My Tiger60 ARF has been my most often flown for about a year now. It started out with an OS61FX 2-stroke. Flew great. No complaints. Then the new engine itch started, and needed to be scratched with the brand new OS75AX. That itch had actually been scratched for about a week with one of my OS91FXs in the Tiger. I was breaking the 91 in to go into a new H9 Corsair. So...........

I've actually flown a Tiger60 with a 61, a 75, and a 91. Which would I recommend if you could only get one? Flip a coin. No kidding. Any one of them is excellent.

But truth is, I would rank them, but the ranking is almost a dead tie at the top. Both the 61 and 75 rank as 1st choice. My Tiger flies about the same with either. You can feel the difference in power, but darned if the flying is measurably better with the extra power. And that's why the 91 winds up in 2nd place. It's extra power is almost totally wasted. When I pulled it to put into the Corsair, I absolutely did not shed a tear. Yeah, it's brute power is absolutely obvious, but it's just as obvious that it adds almost nothing to what the plane can do that's worth doing.

With the 61 priced at $180, the 75 at $220, and the 91 at $230, which one would I buy for the Tiger60? The 61, no hesitation.

Any of them have negatives on the Tiger? The 91 uses a bunch more fuel for little gain and prop choices are inhibited by the ground clearance. The Tiger wasn't designed with clearance for the props a 91 can swing.

BTW, all three fit the same and the change in CG isn't significant enough that the sucker flies much different.

I like the 75, but won't be buying another until they're appreciably cheaper than the 91. The 91 is definitely a better deal for only $10 more. Only problem with the 91 is that it's wasted on a lot of 60 size planes, and the Tiger is one it's wasted on.