912 Gear box hub bolt pattern

[skyfox1]

Hi could someone tell me if the bolt pattern on the prop hub of a Rotax 912 ul or uls is different to a rotax 914 please

 

Cheers Geoff.

 

 

[planesmaker]

I believe there maybe a difference between very early 912 and later, 4" as opposed to 100mm. Not sure when they changed. Perhaps a call to floods will confirm or otherwise about a difference.

 

 

[cscotthendry]

On the later model Rotax engines the bolt pattern is different to the earlier engines. One of them is a bolt circle of 100mm dia and the other is 4" (101.6mm), but I can't remember which one is which.

 

 

[skyfox1]

Thanks for your information all sorted now couldn’t work out why my prop wouldn’t fit bolt pattern a lousy 1.6 mm difference .

 

Cheers