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).
Compression loading tests on three different types of Kestrel forked connecting rods.
| Identifier | ExFiles\Box 179b\3\ img328 | |
| Date | 14th March 1933 | |
| ORIGINAL To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/LBH.{Mr Hall - Aero Design Engineer} c. to Mg. Nor. c. to Bg. K.{Mr Kilner} c. to Hy.{Tom Haldenby - Plant Engineer} EF. Ha/LBH.{Mr Hall - Aero Design Engineer}2/MJ.14.3.33 x3559 KESTREL FORKED CONNECTING RODS:COMPRESSION LOADING TESTS. Tests to discover what distortion the feet of the forked connecting rod undergo, when loaded in compression, have been carried out on the following types of rods :- (1) Standard Forked Rod E.33476. (2) Strengthened type of standard fork rod, having the deepened bolt lugs E.38044 (Mod.145). (3) Curved foot type of fork rod DES.1828. The three types are shewn on Sketch 1. The method of testing was to assemble the rods on a suitable rig, the compressive load acting between the big and little ends. The load was increased in increments of 1 ton up to a maximum of 11 tons, and the distortion of the foot as measured across the bolt lugs in both direction (A.{Mr Adams} & B. on Sketch 2) noted. The maximum load of 11 tons can be taken as that acting in the instant of maximum pressure in the cylinder. The pressure for a standard Kestrel engine is considered to be approximately 700 lbs/in.sq giving a piston load of 6 tons but being suddenly applied, its effect will be about twice this value. Under 11 tons. load, the following results were obtained :- Increase in Major Bolt Lug Dimension (A) Under 11 Tons. Load. Increase in Minor Bolt Lug Dimension (B) Under 11 Tons Load. Std. Fork Rod E.33476. .003 .002 Strengthened Type Std. Rod. E.38044. .005 .0037 Curved Foot Type Rod. DES.1828. .0005 .0005 The above results shew that, under compression, the curved foot rod possesses much more rigidity than the other | ||