Difference between the Rotax ULS 2 & 3 ...

[TreeTopFlyer83]

Help guys, it's you old aggravating friend with more questions about the Rotax engine. I have decided that will be the engine that I was going to put into a Kitfox STI but that has changed as well. I am going to go with the Rotax 912 ULS (100hp), I just need to know the difference between the 2 & 3? I know that the 2 is 6 lbs lighter than the 3 but all the other dimensions look the same. That being said and it may not even be relevant the new kit will be a Just Aircraft Highlander with the Rotax ULS. Also going to go with the Kiev #293 prop as I've read that setup works pretty great together. It's also about 700$ cheaper than the Whirlwind prop I was going to go with. Sorry for rambling on folks and thank you all for your time and information.

 

[Cluemeister]

I didn't know there was a 2 and a 3. Interested to hear the difference myself.

 

[Andrew Morris]

Help guys, it's you old aggravating friend with more questions about the Rotax engine. I have decided that will be the engine that I was going to put into a Kitfox STI but that has changed as well. I am going to go with the Rotax 912 ULS (100hp), I just need to know the difference between the 2 & 3? I know that the 2 is 6 lbs lighter than the 3 but all the other dimensions look the same. That being said and it may not even be relevant the new kit will be a Just Aircraft Highlander with the Rotax ULS. Also going to go with the Kiev #293 prop as I've read that setup works pretty great together. It's also about 700$ cheaper than the Whirlwind prop I was going to go with. Sorry for rambling on folks and thank you all for your time and information.

It has to do with the type of gearbox being installed. ULS2 refers to fixed pitch, ULS3 is for a hydraulic constant speed propeller.

 

[TreeTopFlyer83]

It has to do with the type of gearbox being installed. ULS2 refers to fixed pitch, ULS3 is for a hydraulic constant speed propeller.

Thank you for that helpful information. I’m guessing the 2 would work fine since I’m not going with a constant speed prop. I simply refuse to spend north of 10 grand for a prop.

 

[Rich Little]

I know this is late but I have owned a kitfox 7 for 13 years and almost 1900 hrs with same engine. A 912uls and kiev prop #293 like you wanted.
It is still running great but feel its time to renew both engine and prop. I plan on going with the same configuration.