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  1. V

    Long term integrety of Epoxy

    Also, glossy absorbs less than flat finish. Finish can make a bigger difference than color. As mentioned previously, some special pigments have differential emissivity. They absorb thermal radiation like a lighter color but emit (radiate) longer wavelength more like a darker color. This...
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    Peter Stripol is at it again...

    Peter Von Raptor
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    Peter Stripol is at it again...

    You can probably save your breath. He'd listen to: 1) A sponsor with a pile of money to give him or 2) A proven social media star with more followers than he has. It sounds like he may not be interested in taking advice from regular old pilots or regular old folks with expertise on...
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    Peter Stripol is at it again...

    Also, would the foam in these spanwise ribs ever be loaded in tension? Even a little? I haven't run across specs for the tensile strength of EPS and XPS, but the beads in EPS are just looking for an excuse to jump apart from each other, at least in the home improvement store variety I've used...
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    Peter Stripol is at it again...

    Adhesive could be spread on the foam, plywood placed on top and wrapped around the leading edge, and vacuum applied to get a good bond (just as we might do with a solid core). In addition, the spanwise channels might be good plenums during vacuum bagging. By perforating the main core from...
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    There is a new V-Twin on the market - DuroMax 713cc

    Are you still thinking of hopping up whatever engine you get? If so, take a careful look at the Honda. There are some advantages to their one piece head-and-cylinder design, but access to the head internals/combustion chamber is tougher.
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    Peter Stripol is at it again...

    Yes. As VB mentioned earlier, it is possible/likely that the analysis and engineering going on is more extensive than Peter shows. This analysis could be Peter's or his associates'/friends'. It would be interesting if, before the build video, we could see any work or even TLAR that went into...
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    Peter Stripol is at it again...

    Maybe that was a different plane, or a different video? In the video on Post 31, he loaded sandbags until he got to 2.5G (approx 10:30 in that video) In the video in the OP, he loaded sandbags until he got to a little less than 4 Gs (approx 5:50 in that video) Also, with the minimalist skin...
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    Peter Stripol is at it again...

    That's why we are comparing foam types. Input?
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    Peter Stripol is at it again...

    Some is, some ain't. 1) Yes, the most readily available (in home improvement stores, etc) EPS has a lower density than the most commonly available XPS 2) XPS is stronger than EPS of (almost) equivalent weight: ..........................Density.........compressive...
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    Peter Stripol is at it again...

    I just noticed--it sure looks like he's using expanded polystyrene (EPS, aka "beadboard") foam for the wing core in this previous design. I sure can't see why he'd use that rather than extruded polystyrene (XPS).
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    Peter Stripol is at it again...

    Here's a video of him cutting the wings foam for a previous airplane of his (this one with poplar trusses) (1:20 through 2:05) He used thin plywood templates (cut with ajigsaw?) on each end of the 42" long sections and cut them solo using a hot wire on a PVC frame/bow. Looks like he fed the...
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    Metal tube joint basics

    No, but many attribute to Stalin a quote expressing a related sentiment: "Quantity has a quality all its own." This attribution is disputed. But during the Cold War it certainly seemed, to many, to be a key chracteristic of Soviet military materiel procurement. "The F-4 is a better plane...
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    Verner Anounced suspensoin of production for 3V and 5V radials

    The weight isn't clear on the factory spec page. "Product weight" is listed as 35 kg (77 lbs). 45 hp from a 4 stroke air cooled 800cc engine at 3800 rpm is .. . ummm, well, maybe it is just intended as an estimate. They are recommending high octane fuel, so maybe they are running high CR and...
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    Extending intake on a composite cowling

    Would some rubber flashing do the trick? My local Rural King sells rubber that is meant for making/repairing farm conveyor belts, it is sturdy stuff and they sell it by the foot. Or get some stiff weatherstripping rubber. Test whatever you get for heat tolerance. If there's a way to rivet it...
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