I had a 15x10 on my Venus II when it was powered by YS 110. GREAT performance, but was a bit much for that engine on 20% nitro.
I would try it on the 1.25 with higher nitro content.
ORIGINAL: MTK
ORIGINAL: gjesion
Don't need another prop, was just curious. I have a Venus II with a Saito 125 and am running a 15x8 and am thinking about a 16x8. Power is good, but do not have unlimited verticals, but they are more than adequate. The plane seems to fly slowly, but has plenty of power for loops etc. I am very new to pattern and am still trying to get the trims correct.
Regards,
Jerry
All the things the others mentioned plus one thing no one else has until now....In addition to increased speed, higher pitches will produce a noticable difference in noise output by the engine-exhaust system-prop combo. Same is true for electrics. One thing certain, the more noise you hear the greater degree to which power is being converted to noise rather than thrust
12'' pitch (for varying diametrs) seems to be a magic pitch for pattern airplanes. A very good balance of thrust, speed, brakes, noise.
Suggestion, rather than increasing diameter to 16'' and maintaining pitch at 8'', consider increasing pitch to 10'' on your set-up. Don;t know if the Saito 125 can haul a 15x10 tho, so you should experiment a little or get input from a better flier at your club that uses that set-up. The other thing to keep in mind is that 4 strokes benefit greatly from higher nitro so the 125 could haul the 10'' pitch with more nitro, possibly