more and are filled closer to the
top. When you have found a sufficient number of “overfilled” motors,
check the nozzles to be certain they haven’t been over-inserted, deeper in
the casing, giving you a false impression that the motor is overfilled. That
is why it is also important you weigh them. Lastly, scrape the inside of the
nozzle where the propellant is located. Sometimes extra clay from the
nozzle manufacturing process remains as a thin layer over the propellant.
It will prevent motor ignition and you will misfire. The clay is white-grey
in color. Scrape it with a pin or small screwdriver until a small amount of
the black propellant comes out. And Remember…
YOU CAN BEAT CHAD RINGS’S RECORD ! ! !
(and Mine as well !!!)
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The ULTIMATE The ULTIMATE The ULTIMATE The ULTIMATE
SOLUTIONSOLUTIONSOLUTIONSOLUTION (to last month’s GSSS Word Search Puzzle)
Hmmm, OK. If you’re reading this, let us
assume you didn’t solve the “puzzle” contained in the
April Issue of the Launch Rack. It was a little bit more
thatn a simple Word Search. Yes, it was a real puzzle,
with a real solution AND it actually was the real HIDDEN
CONTEST!
The funny thing about puzzles is the more
complex they are, the more clues they have to have in
order to solve them. Those clues are called: the
“DIRECTIONS” and for our contest puzzle, that’s where
they were. So let’s go through the solution:
First was the classic word search. You had to
find 24 words contained within the grid of letters. No,
NAR and USA were not inside other words, they were
there all by themselves. If you circled all the terms, you
should have had as your final grid mark-up:
If you read
all the DIRECTIONS,
you would have
noticed something
strange. Almost
looking like a typo,
certain words or
phrases were in
bold print, the first
one of which was…
D-I-R-E-C-T-I-O-N-S,
indicating the clues how to solve it were in bold. Your
second clue in bold was the word HIDDEN, indicating
there was something else in the grid besides a word
search. Now, solving the word search would be fun by
itself, but there was more – HIDDEN. Third clue was the
word ELIMINATION, yes, something else for you to do.
If you “eliminated” all of words in the word search, your
grid would look like this:
I told you –
it was not your
usual word search,
didn’t I? Let’s see
what was hidden
there according to
the directions. The
next clue in bold
were the words
BACKWARD, UP
and OUTSIDE THE
BOX. The only way to go backwards and up is to start in
the lower right hand corner, the opposite of where one
would normally start reading. Did you notice that none
of the word search words were in the borders? Reading
up you would find “SENDxTOxDRxBOB”. Reading
backwards from that point could also be found:
EMAIL/ME/BY/APRIL/THIRTIETH/ORBITBOYBOB/AT(@)/
COMCAST/DOT(.)/NET – the HIDDEN directions for the
HIDDEN CONTEST. You had to email me your solution
by then to that email address.
So far so
good? So what’s
the solution? The
last clue in bold
read BETWEEN and
FIRST FEW LINES.
Eliminating all the
previous answers
leaves us with the
remaining letter
grid. If you did not
eliminate the
answers, the hidden message or clue, could still be
found in the letters BETWEEN the word search answers
in the FIRST FEW LINES. The hidden clue read:
T-A-K-E/M-E/T-O/Y-O-U-R/L-E-A-D-E-R.
While that
answer would solve
the puzzle, you had
one more answer to
give if you were to
win the hidden
contest. So, WHO is
YOUR LEADER?
BARACK OBAMA of
course!!!!! Uh, No,
wait, too many letters for the first name. So, my GSSS
“Rocket-Science-Rack-Reader” Who IS Your Leader?
Well, its our good friend and President:
~ A R N I E K L E I N ~
Had you emailed me by April 30th
, with that as
your final answer, You would have been a winner in
GSSS’s first HIDDEN CONTEST. Feedback is appreciated
and an indication of whether or not you would enjoy
more of these brain-draining mind-benders. You might
be interested to know, that contained in the title of the
issue’s President’s Column was the phrase “Words from
YOUR Fearless LEADER” in italics. Now, admittedly, it
was in Spanish, but we did give you the URL of Bing
Translator just in case you haven’t taken your Spanish
as a Second Language classes yet!
“ “ “ “ PPPP aaaa rrrr tttt i i i i nnnn gggg SSSS hhhh oooo tttt ssss ““““
The Launch Rack
Volume 31, Number 3
Issue 174
May-June, 2013 (Back on Schedule…)
The Launch Rack is the official
publication of the Garden State Spacemodeling
Society and is published for the enlightenment and
entertainment of the membership. It is published
bi-monthly.
You are invited to send your articles,
photos, letters and hard earned cash to the editor for
his enlightenment and entertainment, ect., and for
publication. This publication is by and for the
membership.
Articles appearing in the newsletter may
be used by other publications provided proper
credit is given to the author and this newsletter.
Jack Sarhage, Chief Editor
24 Canterbury Court
Piscataway, NJ 08854
E-mail: gssshq@optonline.net
Dr. Bob Kreutz, Lackey to the Chief Editor
506 Hunters Road
Brick, NJ 08724-4614
The Launch Rack
c/o Jack Sarhage
24 Canterbury Court
Piscataway, NJ 08854-6206
May-June, 2013
Volume 31, No.3 (Issue 174) Expiring NARAM, 2013
1
2
Photos taken by
Fred Taverni with his
camera rocket. Picture 1
was taken at 160 ft and
shows the immediate area
around the launch rack.
Picture 2 was taken at 425 ft
and shows the surrounding
area.
The rocket is a
modified Aerotech Initiator.
A payload section was
added to house the camera
and related electronics. The
Rob Nee -designed AYUCR
timer controls an R/C servo
that mechanically depresses
the shutter button on the
on-board Canon SD-1000
digital camera. The AYUCR
timer is programmed to
trigger every 1.5 seconds
beginning at lift-off. A Raven
altimeter initiates recovery
deployment at apogee with
the motor ejection charge
serving as a backup and
records altitude vs. time.
Using this data it is possible
to determine the altitude of
each photo. The rocket
descends on two separate
chutes… one for the booster
and the other for the
payload. [REAL NICE Results,
Fred!– Ed.]
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