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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).
Tests to determine power losses in a Phantom II gearbox due to the helical second gear.

Identifier  ExFiles\Box 15\5\  Scan356
Date  2nd December 1932
  
X 7310.

R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}
c. to Sg.{Arthur F. Sidgreaves - MD}
c. to Wor.{Arthur Wormald - General Works Manager}
c. to E.{Mr Elliott - Chief Engineer}
c. to Da.{Bernard Day - Chassis Design}
c. to By.{R.W. Bailey - Chief Engineer}
c. to Hdy.{William Hardy}

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}1/MA. 2.12.32.

HELICAL 2nd. GEAR P.II.

We have carried out some tests to determine the power losses in a Phantom gear box due to the silent 2nd. gear in which the loose pinion is on the layshaft.

The test was carried out as follows in each case the 1st. motion shaft being driven by an electric motor.

(1) In top gear; so that the input power was expended in turning 3 sets of continuous gears.

(2) In Neutral, the 3rd. motion shaft being prevented from turning due to the drag of the synchromesh cones by a measured torque. The input power turns two sets of continuous gears and provides the induced torque on the 3rd. motion shaft.

From these two results the extra power losses of the helical 2nd. gear can be computed.

The gear box was filled to the normal level with engine oil at approx. 50°C.

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}
  
  


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