The
aircraft of WWI did not have electronic ignitions and the method of
getting the engine running was similar to how you would start a manual
car by putting it in gear, rolling it down the hill, and the dumping
the clutch. The difference was ground crew would swing the propeller to
engage the engine. But 180hp and 200hp engines have a great deal of
compression; and it often took more than the muscle of one person to
get the propeller turning.
Richard
Williams writes that hand starting was practical for the 90hp and 160hp
engines in the BE2 and Martinsyde's but the 200hp engines of the
squadron's Bristol Fighter meant hand-starting was difficult. The
Bristol Fighter and SE5a were fitted with
magneto type self starters. Williams describes it:
An explosive charge was drawn into the
engine cylinders by rotating the airscrew by hand and that having been
done the ignition was switched on and a small magneto type apparatus
was rotated to create a spark in the cylinders and fire the charge.
When
Williams took over 40 Wing RFC he noticed that the aircrew of No.111
Squadron RFC were still hand starting the SE5a. He writes:
It was obvious the mechanics felt the same
way [as Williams who wouldn't have liked to hand start a 200hp engine]
and I asked the squadron commander why it was being done. He said the
starters were useless. We had gone through this in No.1 Squadron [AFC] and
had found that when properly adjusted the starter was very good. I was
able to arrange attachment of No.1 Squadron's senior electrician to the
SE squadrons, starters were properly adjusted and swinging the airscrew
by hand was stopped to the delight of the little chaps who had been
doing it. Most of them really were little chaps.
The
photo at the top of this article is of an SE5a squadron in Palestine.
It is likely this picture was taken before Williams and No.1 Squadron's
Electricians spent time with No.111 Squadron.
Another solution, in the ongoing absence of an
electrical starter, was to make a mechanical one. The Hucks Starter was
one such solution. It hooked up to a truck and rotated the propeller
mechanically, substituting mechanical power for human power.
However
the Hucks starter had similar limitations to hand starting and could
not deal easily with the increasing compression of more powerful
engines as horsepower output grew.
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