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  1. kubark42

    Using only 4 out of 6 propeller mounting bolts

    I am constructing a folding prop hub for an electric motor which has 6 mounting holes, spaced evenly at 60 degrees. I notice some motors only use 4 holes, spaced evenly at 90 degrees. And in fact, for this motor, it is only held onto its mount by 4 bolts. So it seems there's good evidence 4...
  2. kubark42

    Propeller shaft design

    I'm looking for information on propeller shaft design for a pusher prop. I have a belt-driven system where the pulleys mount directly to the propeller, so the shaft is more of a free-wheeling axle than it is a power-transmitting shaft. As such, I only have bending moments to worry about. Thus...
  3. kubark42

    Comparing published motor and engine power output specifications

    TLDR; before comparing the power ratings of motors and engines, first derate the motor by its efficiency. ------------------------------------------------------------------- I realized that many people new to motors might not realize that the brushless motors we'd like to use in airplanes are...
  4. kubark42

    Review request: Motor pylon for a self-launching glider

    I'd love some feedback on a design I'm working on. It adapts from the pylon in the self-launching AC-5M. The idea is to replace the draggy plate design with a streamlined pylon. The motors connects to the shaft pulley (not shown) with a belt. This is a pusher configuration. This design is...
  5. kubark42

    Running two-stroke engines lean-of-peak

    I have a 25hp single-cylinder two-stroke engine and I'm wondering about lean-of-peak operation. I've flown extensively LOP in a Piper Arrow, and am well versed in the (AFAIK now-settled) debate on the relative merits of ROP vs LOP. Suffice to say that we are very pleased with our operations...
  6. kubark42

    Brake effectiveness standards

    How have you guys spec'ed your brake systems? From the sources I've looked at, it doesn't seem like there's a strong regulatory stance on this. Instead, it seems to be more of an expectation to pair the airplane capabilities with the task at hand. I.e., don't land a Cessna Citation on a 2000'...
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