FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1943
1943 - 1713.PDF
JULY 1ST, 1943 FLIGHT " Flight " photographs. (Left) Balancing the gyroscope and its gimbal housmg. (Right) The clearance between the air pick-off plate and the suction nozzles (which by relay actuate the controls) is so tiny that a feeler gauge cannot be used. Balanced columns of mercury working under the effect of a partial vacuum show minute differences. SPERRY SCHOOL given instruction in the use of simple gyros by the aid of models. The next stage is to handle a complete set-up which has ailerons, rudder and elevator to show the method of operation and the effect of erroneous adjustment or faults. The pupil, it must be remembered, is already a ' qualified instrument maker or repairer when he arrives, so he is quite capable of handling the next4 stage which consists of completely dismantling a gyropilot unit. He is then given a number of worn or defective parts to incor- porate and has to decide from final test after re-erection which parts are defective and the nature of their defect. If he were maintaining an instrument at a service station he would, of course, draw new parts from store. At the school, however, he is required to make new the parts •'Flight" photograph. Pandora's box. Sgt. Brandreth explains the interior workings of a Sperry O-i bomb sight to a civilian pupil from the Sperry maintenance organisation. " Flight " photograph The famous Sperry O-i bomb sight which legend has it willput a 1,000 lb. bomb in a sauce bottle from 20,000ft. himself in order that he may fully appreciate what these small tolerances mean. The new parts having been made and the instrument finally erected, it is again put on to the test rig. To gain the pupil full marks it must be perfect in every respect, but at least 70 per cent, marks must be obtained before a certificate of pro- ficiency is given. The number of failures to qualify is very small because any . pupil who appears unlikely to make the grade is eliminated in the early part of the course. There is, in the classrooms, every piece of necessary equipment for doing very fine work. Toolmakers' and watchmakers' lathes, face plates, hypodermic syringes for controlled oiling and measuring gauges reading in 1/20,000th of an inch. Each bench has, of course, a glass cabinet wherein dismantled parts can be kept free of dust particles. The organisation and administration of the school are under the care of Mr. D. McNaught, A.M.I.E.E., who is assisted by Sgt. Brandreth, R.A.F., and Mr. A. E Haslehurst.
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
