Flying Spit MkI need help

[Bloblast]

10 minutes after take off the engine always breakes.
Do not know why radiator full open, prop pitch low setting, no overheating

Does anyone know?

[41Sqn_Stormcrow]

RP should never exceed a certain amount. IIRC 30 000 rpm is ok but not more

[Bloblast]

RP should never exceed a certain amount. IIRC 30 000 rpm is ok but not more

Never exceeded 30k RPM, I do only full throttle on take off. I am in normal flight when this happens. Really do not understand.

[41Sqn_Banks]

Basic guideline:
- Keep engine speed below 2,600 RPM.
- Keep oil temperature below 90°C
- Keep water temperature below 95°C
This are not the absolute limits, higher values might be possible, maybe only for limited time.

Historical reference: AP 1564A Hurricane I Aeroplane Merlin II Engine - Notes concerning the Merlin II engine

(i) Limiting operational conditions.-

Take-off Maximum r.p.m. 2,850*
(up to 1,000 ft. Mimimum r.p.m. at
or for 3 mins.) maximum boost 2,080
(+6¼ lb./sq.in.)

Climb Maximum r.p.m. at
maximum boost 2,600*
(+6¼ lb./sq.in.)

Maximum cruising Maximum r.p.m. at
(mixture control maximum boost 2,600
"Rich") (+4½ lb./sq.in.)

Economical Maximum r.p.m. at
cruising maximum boost 2,600
(mixture control (+2¼ lb./sq.in.)
"Weak")

All-out level Maximum r.p.m. at
(5 mins. limit) maximum boost 3,000
(+6¼ lb./sq.in.)

Maximum dive Momentary maximum
r.p.m. at maximum
boost 3,600
(+6¼ lb./sq.in.)

*These r.p.m. will not be obtained with a fixed-pitch airscrew.

[...]

(iii) Oil inlet temperatures.-

Maximum for opening up 15°C
Maximum for continuous cruising 90°C
Maximum for climbing 90°C
Emergency maximum 95°C
(5 mins. limit)

(iv) Coolant temperature.-

The engine which employs ethylene glycol as the
cooling medium, should not be opened up to full
power until the radiator temperature exceeds 70°C.
The maximum permissible temperature in flight is
120°C and the recommended cruising temperature
should not exceed 95°C.

[Bloblast]

[QUOTE=41Sqn_Banks;431354]Basic guideline:
- Keep engine speed below 2,600 RPM.
- Keep oil temperature below 90°C
- Keep water temperature below
This are not the absolute limits, higher values might be possible, maybe only for limited time.

OK thanks, keeping the water temp under 95°C is the bottleneck.
Keep checking that and it's okay.