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Thread: Lift Engine Capacity

  1. #1
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    Default Lift Engine Capacity

    Could someone please be so kind as to clarify a craft regulation in HC115.

    At 2.5.A.f it states, in F2 and F3, that the calculated or allowed capacity of the lift engine can be doubled if the fan is connected directly to the engine crankshaft.

    So assuming the allowed capacity is for a 50 cc 2 stroke, does this mean that one could actually use a 100 cc 2 stroke?

  2. #2
    More than 30 posts! Club Member garagewayne's Avatar
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    Default Re: Lift Engine Capacity

    That is correct

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    Default Re: Lift Engine Capacity

    Quote Originally Posted by Supastar View Post
    Could someone please be so kind as to clarify a craft regulation in HC115.

    At 2.5.A.f it states, in F2 and F3, that the calculated or allowed capacity of the lift engine can be doubled if the fan is connected directly to the engine crankshaft.

    So assuming the allowed capacity is for a 50 cc 2 stroke, does this mean that one could actually use a 100 cc 2 stroke?
    Hey up,

    You might struggle to find an engine of such small capacity with enough Horse output.
    Whereabouts have you been looking?

    Good luck.

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    Default Re: Lift Engine Capacity

    Hi Aaron.

    I have a 50 cc 2 stroke mini moto race engine giving around 4-5 HP. With a decent exhaust, I'm told I could double that. This engine has supposedly been tuned to 14 HP. This would have to be geared but is within the capacity limit (my thrust engine is 398 cc 4 stroke).

    And there are 100 cc 2 stroke air cooled kart engines giving around 17 HP but it would be a question of where the revs come for the reduced power requirement.

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    Default Re: Lift Engine Capacity

    Quote Originally Posted by Supastar View Post
    Hi Aaron.

    I have a 50 cc 2 stroke mini moto race engine giving around 4-5 HP. With a decent exhaust, I'm told I could double that. This engine has supposedly been tuned to 14 HP. This would have to be geared but is within the capacity limit (my thrust engine is 398 cc 4 stroke).


    And there are 100 cc 2 stroke air cooled kart engines giving around 17 HP but it would be a question of where the revs come for the reduced power requirement.
    Hey up,

    Doubling the output of an engine just with an exhaust sounds optimistic to me but I'm not 2 stroke expert.

    Kart engines are somit I hadn't considered for lift as they have gears which adds weight and gets in the way a bit for mounting.
    Thats not to say they can't be used, especially when they are fairly cheap.

    Good luck.

  6. #6
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    Default Re: Lift Engine Capacity

    its getting an engine that will run slow enough to be direct drive yet have enough power to do the job

    I use a Yamaha RXS100 for lift but it needs to rev at 8,000 to get about 12hp, so I have use pulleys to reduce rpm at the fan, I can do that as I have a 600 four stroke as thrust in a F2 craft.
    Fred Wilson now ex F1X, oh-dear!

  7. #7
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    Default Re: Lift Engine Capacity

    Most if not all 100cc kart enguines rev far to high to give enough HP direct drive. To exploit the doubled lift engine capacity, it MUST be direct drive, i.e straight on the end of the crank. No gears, no belts.

    Jamie

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