And oil....
the Gypsy Major Engine in the Tigger is from the 1930s.
It is 6.25L, produced 120bhp....
Drinks 30L fuel/hour AND 1L oil/hour....that is 30:1 and almost 2 stroke consumption!
Lets assume that the aircraft averages 100mph so that is 30L per 100 miles or 15mpg.
It weighs 150kg.
It has to have a full overhaul every 1500 hours.
Compared with a Steve's Healey...
It is 2.9L and produces 150bhp,
Consumes fuel at about 21mpg and no oil.
It weighs, including gearbox, over 300kg....
The engine will need a full overhaul every 50,000 miles, so at a working average of 45mph that is 1100 hours between overhauls.
So, the big Healey is more powerful and more fuel efficient than the Gypsy Major III, but it is almost twice as heavy yet has a longer life between services.
de Havilland produced not just iconic aircraft, but great engines.
