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Byang 0
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Byang 0
Hello all!
I've been talking with a welding buddy of mine about possibly fabricating the conical engine mount per plans. On the plans it looked like some of the tubing used are custom bent, and after cross-checking with cozy girrrl's website this does indeed appear to be the case. My question is that would the structural integrity of the engine mount be affected if the curved sections were replaced with straight sections, and would it be a good idea to fabricate the engine mount ourselves in the first place, given the proper tools, jigging, and experience is available. Appreciate the help!
-Ben Y. -
Marc Zeitlin 135
3 hours ago, hdmx said:@Marc Zeitlin strongly disagree with your arguments here. The originals plans did not specify really a lot of properties for the foam so most of it is unaccounted for. Deviating from the plans do not make it unsafe per se. I am deviating from the plans a lot, might be able to post my progress next year and you'll see...
When you find the design specifications for the Varieze, Long-EZ, or COZY MKIV aircraft so that you can determine whether or not the materials you're using meet those requirements (and sometimes, the reason for choosing a certain material is not the published specification for it), please let us knows how the specified material and the material you've chosen both match up against those design specifications (requirements).
Many people have changed the structure from the plans. Most have been fine doing so. Some have very much NOT been fine doing so.
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hdmx 2
@Marc Zeitlin strongly disagree with your arguments here. The originals plans did not specify really a lot of properties for the foam so most of it is unaccounted for. Deviating from the plans do not make it unsafe per se. I am deviating from the plans a lot, might be able to post my progress next year and you'll see
I wouldn't compare it like "aluminium vs plywood", more like "aluminium alloy A vs aluminium alloy B" - slightly different properties and after proper evaluation it might be possible to use the alloy with better availability. If the important properties are the same or better, I do not see any problems using different materials. I've looked at the physical properties of the XPS PIB which is sold by ACS - it's got less density as well as lower compressive strength and tensile strength. From the data I was able to gather, the pink Jackodur KF 300 is equal or better in terms of skin buckling, denting, and overall strength than ACS foam and only has a problem with delamination as a result of its smooth surface. Unfortunately I do not have access to a laboratory anymore - I used to conduct tests determining the properties of sandwich structures used in formula race cars. Maybe I can call and see if they check out a few test panels so we get some actual measurement data
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Kent Ashton 382
I see that Mr. hdmx is in Germany. Maybe this is something you can use. I didn't look at the specs
https://www.easycomposites.eu/xps-extruded-polystyrene-foam
I have played with the home-store insulation foam but found it as hdmx describes: not good for homebuilding. If I lived in Germany, I would call up the Germany glider manufacturers and see where they get their foams. Post something if you find anything useful.
Edited by Kent Ashton
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