Flying in spain

I recently spent one week in Spain, flying from Santa Cilia de Jaca. Here are some nice pictures !

Santa Cilia Village

The airfield

The colleagues who helped me discovering this nice region in flight

AD ready to go

Here is a summary of the 4 flights performed with AD during this week :

Also some nice pictures from the sky during those flights :

Cross country sailplane computer

Here is a computer for sailplane cross country flying. It helps at flying in security while taking the full benefit of sailplane performance.

This is "old school" stuff, I have been taught into this by François Ragot, who was in the WGC once in the 50's - 60's. It is a 100% failsafe device !


Two version of the computer are available :
- The initial "big" version, ideal to learn to compute with.
- The panel version, to be placed among others instruments.

A short user book is also provided.

Download the computer.

The panel version is installed in my LS6, I use it in parallel with Cambridge 302/303, as another (failsafe ;-) ) source of information.

If you happen to build this computer, just send me a photo of it : matthieu.scherrer 'at' free.fr

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