kitfox 7 propeller advice

[Dave Holl]

High wing
interesting comments, the UK Light Aircraft Association who certify home built aircraft in the uk have advised against the IVO as while they say it is good on the smaller rotax engine they feel that with the 912ULS is a bit too violent for the prop as there have been a number of issues with the prop blades cracking, they have advised me that the warp would be a better prop and that there is more experience with this prop on a rotax 912uls in the uk so the story thickens!
Dave

[Av8r3400]

Wow! What a bureaucratic nightmare...

I know of several people running 912ULSs with IVO medium props without incident. The IVO Ultralight works well and is recommended for the UL (80 hp) and the 2-strokes, but the ULS (100 hp) requires the Medium prop for the reasons you have given.

[SkySteve]

I use a Warp medium square tip. I understand some have this prop "shaved" into a taper tip. What is/are the advantage(s) of the taper tip?

[Av8r3400]

A "Square Tip" 3-blade warp is too heavy for the 912 gearbox and will cause damage. Rotax will not warranty any damage to the gearbox if a square tip Warp is installed. This is also directly from LEAF and Lockwood seminars at Airventure.

Tapering the tips lessens the mass (and gyroscopic effects) sufficiently to prevent damage to the gearbox.