De Havilland DHC-1 Chipmunk for X-Plane 10 by Khamsin
Flight manual
DESCRIPTION AND MANAGEMENT OF SYSTEMS
The Chipmunk is designed as a basic trainer aircraft. It has a fixed undercarriage, fully castoring tailwheel, brakes aud full dual control. The tandem cockpits are enclosed by a single hood. The fuselage, tail fin, tailplane and leading edges of the wings are metal covered; the rest of the wings and the control surfaces are fabric covered.
The aircraft is powered by a Gipsy Major Mk. 8 engine, driving a two-bladed, fixed-pitch, metal propeller.
The principal dimensions are as follows:
- Span 34ft. 4ins.
- Length 25ft. 5ins.
- Height 7ft. 0ins.
Fuel system
1 Fuel tanks and venting
Tanks and fuel feed
Fuel is carried in two flexible 9-gallon tanks, one in each wing. From the tanks the fuel flows by gravity, via non-return valves, to the single fuel cock and thence to the two engine-driven fuel pumps.
Venting
The two tanks have a common vent on the underside of the fuselage. The vent fairing on the upper surface of each wing has a small hole on its starboard side, to prevent siphoning.
2 Controls and indicators
Fuel cock
The fuel cock is operated by either of two mechanically interconnected ON / OFF levers, one in each cockpit, to the left of the control column.
Fuel gauges
A float-operated, direct-reading fuel gauge is on the upper surface of each wing, next to the filler cap. When the aircraft is in a tail-down attitude, i.e. on the ground, the contents are given by the red figures; in level flight, the white figures give the contents. In flight, the gauges can only be read accurately from the front cockpit.
3 Management of the fuel system
The fuel cock should be set fully on (forward) before starting and must remain in this position at all times when the engine is running.
4 Engine
Gipsy Major Mk. 8, general
The aircraft is powered by a four-cylinder, air-cooled Gipsy Major Mk. 8 engine, driving a two·bladed. fixed pitch propeller. The engine develops 145 BHP at sea level in ISA conditions. Two engine-driven fuel pumps are provided and the engine also drives a generator and a vacuum pump.
5 Throttle and mixture controls
Throttles
Interconnected throttle levers are provided, one in each cockpit, The lever moves in a quadrant divided into two sections, marked ECON CRUISING and POWER JET IN.
Mixture control
A mixture control lever is in each throttle quadrant and is moved forward to weaken the mixture.
6 Carburettor air-intake control
The carburettor air intake is controlled by inter-connected CARB AIR, HOT/COLD levers, one on the starboard side of each cockpit. When the lever is in the COLD (forward) position, air is fed to the carburettor through a scoop in the starboard engine cowling. The lever is moved aft to select HOT. With HOT selected. the carburettor is supplied with warm air from inside the engine cowling.
7 Starting and stopping controls
A pair of ignition switches is provided on the port wall of each cockpit; both pairs must be ON while the engine is running and the engine may be shut down from either cockpit.
8 Oil system
A 2 1/2 gallon oil tank (which includes a 1/2 gallon air space) is forward of the engine bulkhead. A dipstick is embodied in the filler cap, which is under the starboard cowling. A scoop in the port cowling passes air through a cooler in the tank.
9 Engine instruments
An RPM indicator is provided on the left-hand side of the instrument panel in each cockpit. An electrically-operated oil temperature gauge and a capillary-type oil pressure gauge are on the right-hand side of each instrument panel.
MAIN SERVICES
10 Electrical system
A 500-watt, engine-driven generator charges the batteries and supplies DC for the following services: lighting, radio, pressure-head heater, oil temperature gauges.
(i) Two 12-volt, 15 AH batteries, connected in series, are housed in the rear fuselage and supply the aircraft services (except the pressure-head heater) when the generator is not charging.
11 Management of the electrical system
If the generator fails, the batteries will supply the aircraft services. Transmissions should be kept to a minimum and, at night, the emergency lighting should be used instead of the normal cockpit lighting.
