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  1. W

    Aeromarine Truelite / Aviad MG21

    Consider the simetric airfoil. Maibe the Zigolo 12 "Goat" is one of the slowest, but this new 21 "Truelite" is one of the fastest, with a longer startup roll...
  2. W

    Traveling with a twin engine 2 stroke airplane?

    here a tri motor. https://www.vfraviation.it/notizie/vola-trimotore-asso/ for sale http://annunci.ultraleggero.it/annuncio/asso-trimotore
  3. W

    Running two-stroke engines lean-of-peak

    maibe the major difficult is to know the exact amounth of possible leaning. an other is the mixture enriching around the sparks and the avoiding to transport unburned fuel out of the combustion camber. a feedback ist extreme important. A chemical feedbeck (lambda or flame color) is reliabler...
  4. W

    Rotax 850 E-TEC Turbo on a plane?

    my 2 cents. the typicall use is: -a lot of torque & power during startup at low altitude - aprox 50-80 HP during flight, at any altitude. conclusion: why turbo? we dont need soo much power at altitude. But during take off we dont have any overpowering. for this reason maibe the E-tec 850...
  5. W

    2 stroke spark ignition diesel outboard engine

    in this case, diesel means the fuel. This engine use diesel fuel only. i think because it have lubrifing characteristics.
  6. W

    thight gas piston.

    I want design a pneumatic suspension for an undercarriage. (Works in traction). I must make a both-side gas piston. How can i make it absolute thight without any oil around? Thank you
  7. W

    Electronic Fuel Injection for 2-stoke

    We dont need the small injector. Our range is aprox. 50-120%. Can we regulate separatly oil and fuel? Are the injectors able to spray the same quantity also with different oils, poor solutions etc? A lambda feedback is ok, but is not absolutly safe. A electric system is not fail safe. The exaust...
  8. W

    Ahh, the impressive Slepcev Storch

    can be a foil nearly the NACA 4315-73 profile..
  9. W

    Piper Cub Lift Coeffiicent

    Consider also the negative lift of the elevator. Especialli in slow flying this additional negative force is high.
  10. W

    Rotax and direct injection!

    here the newest E-TEC engine with an additional injector https://www.youtube.com/watch?v=c1LoVKaC8Ds
  11. W

    Rough field landing gear

  12. W

    Another Landing Gear Strut Question

    my opinion. you debilitate a thin bar charged in compression ? Its ok when you compensate with reinforcing.
  13. W

    Hybrids taking off.

    advantages of a serial hybride powerplant: -you can put more small propellers in optimal places -the fuel engine can be placed optimal for aerodinamic and gravity center -the propellers can have a fix pitch -the electric motors have a very broad band of rpm with constant power -tubed propellers...
  14. W

    "Shark" composite tandem rotax from Slovakia??

    i have heared that the retractable gear version is a lot faster as the fixed gear. The difference is impressive (230 vs 290 Km/h) and more as usual expected. Can be buyed also with power increased turbo Rotax (140 HP). This aircraft is buld with a interesting tecnology. The resin originally is...
  15. W

    4200 RPM Propellor

    The hi speed propellers must have a hi speed airfoil design. For exemple the thick wooden Clark-Y propeller can rotate max 0.72-0.75 Mach. But exist a lot of propeller airplanes what fly nearly this speed :) and the prop must rotate absolute faster. A thin carbon profile can have 0.85 M...
  16. W

    hmm. D motor f 39 or ULpower 360iS ? Cub style 2-seater (highlander)

    I have a similar CUB airplane with a Ulpower 350iS Motor. The problem is the speed of the propeller. The power of the engine is good enough above 2800 rpm. But during startup i have just 2350 rpm = 107 HP But its better to have a big prop and less rpm. The Ulpower decrease a lot of power...
  17. W

    Westlake 2 Stroke Opposed Piston Diesel

    A risonance exaust must be very long. But it can give a great contribute to exchange the air more times and cool down the hot exaust surfaces.
  18. W

    Need Help with my Kawasaki 440A2 with 2.667 re-drive and 59" 3-blade ultra-prop

    To obtain a optimal cooling of the second cylinder, we must orient the exit air of the first cylinder out of the second one. For exemple with a sheet, in S-shape, beginning with an angle of 45° nestled to the first cyl. , then trough both cylinders, ended huddled 45° against the second cyl...
  19. W

    Z-PROPELLER ?

    he put only the lift coefficient. For a propeller the most important aerodinamic parameter is the relation between lift and drag.
  20. W

    Verner Motor Scarlett 5si is avaliable!

    The 5si have proportinally not so much power as the bigger and the smaller version.
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