ORIGINAL: GaryHarris
My GP Big Stik 40 will show up tomarrow. Tonight Ill start stripping the electronics out of the trainer and pull the Mangum 52 4 stroke out. Orginally I wanted to put that motor in the Big Stik and save the 52 2 stroke for the SSE. But I went and asked the guys on RCU and naturally they said no, it would be underpowered. All I got was confused.
The Magnum 52 rfs has enough power to pull the LT-40 weighing in at about 7 lbs dang near unlimited vert, but not enough power to pull a 5 1/2 lb Big Stik off the ground with allmost identical wing loading?
What to do, what to do?
Go with the 52, it will be fine. I recommend a 60 4c only because I didn't want you to out grow it too quickly. The difference between the LT40 and the Stick is the wing. The LT40 has a flat bottom high lift airfoil, the stick will have a symmetrical airfoil, which won't make as much lift so you'll use the engine more.
Use the 52 and have fun, don't treat it like a NASA job.