The M 52's fully floating tail was designed by Denis Bancroft, and this overcame shock and buffeting which was still baffling Bell up to the time that they received crated-up M 52 parts and technical drawings. One of many projects where UK was told a white lie to hide the truth that we were obliged (by our debts to USA for their part in both World Wars) to supply USA with anything they wanted, and to destroy or cancel everything they did not. It amazes me that even though we finished repaying our debts a few years ago we still continue to do whatever they tell us!