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Charlie Mike
Joined: 06 May 2021
Posts: 25
Location: West coast
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 Posted: Tue Jun 29, 2021 1:30 pm Post subject: Oh crud.. |
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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: 1671
Location: Blountville, Tennessee
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| Posted: Tue Jun 29, 2021 5:35 pm Post subject: Re: Oh crud.. |
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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.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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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
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| Posted: Wed Jun 30, 2021 7:13 am Post subject: Re: Oh crud.. |
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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….
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Kolb Slingshot 582, C gearbox. |
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