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Jaguar XX730 Krakow
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Ejection seat Martin Baker MK9b

Ejection seat Martin Baker MK9b
October 2007, Duxford
Photos taken by Steve (Bennygman)

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Following photos and text: ©

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After some 23 years of development, the design of the Martin-Baker Ejection Seats was becoming somewhat complex, and towards the end of the 1960 decade a new design was put in hand which eventually became the Mark 9 seats. The general design features of the ejection gun and guide rail, the barostatic time-release unit, the drogue gun and the personal equipment connector were retained, but considerable changes were made to the general seat structure, the drogue container, the parachute and the seat pan. These design changes resulted in a marked improvement in the appearance of the seat and in personal comfort for the occupant. These seats were equipped with power retraction and a completely new gas-operated seat firing system, superseding firing cables and utilising one firing handle only, mounted on the seat pan, the face screen and its firing cable being dispensed with.

Specifications Mk 9 (Jaguar)

Operating ceiling 50 000+ft (15,250 m)
Minimum height/speed Zero/zero
Crew boarding mass range 9B Mk 1, Mk 2 and Mk 3 – 73.0 to 112.0 kg
9B Mk 4 – 65.0 to 135.0 kg
Crew size range 3rd to 98th percentile. As defined in Survey of 2000
Royal Air Force Aircrew 1970/1971
Maximum Speed for ejection 600+ KIAS
Parachute type Irvin IAC 1 24 B/10704
Parachute deployment Drogue assisted
Drogue parachute type Duplex drogues, 22 in. and 5 ft
Drogue deployment Drogue gun. Cartridge generated gas. Initiated
by 0.55 sec clockwork time-delay, tripped by trip rod
Harness type Combined, skeletal torso harness with rip cord
Ejection seat operation type Ejection gun and multi-tube rocket pack
Ejection gun One primary cartridge, two secondary
cartridges, 72.75 in. stroke, 64 ft/sec
Ejection initiation Handle on seat pan initiates gas operated seat
firing system
Electronic Sequencer No
Barostatic time-release unit Yes, with 2 sec delay to give time for speed
to decrease. Trip rod initiated
Automatic back-up unit No
Manual override handle Yes
Guillotine Yes, early variant
Timers Time-release for canopy jettison
Seat adjustment Up/down, actuator operated, 115 V ac motor
Pitch control for rocket motor adjustment to
allow for varying weights of occupant
Arm restraints No
Leg restraints Yes, two garters
Oxygen supply Bottled oxygen
Personal survival pack Yes with liferaft (option)
Aircrew services Intertechnique controller with oxygen flow
sensor and pressure warning
Personal equipment connector (PEC) provides
connections for
– main oxygen
– emergency oxygen
– anti-g suit
– mic/tel
Command ejection No
Canopy jettison Yes, also drogue container is shaped and
strengthened to effect canopy penetration if necessary
Miniature detonating cord No

How it works

Seat firing handle pulled
Harness retraction operated
Canopy jettison initiated
Ejection gun fires, seat moves up guide rails, secondary cartridges fire
Leg restraint cords tighten until the rivets shear
As seat rises, static line initiates drogue gun time-delay
As seat rises, static line initiates barostatic time-release unit
Aircrew services and electrical lead disconnected
Emergency oxygen turned on
Underseat rocket pack initiated
Approx 0.55 sec after ejection, drogue gun fires, 22 in. dia then 5 ft dia drogues deploy to
stabilise and slow seat
Above 5000 m (16000 ft)
– barostat prevents operation of time-release mechanism
Below 5000 m (16000 ft), low speed
After delay of 2 secs to give time for speed to decrease, the barostatic time-release unit operates to –
– release parachute harness from seat locks
– release scissor shackle to release drogues and commence parachute deployment
Main parachute deploys, aircrew separates from seat after being held momentarily by
sticker straps. Action of sticker straps ensures divergence of aircrew and seat
Operation of auxiliary parachute pulls parachute hard shell clear of area
Normal parachute descent
Manual lowering of personal survival pack
Manual initiation of liferaft inflation (when carried)
Manual separation system available if necessary. Operation of manual separation handle
releases parachute harness, negative-g strap, PEC and leg restraint cords. Parachute
withdrawal ine is severed, freeing parachute from seat. Aircrew can then use rip cord to
operate parachute

2 comments to Ejection seat Martin Baker MK9b

  • Gary Hancock

    Hi , I’m looking for a Jaguar PEC, or failing that a close up photo so I can modify a phantom PEC. Also looking for a type 417 man mounted regulator, I have tried the usual dealers and ebay etc to no avail.Not for use on live aircraft, its for a collection / Displasy. Any help you can give is much appreciated.

  • Thomas Solinski

    Greetings from Oklahoma USA!

    I’ve purchased the Kitty Hawk 1/48 Jaguar T.2/T.4. I’d like to finish it as XX830. Can anyone please identify which are the correct part numbers for the correct ejection seats to use in this aircraft? Thank you

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