Dayton, March 26, 1905
Your letters of March 16th have been rec'd. Many thanks for the original English of the passage of the Moedebeck handbook. We wished to set up a claim that the word verziehen, i.e., distort, did not necessarily imply a "twisting" movement, and thought it well to make sure that you had used some other word than "twisting" in the original. I think we will win out unless the German examiner is unreasonable and stubborn. The only part of the chapter on aviation which we have in English is the section headed " Computations. "
It is quite true that the formula wv/ac is neither complete nor exact, as both terms in the denominator vary at different speeds; but as the screw becomes more efficient as the velocity increases, the bad effect of increased head resistance is largely counteracted and the formula remains approximately correct. A complete formula would probably cover a whole page.
I notice that you say that wings are more efficient than screws because they "utilize the currents produced by the upstroke." I am at a loss to understand how this can be.
The fact that we already have a camp at Kitty Hawk would give that place a preference over the Dune Park grounds. Our chief objection to the Huffman Prairie grounds is not the lack of seclusion but the lack of room. We need a place where we can start at the building and fly in any direction.