Notes Day 1 National workshop on electric aircraft and allied technologies - 2

 Youtube video link = https://www.youtube.com/watch?v=2xm_8dY0Vgk

 

 Dr B R Pai

1. Hybrid hang glider 
2. weight shift control
3. 100-200km range
4. low stall speed of 55 km/hr
5. Does not need certified engine
6. 1998 Wankel powered hang glider was installed
7. Aeros Ant E trike is single seater, powered hang glider, ukraine, not commercial
8. EMRAX 268 electric motor is good
9. HBC TMM Controller is suitable
10. Battery weighs 11 kg, from epsenergy.com
11. AX4130 couples the engine and motor

Divakar, landing gear, Infosys

1. Pneumatic actuator not used in a/c
2. hydromechanical valves are hydraulic actuators controlled by selector valves or servo valves
1. they have high power density
2. good for flight safe reliability
3. electrohydraulic actuators = hydraulic actuators controlled by electrically signalled selector valves, EHSV
4. Hydraulic actuators reverts to a default damper mode upon failure
5. EHV = elcetro hydro static actuator - power is generated as per demand, signalled by variable speed brushless motor, typically by a constant displacement pump
6. EMA = electro mechanical actuator = dc motor - gearing - ball screw to powr a linear actuator rod, precise control and health monitoring possible
7. EMA ball screw can jam
1. low power density
2. limited to secondary flight controls only
3. require lubrication
   

J Jayadev Vyas - electric ECS system

1. Hot day grounded aircraft with pax and hot day cruise are maximum load cases for ecs
2. 21 kW = estimated heat load of rta, mainly from conduction, convection, metabolic heat
3. ECS system can be 
1. 1 wheel turbine = Dornier 228
2. 2 wheel turbine = saras mk 2
3. 3 wheel turbine = atr 72
4. 4 wheel system = rta
4. Fuel penalty for bleeding hpc air = 1.55 lb/hr for taking 1 lb/min form the hpc outlet
5. system weight of the electric ecs is higher than normal engine bleed based ecs

ASERDC - HAL Lucknow

1. Eelctric brakes are 
1. resistive to oil leakage, 
2. fire
3. weight saving
4. can monitor health
2. high torque motors required to actuate the ball screw that presses brake disk
3.  brake temperature = 1000 degree celsius
4. interface temperature of motor = 150 degree celsius
5. motor stall torque needs to be high
6. Frictional locking of shaft required for parking and for braking
7. Vibhor.asthana@hal-india.com