OS .91FX for Four-Star 60
12-22-2004, 09:28 AM
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OS .91FX for Four-Star 60
Hello. Just ordered a Four-Star 60 and I am leaning towards powering it with a .91FX seeing how it shares the same footprint with the .61FX. Any ideas/opinions on this? Is this going to be too much power for this plane? I was wanting this engine for Top Flites P-47 anway.
12-22-2004, 10:30 AM
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RE: OS .91FX for Four-Star 60
The 91FX will swing a 14 or 15" prop well with good power, and use quite a bit of fuel. I would save the the 91 for the warbird and find another engine for the 4* as it is a sunday type flyer, meaning it does not 3D well so no need for a lot of power, besides a lighter bird flys better. Any good 60-70 size motor will fly the 4* great.
12-22-2004, 12:48 PM
#3
RE: OS .91FX for Four-Star 60
This depends on your skill. The engine is not too much. I have had 2 4-Star 60s, both bashed into Kawasaki Tonys, powered with an OS .91FX and a Magnum .91XLS. Both had Ultra Thrust mufflers for more rpm on 14-6 APC props. Both had excellent vertical-as far as you want. Landing was still slow and easy. I did more the main gear to the wings for a more scale look.
You can also run the OS on a 13-6 or a 12-8 and let it rev. The .91 makes it a whole different airplane.
You can also run the OS on a 13-6 or a 12-8 and let it rev. The .91 makes it a whole different airplane.
12-22-2004, 02:35 PM
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RE: OS .91FX for Four-Star 60
If you want power then don't fool with a 91FX, get a YS, Jett or Saito and be done with it. The 4 star series of planes were not designed for 3D. One can hang a trainer on the prop with enough power, but that does not necessarly make it a good 3D bird. Likewise installing a heaver engine than is necessary is defeating the purpose of a light great flying plane.
12-22-2004, 06:54 PM
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RE: OS .91FX for Four-Star 60
Thanks for the input Taildragger. I think I will go ahead with the .61FX. I have not decided on the .91FX for the TF P-47 anyway. I might just 4-stroke it instead. I am building the Four-Star for more building and tail-dragger experience as this is only my second kit. My first was the Tower Hobbies Fun-51 and I also bought a Sig Something Extra kit along with the Four-Star. Should keep me busy this winter along with the other projects I have going.
12-23-2004, 09:01 AM
#6
RE: OS .91FX for Four-Star 60
You might want to consider the OS91 surpass. I fly my 4*60 with one and it is a great combination. As indicated, the 4* is not a 3D plane, and the surpass gives it plenty of power for most aerobatics. Some have even taken off the outside bay on the wings to get greater roll rates, but I fly mine stock and enjoy it for what it is.
12-23-2004, 10:48 AM
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RE: OS .91FX for Four-Star 60
The 91fx is the same weight as the 61.There is no weight penalty over a 61fx.
I would go for the 91.Same weight but more power.Thats a no-brainer to me.
I would go for the 91.Same weight but more power.Thats a no-brainer to me.
12-23-2004, 12:33 PM
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RE: OS .91FX for Four-Star 60
Go ahead and install a 91FX, you will probally have to get longer gear so the larger prop will clear, then there is the expense of the fuel for the 91FX which is a fuel hog at 10 flights of 12 min for a gallon of 15%. Yes power cost money, but we love to over power everything.
