I know somewhere I've seen a drawing of the clearance hole required in the boot cowl for the shock struts. I've done a search and looked through the engineering changes, checked the plans and the build manual etc but can't find it. Can someone point me in the right direction?
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Shock Strut clearance holes
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Is this it? I recently uodated that page with some nice additions by Bruce.
If you have any trouble accessing it, let me know and I'll email a pdf.
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The drawing are posted on Bearhawk Tips: https://bearhawk.tips/772
I also used these sealing plates for my landing gear. Unfortunately I did this after I was already flying. It would have been better if I had incorporated these when I was building. It is just more difficult as an after thought.
During the build, I made the oleo strut openings way too large initially, and did not seal them very well. As a result, I experienced a LOT of carbon monoxide infiltrating the cabin while in flight. So much so, my CO detector (https://www.thinairenergy.com/geiger-co) was going nuts! My eyes were stinging and I was getting pretty woozy. Not good!
I ended up installing Bruce's covers and made the seals from a heavy duty tractor tire inner tube. One on the inside, and another on the outside. I also made small AL fairings to push exhaust down and away from the openings. My CO detector is much happier and my brain is working again in flight!
All joking aside, this is a pretty big deal! One can into real trouble if exhaust is finding its way into the cabin. My advice is, make sure you get this area built right and COMPLETELY sealed up!Rob Caldwell
Lake Norman Airpark (14A), North Carolina
EAA Chapter 309
Model B Quick Build Kit Serial # 11B-24B / 25B
YouTube Channel: http://bearhawklife.video
1st Flight May 18, 2021
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Thanks for that comment! I will definitely make sure this is sealed up. Now if only I didn't have to pay $90.00 to get a look at that drawing. I guess I'll reinvent the wheel!
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Mark, try to refresh the page and see if it will let you view it. I have made a change on my end so that you can see it based on your access to the kit builder manual.
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The Beartracks are kind of an extension of the plans. The first five years are consolidated into a book which is included with the plans, and this covers many of the more fundamental details. Over the years there have been several other ways to do things that builders have come up with, and shared in various venues. Skipping the classified ads and just printing the content would exceed 125 pages, some of which is flying stories, and some of which is techniques and building information. The article in question is from 2006. I have not yet had anyone come back after purchasing the Beartracks archive to say that they didn't get their money's worth.
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