Paul,

I ran some numbers on the TTC airplane. Assuming rotation at 60 kias, I get him airborne in 5.2 seconds (assuming 5 seconds to advance throttle from idle to full power) and less than 200 feet, and then climbing at 12,400 fpm. The rate of climb varies by 12 fpm per pound of weight. The sensitivity of climb rate to equivalent flat plate area is around 200 fpm per square foot. Of course all these numbers are approximate because I did not have exact specifications for the airplane and the span efficiency and prop efficiency are unknown. I assumed 0.8 span efficiency and .80 prop.

How do these predictions compare with yours?

A small correction: if I take 10 gallons off the top for taxi, climb, and reserve, Melmoth 2's theoretical range is around 3,000 nm, not 2,000, assuming an average sfc of 0.5. Of course, that would require flying at an unbearably low speed. The internal fuel capacity is 142 gallons; both wings are entirely wet.

Thank you for an enjoyable visit.

Peter Garrison

That is about what we calculate. 175 MPH straight up :-)
One of our engineers on here works for AirBus

Thank you Peter for calculating it.

Thanks also for the corrections on the Melmoth'

Paul Lamar


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