Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911Langley, S. P. (Samuel Pierpont)
History
Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911
Langley, S. P. (Samuel Pierpont)
Aeronautics; Flight
In the flight of June 7 there was a slight trembling of the aerodrome
while it was in the air, and although this was probably due to the
fact that the synchronizing gear was out of operation on account of
the shearing off of one of the pins which held it, allowing the port
engine to run faster than the starboard one, it was thought possible
that some of the trembling might be due to the “wind-vane” rudder,
which had been added to represent the equivalent of a steering device
by which the operator would control the direction of the large
machine. It was decided, therefore, to omit the “wind-vane” rudder in
the present test, but to test the aerodrome with the same equipment
of single-tier wings and Pénaud tail that had been used in the
previous flight, the reel and float being moved to bring the ‹CG› the
same as on June 7.
Everything being in readiness, with the launching track pointed
south, and the wind blowing only about 5-1/2 miles an hour from the
southwest, the burners were lighted and 63 seconds were consumed
before the steam pressure rose to 100 pounds. Although the valve
which controlled the burner was open to its full extent the pressure
showed no tendency to rise above 100 pounds, which was not considered
quite high enough to furnish sufficient power for a successful
flight, but as it was desired to determine at once at how low a
steam pressure the aerodrome would fly successfully, it was decided
to launch it even at this pressure. The launching apparatus was
accordingly released and the aerodrome started off, gliding down
about three feet immediately after being released, and then rising
again, turning slightly to the right and then heading directly for
the Virginia shore, where it seemed that it would smash itself in the
heavy growth of timber, but when it was about 250 feet from the shore
it turned towards the right and started back towards the island.
The wind, however, which was blowing from its rear, evidently got
down the smoke-stack and put out the fire, [p138] for the aerodrome
commenced to descend as soon as it turned its back to the wind, and
came down in the channel of the creek. The path of this flight is
shown by the solid line in Plate 34.
The total distance covered, as measured by plotting the course of its
flight on the coast-survey chart, was about 1800 feet, and the length
of time of flight was 40 seconds. The aerodrome was immediately
recovered and brought into the house-boat, where it was found that
there were still about 1000 grammes of water and 100 grammes of fuel
unused in it, showing conclusively that the fire had been put out by
the wind.
Upon inspection it was found that the aerodrome was uninjured, and
although the burner had not worked at all satisfactorily, yet as the
weather was exceedingly favorable it was decided to make another
trial with it immediately, using the superposed wings.[39]
Public-domain text, read in full here on John Shaqi.
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