Results from the Wind Tunnel

Some time has been already spent analysing wind tunnel results, they can now be presented, at least partly.

Here are screen shot of drag polars, as obtained during the test.




Note that the test were repeated over the different days : it can be seen that reproductibility of the result is not garanted at low speed (V=20m/s).

The Excel file containing the summary of results versus predictions can be found here.

Thanks again to the participants for accepting their prediction to be compared to measurements from the windtunnel !

Nice shot !

Here is a nice photo arrangement of AD in the garage, made by my brother Vincent.

End of the wind tunnel cession

Today was the last time of wind tunnel testing.

Some bugs in the coefficient have been detected, some post processing will be necessary before releasing official data. So that comparison will not be possible before some days.

Please be patient !

Some news from the Wind Tunnel

Here are some photos from the wind tunnel.

As the operating & recording system of S4 wind tunnel has jsut been updated, it is likely the release of the results will be delayed. Proper check of all the results will be necessary first.

Aerodynamic prediction worshop - End of prediction period

The Jibe 2 is entering the windtunnel this week. Today was riging period, tomorrow will be the first test with wind on.

Now the period for prediction has ended ! Here is a summary of the result i got, from 6 differnt people / team.

The excel file with more results.

Next part will be the comparison with the outcome of the test !

Here are some details about the methods used for those predictions.

	Method
MSch	Wing & tail + interaction : Miarex (Xfoil/lifting-line coupling, N=9 for wing, N=2 for tail) Fuselage : Xfoil + Mangler transformation Lateral : AVL + drag effect in aero axis (Miarex)
TPla	Xfoil plus 3D transpositions Simplified Cdi assumption Fuselage effect on Cm from in-house rule (from flight test & statistical approach)
ADe	XFLR5-V4
Jo&Stef	VSAERO : Linearized potential code, coupled with BL calculation
PLu	AVL for stability & induced drag Xfoil for airfoil drag with N<5>
FMe	XFLR5-V3

LS6 interior refurbished !

The interior refurbishment of my LS6 (AD) is now finished.

The masterpiee (if I can says so...) is the hand carved wooden stick, made from a footboard...


At least it makes it unique !

The fuselage was also polished.
I am now thinking of which decoration to create for the season to come.

Model aerodynamic prediction workshop - Update

Some update concerning Jibe 2 wind tunnel test project.

The preparation of the wind tunnel test by the two students in charge, Thomas & Sylvain, is still ongoing.

The wind tunnel cession will take place at S4 facility between the 10th & 14th of march 2008.

The airframe to be tested was just received from Flybiwo.

It must be prepared for receiving the inner measurement balance. Aileron & elevator will be installed, and their efficiency evaluated.