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  1. N

    Vibration free powerplant.

    Asume that Lycoming cylinder pressure is 42 bar around 30 degree after top dead center. Wonder engine has one crank at 31 degree and one on 29 degree and due to lower needed BMEP we asume a pressure of 16 bar. Crank arms are 60mm and connecting rods 170mm and piston top areas 0.05 sq m. The 31...
  2. N

    Vibration free powerplant.

    Newer technology Lycoming io390 BMEP 11bar / 22kg/l Wonder engine same compression ratio 9:1 Needed BMEP 4.2 at 1.2 liter gives 30kW for a fly ready mass of ca10kg. Wonder engine has better stroke bore ratio, no camshaft and no cylinder heads so estimate is conservative. I am working on the way...
  3. N

    Vibration free powerplant.

    Thank You for comments. Numbers and calculations will be even more usefull . I plan on supplying the infinite 30 kW market for aeroplanes that cannot be rolled faster than once per two seconds. If cranks get out of sync ,fuel and /or ignition will be cut and props can windmill until...
  4. N

    Vibration free powerplant.

    It becomes tempting to try and build a reduced scale model as cheap as possible. Is there somewhere one can buy two or three bladed ,mirrored but else identical model props say 300 to 400 mm diameter? Synchronisation of shafts can be done with a crossed chain(Wrigth Brothers 1903) or a timing...
  5. N

    Vibration free powerplant.

    Estimating the nessesary mass and torque capacity of electric synchro depends on type of aeroplane. If plane can roll one turn per five seconds(is that realistic?) and props are synchroed to 60 rps we need some power tranfer from one to the other as one will do 60.2 and the other59.8 rps...
  6. N

    Vibration free powerplant.

    Numbers McCulloch O-100-1: Bmep 5.6 bar 21.3 kg/liter Wonder engine needs 4.2 bar and 1.2 liter trying to make 30kW at same compression ratio.(8 to 1) Mass of fly-ready engine minus electric synchro can be less than 19kg using 1955 technology.
  7. N

    Vibration free powerplant.

    The kW/kg estimation of the wonder engine twin prop consist of two parts. First is the CE part second is the two electric machines. The CE part is easy. If McCullough could make engines that ran more than a million revs 1945 so can we with same mass/volume if we see same maximum pressure in...
  8. N

    Vibration free powerplant.

    The way to find out is maybe to make a quarter scale aerobatic model with two electric motors ,two props(Mirrored) and then regulate two independent power controlers to keep props in synch.By measuring the power consumed to each and sample data or relay them back to sender it will be possible...
  9. N

    Vibration free powerplant.

    Just like Boing 737Max
  10. N

    Vibration free powerplant.

    I have had the honour of talking with Eric Bratt that was driving force behind the F16XL like Saab Draken. He had been pilot of the Swedish Stuka during war2.His oppinion on small aircraft was that there had been no advance in fourseater aluminium aircrafts since Messeschmidt 108 from...
  11. N

    Vibration free powerplant.

    None as I still like my inverted V2 better . I am an old man and start loosing things out of hands . I only use my lathe for things less than 2-3kg mass. It has been fun thinking of the Junkers scheme and world do not really needs 30kW aeroengines.
  12. N

    Vibration free powerplant.

    Counterrotating cancels torque reaction and make less prop noise. A mean effective pressure of 4 to 5 bar will only need little turbo and cold inlet crankcase in series. Exhaust piston can then be oil cooled if needed. Achates can make more usefull engines using the twin AC generators method...
  13. N

    Vibration free powerplant.

    I believe I can make power/mass better than Rotax. If not I would not waste Your valuable time here. The mechanical layout of Achates is to complicated but they must have done some very good and expensive work in piston rings and cylinder ports.
  14. N

    Vibration free powerplant.

    If You dont see the potential advantage relative to state of art engines, why bother?
  15. N

    Vibration free powerplant.

    Sounds like a very good way to spend a life
  16. N

    Vibration free powerplant.

    I will start to sell to powered parachutes and ultralight trikes.Aerobatic planes are for my inheritors
  17. N

    Vibration free powerplant.

    I have tried for years to design a mechanical synchro gear and have never succeded in thinking this is it.The electrical solution has been known to me to work since 1992 but I have erroneously thought it to heavy. Greenass532 put in a link to the Emrax motors of Pipistrel fame and let me try to...
  18. N

    Vibration free powerplant.

    To proced the explanation. If the two pistons do same work,have same friction and underside pumping and the two propellers are equal but mirrored, generators will take no power but Will continiously compare voltage and phase and try to be in step. If piston masses are the same there will be no...
  19. N

    Vibration free powerplant.

    Another wise guy.Thank You
  20. N

    Vibration free powerplant.

    My generators work like two big power stations supplying a common grid.If one starts to get in front of the other it will deliver more power that sligthly unload to the sister and help her catch up. They are AC generators and if they are connected in antiphase nasty things happen. The two...
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