Digitil
Member
Hello. Im new here. I'm not planning to build anything yet. Just learning. And somehow it feels right to learn from those who know by asking lots of possibly silly questions.
Trying to figure out how to determine appropriate engine choices.
So far I learned that weight to power ratio is important. Many people mention rotax 447 but apparently it's being discontinued.
Some questions I have:
1- what's the minimum weight sans engine that a 1-seater no frills Gyrocopter ends up as? I'm assuming standard aeronautic materials alu fiberglass.
2- I read that you need at least 45 Hp bit where does that number come from? Is there a formula to calculate this? I imagine something about thrust and weight and rotor size and air density altitude etc.
3- looking around the net for 50 Hp 4 stroke engines I came across outboard motors. Is it feasible to use those for powering a propeller? If no why not?
Thanks to you all on this forum. Looking forward to learning a lot more about Gyrocopter engineering.
Trying to figure out how to determine appropriate engine choices.
So far I learned that weight to power ratio is important. Many people mention rotax 447 but apparently it's being discontinued.
Some questions I have:
1- what's the minimum weight sans engine that a 1-seater no frills Gyrocopter ends up as? I'm assuming standard aeronautic materials alu fiberglass.
2- I read that you need at least 45 Hp bit where does that number come from? Is there a formula to calculate this? I imagine something about thrust and weight and rotor size and air density altitude etc.
3- looking around the net for 50 Hp 4 stroke engines I came across outboard motors. Is it feasible to use those for powering a propeller? If no why not?
Thanks to you all on this forum. Looking forward to learning a lot more about Gyrocopter engineering.
