Ys vs Os

[R50]

I'm looking at the Raptor 90 3d, and not sure on an engine/pipe combo to go with. Which one's make the best power and reliability?

[vapochilled]

I'm going to bet that most if not all responces say OS

But, in my fixed wing days, I flew YS, and loved them, It's a question of lead or follow, I don't think you'll notice a difference at sport flying levels
just my $0.0000000000002 worth

[Mr.HillBilly]

If you go YS make sure you can find parts. OS you can get parts from about anyplace.

I am mean to my OS motors and they always come back for more. I vote for OS.

Also the crank threads are a different pitch, so you may need to find other parts if you are using a tapered nut or a screw on clutch.

[HeliRaptor]

I also vote OS. My current 90 size motor is the OS 91 SZ. I was running the Curtis MP5 on my Raptor 90SE with the OS 91 SZ Hyper with Pump. I just sold that machine with Engine and Pipe.

I have another OS 91 SZ Hyper (Non Pumped) for the Avant Aurora that I just ordered. I believe I will be using a Hatori pipe on the Aurora.