s per minute, and the
propeller revolutions were reduced by the gearing to 1,200. Fitted to a
'Bristol Badger' aeroplane, the total weight was 2,800 lbs., including
pilot, passenger, two machine-guns, and full military load; at 7,000
feet the registered speed, with corrections for density, was 137 miles
per hour; in climbing, the first 2,000 feet was accomplished in 1 minute
4 seconds; 4,000 feet was reached in 2 minutes 10 seconds; 6,000 feet
was reached in 3 minutes 33 seconds, and 7,000 feet in 4 minutes 15
seconds. It was intended to modify the plane design and fit a new
propeller, in order to attain even better results, but, if trials were
made with these modifications, the results are not obtainable.

The Cosmos 'Lucifer' was a three-cylinder radial type engine of 100
horse-power, inverted Y design, made on the simplest possible principles
with a view to quantity production and extreme reliability. The rated
100 horse-power was attained at 1,600 revolutions per minute, and the
cylinder dimensions were 5.75 bore by 6.25 inches stroke. The cylinders
were of aluminium and steel mixture, with aluminium heads; overhead
valves, operated by push rods on the front side of the cylinders, were
fitted, and a simple reducing gear ran them at half engine speed. The
crank case was a circular aluminium casting, the engine being attached
to the fuselage of the aeroplane by a circular flange situated at the
back of the case; propeller shaft and crankshaft were integral. Dual
ignition was provided, the generator and distributors being driven off
the back end of the engine and the distributors being easily accessible.
Lubrication was by means of two pumps, one scavenging and one suction,
oil being fed under pressure from the crankshaft. A single carburettor
fed all three cylinders, the branch pipe from the carburettor to the
circular ring being provided with an exhaust heater. The total weight of
the engine, 'all on,' was 280 lbs.

The A.B.C. 'Wasp II,' made by Walton Motors, Limited, is a
seven-cylinder radial, air-cooled engine, the cylinders having a bore
of 4.75 inches and stroke 6.25 inches. The normal brake horse-power
at 1,650 revolutions is 160, and the maximum 200 at a speed of 1,850
revolutions per minute. Lubrication is by means of two rotary pumps,
one feeding through the hollow crankshaft to the crank pin, giving
centrifugal feed to big end and thence splash oiling, and one feeding to
the nose of the engine, dropping o