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ashontz
Joined: 27 Dec 2006
Posts: 723
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 Posted: Sat Jan 13, 2007 6:55 pm Post subject: Rear wing spar measurement |
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I'm about 1/2 way through bulding my right wing. I made the ribs per the plans measurments (9 seperate center ribs) so I know my ribs are the right size. I see on the plans that it calls for a rear spar with a width of 106mm across the web. The rear of the back end of the center ribs is only 104mm. I decided to make my rear spar at 103.5mm. There's still a small gap top and bottom when the rib is lined up with the rear spar, and will be a tad more with the flaps and aileron hinges. Has anyone else run into this problem? The main spar is 212mm and the front of the center rib is around 218 or a little more, so that measurement in the plans seems to be correct. Does anyone see any problem in making the rear spar at 103.5 or there abouts to fit the rear of the center spar, the rer spar is still about 2 mm over even at 103.5mm. I highly doubt I made a mistake making my center spars because I had to cut 9 different forms per the plans, all 9 them coming out the same dimensions on the rear end, and all 9 of the the front of the center spars seems to be spot on with the dimensions to meet up with the center spar.
Thanks.
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Sat Jan 13, 2007 7:54 pm Post subject: Re: Rear wing spar measurement |
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Thanks. I have the angle correct. It's the fact the if I made a 106mm web it would be over sized by about 3mm, leaving a gap instead of a nice flush joint for the skin to over lap. I'm thinking my ribs may be ever so slightly under sized. I looked my router and where the ballbearing touches the rib former, it's about 5mm from where the router actually does it's deal on the piece I'm routing. considering the 10 degree spring back angle in the form, where the router bearing actually touches the side of the form means that it's cutting off close to an extra 1mm all around (tangeant 10 degrees times, 5mm = .88mm), meaning the form is essentially almost 2mm undersized width and length. Not a major problem in length, but definitely a problem at the small rear end of the final rib.
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Sat Jan 13, 2007 7:57 pm Post subject: Re: Rear wing spar measurement |
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Oh, I'm building a CH601XL with a Corvair engine. Just updated my signature.
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Sun Jan 14, 2007 7:31 am Post subject: Re: Rear wing spar measurement |
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I took a closer look at this ths morning. The spar that I made acutually measures about 104m-105mm (measured in several spots along the 12' foot length). I test clamped the rib to the spar with the rib upside down on the table and clamped a 3 foot by 6in piece of .025 along the top edge. It actually looks pretty good. The clamps (small finger spring clamps from Home Depot) pulled everything together nicely and no warping on the top of the skin was noticed. I think I'm actually good here. I'll post some pix though.
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Sun Jan 14, 2007 4:31 pm Post subject: Re: Rear wing spar measurement |
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Sounds like you have it well in hand. How are the flaps and ailerons going to fit up? Will there be a bigger step? Shimming is an acceptable practice to get things to fit.
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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/ |
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Mon Jan 15, 2007 5:11 am Post subject: Re: Rear wing spar measurement |
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| Ron Lendon wrote: | | Sounds like you have it well in hand. How are the flaps and ailerons going to fit up? Will there be a bigger step? Shimming is an acceptable practice to get things to fit. |
The flaps and ailerons should be ok. I talked with Scott Laughlin, he recommended just making the flaps and ailerons to size per the plans. 2mm tops shouldn't be a problem.
How would you go about making a shim if need be? I was thinking about this if it came to it. I figued if I had to shim for some reason that I'd make an L out of .025 or .040. maybe 20mm wide and afix it to the rib (riveted on the side of the rib) where the gap is, that way I'd fill in the space as well as not have to worry about the shim moving when it came time to drill and rivet the wing skin.
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Mon Jan 15, 2007 2:37 pm Post subject: Re: Rear wing spar measurement |
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With only 1mm per side I was thinking of .040" strips where needed on the rib flange. The rivets through the skin/strip/rib will hold the strips in place.
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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/ |
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