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Building Tips and technical articles. => Building techniques => Topic started by: Tom Perry on November 03, 2006, 07:46:45 PM
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Folks,
Another use for Bull Dog clips and Popcicle Sticks.
This is the leading edge cut for the Maltese Cross Thing in the general forum.
Any questions?
AP^
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I've never seen a convincing reason to put a stress riser in the LE, TE or Spars, but some folks like to predetermine where stuff will break. A small ballpoint pen mark works pretty well and doesn't make a weak spot. I'd consider putting a vertical 1/16" square (one or two) in such a location, or a gusset. The way I see it, if I don't notch these items, I can reduce the size of the LE, Spars, and TE. That should save some weight. The airplane will fly better, and because it flies better, it won't crash as often, tho SH^ ! **) Steve
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Very slick notching system. Didn't realize Tom was asking for a critique of the concept of notching.
Thank you, Tom.
--Ray
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Always possible to hollow out leading edge between ribs and reduce weight some more. Stress risers in bawsa? They seem too fibrous and discontinuous. When ribs are zapped with good cement, seems to me that would be a strong 3/32". Thin CA fanning out into wood surrounding the joint, would definitely add strength. Wings are prone to break right after the sheeting in the center section, in any case. Or in the center, if the trailling edge lets go. Also, those notched leading edges are out of fashion these days. Aren't they. The saw looks good to me. Nice to jig up an even depth. My last notched leading edge was eyeballed. Not as even a job as the one above. By no means.
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Very slick notching system. Didn't realize Tom was asking for a critique of the concept of notching.
Thank you, Tom.
--Ray
And here all this time I thought a dado joint was much stronger than a butt joint what with the extra glue surface and all. I guess a well fitted joint doesn't make up for any potential compression failure on the rear of the leading edge. I imagine thousands of years worth of woodworkers are turning over in their graves. :)!
As the Maltese Cross Thing turned out to have a 9.1 oz. wing loading I thought it turned out to be a snappy little flyer.
Have you seen the last of the flying weather up there yet?
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Tom,
Did you enjoy the Popcicles? :)
Nice job BTW
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Tom,
Did you enjoy the Popcicles? :)
Nice job BTW
I cheated and bought a bag of them down at the dollar store. #^
Just lately though my wife has been buying me sugar free Popsicles and fudgecicles and I don't throw the sticks away.
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Most of my kits with the notched leading edges- Sterling Navion, Flite Streak, Cosmic Wind, etc. broke almost anywhere but at the notches. Clean notches do make for a nice, neat assembly, as long as you get 'em in the right spots.
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Hi Tom,
That is a neat "tool"!
Bill <><