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L3 video

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Your Prezis

on 18 February 2016

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Transcript of L3 video

L3 Final Presentation
THANK YOU!!!!!!!
GROUP 7
Overview
Maximise glide distance
Modular, easily-adjustable, light-weight, easy-to-replace components
F
W
N
D
T
Y
X
Ramp angle
Motor
Driven wheel diameter
Wing AR
Airfoil
Tail angle and size
CAD
Ramp angle = 15 degrees
5:1 motor gear ratio
Aspect ratio = 5
NACA 6607
35 gram
3.5 m/s exit velocity
3.5 m glide distance
Manufacturing
nylon screws
Adjustable tail-setting angle
Glide Testing
Tail setting angle + mounting position adjusted
3 Wings were tested...
AR5 Rib & spar wing
AR5 foam flat plate
AR1.5 foam flat plate
Ramp angle: 5 degrees
Final Weight: 48.6 g
Theoretical VS Experimental
Did the model fly straight?
Did the model achieve the desired flight trajectory?
Did the model stall?
Predicted distance: 3.5 m VS actual distance: 2.6 m
Challenges
Friction losses unaccounted for
Smaller reaction force at front-driven wheels
Uneven slippage
Shaft twist causing uneven torque distribution
Insufficient friction between the tires and ramp.
Roll perturbations
Lessons Learnt
Many assumptions made for simplification of the mathematical model will not hold true
model flying straight
linear lift-curve slope
model not slipping
model not stalling
ASSUMED
Optimisation of one factor may lead to de-optimisation of another
TESTING DAY
Initially designed
Full transcript