P09231MSD II Spring 20083

Matt Greco: Project Manager Shawn O’Neil: Lead Engineer Will Pisarello: Electrical Systems Engineer Phil Davenport: Industrial/Process Engineer Brian Lindquist: Industrial

Engineer/Procurement Specialist Eric Lannan: Airframe Structural engineer

5lb 5lb

10lb

y

x

Balsa Material Properties

•Young’s modulus 1130 – 6000 Mpa

•Shear modulus 100 - 500 MPa

•Tensile strength 0 - 75 MPa

•Compressive strength 3.5 - 27 Mpa

Material properties from Matbase.com.http://www.matbase.com/material/wood/class4-5-10-years/balsa/properties

1

MN

MX

-696657

-558153-419649

-281145-142641

-4137134366

272870411374

549878

APR 23 200921:32:58

NODAL SOLUTION

STEP=1SUB =1TIME=1SX (AVG)RSYS=0DMX =1.542SMN =-696657SMX =549878

1

MNMX

X

Y

Z

-93015

-69725-46435

-23144145.674

2343646726

7001693306

116596

APR 10 200908:59:29

NODAL SOLUTION

STEP=1SUB =1TIME=1SX (AVG)RSYS=0DMX =.248992SMN =-93015SMX =116596

Flight Observation Probable Cause Actions Taken

Wing sheared off during flight

Purchased ply cut on RIT laser cutter is 3 layer, compared to 5 layer ply cut by Foxlite, Inc.

Absorption and cure times increase for plywood applications

Change ply adhesive to Gorilla Glue

Redesign wing to accommodate double brace thickness and top sheeting

Cyanoacrylate (CA) adhesive was more effective in balsa joints than ply joints

Epoxy found to not completely cure

Enables onboard control switching between two pilots or a single pilot and an autonomous system

Uses:- Autonomous system testing with pilot backup- Control ‘hand off’ between pilots a significant distance apart

for extended range flights

~$50 total per system.

Airframe A Segregated Budget

Raw Airframe with motor Component Qty Piece Price Total PriceMotor HXT42-60 1 $ 35.79 $ 35.79 Landing Gear 1 $ 25.27 $ 25.27 Linkages, Connectors, Hinges, misc 1 $ 50.00 $ 50.00 Purchased Wood 1 $ 25.00 $ 25.00 Propeller 1 $ 1.00 $ 1.00 Covering 1 $ 5.00 $ 5.00 Composite Material 1 $ 5.00 $ 5.00

Subtotal $ 163.56 ElectronicsServo S3010 2 $ 19.99 $ 39.98 Receiver Supreme 28 LXKYK3 1 $ 39.99 $ 39.99 Servo S3114 2 $ 14.99 $ 29.98 Speed Controller 1 $ 16.79 $ 16.79 Battery eliminator circuit 1 $ 19.95 $ 19.95

Subtotal $ 146.69

Airframe without batt $ 293.75

BatteryLithium Polymer 1 $ 45.11 $ 45.11 Telemetry (Optional) 1 $ 627.97 $ 627.97

Total $ 338.86 w/Telemetry $ 966.83

Date Amt Desc1/6/2009 $ 627.97 Eagle Tree, Telemetry System

1/19/2009 $ 276.18 Tower Hobbies, remaining mat $ 93.00 ACP-Composites $ 18.00 Digikey, control switch

1/28/2009 $ 75.20 National Balsa1/29/2009 $ 104.76 HobbyKing, 4 batts

$ 93.30 HobbyKing, electronics $ 50.00 FoxLite, laser cutting

2/6/2009 $ 66.05 Performance Hobbies, misc $ 9.77 Home Depot

2/20/2009 $ 41.69 Performance Hobbies, misc2/26/2009 $ 364.51 Tower Hobbies, stock

$ 77.56 National Balsa, stock $ 318.09 Hobby King, stock

3/11/2009 $ 82.44 PCB layouts3/13/2009 $ 11.86 Home Depot3/18/2009 $ 12.58 Tower Hobbies, crystal

$ 134.90 Boosterworks, camera $ 89.86 Dan's Crafts

3/23/2009 $ 42.12 Digikey, parts for pcb3/24/2009 $ 60.78 National Balsa3/26/2009 $ 73.95 Tower, clear coat, receiver

$ 75.75 Hansen Hobbies, cables3/30/2009 $ 33.47 Michaels, Balsa sheet

4/3/2009 $ 82.44 Performance Hobbies, rcvr crys $ 156.23 Dan's more materials $ 16.66 Home Depot

4/11/2009 $ 35.34 Performance, props & gear4/14/2009 $ 69.78 National Balsa

$ 11.42 Magnetics4/21/2009 $ 195.25 HobbyKing, replacement batts4/23/2009 $ 27.00 Balsa for new wings

Total As Of 5/12/2009 $ 3,427.91