RE: Sig Four-Star 60
The Sig Four Star 60 will fly well with a broad range of engines. Saito's 65, 80, 91, & 100. Os/Magnum 70/91.
As you can see, the Saito 100 will have a lot of unneeded power.
I used a OS 91 in mine. It performed very well.
Enjoy,
Jim