I have procured a Yak 54 with a 56 inch wing span. The plane says it weighs about 5.5#. I am in a delima about what power I want to use.
I am stuck between a Saito .91 to 120 or a YS 120. I have some experience with Saito's and OS four strokes and cannot decide. I have a 120 OS four stroke that I could use but it is in a Bucker Jungman by Carl Goldberg that I plan to sell with the engine in it.
Which engine between the Saito's and the YS would be best for this bird? Which has the best performance?
I fly Carl Goldberg Sukhois with 180 Moki's and like a lot of power when it is needed. I also fly a Bucker Jungman by Carl Goldberg with a Saito 180 for power. Just trying to give someone my power preferences.
Thanks in advance for your input.
Jim Clausen

Saito 82 with a 13x4 prop should do just fine.

saiwto .91 or 100, something more would be extra weight which would sacrifice the planes characteristics and would give you unecessary power. My 6lb UCD rockets with my saito 100 and 15x4W using 15% NITRO.

I would go Saito 100

yes the yak has only a 4 foot 6 inch wing span so i would say the 80 size 4 stroke . saito 82 or os 81.

Thanks,,
Jim