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).
Comparative analysis of propeller shaft joint specifications for the Ph.III model.
| Identifier | ExFiles\Box 94\4\ scan0118 | |
| Date | 30th May 1936 guessed | |
| COMPARISON OF PROPELLER SHAFTS FOR PH.III. Ph.III Engine Torque - 3700 ins/lbs. 1st Speed Torque - 10000 ins/lbs. | | Hardy Spicer Joint as on Bentley. | Hardy Spicer B.Series 1350. | Mechanics. Ph.III. | |---|---|---|---| | Overall dimension of Joint dia. | 3.500" | 4.200" | 4.300" | | Dia. of rollers = d2. | .125" | .125" | .125" | | Length of rollers= l | .400" | .550" | .625" | | Dia. of pin. = d.{John DeLooze - Company Secretary} | .600" | .675" | .500" | | Mean Radius of Rollers = R.{Sir Henry Royce} | 1.125" | 1.400" | 1.575" | | Load on each pin. Max. | 4450 lbs. | 3670 lbs. | 3180 lbs. | | Stress at Base of Pin. Top. | 15,500 lbs/sq.in. | 13,600 lbs/sq.in. | 30,000 lbs/sq.in. | | -do- 1st. | 42,000 " | 32,600 " | 81,000 " | | Mean dia. of splines. = b. | 1.250". | 1.250". | 1.850". | | Length of splines. = L | 2.250" | 2.400" | 2.125. | | Dia. of neck. = c. | 1.125" | 1.150" | 1.250" x .837" BORE | | No. of bolts per flange. | 4 | 4 | 6 | | Dia. of bolts. | .375" | .375" | .312". | | Bolt Centres dia. | 3.125" | 3.750" | 2.750". | | Load per sq.in.of projected area. Max. d x l | 18,500 lbs/sq.in. | 9,900 lbs/sq.in. | 10,200 lbs/sq.in. | Loads for all shafts are with P.III torque. | ||