testwest Posted November 2, 2010 Report Posted November 2, 2010 I do have a drag polar for the M20J. I'll need to contact its author to see if it can be shared. Stand by, Professor Scott. From the polar, a stock M20J has an equivalent flat plate area of 2.81 sq ft. Power-on L/D max is 16:1 at Vy (best rate of climb) speed, as expected. For Sector 95, think of it this way. Vx, best angle, is the best foot of climb per foot forward. [distance based]. Vy, best rate, also propeller (not jet) power-on L/D max, is the best foot of climb per second. [time based]. Carson's speed (at WOT), the one you never heard of, is the best foot of climb per forward velocity [speed based]. It's obvious graphically from the EAA 1000 article if you have a small working knowledge of calculus. And because of the marvelous design of our airplanes as KSMooniac alluded to, above, the resulting ROC at Carson's will wind up pretty close to the results at Vy anyway. Close enough so that any decrement may be masked by external factors (areas of lift and sink in the atmosphere). Climbing at Carson's speed also yields a whole host of benefits relating to engine cooling (which is what started this thread) and inflight visibility. People have been writing about it in the aviation press for years without knowing why....trite aviation journalist cliche #7 is "Best climb rate for the Belchfire 400 was about XX knots, but after awhile I lowered the nose for better visibility and engine performance blah blah blah" Carson's speed from the polar for the M20J airplane is ~113 KCAS at 2740# gross weight from sea level to about 13000', standard day and standard lapse rate. OK boys and girls, have at it. Feedback wanted. PS, at the risk of thread creep, I caught that Rush quote earlier in the list. The thinking man's rock band, for musical talent no one else in the history of rock and roll even comes close. Quote
testwest Posted August 21, 2011 Report Posted August 21, 2011 I am bumping this topic up for a subsequent post, thanks everyone. Quote
testwest Posted November 17, 2011 Report Posted November 17, 2011 Bump, again. There is a lot more coming on this subject...stand by, y'all. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.