Hello Bob, I'll answer your question from my primary channel. It was an ad-hoc 'on the fly' design. It's not open source but in reality it was a very poor design. I contacted Helix regarding a suitable prop for the little 2 stroke with 5:1 ratio reduction and requiring the maximum efficiency. They came back to me with their 1.8m prop, and showed me an image of an electric paramotor with the same prop. They sent me the test data to.
It wasn't cheap though, over £400 including shipping.
Hello Bob, I'll answer your question from my primary channel. It was an ad-hoc 'on the fly' design. It's not open source but in reality it was a very poor design. I contacted Helix regarding a suitable prop for the little 2 stroke with 5:1 ratio reduction and requiring the maximum efficiency. They came back to me with their 1.8m prop, and showed me an image of an electric paramotor with the same prop. They sent me the test data to.
It wasn't cheap though, over £400 including shipping.