The document outlines a proposed ejection mechanism for helicopters aimed at enhancing pilot safety during emergencies. It details the challenges of current ejection systems and suggests a three-stage ejection process incorporating a hatch mechanism, advanced ejection seat, and shock absorber with parachute to ensure a safe landing. The proposal emphasizes the significance of this system in reducing pilot injury and increasing survival rates in military helicopters.

1. THEME:
Ejection Mechanism for Helicopters
Kunal Adhikari
Upamanyu Ray

2. Introduction
There has been an extensive use of Helicopters in the Indian military which
has brought commendable success in the field of defence. The Helicopter
Ejection System that this proposal is going to describe, will help pilots
when they are stuck in a falling bird.
[Example: When there is an control failure or helicopter-to-be-crashed
moments in the air, its difficult for the pilot to get out of the helicopter. The
proposed Helicopter ejection system is capable of get eject, land safely and
deliver the protection to the pilot or soldier.]
P.S: All references used in the word file and ppt, is written under references
in the doc file.

3. Scope of our proposal
● Proposed Safely ejection system reduces risk of injury of the pilot.
● There is a full body protection system in ejection seat helps not to injure
any body part.
● Shock absorber with parachute helps to reach the ground safely, and
counter increased G-force.
● New type of ejection system will be 90% accurate, yet subject to field
tests.
● In history there are many soldiers were dead due to not availability of the
ejection system which will be not happening next.

4. Problems on ejection!
The obvious problem with ejection from a heli is it’s rotor blades.
‘Top ejection’ is not possible very quickly, accompanied by probable error.
1. Depending on the bank angle, ejected rotor blades may hit the main heli
adding to the problems of the falling bird.
2. Ejecting rotor blade first, second pilot may be time consuming and is more
prone to malfunctioning (the success depends on two separate yet compulsory
timed ejections).
3. The explosives used to remove rotor blades, may explode beforehand under
incoming fire, or something. Though its a rare case, lives are at stake here.

5. Problems on ejection!
‘Sideways ejection’ can be considered as a possible solution.
However, the falling bird can bank on any angle whatsoever,
which makes it dead-dangerous in the critical bank angles
(>45osideways). Also for a utility heli, or multiple
pilot/passenger helis, there rises a dilemma of “I go first or
you?”

6. 1. But a pilot is flung from a helicopter
into the harsh terrain with a
speed of 275 to 325kmph + ejection
blast-off speed.
2. There is also a high probability that seat flung
would collide with the blades.
3. There is also a possibility of incoming fire (on both front and
sideways)
'Frontward Ejection' seems
more safe, true.
Problems on ejection!

7. Challenges
A ‘Downward ejection’ seems more feasible, as a result. The main
challenge in downward ejection is the increased G-force on the body,
and blood not being able to reach the brain.
In general, challenge faced by any ejection seat is to ensure that there is
little to no risk of pilot injury (or, as low as possible).

8. Challenges
Russian/Soviet attack choppers are specifically designed to attack
infantry rather than armour/artillery/ships, hence the average
engagement altitude is 50 feet to 200 feet.
India mostly uses Russian/Soviet mod aircrafts, such as Mi-24 and
HAL-DHRUV(and variants Rudra, LCH)
The challenge here is the low altitude, big issue as helis do not fly
high, be it utility, medevac, or attack, posing a problem for parachute
opening.

9. Mechanism
The Mechanism of ejection system will be divided into 3 parts-
1. Pre Stage:-When helicopter will be not in control, the latch will be pulled and a hatch
below of the ejection seat will be opened perfectly with 100% accuracy and a designed
ejection seat will go downward of the helicopter through gravitation.
2. Ejected Stage:-When body will come out of the helicopter then that fall to earth with
gravitational law and g-force affect the body of the pilot; so for saving his body from
injuries the body safety guard mechanism will be activated on pulling the latch.
3. Falling Stage:-The pilot will come downward due to a thrust and gravity. Then the Air
Bag in form of shock absorber which contains a gas (heavier than air) will be inflated,
with a parachute and a capsule to send the pilot safely to the ground.
Solution!

10. Hatch Mechanism Of Helicopter
To make this endeavour successfully we need to change just a system of
helicopter. A type of mechanism positioned in just down of the ejection seat
which helps the pilot to get out of helicopter when needed without any
challanges and removing the main problem rotating blade from the thinking.
The Hatch will open like a window, not a sliding door, so that it has
the provision to hold sensors/weapons underneath it.
The Hatch will be opened only in emergency case means when the
latch will be pulled only then hatch will be opened with pulley/hydraulic
System (or any other accurate system, for that matter)

11. Ejection Seat
Ejection Seat will be highly developed seat with full body
Protection system. There is a mechanism that, when the latch will
be pulled then immediately the hatch will be opened and a press
throttle present in will help the ejection seat go downward.
Without any challenges and the full body protection system
will start running and in the falling moment from a
calculated distance the Parachute and Air bag as in
Shock Absorber filled with gas will be opened and help
the Pilot too reach the ground safely.

12. Shock absorber with Parachute
Pilot needs to be alive when he will reach the ground. For that reason there is
needed a safety assurance which can help the ejection seat reach the ground
safely with its special functioned mechanism.
When the ejection seat comes out of the helicopter and falls downward, then
in a calculated distance the shock absorber will be opened to protect the body
and thereafter, the parachute from the ejection seat. The parachute will help
to slow down the acceleration due to gravity, and provide cushioning against
massive G-force.

13. Summary...
Till now, the entire process was broken down into three segments, Hatch Mechanism,
Ejection Seat and Shock Absorber with Parachute.
The summary and continuous event is described:
Need to eject -> Latch is pulled -> Hatch opens -> Seat takes it’s protective cover
(Neck, head, legs) + Thrust is given to seat -> Seat(with pilot) falls down -> Air bag
inflates on tug from wire -> Cushioning from G-force -> Parachute(Base rig) opens on
tug from wire -> System reaches ground safely.
All the events (separated by arrows) is designed and timed to happen one after the other,
without any break.

14. Upamanyu Ray Kunal Adhikari