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I must admit that because I'm not the "engine guy" on this project that I can't be sure of the answers but I think that lower revs needed for the same horsepower in cruise (450hp rotory vs 350hp piston) might be why he is thinking that it will use less fuel than the piston engine in cruise.
On 4/09/2019 6:01 am, Charlie England ceengland7@gmail.com wrote:
On 9/3/2019 8:37 AM, Kent Bedford kbedford@alphalink.com.au wrote:
A 450hp all aluminium 4 rotor + turbo with cooling etc should come in at about same weight as the 350hp Lycoming IE2 or Continental IOF-550 but the rotary will have 100hp more and burn less fuel during cruise.
Welll.....only if you've found a way to re-write the laws of physics. :-)
Rotaries are slightly less efficient, from a BSFC standpoint, than properly leaned piston engines. There's just no way around it. Now, they can *cost less* to purchase, and *cost less* in what you pay for fuel (cheapest regular mogas you can find vs avgas for the a/c engine), but even that advantage can go away if you're truly boosting the engine instead of turbo-normalizing.
Charlie
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