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Flying Spit MkI need help

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?

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

Quote:

Originally Posted by 41Sqn_Stormcrow (Post 431343)

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.

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Historical reference: AP 1564A Hurricane I Aeroplane Merlin II Engine - Notes concerning the Merlin II engine

Code:

(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.

[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.