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  1. H

    Me 109F boundary layer bypass

    That might work with a simple problem of only a couple variables, but imagine a problem with 50 or 100 variables. It would take far too long to find which conditions are important and which have little effect. There are entire courses and many books available on design of experiments. As to...
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    Me 109F boundary layer bypass

    “It doesn’t matter how beautiful your theory is, it doesn’t matter how smart you are, if it doesn’t agree with experiment, it’s wrong”- Richard P. Feynman I agree. Testing showed marked improvement with internal stirring.
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    Me 109F boundary layer bypass

    Many common radiators are rather inefficient because they do no introduce turbulence inside the tubes carrying the heated fluids they wish to cool. It is rather surprising how quickly fluids tend to return to laminar flow inside of tubes and cooling plates (for high power transistors). Once...
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    Airplane on a treadmill

    There is only one force in action to oppose the aircraft’s powerplant, that is the energy stored in rotation of the wheels.
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    Most Beautiful Aircraft Ever Built

    The French didn’t invent the French Curve, it is based on segments of Euler’s spiral.
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    What makes an airplane go faster?

    While drag only goes up to the square, the power required is a cubic function. This is because to double the speed, you have half the time to perform the work.
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    Yamaha Out of Snowmobile Production by 2024/2025

    Don’t their Waverunners use the same basic engines?
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    Yamaha Out of Snowmobile Production by 2024/2025

    Must be that total lack of ice top un-named scientists have been yammering about.
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    NASA abandons (cancels) their X-57 electric plane project

    The blown wing concept was interesting, but cutting the wing area in half would only result in a 15% reduction in overall drag. The counter rotating props at the wing tips for propulsion always looked risky and oversized for countering vortices. As for the effect of the small motor props...
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    The history of Fox model airplane engines

    Sometimes you miss the grass and hit the concrete at an old Naval Air Station straight in at 200 mph
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    The history of Fox model airplane engines

    I think much of the gurgling sound attributed to ST sport RC engines was due to the aggressive timing used, particularly the exhaust timing as well as crank and bypass. OS and most of the industry had the exhaust at roughly 140 degrees while many Tigre’s used around 150 degrees. Engines set up...
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    The history of Fox model airplane engines

    I’ve been into modeling for over 60 years, still have the McCoy .35 that had more fuel poured over it than ever slipped past the needle valve. A Cox RR-1 was the first decent engine and then Tigre’s won my heart. The gurgling idle of a sport engine on approach or the screaming X-40 coming back...
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    Vans RV-15 design

    Perhaps the reason for moving the wing and the other modifications was due to engine selection. They may have planned on a six instead of a four, but engine prices have climbed so much since the initial design.
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    What was the first airplane you flew in and how old ?

    C170 when I was 4, right side of rear seat as dad took his mother and me up for a nighttime flight over Wichita. I guess he left mom at home with the new baby.
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    DC vs AC Rated Switches

    What works at sea level tends to fail as altitude increases.
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    Arnold rule; Mike Arnold's aerodynamic ideas

    It’s been a while since I watched any of the Arnold videos, and must admit I didn’t watch them all. I was heavily involved with R/C pylon racing for two decades, and still have a passing interest now close to 50 years after the first one I entered. These events have engine and airframe...
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    15% ethanol to be allowed in "normal" auto fuel?

    Background - retired Electrical Engineer that now operates our family farm and raises almost 2000 acres of corn which is consumed primarily by a local dairy and a local feed lot. We have in the past, sold corn to a an Ethanol plant (also local). The US on average has 10% of farmland (Roughly...
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    HBA Member "Day Jobs"

    When the mechanical engineer and I were developing the oxide etch chamber that achieved 2/3rd’s of the world’s market share, our company was rapidly growing. We interviewed dozens of engineers after scanning thousands of resumes. Any mention of hobbies where they built stuff usually moved...
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    HBA Member "Day Jobs"

    I should have bought Chris Machin out, but he wanted a loan. Brodak bought out what he had in inventory and still have some on their web site if you use the search function. As far as 1:1 planes, I have my private, Dad had commercial and A&P, and my grandfather claimed to have taken his first...
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    HBA Member "Day Jobs"

    Grew up as a farm kid. Crashed my first fuel powered model at five, due to PIO. Flew control line a lot until switching to RC at 16. Was selected to do a summer science program by the NSF before senior year, then college to study electrical engineering. There I went to work part time making...
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