boost glider design
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Illinois Aerospace InstituteUniversity of Illinois
SpaceSpaceGrantGrant
Boost Glider Design
Illinois Aerospace Institute
Department of Aeronautical and
Astronautical Engineering
University of Illinois
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7/27/2019 Boost Glider Design
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Illinois Aerospace InstituteUniversity of Illinois
SpaceSpaceGrantGrant
Boost Glider Design
Introduction
What are we trying to do?
Maximize Endurance
Important Factors to Consider
Balance
Wing area
Glide Slope
Speed
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Forces
Lift always acts perpendicular to the direction of flight.
Drag always acts parallel to the direction of flight. Weight always acts towards the ground, regardless of
the the direction of flight
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Stability
Stability is the Balancing of Forces
Which hopefully your plane will do naturally
Stability in the Boost phase
Center of Gravity (CG) must be above forward of the
wing Center of Pressure (CP).
Stability in the Glide phase
CG must be behind of the wing CP
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Boost Phase
Thrust counter acts gravity and drag to make the
aircraft climb
Lift from the wing and tail counteract the momentfrom the rocket engine
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Boost Phase
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Wings
Reasons to have a small wing
Lower drag and weight
Will go higher and require as shallower glide angle
Better Boost performance (High Wing Loading)
Wing loading is the ratio of total weight to wing area
Higher Aspect Ratio (AR) for a given area
AR is the ratio of the wing span (b) squared to the total wing
area (S)S
bAR
2
=
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Wings
Reasons to have a large wing
Slower glide speed
Will result in increased the glide time
For given span, higher strength for Boost phase
Will prevent wing shear, which in general is not a goodidea if you plan on gliding for longer than it takes to fall
out of the air
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Glide Phase
A component of the weight is used to overcome
drag
Lift is used to balance the remaining weight
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Stability
Roll Stability (Dihedral)
15~30 degrees
Yaw Stability
Vertical Stabilizer (tail)
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Stability
Pitch Stability
PitchingMo
ment
Weight of glider
Neutral Point
Lift of
Stabilizer
Lift ofWing
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Stability
Tail Heavy (CG to far aft)
Nose Heavy (CG to far forward)
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
The Generic Glider
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
What do all those letters mean?
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
What do all those letters mean?
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
So, how should I build this?
Fill out your sheets
Cut your pieces
Sand
Remember to check the
design constraints with
your results
No BLOOD!
Bevel the root chords ofyour wings for good
dihedral joint
Dont worry too muchabout the airfoil shape of
your wing
Building Steps Building Tips
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
So, how should I build this?
Assemble the fuselage
Balance glider with clay
Test flights
Dont glue you fingers
together (too many times)
Boost portion first
Tail next
Wings LAST (check your
CG locations)
The less the better
Dont break it
Building Steps Building Tips
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Layout Wing on Balsa
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Layout Tail on Balsa
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Illinois Aerospace InstituteUniversity of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Layout Pieces
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Illinois Aerospace Institute
University of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Assemble Nose
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Illinois Aerospace Institute
University of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Assemble Tail
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Illinois Aerospace Institute
University of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Assemble Fuselage
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Illinois Aerospace Institute
University of Illinois SpaceSpaceGrantGrant
Boost Glider Design
Assemble Wing
S/2*sin DA*2
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