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ju87b2

Junkers Ju 87 B-2

Engine

Junkers Jumo 211 D with blower height = 1500 m

on ground up to 6 km height above 6 km height
rating RPM ata RPM ata
1' 2300 1,35
30' 2300 1,15 2300 1,15
d 2200 1,10 2300 1,10

Powered by Jumo211D with Constant Speed prop. WEP lever present but deactivated. Supercharger operation with nominal height of 1500 m. Auto Dive Recovery and weapon release. Armament Single rearward facing 7.92mm MG 2 x 7.92mm Forward Firing MG, Various bomb types Dive Angle reference lines are scribed on the Right hand canopy pane The aircraft is equipped with the AFN-2 gauge which is utilised for beacon homing and Lorenz approach system

START

  • Fuel Cock Open (Fully Up)
  • Rads Closed (Coolant use Push button, Oil use lever)
  • Prop pitch Full fine (Forward)
  • Start “I”

AFTER START

Warm up with Rads Closed till

  • 38 C Coolant Temp
  • 30 C Oil Temp

Modulate Coolant and Oil rads as required. Suggest full open for Ground operations.

TAKE OFF

  • Flaps Up
  • Prop pitch Full Fine
  • Rads Full Open
  • Lock Tail wheel
  • Set 1.35 ATA (1min Limit)

CLIMB

  • 1.15ATA/2300
  • Rads As required
  • Climb Schedule 215Kmh to 1000m then reduce by 10Kmh per 1000m

DIVE BOMBING

The Ju87 Has a semi automatic Dive Bombing system. This system provides an Automatic Dive recovery after bomb release. The system is engaged when the dive brakes are extended. When this occurs the Elevator trim is biased nose down and held in a nose down position by spring pressure under control of a solenoid. The pilot can allow this action to set the dive or manually enter the dive himself. Manual Elevator trim input must not be used during dive deliveries. Once established in the dive the pilot positions the Sight reticle as required using conventional flight control input.

Bomb Release altitude is a function of dive recovery altitude, Min fuse arming time and frag separation. The minimum altitude that can be set is 25m. Dive recovery system operates. A Contact altimeter is used to initiate weapon release and automatic dive recovery.

The pilot sets the Release altitude* by setting the contact Altimeter needle (RED WHITE needle) to the required release altitude. In the Dive the White altimeter needle unwinds until it brushes past the pre set Contact Altimeter needle. This contact completes an electrical circuit that initiates weapon release and activates the Automatic Dive recovery system. Automatic Dive recovery is accomplished by solenoid action. The solenoid releases the spring lock and the elevator trim is driven to a neutral position, this in turn moves the elevator to recover the aircraft from the dive. The pilot can add additional elevator input if required.

  • Note this is barometric altitude and the pilot must allow for target elevation . For example if the target is on a 650m high hill and you set the contact altimeter to 650m you will impact the target before the automatic dive recovery system can activate. In this example the Contact Altimeter should be set to 1300m. The minimum suggested value above ground level is 650m. This will allow ample time to deal with a failed Auto pull out and to ensure sufficient bomb time of flight for fuse arming and to clear the frag envelope.

At any stage in the dive the pilot can manually release the bombs and this will also initiate the Auto dive recovery system.

The recovery is flown with the Dive brakes extended. As the nose approaches the horizon the pilot selects Dive brakes in. Elevator trim operation is now restored to normal manual function.

DIVE BOMBING PROCEDURE

  • Select Desired Weapons and delivery sequence
  • Ensure the Master Arm Switch is ON
  • Set Required Release Altitude on Contact Altimeter (Target Alt + Desired release height)
  • Supercharger leave in Auto
  • Rads Closed
  • Establish the dive manually or by way of Dive Brake operation.
  • ATA …. set Idle power as the nose drops through the horizon.
  • If manual Dive entry Select Dive Brakes out
  • (no further elevator trim inputs from this point on)
  • Fly the gunsight reticle to the desired aim point.
  • Make sure skid ball is centred.
  • Monitor Altitude in the dive in anticipation of release and Auto recovery.*
  • After Auto Recovery as the Nose approaches the Horizon Retract Dive brakes
  • Set Power as required,Rads as required
  • If Auto release does not occur at the correct altitude immediately press the bomb release button.
  • If Auto recovery does not occur initiate recovery immediately.

In general terms a more accurate pass will be made the steeper the dive Angle. This because the steeper the Dive angle the less allowance needs to be made for Bomb horizontal range. In a perfect 90 degree Angle delivery the pilot simply aims the whole aircraft at the target. Other than wind effect (and of course side slip) the weapon will impact where the nose (Reticle) is pointed… The very essence of the Stuka Dive bomb technique.

APPROACH AND LANDING

  • Approach Speed 155-160Kmh
  • Flaps as required
  • Prop pitch Full fine on final

ENGINE LIMITATIONS

  • Oil Temp 30C min 95C max Rec 85C Min drag @ 20%
  • Coolant Temp 38Cmin 95Cmax Rec 90C Min drag @ 20%
  • 1.35/2300 1 Min
  • 1.15/2300 30Min
  • 1.10/2100 Continuous

AIRCRAFT LIMITATIONS

  • Vmax 600Kmh
  • Vmax_ flaps 220Kmh
  • Vmin_stall 150Kmh
ju87b2.txt · Last modified: 2015/04/03 07:08 by ATAG_Torric270