Engine increase factor for float plane conversion?  
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Engine increase factor for float plane conversion? - 6/1/2007 2:51:56 AM   
5487


 

Posts: 316
Joined: 12/5/2005
From: Houston, TX, USA
Status: offline 		Is there a rule of thumb for how much to increase the recommended engine size when putting a land plane on floats? How much more power is needed in order to compensate for the added drag?

I'm not interested in 3D or breaking the sound barrier.

TIA
       Post #: 1

RE: Engine increase factor for float plane conversion? - 6/1/2007 4:48:38 AM   
Wayne22



Posts: 4456
Joined: 4/10/2002
From: Edmonton, AB, CANADA
Status: offline 		Most guys I know don't bother changing the engine...they accept that it will be a bit heavier and a bit slower than the same plane on wheels. The only models I have seen that had troubles due to lack of power were the smaller 25 and 1/2A size floatplanes..

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All I ask is for a chance to prove that money can't make me happy......

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RE: Engine increase factor for float plane conversion? - 6/7/2007 11:49:10 PM   
driedjello



Posts: 124
Joined: 9/28/2005
From: Omaha, NE, USA
Status: offline 		I also think that if you have something like an OS .40 you probably need to up size a tick. I have an Avistar with that engine and she could barely break away from the water. I went to an os .46 and it was like a whole new plane!

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RE: Engine increase factor for float plane conversion? - 6/9/2007 2:45:11 AM   
Newc


 

Posts: 1047
Joined: 10/23/2002
From: Leesburg, IN, USA
Status: offline 		My 80" Midwest Citabria flies very well - on wheels - with a Saito 91. On floats I wish I had a significantly larger engine, maybe a 1.20. My floats are pretty much scale, so each one is about the size of a .40- or .60-sized plane fuselage.

(in reply to driedjello)
       Post #: 4

RE: Engine increase factor for float plane conversion? - 6/12/2007 3:32:48 PM   
brianengy


 

Posts: 21
Joined: 9/18/2006
From: Richfield, MN, USA
Status: offline
quote:

ORIGINAL: driedjello

I also think that if you have something like an OS .40 you probably need to up size a tick. I have an Avistar with that engine and she could barely break away from the water. I went to an os .46 and it was like a whole new plane!



I converted a Easyfly2 to a float plane and I could barely get it off the water. I'm going to try a .46 engine.

(in reply to driedjello)
       Post #: 5

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