MOSQUITO FB VI PILOT'S NOTES

A.P. 2019E-P.N.

British Air Ministry, January 1950

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LIMITATIONS

51. Engine data Marlin 23 and 25

The principal engine limitations are as follows:—

Merlin 25

	Super charger		Boost	Temperature	°C
	gear	R.p.m.	lb./sg.in.	Coolant	Oil
MAX. TAKE-OFF	Low	3,000	+18
INTERMEDIATE 1 HR. LIMIT	Low High	2,850	+9	125	90
MAXIMUM CONTINUOUS	Low High	2,650	+7	105 (115)**	90
OPERATIONAL NECESSITY 5 MINS LIMIT	Low High	3,000	+18*	135	105

* May not be used at r.p.m below 2,850.

** The temperature shown in brackets ny»y be used if necessary for short periods only.

NOTE.—In some aircraft Merlin 23 engines will still be installed. The difference as regards operational limitations from those for the Merlin 25 quoted above are as follows :—

MAX. TAKE-OFF	...	...	+14 lb./sq.in.
OPERATIONAL NECESSITY 5 MINS LIMIT	Low High	3,000	+14 lb./sq.in.* +14 lb./sq.in.*

* Obtainable by use of the boost control cut-out

Merlin 23 and 25

OIL PRESSURE
MINIMUM IN FLIGHT	30 lb./sq.in.
MINIMUM TEMPERATURE FOR TAKE-OFF
OIL	+15°C
COOLANT	+40°C

52. Flying limitations.

(i) Deliberate spinning is prohibited and an incipient spin should be checked by immediate recovery action.

Although aerobatics are permitted at weights below 19.100 lb. without bomb load, underwing stores or wing drop tanks, they are not recommended owing to the possibility of damaging the special equipment.

(ii) The controls are light and effective and care should be taken to avoid excessive accelerations in turns and recovery from dives. At high speeds violent use of the rudder and large angles of yaw must be avoided.

(iii) Maximum weights

Take-off and gentle manoeuvres..20.500 1b.

All forms of flying...... 19.000 Ib.

Landing ........ 20.500 Ib.

(iv) Maximum speeds in knots are:

(a) Without underwing stores or with 2 x 250 or 500 Ib. G.P. bombs with standard wing bomb fairings.

(b) With 2 x 100 gal. wing drop tanks.

(d) With underwing stores.

	(a)	(b)	(c)	(d)
Sea level to 10.000 ft	370	330	350	305
10.000 ft. to 15.000 ft.	350	330	350	305
15.000 ft. to 20.000 ft	320	320	320	305
20.000 ft. to 25.000 ft.	295	295	295	295
25.000 ft. to 30.000 ft.	260	260	260	260
30.000 ft. to 35.000 ft.	235	235	235	235

Bomb doors open ............ 305

Undercarriage down............ 155

Flaps not more than 25° down ...... 175

Flaps fully down ............ 130

(v) (a) Firing of RP is prohibited whilst carrying drop tanks and until at least one minute after they have been jettisoned.

(b) Wing drop tanks should only be jettisoned in level flight without yaw, at speeds between 17S and 260 knots.

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