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  1. I

    Painting with latex house paint

    I agree, it concerns me also. We know the action on the top leading edge of a wing, in vacuum, is significant and dynamic. So I am likely going to tape it there well, then encapsulate another taped layer around the painted LE to have the entire wing in mylar. I could use fibered strapping tape...
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    Painting with latex house paint

    "I would never be happy with that mylar unless I had some way of shrinking it or mechanically tensioning it. " Sorry, I meant that my 24" wide sample is not rigged with bracing in a way to tension the mylar with heat. The wing will certainly be tensioned with heat and flat, not as per my sample...
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    Painting with latex house paint

    OK, so exterior worked for you. I know people refer to 'housepainting' aircraft so much, I just didn't know. My wing section (pictured) will be using 0.9mm 2 ply birch veneer on the LE. The LE may end up with tensioned mylar as well, or if painted well, it will just be bare. I am using certain...
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    Painting with latex house paint

    Some questions on latex housepaint for AC: 1) Can we go full gloss? In my housepainting experience full latex tends to be more cohesive than adhesive, and balls up, so I typically use eggshell, but for aircraft I prefer full gloss if it's OK 2) Can we use interior latex? The aircraft doesn't...
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    Straight edge ideas

    Ok, I'll go for that plan, sign me up. Anyhow, I appreciate the discussion, I ordered a misumi set below, 8' each, 2x, I'll machine fixtures to run on the channels, and to join the two. I get a system that sits with my wood with little space, light, and sufficient for the task.
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    Strength of wood vs thickness

    OK, meaningful insight. Heck if ply was flexible they could ship it by the roll. Partially true... They machine and handle identically, but Acetal is about 20% weaker tensile, and has the issue of void formations. Only once did I see a void the size of rice in a 1/2 part, one difference...
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    Strength of wood vs thickness

    "but no one seems to document any issues of correction for size of sample. " exactly! Even Acetal plastic has a voids spec that Delrin does not. Materials sometimes have dependencies on thickness. Especially a low resolution randomized stock like wood.
  8. I

    Strength of wood vs thickness

    OK, so we can say something like "Above 3mm thickness many applications for planed board exist" Is about 3mm the thinnest use for any non-ply? Obviously I can get in trouble with ambiguity depending if it's a critical or non part, but I try to frame my understanding around broad principles...
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    Strength of wood vs thickness

    I find occasionally in reading old plans, that they may call for 1/8" birch for example for a gusset, whatever it may be. Just trying to learn, is there a test regimen or chart that demonstrates that wood loses strength greatly past a certain thickness? I understand thin plywoods, their solving...
  10. I

    Straight edge ideas

    Thx for the suggestions. I do run a self levelling green laser. Today added one PVC shim to table (leg was 5mm short, far side, middle leg of pict.), now the whole pair of tables is within 2mm with very little work, still going to make an 80-20 system to control both axis' of the ribs I make. I...
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    Straight edge ideas

    Little Scrapper had a pretty good thread a while back on building a table. Yep, saw his with trusses and MDF on top, looks like a good design for light stuff. His build link is no longer, but thanks.
  12. I

    Straight edge ideas

    What kind of tolerance of you really need? Wing spars, a sandwich of wood over foam, for a part 103. I would say within 1/4" will be OK, There will be dual struts with capability of fine tuning those for twist, etc. Maybe I am overthinking the accuracy a bit. I lined up the tables 40"x16'...
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    Straight edge ideas

    So I need a straightedge of about 15' long to build some wing spars. I use and trust extrusions like 80-20, Misumi, kinda easy to make a jig for that and they are very straight. At work I have a 1"x2" 25' beam of 80-20 is not stiff enough to define any straightness, on it's own, not at all, so...
  14. I

    Cheap ultralight wing coverings

    He seems to be enjoying it :) It works for short term, but UV resistance of 'rubber adhesive' tapes is very low. Somehow, even though the film itself blocks most UV, they still turn yellow and jump off, like an old box left to sit near light.
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    Cheap ultralight wing coverings

    Back to the topic. Tedlar is available in 0.001" now. I would just avoid speaking to the one vendor about anything aviation related, 'you are building a plant greenhouse for plants' Tedlar sale has been restricted in past. Add Polyester 'floor covering tape',combined with double sided tape...
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    Use of Kydex or Formica as leading edge of wing

    So I looking for an different leading edge material for the wings, for a Part 103. I expect to use Tedlar (or regions of mylar) for all surface coverings, except the leading edge. Has anyone made a kydex LE? Kydex: I have a 0.020" sample coming in: The plan is to make 24" long pieces, with a...
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    EPS blue foam question regarding fuel

    Your replies are helpful. I plan on using bluefoam, as a fiberglass composite for tailfeathers & ailerons. I may also at some point do some nose cowling areas, etc. Structure is riveted aluminum primarily, it won't be a full foam airplane. But, the curiosity and risk assessment are still valid...
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    EPS blue foam question regarding fuel

    Hi, I searched and did not find the answer I seek: When building composites with 2 layers of fiberglass and epoxy over blue foam insulation board EPS (department store variety), how is the lifecycle of the fuse, wing, etc if exposed to exhaust from the engine which contains unburnt...
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