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  1. U

    Rotax 670

    I am not, and I never said that. You are combining two posts and making an assumption. But while we're all here, everyone please note: Rick, I apologize for post #2. I spoke when I didn't have your side of the story. Shortly after I did so, I realized I was letting my emotional reaction to the...
  2. U

    Best Cheap Hanger Door I have ever seen

    Buy free-standing shelving, and set it up a foot from the wall, so the door can slide in behind it. Bonus: You can now access the back side of the shelves when the door is closed, or even get back there with a broom to clean up after the birds and mice.
  3. U

    Why the animosity towards ultralights?

    For many GA pilots, the idea that people have decided to fly aerial vehicles with no legally-required training, with no airworthiness standards or required inspection, with no radios, at speeds far below normal traffic, sounds understandably scary. It's made worse when UL pilots don't know the...
  4. U

    Where should we use RG400 instead of RG58?

    More than power needs to be considered in choosing coax. The length, and the frequency of operation also affect loss. RG174 loses only about 1 dB in a 10-foot run at com frequencies, but loses 3 dB at transponder/ADS-B frequencies. A loss of 3 dB is losing 50% of the power transmitted through...
  5. U

    Rotax 670

    My intent was to suggest I'd want mine to be an original Rotax 670 as identified on the manufacturer's data plate.
  6. U

    B&S 49-series (810cm3/49ci) for aircraft use - TiPi's Q&A thread

    There's a guy on YouTube who modded a Kohler 725cc V-twin a few years ago. I communicated with him at the time, and he said if he had to do it again, he'd stick with the stock cam. Even at 5000+ RPM using a chain redrive, he saw no gain from the aftermarket cam. At 3600 RPM, you might actually...
  7. U

    100HP at FL10

    I was quoting the website. Sorry! Mark, does your "dry weight" include engine oil? If it does, I apologize and stand corrected. The total of the weights you quoted for coolant would be only about three quarts. Does that really do the job?
  8. U

    100HP at FL10

    AeroMomentum claims 85 HP, but doesn't say whether that requires the optional tuned exhaust. And the weight quoted is "dry," without what is likely 30+ pounds of oil and coolant. For the target weight and power mentioned above, snowmobile and personal watercraft engines will be a better...
  9. U

    O-100-- interesting new engine

    That depends on which open-loop system you're talking about. If it's an electronic system which accurately senses air temp and density and is programmed properly, I agree. If it's the mechanically-regulated system on a Lycoming, efficiency requires pilot attention to the manual mixture control.
  10. U

    High Sierra Fly in

    Because California refugees keep landing in Oregon and Utah, then support causes and laws that seek to turn their new states into the California they just escaped! (Perspective of a former Oregon and current Utah resident.) I must concede, however, that cancer researchers in CA have identified...
  11. U

    Airframe as Return Leg of Electrical Circuits

    Even then, they won't know for sure. Metal joints can loosen over time, alternator brushes can wear and cause increased system noise, after testing has been deemed complete. And what if the inaccuracy of an instrument is so subtle as to not be obvious? "Noise" doesn't just mean something audible...
  12. U

    Airframe as Return Leg of Electrical Circuits

    Because every redundant ground path creates another ground loop, which is an antenna for noise pickup. If the resistance of the connection between equipment and ground changes in resistance even slightly,it can be enough to put instruments out of calibration, introduce feedback squealing on com...
  13. U

    Briggs vanguard conversions

    Not really. Car and truck wheels and tires aren't meant to be spun at 2500 RPM or more. And with no resistance other than inertia of the wheel to hold the engine back, you're going to need to be mighty quick with your measurements! I did look into using a trailer disc brake to hold RPM for...
  14. U

    Briggs vanguard conversions

    Is there any concern about the mass of a big chunk of wood like this? It looks like the form factor would result in significantly more mass than a carved prop, especially problematic for reduction drives. Would it make sense perhaps to build one up from laminated layers of 1/4" plywood with a...
  15. U

    where to start learning about Gyros?

    A few years ago, the Popular Rotorcraft Association invited a major PPC manufacturer to hold its annual customer fly-in the same week as the PRA annual convention, all at PRA's airport in Mentone, IN. It worked out great. By the time the gyro guys were ready for their breakfast flight at 8:30am...
  16. U

    Briggs vanguard conversions

    Actually, if you can gather the required dimensional info on the engine, there are computer simulations which can very accurately predict the power after changes. But you need details such as cam profiles, flow test results on ports, etc. to get the simulation better than about + 5%. I'm hoping...
  17. U

    Trying to achieve turbonormalizing the home-built way

    No, you're not. Vne is expressed as indicated airspeed (and marked in red on the airspeed indicator) because it, like stall and other V-speeds, scales with decreasing density. Vne is a specific IAS no matter what the current TAS may be.
  18. U

    IvoProp inflight adjustable question...

    Be really careful if your two-stroke uses pre-mixed oil and fuel. If you take too much pitch out of the prop and create a light load at high RPM, you'll wind up with bearings starving for oil. If you have oil injection, you might get away with it. Two-strokes are very picky about having the...
  19. U

    HOME DEPOT LIFAN ENGINES

    I've found it avoids wasting time if I just skip over posts which appear to be based on the notion that a wall of text is more powerful than concise thoughts. I have an engine project coming up, and I think if I post about it I'll do one of those build threads that doesn't allow comments, just...
  20. U

    where to start learning about Gyros?

    Agreed - A great place to start.
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