ORIGINAL: Ed_Moorman
Prop Muffler Jett tuned muffler
12.25-3.75 13,000 13,900
Here's what I previously got on my OS .55AX
12.25-3.75 14,500 (no muffled rpm)
it is roughly the equivalent of the OS .55AX for a lot less money.
Err.. 600 RPMs down on a 12.25x3.75 prop is hardly in the same league as the OS 55AX.
What I *would* be interested in is the throttling characteristics. How does it respond after being held at 1/3 throttle for 20 seconds then transitioned quickly to full. That's where so many otherwise good engines just can't hold a candle to OS/TT and other more expensive engines.
While the OS, TT etc will snap to full RPMs immediately, far too many of the cheaper alternatives will stumble either a little or a lot. That can be the difference between having fun with your 3D plane and looking for a bag to hold all the bits :-)