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Thread: True ultralights?

  1. #136
    Registered User vtul's Avatar
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    Re: True ultralights?

    Hmm....... the Skypup outer panels are 12' -- make 4 of those.... (no centr section) and you've got a bipe of about the same area as the Bloop's, and about the same span......

  2. #137
    Registered User vtul's Avatar
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    Re: True ultralights?

    They're designed as cantilever panels, with all fittings drawn. But panel loading actually drops since there are 4, instead of 2 panels and an 8' center panel on th Skypup.......

  3. #138
    Registered User vtul's Avatar
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    Re: True ultralights?

    Matthew, me no fly in winter. Fun, not torture.

    Greatly admire hivonoch though, BTW his plane was featured in one of the very early Skypup Newsletters in the 80's. I'm certain that's the same one. Still flying after 30 years.

  4. #139
    Registered User vtul's Avatar
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    Re: True ultralights?

    Here it is Matthew from Skypup News October 1986. And he used a, wait for it..............

    14HP motor!!

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  6. #140
    Registered User cluttonfred's Avatar
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    Re: True ultralights?

    Quote Originally Posted by vtul View Post
    Hmm....... the Skypup outer panels are 12' -- make 4 of those.... (no centr section) and you've got a bipe of about the same area as the Bloop's, and about the same span......
    Ahh, but you need to choose...build, design or fly?
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  7. #141
    Registered User Tiger Tim's Avatar
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    Re: True ultralights?

    Quote Originally Posted by vtul View Post
    me no fly in winter. Fun, not torture.
    C'mon, live a little. Don't knock it until you've tried it, cold days are often fantastic for flying.

  8. #142
    Registered User BBerson's Avatar
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    Re: True ultralights?

    Finger joint gussets are easy to weld over any questioned joint. It doesn't take much to get a weld strong enough since tubes fail in buckling before the weld would break usually. I think brazing is less easy than welding and can't be welded over later.

  9. #143
    Registered User blane.c's Avatar
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    Re: True ultralights?

    Quote Originally Posted by BBerson View Post
    Finger joint gussets are easy to weld over any questioned joint. It doesn't take much to get a weld strong enough since tubes fail in buckling before the weld would break usually. I think brazing is less easy than welding and can't be welded over later.
    No question you are not going to weld over a brazed area. Brazing is different than welding, I wouldn't say less easy, it does take more patience and time to make and fit up all the finger gussets. After practising on a few pieces knowing when you are getting good capillary action will be self evident and at that point you can braze up a storm. Not everyone will have confidence in welding and brazing is an alternative that will work for many.

  10. #144
    Registered User vtul's Avatar
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    Re: True ultralights?

    I guess the problem for me is trust, re. welding and brazing. Seems to me that a bad joint can look to me like a good joint and with hundreds of them, how do you know if you screwed one up?

    I don't mean that I can't weld or braze at all. But with life in such delicate balance over every aspect of construction, it's different than say welding on my tractor, or even making a model steam engine.

    Okay, here's one, brazed, that I made out of all cast iron pipe fittings, steel pipe, and nails, using hand tools. The piston was a pipe cap, the flywheel brazed together pipe sections, the crankcase a pipe cap, the cylinder a connector brazed to the base, the head and all flat stock from hammered flat pieces of pipe, cam from a pipe plug. Valve, crankshaft, and con rod were nails with brazed pieces. Cam operated inlet and uniflow exhaust. Ran on 50 lbs and sounded like a two cycle. But nobody's life depended on it.


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  11. #145
    Registered User vtul's Avatar
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    Re: True ultralights?

    Quote Originally Posted by Tiger Tim View Post
    C'mon, live a little. Don't knock it until you've tried it, cold days are often fantastic for flying.
    Tiger I wish I enjoyed the cold, but I don't. My daughter loves it, but she didn't get that from me!

  12. #146
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    Re: True ultralights?

    Essentially practice weld something together and then destroy it with a hammer. If the welds dont break, its not going to in the air. It is about how good you can watch metal melt. You get both sides melting without caving in, add some welding rod, let dry. If both sides are not melting, you are not welding.

  13. #147
    Registered User Rockiedog2's Avatar
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    Re: True ultralights?

    Quote Originally Posted by TFF View Post
    Essentially practice weld something together and then destroy it with a hammer. If the welds dont break, its not going to in the air. It is about how good you can watch metal melt. You get both sides melting without caving in, add some welding rod, let dry. If both sides are not melting, you are not welding.
    That's what my final analysis has been when looking at a weld that I did but don't quite like...could I tear that up with a ball peen hammer? so far the answer has always been naw it'll be ok and so far that's always been right. yeah I know, long term vibes are diff than a hammer and anvil. It doesn't have to be perfect but that's what we should shoot for. no worries here.

  14. #148
    Registered User Tiger Tim's Avatar
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    Re: True ultralights?

    Quote Originally Posted by vtul View Post
    Tiger I wish I enjoyed the cold, but I don't. My daughter loves it, but she didn't get that from me!
    I don't like the cold either but I find open cockpit airplanes to be wonderfully distracting. Beautiful steam engine you built, BTW. If you're capable of that I bet you could pick up airplane welding pretty quick.

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