Difference between the Rotax ULS 2 & 3 ...

Discussion in 'Home Builders and Sport Pilots' started by TreeTopFlyer83, May 5, 2019.

  1. TreeTopFlyer83

    TreeTopFlyer83 Pre-Flight

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    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.
     
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  2. Cluemeister

    Cluemeister Line Up and Wait PoA Supporter

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

    Andrew Morris Filing Flight Plan

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    Jetcat3
    It has to do with the type of gearbox being installed. ULS2 refers to fixed pitch, ULS3 is for a hydraulic constant speed propeller.
     
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  4. TreeTopFlyer83

    TreeTopFlyer83 Pre-Flight

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    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.
     
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