Hi,
I use a os fs91II with my u can do with a apx 15X4w prop . seems the engine doesn't have enough power (easpecialy to climb out from hanging the plane ).

Anyone has the same problem with this engine? , what would u reccomand?

Thanks for help
[&o]

I think a DA 150 would be perfect. Maybe even a little underpowered. LOL

Seriously, in my opinion this plane needs to be overpowered. I had an OS 91 fx and it just did not have enough pull in vertical and out of a hover. I replaced it with a Magnum 120 two stroke and I love it. I mean the power is unbelievable and the plane still floats perfectly. Flies very light....battery in the tail and the CG is at 5 7/8.

I am under the impression that a YZ110 spins that same size prop at the same speed as the Magnum 120....Can anyone input on this? From what I have heard a YZ 110 is very good for this plane too. I want to get a 4 stroke so I may get the YZ 110, but I have also been pondering the YZ 140. Anyone's info on this would be great.

stick with the two strokes ive had 2 with fourstroks and i with a 2 stroke both 91's the 2 stroke is a 100% better

Dori, the consensus is pretty much Saito 100

Or, you can try a RCS 140 gas engine. it works for me