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Thread: Koolprop on jabiru

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  1. #1

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    Default Koolprop on jabiru

    I replaced my wood 60x34 prop with a new 67 inch two blade koolprop with scimitar blades. I flew my kitfox with the new prop today and was pleased.
    The wood prop was dynamically balanced and still shook the windshield compass so badly from cavitation I could not read it. The engine would not rev past 2800 even in a dive.

    Now there is no vibration at all and much quieter. I have the pitch adjusted for 2800 static. It now climbs at 1200 fpm at 70mph and will rev to 3150 level flight

    The wood prop cruised at 2250 rpm at 75mph
    The koolprop is now 2400 rpm at 75mph but much smoother.

    I flew for 1.5 hours today and still need to re learn the landing approach. The new prop is like a brake at idle and I lose airspeed much quicker. With practice I will figure out my finals.

    My top speed is about the same but with less load on the engine. I'm very pleased with my purchase.

  2. #2
    Super Moderator Av8r3400's Avatar
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    Default Re: Koolprop on jabiru

    Congratulations!

    There's a lot of positive buzz about the Kool/Luga props these days.
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
    YouTube Videos

  3. #3
    Senior Member
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    Default Re: Koolprop on jabiru

    Which Kitfox model do you have? I've played with a number of different props since I rebuilt my Avid MK IV. Ended up back with the 64" square tip warp drive 2 blade. What kind of speed were you making at the 3150 rpm. JImChuk

  4. #4
    Senior Member cubtractor's Avatar
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    Default Re: Koolprop on jabiru

    I'm curious as well. I've been running a Prince 64 x 34 with great results. I haven't heard much about the Kool prop.
    Mike Bentley
    Model IV-1200
    Jabiru 2200A #438
    Rotec Aerosport LCH Heads
    Ellison EFS-2 Throttle Body
    Prince Prop (64x34)
    My SPOT Page

  5. #5

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    Default Re: Koolprop on jabiru

    I have a model 4-1200 speedster. It weighs 641 empty. My engine is s/n 204 which is the oldest version with 572 hours.
    The top speed yesterday was 105 indicated level flight 3150 rpm it was a little bumpy so I didn't hold it there long. Could have crept up if I had smooth air.

    Should I pitch for 3300 level flight? I'm new to the adjustable pitch family.

  6. #6
    Senior Member
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    Default Re: Koolprop on jabiru

    Any idea how accurate your ASI is? I did a bunch of math, figuring tip speeds, and then googled tip speed and found this info on the warp drive site.
    http://www.warpdriveprops.com/propspd2.html
    You might be at a better (more efficient) tip speed at the 3150 rpm. Also, if my memory is correct, you have aluminum connecting rods on the earliest engines, later ones are steel. Maybe the lower rpm is less stressful on the engine?? JImChuk

  7. #7
    David McCormick's Avatar
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    Default Re: Koolprop on jabiru

    Did your cylinder head temperature change .
    David McCormick
    Kitfox Classic IV powered by Jabiru 2200
    Based at Jersey Shore, Pa P96

  8. #8

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    Default Re: Koolprop on jabiru

    My cylinder head temps stayed the same. This engine has never had temp problems. It is always around 250 for all four.

    Regardless of what the speed calculator says, this prop is much better than the wood prop that was on it. And I can tweak it as needed. 1200 fpm climb out of a jabiru seems very good to me.

    Greg I agree on the cruise theory. I think 2400 rpm is a good number to keep the engine for long periods of time..

  9. #9
    Senior Member cubtractor's Avatar
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    Default Re: Koolprop on jabiru

    I usually cruise about 2950ish at about 95mph. If memory serves me, WOT is 3250. I'll verify next time I go fly.
    Mike Bentley
    Model IV-1200
    Jabiru 2200A #438
    Rotec Aerosport LCH Heads
    Ellison EFS-2 Throttle Body
    Prince Prop (64x34)
    My SPOT Page

  10. #10
    Senior Member TJay's Avatar
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    Default Re: Koolprop on jabiru

    That is the exact same prop he quoted me. I didn't dare pull the trigger on it because I thought thats way to big, Guess it does work keep flying it and keep posting. I may go that route as well

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