Engine is one I am building from drawing board up for an aircraft that I am also building, hence the low rpm as it is direct drive.
- Static ground revs no more than 2700 other wise the propeller tips will break the sound barrier (inefficient)
- guessing: 3000 RPM (=50 rev / sec) = 330 m/sec, circumference = 6.6m. Is the propeller dia ~ 2meter ?
- we put as much pitch on prop as to limit revs
- also engine internals would not take high rpm (the internal forces go up by the square of the revs])
- legs out of bed in the sky causes one to sweat a bit , thats why we use the fan to keep us cool
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Injectors are out of a Nissan 280z are 2.6 ohms [ barbed tail, will consider changing ] and best idea of cc rate is 270.
- we do not recommend low-Z injectors even on ground.