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[[preprinted]] 
Wright Brothers
Dayton, Ohio

WILBUR WRIGHT
ORVILLE WRIGHT 
[[/preprinted]]

January 13, 1912.

Mr. O. G. Simmons,
Rest Hill,
Wickatunk, N.J.

My dear Mr. Simmons:

Your letter of the 6th instant and also the blue prints of your four cylinder motor are received. I have not as yet had the time to carefully examine the drawings, but at a glance it seemed to me that the weight of the pistons could be reduced to advantage. I think your pistons will be heavier than those in our present motor, which we have found too heavy and are now reducing the weight. The general design looks very good and we will be much interested in learning how the ball bearing connecting rods work. The weight of the connecting rods could be considerably reduced if they were made of steel, but if you are going to use bronze, you will probably do well to leave them in your first motor at the weight shown in your drawings. For high speed motors it is of considerable advantage to keep the weight of the moving parts as light as possible. I believe the walls of the aluminum base could be somewhat reduced and still have all the strength that is necessary in a motor of this size. What is the weight of your fly wheel? The rim looks rather light for a motor of this size. Our