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dhkey(at)msn.com
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 Posted: Tue Mar 07, 2006 9:06 pm Post subject: Kolb Twin |
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Whatever happened to the twin engine Kolb?
http://www.recpower.com/KOLB-1f.jpg
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Dave Bigelow
Joined: 29 Jan 2006
Posts: 103
Location: Kamuela, Hawaii
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flyingfox(at)copper.net
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Dave Bigelow
Joined: 29 Jan 2006
Posts: 103
Location: Kamuela, Hawaii
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| Posted: Fri Mar 10, 2006 1:54 am Post subject: Re: Kolb Twin |
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There is a crop duster (forget the name) that has a similar setup in a tractor configuration - it was successful. The props rotate in the same direction, but are moving in opposite directions across the overlap area. I made the mounts quite beefy. The engines are 17 inches off the center line of the aircraft, so the twisting moment during single engine operation should not be too high. Each engine should produce about 180 lb of thrust at sea level.
The plan is to do static full power runup in all engine configurations with video of the mount areas before test flying. Won't know for sure until I try it out. That's a big part of the challenge (and fun) of this sport. The airframe is fully tuned out with about 50 hours of time with a 503 pushing it. I will have to do another weight and balance before flying it with the twins.
The biggest suspected potential problem is vibration. I've used slightly different spacing between the mounts on each engine to help prevent harmonics, but I'm pretty sure there will be an RPM range that will need to be avoided. Time will tell!
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Dave Bigelow
Kamuela, Hawaii
FS2, HKS 700E |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Fri Mar 10, 2006 6:25 am Post subject: Kolb Twin |
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| The plan is to do static full power runup in all engine
configurations with video of the mount areas before test flying.
| Dave Bigelow
Dave:
A friend of mine, during testing of his Suzuki powered 3/4 scale
Jenny, used a strobe light at night on the prop. Amazing what the
strobe uncovered. At certain rpm the prop blades were dancing in all
directions and configurations. This may proved to be a critical
element of your test program. I don't know how he had the strobe
configured, but could find out if you are interested.
john h
MKIII
| | - 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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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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