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  1. A

    Small single seat aircraft fuel consumption, help to understand

    Listen to a podcast interview with a guy who got shut out of his primary and alternate in Wisconsin. He drained his high Wing tank dry on the intercept turn and managed to switch over and put it down in 0/0 conditions on the Runway of the third alternate, using his altimeter, which he knew to be...
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    Engine failure turn back.

    Yeah. The tailwind vs headwind thing is covered in that last vid I linked to. Basically your speed at impact has a lot to do with survivability. So there is a lot to be said for just landing straight ahead.
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    Engine failure turn back.

    Not to drift too far, but this flight training warbird thing has me thinking the big players are just trying to push everyone else out of aviation altogether. One hopes the Biden FAA will adopt a more reasonable interpretation, but it is probably not too early for us all to be writing letters to...
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    Engine failure turn back.

    I thought this guy had a lot insightful things to say:
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    Engine failure turn back.

    Using the plane seems like one of the more important variables. Things that get used also get maintained better. I was just hoping to get a sense as a consumer of how to approach finding a mechanic and evaluating what they are doing and not doing. It is hard to tell who is going to be...
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    Engine failure turn back.

    Yes I was shooting from the hip trying to remember the stats in the earlier post. But you have to agree that it is sort of the opposite of what we might expect if engine rebuilds were actually as good as people seem to think for engine longevity.
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    Engine failure turn back.

    I think the idea came from Mike Busch: Do Piston Engine TBOs Make Sense? | Apparently it is not within the first 10 hours, but within 0-499. To quote from the link: What Dr. Ulrich’s research demonstrates unequivocally is striking and disturbing frequency of “infant-mortality” engine-failure...
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    Engine failure turn back.

    Interesting, but what is behind this? Mechanics not looking or owners refusing to pay? It isnt like there is usually a discussion like "this is the cheap annual, this is the medium annual, and this is the annual if you really don't want anything to fail? And what about most engine failures...
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    Engine failure turn back.

    Or even post 89. Which was mine. Anyway I think AOPA should have referenced the other effort in their vid and done that process instead of testing three or four random planes, drawing firm conclusions and posting it as some sort of authoritative analysis.
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    Engine failure turn back.

    The EAA webinar video takes a far more sophisticated approach to the issue. Nowhere in the AOPA video does it state for instance that the reason the cub makes it back is because it has 150hp and therefore climbs much more vertically than it glides. Nor do they point out the eaa effort or the...
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    Load testing for unknown wing.

    No worries. I would not expect that. I am also a poser. I just thought people with actual experience might have done wing skin buckling calcs before. Seems like that is true, which is cool.
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    Fastest planes on the least amount of HP

    Yes it would, but nobody here cares about those planes.
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    Load testing for unknown wing.

    That makes sense. But in order to know what limit load is, it makes sense to figure out what load the design scantlings suggest it should support at ultimate. I find it hard to believe that the limit load is 10G, because that would put ultimate at 15G. And no one can really even tolerate 10g to...
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    Fastest planes on the least amount of HP

    Perhaps speed per horsepower per person?
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    Fastest planes on the least amount of HP

    It doesnt make much sense to have this discussion about efficiency without controlling for gross weight, as the fai does already.
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    Fastest planes on the least amount of HP

    Anequim went 323mph with a 220hp 0-360. Should be in the fai data above.
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    Load testing for unknown wing.

    I think modeling the skin as a thin cylinder is problematic. The part of the skin contributing most to bending resistance is the thickest part of the wing, because it is furthest from the common centroid. That part is pretty flat. All those cylinder calculations get pretty wonky if the shell is...
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    Load testing for unknown wing.

    Or just get it from XFOIL "BEND" .GDES c> XFOIL c> bend Area = 178.19264 Slen = 97.633995 X-bending parameters: centroid Xc = 20.680401 max X-Xc = 27.319599 min X-Xc = -20.680401 solid Iyy = 22250.422 skin Iyy/t = 20108.883 solid...
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    Load testing for unknown wing.

    The wings are already built.
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    Load testing for unknown wing.

    I have done a fair bit of composite work, but this plane is wood. Wing is wood truss ribs with plywood skins, single strut. Problem is a bit of increased span and increase in gross weight from 1450 to 1750 along with a large speed increase from perhaps 200 to 270mph on the same spars. On the...
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