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  1. G

    Surfaces 2.8 - Aircraft design and analysis software

    I fly X-plane 11.35. I also have version 11.53. At version 11.4 or 11.41, they made some major aero improvements which I feel were for the worse. Planes that flew well in 11.35 seem to yaw badly in 11.53. I think Austin Meyer overdid it. I never regarded x-plane and planemaker as a detail design...
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    Cracks found on Challengers

    A g-force meter? Spoken like a true engineer! I love it! I never thought of that. You can never pay too much for peace of mind in my opinion.
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    Cracks found on Challengers

    Just to confirm, the challenger 1 DOES have Rony brackets? It looks like it from my earlier photo... Im guessing its less of an issue because its a lighte aircraft than the Challenger 2?
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    Cracks found on Challengers

    OK, on second look, I think I do see Rony brackets on the Challenger 1... can anyone confirm?
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    Cracks found on Challengers

    Can anyone confirm that the earlier Challenger 1 (Single seat) version is not affected by this Rony bracket issue? The wing struts appear to connect differently to the fuselage than the 2 seater version and I have photos of an actual owner's aircraft with no apparent Rony bracket. Just want to...
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    Any Legal Eagles ultralights in Connecticut

    Ok, thanks. looks like I can get a 36" x 56" cross section rectangular "column" out the door, using the best angle. However, the 13 foot fuselage may force me at a non-optimum angle. Probably will have to test egress as I build....
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    Any Legal Eagles ultralights in Connecticut

    Thats excellent news! One more question, Im considering building this in my basement, which is partially underground. Do you think the welded fuselage will fit thru my Bilco doors? Its about 5 steps up to reach ground level.
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    Any Legal Eagles ultralights in Connecticut

    I used to fly out at 3 wing at Bridgeport until COVID hit and I just.. kind of stopped flying. I never flew into Chester as PIC, the fact that one end was on the side of a hill made me nervous. Im looking at the LSA or even ultralight route because its cheaper. (maybe, lol). I've been making...
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    Any Legal Eagles ultralights in Connecticut

    Hi, Does anyone have this plane available to look at in Connecticut? or nearby. I love this design but am not sure if I will fit in it, 6'3", 200 lbs. I'm afraid my head might hit the underside of the wing. Greg
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    10 Free Lesson FEA

    You definitely need to build confidence in whatever Stress Analysis software you are using. Start with the classic tension on hole-in-plate, apply the correct Kt from theory , and see if your software matches hand calcs. I wouldn't trust the results of software I dont fully understand. That...
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    Derivation of equations used in Roncz spreadsheets

    Hi George For the Piper Warrior, I assumed same wetted area the Cherokee, 4 place given in the article = 601 sq ft. Multiplying by 65 drag counts (the highest value given in the article) equals a flat plate area of 3.907. Other values were 160 hp, prop-eff = .8, Standard density at 0 ft...
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    Derivation of equations used in Roncz spreadsheets

    Ragflyer - aaah, thank you. I will crunch the units later but this makes sense.
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    Derivation of equations used in Roncz spreadsheets

    Hi All, I downloaded the Roncz spreadsheet from Duncan's RTFM-aero website and the accompanying scanned Sport Aviation articles from 1990/1991. The second article, March1990, last page, says "equations used in the spreadsheets" shows how he got MAX SPEED = (348.642*horsepower*prop...
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