I have to disagree with Wolfgang on this one, but I do accept his premise that a 240 HP turbine will consume a lot more fuel than a 240 HP recip.
But the amazing thing is getting 241 HP out of a 125 pound engine. *That* is impressive!
Put it in context - my IO-360 gets 180 HP and weighs 260 pounds. Marv's engine provides 33% more horsepower and weighs less than half. We can run every comparison under the sun and argue all day long to no conclusion -- how much extra fuel weight we need to carry, how much less engine weight we need, and so forth -- but the bottom line is that this little engine enables some aircraft designs that just would not be possible with a recip.
- Rob Wolf