12 Vacuum system
An engine-driven vacuum pump provides suction for the gyro—driven instruments, i.e., the artificial horizons, the directional gyros and the turn and slip indicators.
Aircraft controls and flight instruments
13 Trimming
Trim tabs are incorporated in the rudder, the starboard aileron and the starboard elevator. The rudder and alleron tabs are only adjustable on the ground; the elevator tab can be controlled in flight.
The elevator trim tab is controlled by a handwheel on the port side of each cockpit. The wheel is labelled UP/NOSE-DOWN and is so marked that all nose-up trim positions are black and all nose-down trim positions are white, the setting being read against the top of the wheel casing.
14 Flaps control
Flap operation is controlled by a 3 position lever on the starboard side of each cockpit. UP (fully forward), 15° (mid position) or 30° (fully aft) may be selected. No flaps position indicator is provided, as the flaps are easily seen from both cockpits.
15 Wheel brakes
The wheels are fitted with hydraulic brake units; a master cylinder for each wheel is supplied with fluid from a reservoir on the forward face of the firewall.
The brakes are controlled by a lever on the port side of each cockpit. With the lever ON, equal braking is applied to both wheels when the rudder is central; differential braking is obtained by setting the lever to an intermediate position and operating the rudder pedals.
16 Flight instruments
Pitot-static system and associated instruments
A combined pitot-static pressure-head under the port wing supplies pressure for the ASI, RCDI and altimeter in each cockpit. The pressure-head is electrically heated; supplies to the heater are controlled by the rearmost switch on the switch/fuse box in the front cockpit. The heater will only operate when the generator is charging.
Gyro-operated instruments
The gyros for the artificial horizon, the directional gyro and the turn and slip indicator in each cockpit are operated by suction from the vacuum system at 4 1/2 InHg.
Compass
A P.11 compass is provided in each cockpit, on the floor forward of the control column
General equipment
17 Hood
A single, sliding hood covers both cockpits. There are two extemal handles, one for each cockpit, on the top port side of the hood; these are connected to corresponding levers inside.
18 Internal lighting
The instrument panel is illuminated by two lamps, comtrolled by a dimmer switch on the switch/fuse box;
19 External lighting
The navigation lights are controlled by a NAV LTS ON switch on the switch/fuse box.
The taxying lamp on the port undercarriage leg is controlled by a TAXYING LAMP, ON switch on the switch/fuse box.
Part II- LIMITATIONS
1 General
The Chipmunk T. Mk. 10 is cleared for use as a training aircraft. subject to the limitations given in the following paragraphs.
Airframe limitations
2 Speed limitations
Maximum permissible speed : 173 knots
Maximum speed for flap operation:
- between up and half (l5°): 93 knots
- between half and full (30°) 71 knots
Speeds for flap operation also apply to flight with the flaps lowered.
WARNING: Care must be taken in manoeuvres at speeds above 100 knots, as it is possible to exceed the limitation of +5G.
3 Spinning and aerobatims
Spinning: Practice spins of up to eight turns are permitted.
Aerobatics: Aerobatics are permitted but inverted flying is prohibited.
4 Weight
Maximum AUW for all permitted forms of flying: 2,100 lb.
Engine limitations
5 Principal engine limitations, Gipsy Major Mk. 8 (fixed pitch propeller)
| Condition | Time limit | Max. RPM | Max. oil temp. C° |
| Max.take-off | 5 mins. | 2,550* | 100 |
| Max, rich | Unrestricted | 2,400 | 85 |
| Max. weak | Unrestricted | 2,300 | 85 |
| Max. diving (1/2 throttle) | 20 secs. | 2,675 | — |
*Cannot be obtained on take-off or on climb at recommended speeds.
6 Oil limitations
Pressures
- Normal: 40-45 PSI
- Flight emergency minimum: 30 PSI
Minimum temperature for opening up 15°C.
Khamsin - © 2013