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  1. L

    Human CG position relative to seat

    I can probably help you with this. The model has been improved since 2012. Any pilot can be created with this and placed in any position.
  2. L

    Stroker engines in airplanes

    Hi REVAN, I see no reason why a longer stroke would be worse than short stroke length. The engine power is determined by the cylinder capacity and his volumetric efficiency (VE). However, one should not forget to respect the connecting rod stroke length ratio. Rod Lengths and Ratios
  3. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hi Niels, Do you have any idea after how many hours those engines need to be overhauled?
  4. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hello Lucky Dog The concept would work, especially for a slow revving direct drive engine. Direct drive slow running engine / the sound of a Harley / power/weight ratio of 1hp/1lbs. Furthermore, everything is acceptable. The downside is the one two stroke engines suffer from. Once...
  5. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hi Dan, I just looked at the specs of that engine and they are quite impressive. Power/weight ratio perfect! Speed 1000 rpm too high. Nois ... not for my ears. Furthermore, technically I don't see much similarity. 4 cylinder boxer and that's about it. It is a good point that you mention the...
  6. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hi TFF 'There has to be a waiting chamber.' I agree with that. A single cylinder can charge two downward movements of the piston during two revolutions in what I call the air-box. A two-cylinder boxer can also charge two downward movements of the pistons in one revolution. 'The YS model...
  7. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hi TiPi, No, for the power I had in mined it is absolutely necessary to use the suction of the 'atmospheric phase' to get already 80% VE into the cylinder. A total VE of 130 /... % can then be achieved over the following 60° to 80° crankshaft revolution via the built-up pressure (1.4 / 2.0...
  8. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Supercharging by piston pump yes, but after the cylinder is already filled up with 80% of his displacement.
  9. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hi rv6ejguy Much depends on the free volume left in the crankcase. The greater the difference in volume between pistons in TDP position and pistons in BDC position, the better the results. With original Rotax pistons we achieved a pressure of 1.7 bar on the test bench. In theory, a single...
  10. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Hi TFF, I think it should work with one cylinder and two cylinder boxer engines. I took a look at those YS model engines, but they use only the pressure generated by both pistons in the crankcase. The extra displaced volume (phase 1 suction) under atmospheric pressure is not used.
  11. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    The drawing serves to clarify the principle. Why not first build a prototype that is lubricated with a 2-stroke mixture? Needle bearings and suction of the mixture through the engine block and cylinder head could be sufficient to lubricate the engine. The engine would run at a maximum of 3500...
  12. L

    Possibly lightweight, direct-drive - high-power four-stroke?

    Since this is now an 'open project' I think it would be appropriate to remove this topic from the 'Project Logs' and make a discussion about it accessible to everyone. In theory this should work.
  13. L

    Designing/building of my 4-stroke (direct-drive) engine to replace the 277/477 Rotax

    Circumstances have forced me to put all project aside for a long time. These 'circumstances' were eventually resolved, but what time was lost can not be recovered. In my opinion, the principle that would be used in the new engine has too much potential to throw it away. I make my work available...
  14. L

    Looking for anthropometric human CAD drawing files

    I have no idea what you mean by 'artrkkhte....95%' or ... percentile .... But if you want to use my test crew just ask. I fly them over at light-speed.:) The shortest is 1.60 meter, the long one 2.00 meter. These guy's are made out of solids. (3D environment)
  15. L

    Hurricane/Spitfire-type control stick?

    Falcon XP use a 'broken stick'
  16. L

    Design to attract new homebuilders

    A pilot safety-cell, with attachment points according to a certain standard would be a good start. Around this cell you can build whatever you want. I'm sure we can offer plans for this cell with landing gear, instrument panel, flightcommands, fuel cell, …. and still be free to design any...
  17. L

    inverting rudder pedals

    This is what we are doing with the rudder pedals today. We could mount rudder pedals on a bike and see wat's best. The system used all over the world ore the reversed one ?
  18. L

    inverting rudder pedals

    Imagine that this is a simple IQ test. Witch arrow would you consider correct in the third drawing? The blue or the red one? Explain your answer.
  19. L

    inverting rudder pedals

    It's hard to admit but I believe a bought the scooter to soon....
  20. L

    inverting rudder pedals

    If we compare planes with all other moving machines, the pedals are reversed from the traditional way. Besides that, all the other reasons you mentioned are more important than a few pounds and a 'more logic way' of doing things. Could applying left and right brakes have anything to do with...
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