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  • Users: Techno97
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  1. Techno97

    Friction bearing VS frictionless

    Not sure which kind to use. The engine should only be spinning in the 6500 rpm area. The oil will be pressurized in either use but would a fog spray for frictionless bearings have less loss or other benefits over the gallery fed friction bearings? Being a radial engine have all those connecting...
  2. Techno97

    Centrifugal blowers and Variable belt drives

    Can centrifugal superchargers use a variable belt drive such as Snowmobiles use? I have a project that if they can would simplify it. This isn't a car use but wonder why this isn't done? To be clear. Running the blower at a high speed/boost with minimal engine RPM. Running the blower at its best...
  3. Techno97

    HP values from Dynos

    I understand a Dyno loads an engine already at a high rpm and takes it down for the different rpm values. If the engine were instead accelerated up while under a dyno load would this result in different readings? It was mentioned that for an Outboard engine maximum hp is a deception as the...
  4. Techno97

    Thrust from a compressed gas cylinder

    How do I calculate the thrust from a CO2 gas bottle? 2,000 PSI pressure. Looking for maximum thrust available from this power source. Does nozzle size matter?
  5. Techno97

    Surface roughness for maximum speed

    Does anyone know of testing that shows what affect the surface roughness of the hull has on speeds over 100 mph? I've heard of recent testing that indicated a smooth surface was superior, but people who race say sanded to 220 grit is the fastest surface. I was considering coating the running...
  6. Techno97

    I need a rotational stress formula

    I have one from Marks book of engineering (5-55) but it also uses terms that leads to further computation. p= mass density, lb.s^2/in^4 This has stumped me. I have no idea of what I should place in for these values. What is inches raised to the fourth? Is this mulitplied by gravity? Don't...

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