Took the new 59 inch fixed pitch bolly for a test flight today and compared it to the 58 inch ground adjustable IVO prop.The 2 improvements were a slightly better straight and level cruise speed with the Bolly
5150 Ivo prop was 5250.Much quicker response in power with the Bolly,especially with low level flights,no lag
in power as was with the IVO.The biggest let down was the climb rate,which was only 380 fpm full throttle at 6250IVO was 6350 and climb rate 400 fpm .the temp in the morning was 25 degrees as was the same with the
IVO prop,solo weight was the same me 88kg as was with the IVO. Tried to lean out the mixture as the plugs
were black, running rich,still could not get past 6250rpm.On a scale 1-10 I would give it a 5.Save your money and stick with the IVO