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Tell Shannon that there are several engineers who participate here (I have an MS from Caltech). I have climb-rate and cruise-speed data that might be adequate for him to calculate/estimate the added drag of the landing gear. The "clean" climb rate is 1100 fpm (270/320 with only front/rear engine) and decreases by 110 fpm with the gear down (240 fpm if the doors stick open). Also, my recollection from what others have written here and from my own experience when I've flown with the gear down because of troubles/concerns with the system, is that the 140 Kts typical cruise speed goes down by about 5 Kts; others are encouraged to add their views if their cruise experience is different.
Ernie
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