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  1. J

    fuselage welding

    Ok, and i am a PROPERLY qualified welder here in the UK with specific certificates for oxy acetylene welding... In general use, you ALWAYS shut the acetylene off first. The reason is that when you shut the acetylene off first, the still flowing oxygen burns up any remaining fuel gas [or hot...
  2. J

    fuselage welding

    Hi there, You cannot use propane or anything else either, despite what makers of various gases might like to claim. You see, it is not just a matter of heat, it is a matter of flame chemistry. When you burn oxy acetylene in air the reaction takes place in two stages. 1, in the inner cone of...
  3. J

    Milling machine/lathe options

    Hi there, Some advice for you.. I am in the UK so i am not familiar with American machine tool makers. Trust me though, a 60 year old American built lathe will be FAR FAR better than ANY chinese lathe you can buy, and, probably cheaper too. Here is my own Harrison. It is about 50 years old...
  4. J

    Tennessee Lawmakers Propose Legislation Banning ‘Chemtrails’

    I have seen them caused precisely 3 feet off the ground caused by the rear "wing" on a formula one car as it blasts up to 200 mph.. john..
  5. J

    fuselage welding

    7014 is definitely NOT a low hydrogen rod.. john.
  6. J

    Laser detection technology ?

    Hi There, I am in the uk and work in a large hospital. One night i was driving through the dark unlit grounds on the way home when someone shone one of the green ones at me. Happily for me, the millisecond it hit me i turned away and they only got one eye anyway. Still, i cannot remember...
  7. J

    My Design & Construction

    Dear me... If that is your first one wait till you have had a bit of practice! I think that is brilliant to be honest.. john..
  8. J

    Horrible news from Vans Aircraft

    What you say about the loss of strength at welded joints is correct, the material is "overaged" and the precipitation hardening effect is lost with no way of getting it back. If you tried to re-heat treat the welded joint, you would overage the material further out instead. IF though, you could...
  9. J

    Hirth -one failed CDI (dual CDI) fails FI ECU and engine stops

    Ahh, sorry, i thought you meant that you shorted the primary to earth, so effectively leaving the power to the coil but with the points closed.. john..
  10. J

    Parts For Sale Limbach engines- lots of them

    If that is the case you have the wrong plugs installed.. john..
  11. J

    Parts For Sale Limbach engines- lots of them

    Hi All, i am in the uk. A two second google reveals they still make them, so parts and all should be easy.. https://limflug.de/en/products/engines-56kw-75kw.php john..
  12. J

    Hirth -one failed CDI (dual CDI) fails FI ECU and engine stops

    Now i know nothing of aeroplanes, but you turned off the ignition by shorting it to earth???? and wonder why the current goes up???? Not sure what you mean... john...
  13. J

    Maybe a small step for ADHD sufferers

    Could very well be the case that an autistic person would be better, carrying out the task of coping with the emergency [as trained to do so] very well due to their "yes/no" "black/white" style of thinking??? john..
  14. J

    Maybe a small step for ADHD sufferers

    Yes, and as i explained, you need to have a VERY specific set of impairments to be diagnosed with Autism or ADHD or anything else. The people that do the assessing are [at least here in the uk] VERY experienced. If you do not meet ALL of the required criteria, and they are very specific, you...
  15. J

    Maybe a small step for ADHD sufferers

    Errm, no.... At least here in the UK you cannot randomly decide that you have various conditions or illnesses. So far as our health service is concerned, and quite rightly so, unless you were PROPERLY diagnosed, then you do not have "it" The diagnosis IS clearly defined and labeled and they DO...
  16. J

    The history of Fox model airplane engines

    How far had it gone??? Was it ok?? john..
  17. J

    Understanding pulleys and tackles formulas?

    Hi all, Pulley diameter DEFINITELY matters... Google "differential chain block" and you will see a chain block with no gearing that operates purely by virtue of the pulleys being different sizes and all operating on the same continuous chain.. As for how much lifting force, since the tension...
  18. J

    Stick vs Flux Wire vs Homebuilding ?

    As i said, it is not a question of the welding ITSELF, it is the FACT, that unless all you are doing is full pen butt welds, you will have flux trapped inside the joint which WILL make no mistake, eat its way back out..
  19. J

    Stick vs Flux Wire vs Homebuilding ?

    I had to google who this "Kent White" was.. Anyway, gas welding aluminium is a pointless waste of time, no matter what any "expert" likes to think.. You will have a MUCH larger heat affected zone which generally will result in a large loss of strength in this area, Apart from this, you CANNOT do...
  20. J

    Stick vs Flux Wire vs Homebuilding ?

    Yes, OA is far better than mig.. Mig, was/is purely intended as a very fast way of doing the business in a production environment. There are proper OA rods the british standard would be BS1453 1972 [1987] : A1 No idea what the AWS code would be.. They are mild steel rods.. There is a low...
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