| The
things people did in their Moths! In the United States
the fair and intrepid Laura Ingalls looped a Moth 344 times
in succession to set some dubious kind of record. People
flew all over the world in them. But surely the boldest
Moth adventurer of all was Francis Chichester, in whose
life the Gipsy Moth has played a big part. A native Englishman
who proved troublesome in his youth, Chichester was shipped
off to the Dominions, New Zealand to be exact, where in
quite a short time he made a small fortune in the timber
business. Returning to England, his pockets jingling, he
took flying lessons and, once he had a license, bought a
Moth. After a shakedown cruise around Europe, but still
with less than a hundred hours of flying time, he set off
on a solo flight for Australia. At this date (1929) only
one other pilot had ever flown solo to Australia. Chichester
made it after some terrifying adventures, which so little
daunted him he next set off to be first across the Tasman
Sea that separates Australia from New Zealand. For this
adventure his Moth was set on floats, and Chichester had
to devise a new technique of astronavigation to find the
two tiny islands which were to be his stepping-stones. In
the lagoon at one of them his Moth sank, but he fished it
up and over the course of a year or so rebuilt it, unaided
by professional hands. It was his intention to continue
on around the world. He got as far as Japan, where a wire
stretched between two hilltops plucked his Moth from the
skies and almost sent Chichester to his grave. For his recent
circumnavigation of the world he chose a sailing boat, but
was faithful enough to his earlier love to christen her
Gipsy Moth III. She was met, sailing into Plymouth Harbor
at the end of her fantastic voyage in 1968, by a Gipsy Moth
airplane, flying low over the waves. One wonders how Sir
Francis felt at the sight.
Where Chichester had led, others followed.
In 1930 an ex-secretary named Amy
Johnson flew another Gipsy Moth to Australia. Her airplane,
registered G-AAAH and named Jason, is to this day hanging
from the ceiling of the National Aeronautical Collection
in London. By the end of 1930 nearly two thousand Moths
had been sold and delivered. The success of the species
was such that de Havilland was to some extent hoist with
his own petard, and obliged to call everything he designed
a Moth. There was the Giant Moth (more of a Giant Myth really),
a big 500-hp biplane transport seating eight in a cabin
pins the chauffeur in a breezy cockpit behind them; the
Hawk Moth, a high-wing monoplane intended for air taxi work
and superficially resembling Lindbergh's immortal Ryan;
and a host of others.
It was soon time to develop the Gipsy Moth
further. The first improvement had been a welded steel-tube
fuselage variant, the Metal Moth, manufactured side-by-side
with the spruce and three-ply structure. Then came wider
let-down cockpit doors and a luggage locker enlarged to
hold a set of golf clubs, for the Moth could land and take
off easily from almost any fairway. An enclosed coupe top
was a popular option on Moths going to Camida. So equipped,
one flew the first air mail iiflo Newfoundland. The Gipsy
Two engine, pulling 120 hp, came along, and so did a strengthened
Metal Moth called the Moth Trainer, intended to whet the
interest of the military. The area most needing improvement
in Moth design-forward visibility-remained. Just where you
wanted to look, while taxiing and during the short takeoff
run, and especially on landing, the sky was filled with
the Gipsy's cylinders and clattering valve gear. Nor could
the engine be lowered without bringing the propeller tips
too near the ground. The solution was to invert the engine,
and this was done in 1930 with the engine called Gipsy Three,
which first powered a new high-wing monoplane, D.H. 80,
soon named the Puss Moth. Upped to 130-hp output, the Gipsy
later became the Gipsy Major, and the Metal Moth, powered
by it, became the Moth Major.
The Tiger
Moth, the most massively successful Moth of all, came
about because the Royal Air Force, while nibbling at the
Moth Trainer, was unhappy about the poor accessibility of
the front cockpit. Service crews all wore parachutes as
a matter of course, and getting into or out of the front,
or instructor's, cockpit of a Moth meant clambering under
the top wing and through the cat's cradle .of supporting
struts and wires. Difficult enough on the ground while you
were wearing a parachute, but quite impracticable if you
had to bail out quickly in the air. Could de Havilland do
something about this? De Havilland, with prospects of a
big RAF order in mind, found that he could. No abstruse
calculations in a design office took place, though. Instead,
a Moth was dismantled in a small shed and jury-rigged as
needed. The top wing was moved forward eighteen inches,
then four inches more. Fine, you could get in and out of
the front cockpit even with a chute strapped to your bottom.
But the center of gravity was now behind the center of pressure.
So all four wings were swept back nine inches at the interplane
struts, the rear spars were shortened, and new struts fitted.
Pencils flew furiously across the backs of old envelopes.
Still not quite enough was the verdict, and so the upper
wings were angled back an additional two inches. That was
it.
After the first few Tiger
Moths had flown (the name was borrowed from the earlier
D.H. 70 racing airplane), it was found that this sweepback
had brought the lower wing tips too near the ground, and
so to raise them the interplane struts were shortened. Which
explains why to this day the lower wings of a Moth have
more dihedral than the upper pair.Thus cut and fitted, an
already sweet-handling design was rendered sweeter, for
the increased dihedral and wing sweep added to the Moth's
lateral stability, as well as vastly improving the pilot's
view. |
| The excellent inverted
Gipsy was installed in other designs, as well: the Leopard
Moth (which had a sad history of structural failures), the
Fox Moth, the Hornet Moth, the twin-engined Dragon, and
so on. (There never was a small aero engine as reliable
as the Gipsy Major. Certainly it is more so than the modern
flat opposed power plants.)
The RAF's order for a new basic trainer
would be large, and de Havillands had plenty of competition
from such now-forgotten machines as the Blackburn Bluebird
and B.2, the Avro Cadet and Tutor, the Robinson Redwing,
and the Hawker Tomtit. Trials were held, supported by a
great deal of advertising from the competing manufacturers
in the aviation press, at the Aeroplane and Armament Experimental
Establishment at Martlesham Heath. Thirty-five D.H. 82 Tiger
Moths were ordered as a result. In retrospect it seems that
one point in the Tiger's favor was that it was not so easy
to fly as some of its competitors, and in truth it does
a creditable job in magnifying many kinds of sloppiness
in piloting technique without allowing them to become dangerous.
The airplane had and still has some obvious faults. "The
shaking and juddering while ticking over," one RAF
instructor noted, "the dreadful aileron control, the
effort required to put up an inverted formation at the Hendon
Display, the difficulty in operating in any sort of wind;
no brakes and the tail skid tearing up great chunks of grass
field!" He might also have commented on the extraordinary
draftiness of the cockpits, but being no doubt a rugged,
outdoors Englishman he probably didn't even notice. |