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  1. DaveKillens

    headphone to telephone adaptor

    I just bought my boss a telephone headset that plugs into the handset cord. It can be used on any kind of phone, or line (single, or multiple business. It can easily be switched between handset and headset, just the flick of a switch. It is manufactured by a major telephone accessory manufacturer.
  2. DaveKillens

    More GFCI Breaker Mysteries

    Yes, many power bars just open the hot circuit, and leave the neutral and ground path closed. It only takes 6 ma for a GFCI to operate. I suspect some device plugged into the power bar has a slight path from neutral to ground. Personally, that is when I take out my ohmeter and check to discover...
  3. DaveKillens

    acetone to increase fuel mileage

    How can acetone affect my health? If you are exposed to acetone, it goes into your blood which then carries it to all the organs in your body. If it is a small amount, the liver breaks it down to chemicals that are not harmful and uses these chemicals to make energy for normal body functions...
  4. DaveKillens

    an unconventional question

    In the world of dirt motorcycles, a similar device has been around for decades. It's known as a decompressor, basically just a one way valve. It is used for kick starting (reduces the compression, and effort required to kick), and going downhill. It's nice to have one, just activate it, and you...
  5. DaveKillens

    aircraft propellors - variable speed - virtues and drawbacks

    Variable pitch props didn't realy matter when the aircraft took off at 40 knots, and it's maximum speed was 60 knots. But when high performance aircraft took off at around a hundred knots, and their maximum airspeed was well over 400, then a variable speed prop became essential. That is probably...
  6. DaveKillens

    water injection to gas engines

    For most applications, water is injected to cool the intake charge, and thus, aid in increasing power. Water is used to suppress detonation caused by high temperature and pressure developed within the combustion chamber (usually) when the effective compression ratio has been taken beyond the...
  7. DaveKillens

    Split Washer Placement

    I used to work on aircraft. I can never recall ever seeing a split washer on any component. If a bolt or nut had to be secured against backing out, split pins, or safety wire, or something that mechanically locked the part in place were used. Not just some part that hopefully resisted backing...
  8. DaveKillens

    curious about engine breaking

    I would strongly recommend attempting to teach a relatively inexperienced driver to downshift as entering a corner. Even expereinced, skilled racers can get into trouble doing that. Use the brakes to decelerate, and the engine to accelerate. They were designed for those functions. Brakes make...
  9. DaveKillens

    Infrared cameras in automotive racing.

    Racing tires work best at around 220 - 240 degrees F. Reading the temperatures on the tire can give a wealth of information on suspension, geometry, a lot more. I think that some racing endurance cars have infra red sensors built into the car, and they are used primarily for safety reason, to...
  10. DaveKillens

    cam profile precision/wear

    Can you incorporate a lever, so that you can get some kind of ratio between the cam and device it is supposed to actuate? I am assuming you have some vision of a cam that has lobes practically non-existant? With a lever, you could have those lobes four times larger, yet you could still get the...
  11. DaveKillens

    an unconventional question

    If I was to attempt to construct a device to suit the conditions you describe, I would use two chain drive tensioners. Visualize the two sprockets, and the length of chain running between each sprocket. There would be two straight lengths of chain. Just apply strong tensioners on each straight...
  12. DaveKillens

    Titanium

    The SR-71. Titaniumn accounted for 93% of it's structural weight. At the speeds it flew, the sustained high heat soaking of the SR-71 took airframe temperatures to 570 degrees C. At that temperature, aluminum would practically melt, or at best, have the strenght and consistency of soft licorice...

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