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Oh crud..

 
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Charlie Mike



Joined: 06 May 2021
Posts: 25
Location: West coast

PostPosted: Tue Jun 29, 2021 1:30 pm    Post subject: Oh crud.. Reply with quote

Not sure what happened, but I had a prop strike on start up. Prop hit the aileron control arm and snapped! I had started it 3-4 times earlier. Taxied around, all was fine. I was installing a better tach. Went to start it, and bam. God slapped.
I removed the prop. Gear box/hub looks good, but I think there is an air leak now, in a seal. As it warms up, the rpm’s climb way up, with throttle at idle.
Prop was tight. Rpm’s were at starter speed. I don’t get it?


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Kolb Slingshot 582, C gearbox.
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Richard Pike



Joined: 09 Jan 2006
Posts: 1649
Location: Blountville, Tennessee

PostPosted: Tue Jun 29, 2021 5:35 pm    Post subject: Re: Oh crud.. Reply with quote

What brand of prop? Ivo's are known for massive flex/flap during startup & before the engine smooths out, and a hub extension is mandatory. Stiffer props are safer w/o an extension. But check anyway.
One of the locals had a T-Bird with a 3 blade Ivo on it, no extension, similar results. The Rotax roughness at initial start/gearbox chatter makes the Ivoprop really flap.
TL,DR, flex your prop as far as it can go and then add a bit more. If that doesn't readily clear your hardware, you need a prop extension.


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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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Charlie Mike



Joined: 06 May 2021
Posts: 25
Location: West coast

PostPosted: Wed Jun 30, 2021 7:13 am    Post subject: Re: Oh crud.. Reply with quote

Thanks Richard. The prop was a Kool prop. Identical to Luga prop. Company in Canada. They are very light weight, hollow cf. The company seems to specialize in paramotors……
I’m calling Whirlwind this morning….


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