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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).
Standardisation of the low speed jet control cone for the Phantom.

Identifier  ExFiles\Box 171\3\  img260
Date  14th October 1925
  
RR 755 (10H) (SL391 2-11-23) MP 281297
STAMP: ORIGINAL
STAMP: COMPLETED 30.10.25
STANDARDISATION of CHASSIS PARTS
Date 14.10.25
X No. 8080 (struck through) 8240
Drawing No.
Part List

Description of Parts.
LOW SPEED JET CONTROL CONE.

Origin.
R To give better control.

Experimental Test Report.
The control for the low speed jet on the Phantom is too quick. If the control is used for economy, the engine is likely to stop due to low speed jet weakness. It is proposed to alter the taper from 1 in 6 to 1 in 7.5.

Road Test Report.
Fitted to 46-PK - run 1500 miles.
Fitted to 8-EX.
We recommend that this alteration should be adopted.
WATERMARK: PHANTOM

ACTIONS:
A Scrap and replace at all costs, including Chassis already delivered to customers.
B Scrap and replace on Chassis in works.
C Scrap present stock and replace on all Chassis not yet handed to test.
D Use existing stock Alteration effective on future Chassis.

Weight of Old Part. £
Weight of New Part. £
Difference per Car. £

Cost of Old Part. £
Cost of New Part. £
Difference per Car. None.

Cost of Parts in Works which will be scrapped if commenced on:-
Series.........£.........
Series.........£.........
Series.........£.........

Signature of Mr. De LOOZE that above is correct. My/Rns. 16.10.25.

SIGNATURES TABLE
SIGNATURES | DATE | REMARKS
MR. JOHNSON | 30.10.25 | Agreed. C.Johnson.
MR. B. JOHNSON | 30.10.25 | Agreed. B.J.
MR. ROYCE | 23/10/25 | Agreed FHR
MR. WORMALD | 14.10.25 | Agreed. Wor.{Arthur Wormald - General Works Manager}
MR. ROWLEDGE | 15.10.25 | Agreed. Rg.{Mr Rowledge}
MR. DAY | 16.10.25 | Agreed. Da.{Bernard Day - Chassis Design}
MR. BAILEY | 14.10.25 | Agreed. BY.{R.W. Bailey - Chief Engineer}
MR. PLATFORD | 14.10.25 | Agreed. EP.{G. Eric Platford - Chief Quality Engineer}
MR. ELLIOTT | 23/10/25 | Agreed AE
MR. NORTHEY | 16.10.25 | Agreed. PN.{Mr Northey}
MR. HIVES | 28.10.25 | Agreed. E.Hives.
  
  


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