# torsion of a racing car aerofoil.

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An aerofoil is manufacturing from a carbon fibre reinforced polymer skin thickness 1.5mm with the geometry, lengths and areas given in the accompanying assignment XL spread sheet containing a corresponding SET No. ranging from 1 to 14.

DaveDance
School: University of Virginia

Attached.

Mean E fibre=350 GPa
Effective length =1.6m
Lift coefficient =1.6
Chord=28mm+50mm+76mm+68mm
=222mm.
a)Shear:
Shear=QV/Ib

(i) Centroid of beam function
=(Aiyi/Ai) +(A2y2/A2) +.... +(AnYn/An)
={(918*1,628)+(2658*1.572) +(2258*1.522)+(118*1.446)} /5952
=9284.184/5952
=1.55984274m
(ii) Statical moment
=5.952*1.6

1|Page

=9.5392
(iii)Moment of inertia
={(Ii+Aid²) +(I2+A2d²)+..... +In+An(d²)}
I=0.222*0.26
=0.005792
A=918+2658+2258+118
=5952
d=0.02...

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