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  1. W

    Sitka spruce substitute

    There are quite a few ways of doing things on offer here, each way having its own special attributes! - I would prefer to use steel tube - I can weld, but can I weld well enough? - that is the question! I have seen some people here in the past, telling guys to weld (and learn to weld) on an...
  2. W

    how to weld 4130

    In your example, I guess there is no Legal right to stop him of course, but so far as I'm concerned there is a Moral right which would certainly come before any laws or philosophical arguments ! (and this is something which is ingrained in (most) of us).
  3. W

    Crashes in the News - Thread

    Hopefully I'm not intruding too much,- but the trouble with human beings is that although they may have a head full of knowledge of what to do and what not to do (through reading everything up thoroughly), when a bad situation actually arises, the mind may fail to recognize it till it is too...
  4. W

    how to weld 4130

    What worries me a lot is that I notice that many people on this forum ask about how to weld Hi Tensile tube and many of the people asking seem to be learning to weld from scratch on an aircraft project! - how can this be? at least, how can it be possible to be allowed to get an aircraft in the...
  5. W

    Ladder Type Wing Construction.

    I haven't studied the Affordaplane wing to any great extent (but will do if I can find the details) - but "ladder construction" of wings all seems to me to be riding on the edge of disaster just for the sake of a quick and cheap solution. However, having said that, I've got to admit that there...
  6. W

    Warren Truss Wing?

    Not many people realise that the British Wellington twin engined bomber, designed in the thirties, was full geodedic construction and was able to sustain massive amounts of damage and still get home, which is why it was used through the whole of WW2, - (one was raised recently from Loch Ness in...
  7. W

    Ladder Type Wing Construction.

    Many of these lighter aircraft have wings of ladder type construction and seemingly rely on the fabric covering to take tension loading, - am I right? I would like to know how safe this is, in comparison to built up wings with proper cantilevered beam construction. Would it be better for me to...
  8. W

    Dacron lifespan.

    Thanks David, that sounds simple enough, - hope he doesn't regard me as a "tyre kicker" when I try the jab test!
  9. W

    Dacron lifespan.

    Looking at CGS Hawk ultralight, - it seems that it has been stored for about 8 years. My question is, will the Dacron (I think) covering still be ok? ie considering that down in this part of the world the UV light is very intense at certain times of the year. How can it be tested?
  10. W

    CH701 AVEX rivets

    The idea I think is to get a tight fit in the hole, the tapered part of the rivet head is forced into the hole and the rest of the ( tapered ) head is then curved down and pushed against the top of the skin, this effectively results in the rivet being wedged tightly in the hole as well as the...
  11. W

    Not THAT question AGAIN!

    Having said all that I've said, I am not trying to be the ultimate expert, and what I knew about brazing/ bronze welding came from the sixties and seventies, and I do realise that things have moved on from there. The metals used though are still basically the same, as are the stresses and...
  12. W

    Not THAT question AGAIN!

    They have machines to take the heartache out of it now, they call them "tube notchers" I believe, - don't quote me though ! :)
  13. W

    Not THAT question AGAIN!

    Prepare it right and there won't be any gaps, ( easier said than done of course). ;)
  14. W

    Not THAT question AGAIN!

  15. W

    Not THAT question AGAIN!

    http://www.esabna.com/euweb/oxy_handbook/589oxy14_1.htm Just found this link, haven't read it all but it looks ok. - I did quite a lot of brazing in my younger days and I was very impressed with the finish and strength of the joints. Also having seen that all the successful one off...
  16. W

    Not THAT question AGAIN!

    Had a quick read through all the posts on this thread but I didn't see brazing mentioned, (sometimes referred to bronze welding, braze welding etc.) and done with a torch, - this applies to steel of course. I seem to remember that this technique was used in constructing tubular frames (...
  17. W

    Engine selection - Ultralight

    DANA, I'm amazed, - I think I must have fallen behind the times with two stroke (production engines) development - I thought that 250 BHP/litre would have been confined to out and out racers! I rode motorcycles (my kids did as well) - my motorcycle experiences stopped about 1990, and things...
  18. W

    Engine selection - Ultralight

    I do believe that a 100cc Kawasaki running at 12000 rpm and producing 25BHP is not a sound proposition in any aircraft - reliability is probably the most important thing here, and there certainly wouldn't be much of that! It would be running at it's upper limit, (some might say beyond that !)...
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