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ju88a1

Bold TextJu 88 index: General, Features, Start Up, Take Off, Climb, Cruise/Landing, Auto Pilot, Fuel System

Ju88 Quick Start Guide

Engine settings:

Rating ata RPM
Takeoff 1' 1.35 2400
Climb 30' 1.15 2300
Cruise d 1.10 2100
  • Coolant: Max 95/ normal 85-90 degrees C. Water rad min drag @ 20% open.
  • Oil: Max 95/ normal 75-80 degrees C. Oil rad min drag @ 20% open.
  • Supercharger: Manual shift @ 1220 m

Ceiling:

  • Full internal bombs and fuel is 7300m
  • Post target with 50% fuel is 8000m

Speed:

Rating vmax @ SL
1' 420 km/h
30' 370 km/h
d 365 km/h

Dive Speeds:

From 0-2000m 675 km/h
From 2-6000m 600 km/h
With dive brakes 0- 6000m 575 km/h

GENERAL

The Ju-88 was designed as a twin engine high speed bomber that became one of the most versatile bombers in the Luftwaffe and was called “The Maid of all Work” (probably a feminine version of “Jack of all Trades”). The A-1 is capable of level bombing, glide bombing, and dive bombing just like a Stuka. It is capable of carrying a 2400 Kg bomb load: 28 - 50 Kg. bombs internally with 4 - 250 Kg. or 2 - 500 Kg. bombs externally. Its 4 man crew consists of a pilot; bombardier/nose gunner; top and ventral gunners.

FEATURES

The Ju-88 has two Jumo 211-B-1 engines that use a variable pitch prop controlled by an electric motor. (New feature: Prop pitch is controlled by the pilot at all times) It has a two mode autopilot that controls just the rudder in mode 1 (course); or controls rudder, aileron, and elevator in mode 2 (22) for level bombing. This bomber also has dive brakes that let you dive bomb at high angles with an automatic pull-out for pin-point accuracy. The 88 is equipped with aileron, rudder, and elevator trim.

START UP

  • Set the altimeter to field elevation.
  • Set throttle to 5%.
  • Prop pitch to 12:00 as seen on the engine nacelles.
  • Open #1 and #2 fuel cocks and set to both.
  • Select engine “1” and start.
  • Select engine “2” and start.
  • Once both engines are running, select all engines.
  • Once water and oil temps. reach 40 degrees open the oil radiator to 50% and the water radiator to 50% (Oil temps. gauges are located on engine nacelles).
  • Set fuel contents gauge selector to #3 inner tanks (Right horizontal panel).
  • Gun sight illumination “on”, set for sunlight conditions.
  • Set trim for take-off: 5 clicks of up trim, 6 clicks of left aileron, and 6 clicks of right rudder (control located on the left wall above the throttles).
  • Read repeater compass course and set directional gyro to match.
  • Set course setter to desired course. Note: Course setter is a visual aid to stay on course, it does not affect the autopilot or the repeater compass.
  • Set course autopilot pre-set to desired course (+/- 3 degrees offset).
  • Taxi to runway .

TAKE OFF

  • Once lined up on the runway, open water and oil radiators to 100%.
  • Advance throttle to 100%. Take off power is rated for 1 min @ 1.35 ATA @ 2400 rpm (red line).
  • Use rudder to keep nose pointed towards the end of the runway.
  • The tail will rise by itself.
  • Rotation speed is @ 185 km/h - gently pull back on the stick to lift off the runway. (NOTE: Do not exceed 200 km/h as a tire will blow out.)
  • Once wheels are off the ground, retract landing gear.

CLIMB

  • Reduce power to 30 min rating which is 1.15 ATA @ 2300 (orange line).
  • Turn to your course heading and set an attitude for the best climb rate @250 km/h.
  • Monitor water and oil temperatures to keep in the proper range.
  • Engage supercharger @ 1300m. (Note: Supercharger can be put into “automatic” mode by engaging it at any time. It will turn on or off based barometric pressure, however be cautious as you could blow a motor if it engages at high engine output).
  • Maintain cruise engine settings for up to 30 min or cruising altitude is reached.
  • Notice that @ 3500 m your ATA will start dropping off, add throttle to maintain 1.15 ATA.

CRUISE

  • Once desired altitude is reached lower your engine settings to cruise power which is 1.10 ATA @ 2100 rpm for the continuous setting (green line).
  • Monitor water and oil temperatures.

LANDING

  • Approach at 200 km/h.
  • Prop at 12:00.
  • Flaps full down.
  • Gear down – confirm landing gear down on gauge.
  • Final at 180 km/h.

AUTOPILOT

  • To engage the autopilot, turn to the desired course using the repeater compass. (Ex. 342 deg)
  • Once course and desired attitude are achieved, trim aircraft.
  • Realign directional gyro (Ex. 342 deg) to the repeater compass and make sure autopilot pre-set is set to +/- 3 degrees of desired course (Ex. 344 deg) Note: directional gyro will drift during flight, so you will have to update it periodically.
  • Turn the autopilot to mode 1 (course). The rudder pedals will engage and keep the plane on course. You will still have aileron and elevator control. You can use the ailerons to help even out the swaying back and forth that may occur when first engaged or when updating the directional gyro to the repeater compass. If the slipball is off center, use aileron trim to get it centred. Use elevator trim to control flying level, climbing, or diving.

To turn with the autopilot engaged, change course using the autopilot pre-set and the plane will turn to the new course. Use small adjustments. Turn the autopilot to mode 2 (22) and elevator, rudder, and aileron will be controlled by the autopilot. The plane will try and maintain 320-330 km/h, as this is used for level bombing so the plane will descend to get this speed.

FUEL SYSTEM

The Ju88 has 4 wing tanks. At 50% or less, just the inner tanks will have fuel in them (# 3 on the fuel switch). Between 51% and 100% fuel will be held in the outer tanks (#2 on the fuel switch. #4 and #5 are oil tank levels seen in the right gauge). The engines only pull fuel from the inner tanks so if more than 50% is taken, fuel must be transferred from the outer tanks to the inner tanks.

  • Transfering fuel: click on fuel cocks #6 and #7. #6 pulls fuel from the left outer wing tank and transfers it to both left and right inner wing tanks. #7 pulls fuel from the right outer wing tank and transfers it to both inner wing tanks. See above picture for location of fuel cocks.

Note: Fuel cannot not be transferred from inner wing tank to inner wing tank.

ju88a1.txt · Last modified: 2014/09/06 11:25 by ATAG_Torric270