Hello. I usually just slap a prop on the engine if its in the size range. Thats not gonna work anymore. I have a senior telemaster, saito 91, I had a 14x8, the airplane went around real nice, but I never got full throttle. So I put a 14x6, and I got full power, but the airplane almost stalls if any lower the 3/4 throttle. The telemaster should float with the wing. I was thinking of going down to a 13x8, but going down from a 14x6 to a 13x8 will give me more pitch, but less diameter, soI'm not sure. Any suggestions/opinions on what to do?

Can you check the RPM at full throttle-something is wrong here. Your problem should be just the opposite-not being able to get it down. How much does the plane weigh. This plane should float forever at idle let alone 3/4.

Sounds as though you need to go back to your 14 X 8

Sounds a little like a CG problem. Or it could be your ailerons are both slightly up, happened to me. My PT-40 would drop like a stone at low speed, now it floats forever.

Hi!
15x4 or 15x6 is the best prop to use !!!!

It does sound like the CG or the engine not getting up to power. Maybe a throttle problem?? The Sr, is one of those planes you should be able to hand launch and it will float all day. Wish I could state the best prop for your engine and plane but testing is the only way I know how to do it. As long as the engine is still within it's working RPM range prop testing is a must but that plane should fly with rubber band power. Double check the CG.

i have a Telemaster that used to use a OS SF61 with a 13x6 it was awesome....i slapped a 91 magnum 4 stroke and my prop of choice for that airframe was a 15x6 vess... the engine wasnt turning high rpm but it just felt right. For a trainer li wouldnt go over a pitch of 6

14x6 should be about right for that Saito or perhaps an APC 14x7. I'm perplexed at why a Telemaster would stall below 3/4 throttle with any .91 4-stroke up front. Have you tached the engine at all at full power and at idle? Something is strange here.

It can't be the engine, The Sr. will float in as well with the engine running or dead stick. I flew mine with an old OS .61 and it was just fine.

I agree it shouldn't be the engine. But perhaps the throttle isn't working correctly, could be too 'tight' from idle to open. I'd like to know how the engine is actually running before I attack the plane setup. It's probably a combination of things and we don't have enough info.