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drag polar and V speedsdrag polar and V speeds

 
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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Wed May 03, 2006 3:50 am    Post subject: drag polar and V speedsdrag polar and V speeds Reply with quote

Paul,

I've done some glide and sink speed testing but it was mid day when the
thermals were active. To do this well it must be during very calm air,
which I'll do at some time. I guess that regardless of what the factory
says, the empirical testing should give me what I want to know. What I
meant by Vy varying with weight was that when flying solo, the Vy would
be less than when flying at MTOW which is the flight weight at which
the V speeds are normally reported. Yes, the Vy and Vx are proportional
to the square root of the flying weight.

Thom in Buffalo


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Thom Riddle
Buffalo, NY (9G0)



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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Wed May 03, 2006 11:46 am    Post subject: Re: drag polar and V speedsdrag polar and V speeds Reply with quote

Allegro-ers,

After extensive searching, I found what I was looking for and have attached three files (graphs). These are empirical results of actual wind tunnel studies of the SM701 airfoil, which was originally designed for a high performance sailplane. No wonder it is difficult to get the Allegro to come down without slowing down to the mushing region!

Thom in Buffalo


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SM701 Cl vs AOA graph.tif
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SM701 Cl vs AOA graph.tif


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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Wed May 03, 2006 12:05 pm    Post subject: Re: drag polar and V speedsdrag polar and V speeds Reply with quote

I could not attach more than one file at a time for some reason I don't understand. So here is a second file.

Thom


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Thom Riddle
Buffalo, NY (9G0)



Don't worry about old age... it doesn't last very long.
- Anonymous
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