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Pyro
Administrator
I've seen the official specs from the Air Ministry, and as I alluded to before, they don't add up. For example, they cite a time to climb to 3280 feet of 39 seconds or an average of 5046 feet per minute. This performance is cited at a weight of 6459 pounds.
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Test of aircraft # M.M.9486 is A
Technical Manual C.A. 670/1 is B
Prototype numbers are C
speed @ alt and time to alt
3,280 6,560 9,840 13,120
A 320@ 52sec 332@ 1:48 343@ 2:47 354@ 3:49
B 324@ 39sec 338@ 1:28 352@ 2:28 364@ 3:32
C 319@ 34sec 334@ 1:19 349@ 2:26 362@ 3:27
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Let's examine those numbers in detail. It takes about 988 excess THP(thrust horsepower) to attain that performance at that weight.
They cite brake horsepower ratings of 1040 and 1075 for climb and emergency power settings respectively. Let's go with the high
figure and say 1075 BHP.
In order to make the 202 climb like they claim, you need a completely dragless airframe and airfoil, and a propeller capable of 92% efficiency. Both of these are outside the realm of reality, and therefore the data is invalid no matter how official and accurate the source appears.
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How does aircraft # M.M.9486 look?
See page 10 of the Macchi 202 Profile for the rest of the time and speed to alt numbers. I think that the prototype and "book" numbers were based on a pull-up from top sea level speed during tests.
Or so it LOOKS to me.
Heck, you don't even support my Mac, but I do like the bird and have been following this thread
