- Dec 16, 2007
- Port Townsend WA
A coaxial has two individual rotors operating within the same descending column of air. The downwash of a coaxial is therefor higher, making the coaxial less efficient. The disc loading calculations of a coaxial should only include the area of one disc, not both.one very diffecult issue I find is who to listen to, what source is a good one, for example I found one page saying that the coaxial is way more efficient and stable then a tandem since you get rid of the weight and transmission losses, and I agree on that.. then I found another page that says the opposite claiming that in order to have a coaxial you will need 50% more horsepower!!! to lift the same weight! .. I understand tha aswell but who wins in the end..
The coaxial has no tail rotor loss, so that helps.