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).
Choice between long or short connecting rods for the Lighter Phantom Engine.
| Identifier | ExFiles\Box 65\4\ scan0288 | |
| Date | 19th April 1926 | |
| HS.{Lord Ernest Hives - Chair} X8030 BY3/H.{Arthur M. Hanbury - Head Complaints} 19.4.26. LIGHTER PHANTOM ENGINE. RE LONG OR SHORT RODS. We read E3/M.{Mr Moon / Mr Moore} 15.4.26. as meaning that E.{Mr Elliott - Chief Engineer} wants Works to say definitely whether the long rods or short rods should be used in the lightened Phantom designs. From a testing point of view, it is certain that the lighter Phantom engine will result in considerably increased torque re-action effects, owing to the reduced control or minimising effect of a high force resulting from a big mass being introduced between the force in question and the frame, in an exactly similar manner as the piston smooths out the explosion curve of the engine when plotted as a diagram of pressures on the crank. At the moment we are going on with long rods, as this appears to be a reasonable attitude to adopt, particularly in view of the fact that you found, even with the heavy engine, benefits by going to the long rod from the short one. BY.{R.W. Bailey - Chief Engineer} By | ||