Recent content by mm4440


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  1. mm4440

    3/4th Scale Replica Bell P-39 Airacobra

    Diesel Electric drive works well for locomotives where it functions as a CVT and weight is good for adhesion. A drive shaft is 99+% efficient and a carbon one is light and about $1000; a hybrid electric drive would be less efficient, likely heavier and much more expensive.
  2. mm4440

    Lighweight opposite 2-stroke engines

    Two things that show the limited thinking of that statement are supercharging and prop reduction gearing which have been used on aviation engines for about one hundred years. A ~500cc flat twin would make more sense than a big single with a balance shaft. A two stroke single with balance shaft...
  3. mm4440

    Lighweight opposite 2-stroke engines

    A ~500cc flat twin would make more sense than a big single with a balance shaft.
  4. mm4440

    AmEagle American Eaglet

    Hi, a miracle has happened; we have a new newsletter editor. Watch our web site; <www.esoaring.com> We need more contributors.
  5. mm4440

    Variations on Arup planform?

    Hi back in the 1970s I owned an Arup S2 replica (I did not build it.) I spoke to Milt Hatfield, one of the Arup's original pilots on the phone. Milt built an ultralight version with a simplified planform with straight edges. I think he called it "The Little Bird". If you search sport Aviation...
  6. mm4440

    Thinking about an Aeromomentum for an RV-12

    There is a FWF Aeromomentum engine for the RV12. It was at Oshkosh last year.
  7. mm4440

    What do you think about "e-soaring"?

  8. mm4440

    What do you think about "e-soaring"?

    e-VTOL stuff belongs in a different thread.
  9. mm4440

    Seeing Thermals

    LIDAR is Laser based not radio so higher resolution.
  10. mm4440

    Seeing Thermals

    https://newatlas.com/military/trijicon-ventus-handheld-wind-mapping/?utm_source=New+Atlas+Subscribers&utm_campaign=9241f962de-EMAIL_CAMPAIGN_2020_02_14_02_37&utm_medium=email&utm_term=0_65b67362bd-9241f962de-76688727 This could do it. Some years ago in Soaring magazine an Army Apache pilot...
  11. mm4440

    A good common engine to convert?

    60 degree V-6s do not need balance shafts; some 90 degree V-6 engines do make use of counter balance shafts.
  12. mm4440

    A good common engine to convert?

    There are flat Subarus flying in that power range. Porsches are too expensive to consider. A flat 4 has better inherent balance than an inline 4. The Suzuki G13BB is an excellent choice for a 100 hp conversion and gearboxes are available from at least two sources. Generalizations are not useful...
  13. mm4440

    Wanted Hall Cherokee

    If you go to the end of the web site above there was an original plan set offered in April 2019;might still be there.