They did not compare with the Wright Bros, but with their 5 blade prop. The Wright Brothers propeller was extremely inefficient at the speeds the test plane is

They did not compare with the Wright Bros, but with their 5 blade prop. The Wright Brothers propeller was extremely inefficient at the speeds the test plane is flying, so don't take the 90% number at one speed and compare it blindly with a very different speed and behavior. Did the Wrights have cavitation or supersonic tip of the blade speeds?