RE: Sig Four Star .40 Build Thread!!!!!!!!
The ST40 will pull it just fine. My 4*40 has had numerous engines on it, all fun to fly.
Magnum 52 4 stroke
TT 46
ST 51
Saito 45
Saito 65- my favorite for this plane
Saito 82- a beast, way over the top!
OS 55ax on it currently with 12x5 APC, full throttle never needed, but there if you want it.
Thanks for the build thread!