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All Forums >> TEAM RCU >> TEAM RCU - Josh Glavin >> power to weight ratio
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power to weight ratio - 7/25/2006 3:10:00 PM   
farminred


 

Posts: 115
Joined: 10/4/2005
From: beaman, IA, USA
Status: offline 		Hello,
I am just preparing my self to enter the world of 3D. I am looking at the great planes 27% Cap 232 12.5-14lb plane. I have read and heard that you need a 2:1 power to weight ratio for you engine. This means that I would need an engine that produces 28 lbs of thrust. that size of engine would not fit on to this size of plane. is it true that you need a 2:1 power to weight ratio for true 3D manuvers?

Please help me resolve my quandry.

thanks

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RE: power to weight ratio - 9/25/2007 3:32:24 AM   
mithrandir



Posts: 680
Joined: 7/16/2003
From: adelanto, CA, USA
Status: offline 		2:1 thrust to weight really only exists with Foamies!!! lol
With electrics, basically you need 150 to 200 watts per pound.
With Glow... an OS 160 will 3D a 12 pound plane adequately at sea level.
OS now has a 200 that would really haul that CAP Around!!!

Typically with Gas planes... a DA100 will throw around up to 28 pounds
and a DA150 will throw around 37 pounds... with authority... of course they will fly heavier planes,
but the pullout from a hover is less then spectacular.....
in this video,

http://media.putfile.com/FUTABA-and-Super-Extra-002

I am flying a 39 pound (Empty) Super Extra at 2800 feet and 80 degrees F and a MENZ 32 x 10 prop. At about 1:10 you can see me pull from the hover.. yeah.. she pulls out... but it is no rocket launch!!
While learning 3D, particularly Hovering and TR'ing... the extra power is most beneficial!

< Message edited by mithrandir -- 9/25/2007 3:33:20 AM >

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