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  1. mm4440

    Formula-I?

    If you follow Bruce's advice 35hp should give a 200mph+ top speed
  2. mm4440

    Formula-I?

    Industrial engines are rated at 3600 rpm with torque peaks at ~2500 rpm. They all need more cam to maximize power at expected operating rpm. Other breathing improvement should be done. 1 hp per cu in is possible if you turn them fast enough, rpms do not weigh anything, Fan output goes up faster...
  3. mm4440

    Al Backstrom articles and projects

    It is worth finding Al's articles in the Sport Aviation and Soaring magazine's back issues.
  4. mm4440

    Formula-I?

    Honda has 688 cc twins. You have to draw the line somewhere.
  5. mm4440

    Formula-I?

    Hi, an outboard bearing to take the major prop loads has been used to stop crank braking since Steve Whitman or earlier on auto engine conversions. A prop shaft extension would help streamlining and prop efficiency. How about 750cc can use psru and 1 l. engines only direct drive? With DD the...
  6. mm4440

    Formula-I?

    My suggestion is to limit displacement to 750cc industrial engine with no power adders (supercharging, nitrous, Nitro-,etc.) to limit weight and cost. I would allow water injection. Any generally available fuel, av or auto gas, E85, alcohols. Reduced or direct drive, maybe different class if DD...
  7. mm4440

    Formula-I?

    The original had an inverted V tail.
  8. mm4440

    SDS CPI-2 Ignition System Back in Production

    Hi Ross, Can you use your 6 cylinder units with singe output coils for the 3 cylinder engines?
  9. mm4440

    Drilling metal tube

    Try a 3/4" end mill with 4 flutes..
  10. mm4440

    PIK-26 Plans set in English

    Aim for 20%to 25% MAC and establish range by flight testing.
  11. mm4440

    Just how fast was the SR-71?

    An interesting statement from an SR-71 pilot, " Whenever I needed it to go faster, it would."
  12. mm4440

    Could a well seasoned homebuilder build himself a vehicle that run on the streets ?

    https://www.neue-kabinenroller.de/en/messerschmitt-kabinenroller/messerschmitt-kr-202-e/
  13. mm4440

    Could a well seasoned homebuilder build himself a vehicle that run on the streets ?

    There was a Schmidt replica in England . It used a modern Honda 4 stroke scooter powertrain. Not sure if the project survivied.
  14. mm4440

    Formula-I?

    A question. Do you think a race/airplane modified industrial engine would be less expensive, as reliable and safe as the relatively stock Formula-V engine?
  15. mm4440

    Formula-I?

    Racing is a Black Hole for money and time. I suggest concentrating on designing an airplane that is affordable, buildable, safe and fun to fly and when their are two or more of them you can think about racing. MTC.
  16. mm4440

    Short video featuring Arup

    ARUP S-2 had tip ailerons originally but were removed.
  17. mm4440

    Will there be a western soaring workshop in 2024?

    That is the plan. Are you working on a soaring machine?
  18. mm4440

    Stroker engines in airplanes

    Do not add any restriction on the suction side of a pump,
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