Building Tips and technical articles. > Building techniques
Home made ajustable leading edge slot cutter
Tom Perry:
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^
Steve Helmick:
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
minnesotamodeler:
Very slick notching system. Didn't realize Tom was asking for a critique of the concept of notching.
Thank you, Tom.
--Ray
Dennis Moritz:
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.
Tom Perry:
--- Quote from: minnesotamodeler on November 04, 2006, 01:45:18 AM ---Very slick notching system. Didn't realize Tom was asking for a critique of the concept of notching.
Thank you, Tom.
--Ray
--- End quote ---
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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