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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).
Study of spark plug electrode erosion, comparing coated vs. uncoated nickel and different noble metal coatings in a Kestrel engine.

Identifier  ExFiles\Box 58\2\  Scan171
Date  6th December 1933
  
S.P. 272.

Issued by:-
Directorate of Technical Development.
AIR MINISTRY

DRC No E&I 4905.

DEPT: ELECTRICAL & IGNITION.
DRAWN: W.R.D. 6-12-33
TRACED: N.A.H. 5-12-33
CHECKED: W.S. 6-12-33
APPROVED: C.E. Sounds 6-12-33

FIG 1.
TESTS AT NORMAL TEMP. AND PRESSURE.
SHOWING EROSION OF A PLATINUM COATED & UNCOATED NICKEL ELECTRODE.

GRAPH 1:
Y-AXIS: GAP INCREASE IN INCHES X 10^-3
X-AXIS: HOURS OF TEST, SPARKS PER GAP
S.C.12 MAGNETO AT 2500 R.P.M.
6 H.T. + LEADS CONNECTED.
250 μμ FDS.
NICKEL (UNCOATED)
PLATINUM COATED NICKEL
ELECTRODES .1" DIAMETER AT 90°
INITIAL GAP = 1.5 M.M.

DIAGRAM:
ELECTRODES 0.1" DIAM.
SPARK GAP 1.5 M/M.{Mr Moon / Mr Moore}

FIG. 2.
RESULTS OF TESTS IN KESTREL ENGINE II M.S.

GRAPH 2:
Y-AXIS: GAP INCREASE IN INCHES X 10^-3
X-AXIS: HOURS OF TEST, SPARKS PER PLUG.
PALLADIUM COATED KLG. V.7 (EXHAUST) (2 POINT PLUG.)
RHODIUM COATED KLG. V.7 (INLET) (2 POINT PLUG.)
EXHAUST STANDARD LODGE A2 SINGLE POINT.
INLET STANDARD LODGE A2 SINGLE POINT.
PLATINUM COATED LODGE A2/1. (EXHAUST) (2 POINT PLUG.)
PLATINUM COATED LODGE A2/1. (INLET) (2 POINT PLUG)

E&I 4905
  
  


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