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Thank you all.

GregLocock: The Lift Equation for flying straight and level: m * g = k * CL * (Vp + Vw)^2 In consequence: CL = m * g / (k * (Vp + Vw)^2) (a) and if Vp + Vw -> 0 then CL -> infinity which is not correct. Everybody knows that a plane, below a certain speed, can not stay in the air, no matter...

SparWeb: Flyer I (1903) had a propeller placed underneath that revolved horizontally, according to an article signed Wilbur Wright and published in Feb. 1904!! "One of the propellers was set to revolve vertically and intended to give a forward motion, while the other underneath the machine...

A remark, instead of "the more lift it gets which can not be a correct assumption." read: "the larger CL gets". The lift for a certain speed V = p * V0, where p = a percentage and V0 = the speed at which CL = 0.62, will be: Lift(p*V0) = k * 0.62/p^2 * (p*V0)^2 = k * 0.62 * V0^2 = Lift(V0). In...

GregLocock: What law are you using for CL? According to your law if the plane is slowed down to 50%, of what that reference speed might be, then: CL(50%) = .62/0.5^2 = 2.48 also CL(80%) = .62/0.2^2 = 15.5 CL(100%) = .62/0^2 = infinity As you see, the slower the plane flies or slides on the...

GregLocock: If Ro1 = Ro2 (see my previous message) than: Kd2(42+17) = 0.457 * Kd1(33+12) which means that a 5 ft/sec increase in the headwind velocity would have lowered the drag coefficient at 45.7% of what it was when the plane flew in a 12 ft/sec headwind with a ground speed averaging 33...

IRstuff: Flyer II (1904) had no tail elevator and it was not stable in pitch. The Wright Brothers constantly maneuvered the front elevator up and down to keep the plane fly as close to the horizontal as possible, at least this is what they said and how a slightly improved version of the 1904...

Honestly, what Wilbur Wright wrote, in both his Aug. 8 and 28, 1904 letters, about the way his Flyer II machine worked, perfectly fits the behavior of a glider flying along an incline in a headwind blowing parallel to the slope. In such a case, the headwind helps the glider stay in the air due...

I) The second letter, from Aug. 28, 1908 refers to Flyer II in horizontal flight, after the take off. Whatever complications, phenomena may appear at lift off they are no longer present in horizontal flight. That gain in the plane ground speed from 33 ft/sec to 42 ft/sec (see my previous post)...

I have found another letter addressed by W. Wright to Octave Chanute in which the elder of the two brothers again made some odd statements. According to him, in a 17 ft/sec headwind Flyer II reached a ground speed of 42 ft/sec while, flying against a 12 ft/sec wind, the same plane averaged just...

Wilbur Wright: While the new machine lifts at a speed of about 23 miles, it is only after the speed reaches 27 or 28 miles that the resistance falls below the thrust. As long as the resistance is less than the thrust the plane gets a negative speed if the initial speed relative to the ground is...

Something strange regarding the 1904 plane (Flyer No 2) built by the Wright Brothers I am looking for an as simple as possible mathematical model that can explain how it really worked. In 1904, the Wright Brothers started to test a new plane, Flyer II, somewhere near Dayton, Ohio where they...