From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specification for a dummy model Armature to test the winding feasibility for the 'Goshawk' II design.
| Identifier | ExFiles\Box 35\4\ scan 032 | |
| Date | 17th August 1921 | |
| To ING. C. to EB. examine. EFC X4384 EXPERIMENTAL FC BY/ARE/EM 17. 8. 21. RECEIVED X.4384. "GOSHAWK" II - R.R. DESIGN OF It is required that a dummy model Armature, with complete Winding be produced in order to see whether the winding can be wound into the estimated space. The following parts will be required:- D.50206 Winding Lay-Out. D.50211 Dummy Armature - 1 off. West WitteringHenry Royce's home town ask for this Dummy to be made in wood, presumably mahogany, but for ease of cutting the slots perhaps you would prefer to use an alloy. D.50212 Slot Lining - 29 off. D.50213 Slot Separator - 29 off. D.50214 Banding Wire Insulation -18 off. (This part can be cut from F.{Mr Friese} 6547). F.{Mr Friese} 6546 Banding Wire Clip - 12 off. Banding Wire - 3 bands each consisting of 15 turns of No. 25 S.W.G. (.020) Steel Banding Wire, total length required - 35 ft. (This wire is the same as used on the standard S.S. Motor Armature). Winding - Copper Wire No. 14 S.W.G.(.080) double cotton covered - total quantity required - 56 ft. Super Fine Dynamo Tape .005 thick x .250 wide total quantity required - 116 ft. When ordering the above wire and tape it would perhaps be desirable to order more than the above quantity, in order to avoid delay when the time comes for winding actual Armatures. It will be noted that on D.50206 we give maximum and minimum dimensions of the overhang of the End Winding. It was first estimated that the winding could be wound up to the dimensions given as the minimum, but, after going into the matter more thoroughly and taking into consideration the variations that are bound to occur on production, such as varying thickness of the coils after taping and the desirability of not having a "tight" winding, it is not thought wise to cramp the overhang into less space than the dimensions given on D.50206 as the maximum. It is the actual proof of this that we require and until this is known we are not issuing those mechanical details of the motor such as Shaft, Frame etc., which would be affected by any change in the overhang of the winding. Contd. | ||