Splais, Here is a reprint of a 22" prop experiment I did last month on a Brison 3.2 Something to think about.... >Today I tried a few different props on a Brison 3.2 attached to my new 18 lb.+ Yak 54. I have been using a Menz 22/8 S on another aircraft with a Brison 3.2 also and have been happy with the combo. So today I compared a Menz 22/8 S, a Xoar 22/8 and a Vess 22A on my new airframe. The comparison was made by using my eyes, ears and a Glo-bee tach. The weather was perfect with high pressure, temp. at 85 degrees and very low humidity/dew point at sea level. All tests/comparisons were made with the same needle settings and flying a level pass at about a 25 ft altitude 1/4 throttle. Pull to a 90 degree vertical upline and add full power. First up was my tried and true Menz 22/8 S. Static rpm, the usual 7200 with the Brison . The vertical upline was very respectable but the airplane began to noticably slow its ascent at altitude(10 mistakes high). Next up was the Xoar 22/8.. Static rpm only reaches 6450 and has me a little worried although it is much quieter than the Menz. I repeat the identical procedure and the airplane seems to climb a bit higher before it started to slow its ascent. I am pleasantly surprised. Now comes the Vess 22A. Static rpm 6540 , a little higher than the Xoar and almost as quiet. This time the airplane keeps climbing (although not rocket like) until it is just a speck in the sky and I can barely see it. Sort of like the Energizer Bunny. Reminded me of a tractor in low gear going up a steep hill! So I think I will be using the Vess 22A on my new Yak.