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).
Accidental crashing issues with hand-controlled Maybach dogs and proposing design modifications.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan008 | |
| Date | 31th March 1931 | |
| HS{Lord Ernest Hives - Chair}/LID.{A. J. Lidsey} FROM DA{Bernard Day - Chassis Design}/HDY.{William Hardy} ORIGINAL DA{Bernard Day - Chassis Design}/HDY{William Hardy}1/M3.3.31. C. to R.{Sir Henry Royce} SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} C. to E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} HAND CONTROLLED MAYBACH DOGS. x2200. We thank you for your HS{Lord Ernest Hives - Chair}/LID{A. J. Lidsey}3/KT26231. giving the difficulties you have experienced with the Maybach dogs on 14-EX. ACCIDENTAL CRASHING. We should like to say that it appears to us that there is no prospect of avoiding the crashing engagements by reduction of face angle alone and that we shall have to radius the leading corners. We have some data from a car we have here (Riley) which may be of interest, and if it is anything to go by, indicates that there is some chance of finding a satisfactory compromise between too easy and insufficiently easy engagement. The top gear dogs of this car are backed off and radiused as shewn by the sketch, and when using them as Maybach dogs they are the equivalent of those for 3rd. speed on 14-EX. WITHOUT RADII, DAMAGE WILL BE DONE TO THE CORNERS WITH SMALL FACE ANGLES. [Diagram annotations]: FACE ANGLE BETWEEN 2º AND 3º RADII ON LEADING CORNERS ABOUT .08 PROFILE AT O/DIA. ENGINE 30º APPROX 3 DOGS APPROX. MEAN RAD. OF DOGS ON 14 EX. WERE THIS DOUBLE THAT OF THE RILEY 6 DOGS WOULD GIVE THE SAME ANGLE OF ENGAGEMENT WITH THE SAME FACE ANGLE [Stamp]: RECEIVED XI 31 MAR 4 SFS (1) | ||