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1. General Requirements.

The aircraft is to be a Vickers "Vimy Commercial Type modified so as to fulfill the duties of "Ambulance Aeroplane", and is to be generally similar to the experimental "Vimy" Ambulance, except as hereinafter stated.

The aircraft is to be designed to carry the full equipment specified in paragraph (6) or this Specification.

The aircraft must have a good degree of positive stability in all directions.

The aircraft must be controllable at all flying speeds. The standard "Vimy" Commercial elevator controls must be so modified as to give increased elevator movement.

The passengers' compartment is to be equipped as specified in paragraph (7) of this Specification.

The arrangements for landing and taking off are to be as specified in paragraph (8).

The aircraft is to be constructed in conformity with the drawings approved by the Director of Research or his representative.

2. Power Unit

The engines to be installed are Napier "Lions" of which

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