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John Bickham
Joined: 10 Jan 2006
Posts: 170
Location: St. Francisville, LA
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 Posted: Fri Nov 17, 2006 5:30 am Post subject: John/Jim Hauck fuel tank design for a Mark III |
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Started a new topic since original thread was for FS tanks.
Don't have answers to Pat Ladd's questions. Answers come with testing and actual flight hours. Wonderful thing this "Experimental Category" here in the US. I've owned a "certified" aircraft (C-172). A&P's are OK but can take the fun out of flying real fast.
Here are my attempts to address the issues and questions.
I assume that it is the black filler tube
showing at top right. Does it lead to somewhere else when the engine is
installed?. From the pic it looks as though it might be pretty difficult to
get at.
I have a filler cap installed about midway on the right side of the gap seal. That is why the filler neck is pointed rearward. Same as the old system I had. No problem filling from the rear. Just take a few minutes to bladder drain and walk around to minimize the exposure to the hot exhaust pipes of the 912. They have a way of getting me just looking at the engine close. However, my new gear legs and 8.00 tires will raise the height of the plane a good 10". Might be a little more reach.
What did it do to your C of G? It would seem that it must move backwards
quite a bit from the original configuration of tanks laying athwartships (as
it were) right at the front of the cage
Won't have the answer to this one till I re-assemeble and do a new W&B at differnet fuel levels. I did have some anxiety/concerns about this and one of the reasons I didn't go to a bigger tank in the original build. But I have flown with some of the more experienced XC Kolbers (best time I ever had) and they have all installed similar and even bigger tanks with no adverse CG problems. One thing I did do, was to weld a small tube brace at the rearward location of the original tanks to move some of the load weight forward. Not an engineer but should distribute some of the load off the rear tubes. See picture for detail.
In my limited experience with planes everything is about arriving at the best compromise. Strength of materials vs weight, good cruise speed vs low stall speed, etc. You never get the perfect plane that has it all. You pick the options that are important. This is my best attempt at a Mark III that is capable of long XC's and have some decent space for gear storage. As pointed out and demonstrated by John Hauck.
Hope this is helpful.
Sorry for the typos and spelling. Just off working dog shift.
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Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
I know many pilots and a few true aviators. There is a distinct difference that I have the greatest respect for. |
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pj.ladd(at)btinternet.com
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| Posted: Fri Nov 17, 2006 7:22 am Post subject: John/Jim Hauck fuel tank design for a Mark III |
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re-assemeble and do a new W&B at differnet fuel levels>>
Should prove interesting. Thanks John.
I understand that Kolb are now shipping the Mark3 with a slightly taller
tank with but the same footprint. This will put the total fuel carried up a
bit, but I suspect not to the extent of your tank Might help someone who
does not want to cut the support tubes about.
Cheers
Pat
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