Sir,—Since the time when the .A.I.A.C.R. has to decide the



new G.P. formula is approaching, I suggest an idea that should give the manufacturers plenty of scope in streamlining, supercharging and fuels—that is, limit the power-toweight ratio.

For instance, a car (maximum speed of 200 m.p.h., acceleration 60 m.p.h. in 15 seconds) weighing one ton would require a horse-power weight ratio of about 250 h.p. per ton, ignoring wind resistance ; but since this makes a great difference at high speeds this would give the manufacturers a puzzle in streamlining.

Another method is the capacity ratio of, say, 5 litres per ton.

But the point is that a direct limit reduces the field of experiment for cars, while a ratio allows no more speed but more scope for large cars and small cars. I am, yours truly,


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