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Old 12-22-2017, 01:55 PM   #11
avidflyer
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Default Re: Koolprop on jabiru

RPM = HP as well, so there is that consideration as well. What did the prop cost you? JImChuk
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Old 12-22-2017, 03:14 PM   #12
Shane Alley
 
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Default Re: Koolprop on jabiru

It was 1050 shipped
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Old 12-22-2017, 03:20 PM   #13
Danzer1
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Default Re: Koolprop on jabiru

Quote:
Originally Posted by avidflyer View Post
Fourth paragraph says that best performance is at or below 700 fps or 475 mph. At 3150 rpm, your prop tip speed is 628 mph. I think our Jabirus are in need of a gearbox to be most efficient. Nobody wants the extra weight or complexity though. JImChuk
That also says at cruise - so if you're cruising at 3150 it's high. If you cruise at 2400 or so you're pretty close! I'm not a Jabiru guy so FWIW!

Greg
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Old 12-22-2017, 03:22 PM   #14
David McCormick
 
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Default Re: Koolprop on jabiru

Did your cylinder head temperature change .
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Old 12-22-2017, 03:46 PM   #15
Shane Alley
 
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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..
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Old 12-24-2017, 08:55 AM   #16
cubtractor
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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.
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Old 01-04-2018, 05:14 PM   #17
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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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Old 01-11-2018, 12:36 PM   #18
Shane Alley
 
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Default Re: Koolprop on jabiru

Got a chance to go flying today. Prop is performing well. Still trying to relearn my landing approach angles due to the increased drag at idle.
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Old 01-11-2018, 12:52 PM   #19
Shane Alley
 
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Default Re: Koolprop on jabiru

Level flight
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Old 04-18-2018, 11:03 AM   #20
Drowosek
 
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Default Re: Koolprop on jabiru

Our propeller is 1620 mm in diameter on the Jabiru.
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