skyfox1 Posted November 27, 2017 Share Posted November 27, 2017 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. Link to comment Share on other sites More sharing options...
planesmaker Posted November 27, 2017 Share Posted November 27, 2017 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. Link to comment Share on other sites More sharing options...
cscotthendry Posted November 28, 2017 Share Posted November 28, 2017 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. Link to comment Share on other sites More sharing options...
skyfox1 Posted November 28, 2017 Author Share Posted November 28, 2017 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 Link to comment Share on other sites More sharing options...
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