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The English have used a thrust meter to advantage in helping to evolve characteristics full flight data.

Other research work is being carried on at present in the form of increasing controllability of airplanes at low speeds, endeavouring to attain efficient control disposition,  Further investigations will be carried out in the near future on the comparison of water-cooled and air-cooled engines from the standpoint of consumption of power for cooling.  Cooling with radiators will be compared to direct air-cooled cylinders.  The direct merit factor as regards water-cooled versus air-cooled power plant installation in a hypothetical airplane will be tested to determine the choice from a view point of the total resistance of the machine in each case.

Their research department is investigating the problems of control at low speeds and the solution of this problem may, in their opinion, give more advantage than the development of wings of high lift.

STABILITY DATA.

A considerable amount of work on stability derivatives for prediction of stability characteristics of aircraft is being

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