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Monowheel Glide ratio

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mau11(at)free.fr
Guest

Posted: Tue Oct 27, 2009 11:44 am Post subject: Monowheel Glide ratio

Hi all,

Does anyone have calculated the real Europa glide ration with the engine 

stop?

Thanks



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       --|--

--------(*)-------- 

Michel AUVRAY

mau11(at)free.fr

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raimo.toivio(at)rwm.fi
Guest

Posted: Thu Oct 29, 2009 3:51 am Post subject: Monowheel Glide ratio

Hi Michel,



I have you some info:



1) During test flight phase #1 (2007) I unfired the engine and trimmed 70 knots and saw -700 feet /min in the variometer. Glide ratio was 700 feet /min : 70 knots = 3,6 m/s : 36 m/s = 1:10.



- TOW was 520 kgs, prop was Warp Drive fixed blade angle  set 20 degrees and NOT windmilling ie. prop was not rotating.



2) During test flight phase #2 (2009) I unfired again my engine and trimmed 70 knots and saw this time -400 feet /min in the variometer. Glide ratio was 400 feet /min : 70 knots = 2 m/s : 36 m/s = 1:18.



- TOW was 537 kgs, prop was Airmaster and blades were feathered



During both cases the plane was XS Mono with speed kit (empty weight 401 kg /2007 and 412 kgs /2009) and it was clean (flaps & gear up).

I assume 70 knots gives the best glide ratio.

Notice: I have no idea what was an influence of possible thermal lifts during flights.

I think GD 1:10 equals about universal GAs like Cessna 172.



What a difference between blades in normal position or feathered ones!

That is also a remakable safety factor:



Imagine flying at 15000 feet. Stop the engine, feather blades and trim 70 knots.

After ½ hour you are still in altitude 3000 feet and the distance from an original position is 35 nm /65 km.



I do understand always smiling glider people - it is so beautiful to just soar.



These figures are just suggestive but I hope you got some idea.

I am sure you will very soon get more specific and detailed information...



I would love to know what´s glide ratio with gliding wings AND feathered prop (my guess: 1:25).



Raimo 

OH-XRT from Finland

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