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  1. karlbamforth

    Conductive paint

    Thanks Fvnktion i will give them a try. Karl.
  2. karlbamforth

    BLADE FLAPPING

    The expalation of flapping hinges etc is quite a complex subject to explain here. Probably easier to get a book. When viewed from above the blades on one side are seen to be moving in a forward direction whilst the opposite blades are moving rearwards. As the helicoper starts to move foreward...
  3. karlbamforth

    Wing spar stress calculations

    Thanks to everybody for all your help. After a little research I have managed to contact 3 other potential IBIS builders in the UK and we have decided to have the calculations done proffesionally and share the costs. This would seem the most efficient way of getting the calculations done and...
  4. karlbamforth

    Wing spar stress calculations

    Hi Jan, I havn't started the build yet. I wanted to make sure everything was OK first. If you are still interested the aircraft is called the Ibis and can be seen at the link below. http://www.holsink.demon.nl/
  5. karlbamforth

    Basic book on helicopter theory

    Try this link its for a downloadable version of the rotorcraft flying handbook. http://www.prachapter34.com/faa%20rotorcraft%20handbook.pdf Hope it helps.
  6. karlbamforth

    Wing spar stress calculations

    Thanks for that OneMoreChance, that was just the kind of information I was looking for. A friend has loaned me his books on the subject so I am doing a bit of self study and any calculations I make will be checked by the certifying authorities. Karl
  7. karlbamforth

    Wing spar stress calculations

    Thanks everybody for your help. Not every country requires the calculations for a homebuilt aircraft. I.E. proof that a design has been flying for many years in another country without mishap is enough evidence for some authorities. The design in question is flying in France and the USA. The...
  8. karlbamforth

    Wing spar stress calculations

    Does anyone know of a spreadsheet for calculating wing spar stresses. I am not designing an aircraft, just building a plans design that has already been flying for some time. The UK authorities insist that I provide the relevent stress calculations, this means back engineering from the drawings...
  9. karlbamforth

    Conductive paint

    Some years ago in a previous employment we used a metallic spray paint on plastic that was conductive after it dried. It was possible to pass a 12v current through the dry paint layer. I now have a use for the paint again but cannot remember what it was, or who manufactured it. Anybody got any...
  10. karlbamforth

    What are your biggest frustrations about work?

    Things I love, When my staff thank me for extra time off work. Hearing that my staff defended my reputation in my absence. The gobsmacked look on my managers face when he realised we were £25,000 under budget. Things I hate, Same manager telling me there is no money available for pay rises or...
  11. karlbamforth

    Cross flow fans

    Hi all, Thanks for your comments, it is apparently quite difficult to explain how cross-flow fans work. The link below is for a 2D animation if anyone is interested. http://www.fluent.com/solutions/examples/img/x144i1_lg.gif It would appear that the comments about a vortex in the centre is...
  12. karlbamforth

    Cross flow fans

    Hi, A quick question, Can anybody explain how a crossflow fan works? I have seen an entry on another site that they can be used as an air pump to considerable increase pressure and or flow. So far I have been unable to find anyone or a website to explain how it works. My first impression is that...
  13. karlbamforth

    Passive Torque Control

    Hi Dallasrotor, Thanks for your comments but I think you may have misunderstood what I though I had said. Badly written on my part possibly. I do not consider aviation problems as a foregone conclusion. The first line on my post maybe should have read " Its good to know that I am not the only...
  14. karlbamforth

    Passive Torque Control

    Its good to know that ppl are still thinking of alternate ways of overcoming aviation problems. A lot of companies have already tried the idea of control surfaces in the downwash. One used a control surface in place of the tailboom, it was adjustable and was basically a rudder in the downwash...
  15. karlbamforth

    Cockpit Airbag System

    Cessna are currently offering a seat harness that has an airbag built in to it. Personally I wouldn't want anything like that in the crew seats of a helicopter, accidental deployment while still in the air would probably cause full control deflection and be fatal.
  16. karlbamforth

    Rubber or Bladder Press Designs

    Does anyone know the spec of the rubber used in the press ? I already use a small shop press but am having trouble getting rubber pads of the right grade. Another Karl.
  17. karlbamforth

    Rotorcraft Engine Controls

    In very simple terms. Stall is what happens when the compressor blades stall, similar to an aeroplane wing, often caused by ingesting something. Surge is what happens immediately after a severe stall condition, the high pressure air downstream of the compressor surges forwards. In an axial flow...
  18. karlbamforth

    Taking Notes during Phone Calls

    Re Emails, A past employer had a habit of sending me Emails in block capitals reminding me of "my responsibilities to the company". I spoke to him explaining that block capitals was widely considered to be shouting and that reminding me of my responsibilities was threatening, I then went on to...
  19. karlbamforth

    Learn a Language

    Although I am not fluent in anything other than my native english I can be polite using Hello, please, thankyou etc and order food and drink in French, German and Spanish. I have always found that as long as I attempt to speak their language they will go out of their way to help me. I once had...
  20. karlbamforth

    Lynch motor.

    Thanks for the prompt reply, You have highlighted one of the reasons I would like to see a diagram. Some of the articles I have read imply it has a laminated iron or copper armature, apparently laminated radially rather than printed circuit board. I just don't seem to be able to get my head...

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