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timwarlick(at)mchsi.com
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 Posted: Sun Jun 14, 2009 1:12 pm Post subject: BMW Kolb update |
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I am 2.5 hours short of FINALLY reaching 40 hours on my BMW R100 powered Kolb Mark 3 Classic. Although my initial flight was December 2004; work (Teledyne Continental Motors), family (last of 7 kids is finally heading off to college this fall), other hobby (am building a BMW K1200 powered 3 wheeled on-highway vehicle), and weather (always seems to be a 15 kts crosswind at airport) have limited my flight time each year.
Since April, the engine has been working perfect and I have obtained 7 hours of flight time 1 hour at a time. The last problem early this year was the Bing carburetor needle clip breaking during flight. I now have new needles with the o-ring back-up. For those who don't want to check my lD posts, I have a 93 BMW R100 motorcycle engine mated to a Rotax gear drive assembly with a 3 blade, 68 inch Power Fin prop. Apparently, everyone on the ground can hear that prop several miles away. I have struggled with engine performance being less than desired so two years ago, added the BMW sport camshaft and milled the heads to increase the compression ratio to 9.5:1. The engine should have around 68 BHP at 6800 RPM. Aircraft performance is still marginal.
The airplane takes off immediately but climbs slow (500 ft/min) at 6500 RPM with fuel system set-up to best power (1350 to 1425 deg F EGT). Cruise speed is 55 to 60 MPH. The BMW loves to run at 6000 RPM with EGT's at 1370 and 1380 deg F, 345 deg F CHT, and 190 to 200 deg F oil temp. I have an external oil cooler and run Mobile 1 synthetic oil. I have completed filling out all my basic aircraft performance data (stall speeds, best angle of climb, etc). Fuel consumption is around 3.3 GPH. I take a 5 gallon gas can with me each time I head for the airport. I fly out of Fairhope, AL airport which has a paved runway long enough for some big jets. Last week I landed at my first grass strip and have started practice landing in the grass next to the main runway at Fairhope.
Flew today for 1.3 hours along the Mobile Bay. It always amazes me how smooth it is along the edge of the water but when I go inland, the thermals from the various fields and buildings can make for a bumpy ride. I will most likely be at Oshkosh again this year but without my Kolb. I normally have to work at the Teledyne tent some and this year we will be promoting the 94UL unleaded Avgas that I have been developing (visit our new web site www.genuinecontinental.aero/ and go the Advanced technologies area). Those that attend Oshkosh, feel free to ask for me.
Tim Warlick
Mobile, Al
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| | - 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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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Sun Jun 14, 2009 5:53 pm Post subject: Re: BMW Kolb update |
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| timwarlick(at)mchsi.com wrote: | | For those who don't want to check my lD posts, I have a 93 BMW R100 motorcycle engine mated to a Rotax gear drive assembly with a 3 blade, 68 inch Power Fin prop. Apparently, everyone on the ground can hear that prop several miles away. |
Yeah the powerfin is pretty loud, I figure it's because of the squared off tips. Every one I've had (I'm on my 3rd one now) has been deafening.
No better pusher on the market tho. I love mine....
LS
| | - 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:
http://www.matronics.com/Navigator?Kolb-List |
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LS
Titan II SS |
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