Hello all, I have been out of the hobby for a couple of years. The last plane I had was a sig four star 60 with os 90 four stroke, I really enjoyed that plane.
I am looking at the forty size four star and was wondering if the os 70 four stroke was to much motor for the plane? I guess most would say go with the 52 four stroke, I am not shure how power difference there is in the two engines.

I have a OS 48 FS in mine with 11-6 APC and it flys great, so the 52 will be even better

Go with the .70 , you can allways pull the throttle back.

hi

currently flying the 4 star 40 with a saito 56 four stroke. this engine has plenty of power for this plane. a 70 would be flyable but a lot more power than needed.

good luck and happy flying

pt19 flyer

I think the 70 would work great! Mine has flown most recently with a Saito 82, lots of fun. Have also had a Saito 45 on it, still fun flying on the wing. Other engines that have pulled it around are ST51, TT46Pro, 52 Magnum 4st.

Mine has an OS 52 and it's plenty of power. I had to move the battery to the back to get it to balance. So with a 70 you might run into weight and balance problems.

I have that engine in my 4* 60 and the plane hates to land. That may be your only problem. You might be able to take off at idle!



Have fun!