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Old 05-22-2008, 11:21 AM   #1
Petruccio
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Default 3W 55 US real thrust?

Hi everyone!
I purchased a giant 25% YAK by GP and installed a ZDZ40 RV engine, it was my first giant after numerous glow airplanes. But when I got it airborn it turned out that 40CC is too little for this aircraft, though the manufacturer claims that ideal choice is Fuji43CC. The real weight of the bird with ZDZ40 is approx. 15 pounds (7 kgs). I decided to change the engine to 3W 55 US, as there is a little room form the rear carb. Have any of you ever used this engine? What is the maximum thrust? I plan to install Biela 22x8 prop and Supersonic Pitts muffler.

Thank you!
Petr.
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Old 10-23-2008, 10:31 AM   #2
mark nichols
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Default Re: 3W 55 US real thrust?

Hi Iam building the same combo with zdz40, is the plane underpowered for imac style flying or is it just underpowered for 3d.

Mark
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Old 10-24-2008, 12:26 AM   #3
Petruccio
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Default Re: 3W 55 US real thrust?

Hi Mark!
Well, to my mind if you install ZDZ 40 it will be enough to fly straight just like a 0.46 trainer or perform basic maneuvers, but still you'll find a lack of power. After I had installed 3W 55 my Yak changed greatly! Now I can hover and pull it up easily, perform any 3D or fly F3A. I think you'd better build it with 3W if you plan to fly precision and 3D. Also, the Yak has a factory built heavy tail (in case of my aircraft), that's why a heavy 3W balanced my plane perfectly.

Petr.
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I'll never quit drinkin', family and huckin'!
GP Yak-54 25% 3W-55US - tru 3D trainer
Comp-ARF Extra 300SX 3W-110B2 CS on KS 86 - I'm lovin' it
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