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).
Experimental bench tests for a B.T.H. Type F.M.6 Magneto.
| Identifier | WestWitteringFiles\F\March1921\ Scan47 | |
| Date | 18th March 1921 | |
| To R.{Sir Henry Royce} Er E.{Mr Elliott - Chief Engineer} from EFC c. to CJ. & PN.{Mr Northey} c. to Da.{Bernard Day - Chassis Design} & EP.{G. Eric Platford - Chief Quality Engineer} c. to Bn.{W.O. Bentley / Mr Barrington} & By.{R.W. Bailey - Chief Engineer} c. to EWT. for R.R.Inc. ORIGINAL EFC3/T18.3.21. X.3515 - B.T.H. Type F.M.6 MAGNETO. REPORT OF EXPERIMENTAL BENCH TESTS. Two of the above magnetos were received at these Works on 3.2.21. A short preliminary report was sent under cover of our EFC2/T10.2.21. One of these magnetos has now been put through our experimental bench tests with the following results :- Magneto No. 311941. 1. Weight - 10.25 lbs. 2. For remarks re mechanical and electrical design see preliminary report. We have already sent to Mr. Royce a similar machine to the one which has been through the experimental bench tests loosely assembled to enable him to examine this. 3. Radial air gap - .003" between sleeve and armature, and .001" approx. between sleeve and main pole. 4. High tension safety gap - 7.6 mm. 5. The jump spark distributor dimensions are according to sketch herewith :- 1.026" .255" .270" Overlap X at advance = .10" " " retard = contd. R.R. 386A (100 T) (S.H. 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 | ||