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The aiming point for the bomb release can be calculated, when you know some values.
What you need is:
The general formula for a 90° dive is:
By a dive in an angle you have to seperate the horizontal and vertical speed components which results in:
Since we don't know the time but our height, we can convert the formula to
With this calculated time we can calculate our horizontal component s.
As an example:
Results in:
With s and h we can now calculate our aim angle ε.
This means you have to aim ~5° below the Revi-center.
There are 3 points which also influence the aim angle ε.
You can also calculate the aim angle ε under the consideration of the back drift distance Δx. For this your formula is:
As example:
Results in:
As experience value for the Ju 88 is at dive angles above 50° a value of 1° and below 50° a value of 1,5° to add (in the Ju 88 tables already considered), so for Ju 88
For the usual dive angle and release heights the aim angles are arranged in the following tables.
Aim Angle for Ju 87 | |
---|---|
Release Height = 700 m | Release Height = 1000 m |
Dive Angle α = Aim Angle ε | |
60° = 4° | 60° = 5,5° |
70° = 2° | 70° = 3,0° |
80° = 1° | 80° = 1,5° |
Aim Angle For Dive Angle 90° = 0° |
Wind Correction Angle For Ju 87 | |||||
---|---|---|---|---|---|
Dive Angle α | Wind Speed in km/h | ||||
10,8 | 18 | 36 | 54 | 72 | |
60° | 1,5° | 2° | 4,5° | 6,5° | 8,5° |
70° | 1,5° | 2° | 4,5° | 6,5° | 9° |
80° | 1,5° | 2° | 4,5° | 7° | 9° |
From L.Dv. T2332/5b (June 1941)
The use of PC-RS bombs is only carried out against battleships, aircraft carrier and heavy cruisers, but not against bedrock emplacements. The use of this special ammunition has to be made only by specially trained groups.
Shall the PC 1000 RS be dropped with the Ju 87, so the Pilot has to use the following table.
The PC 1000 RS must not be dropped by an angle of less than 60°, to prevent bouncing and increase the impact.
Also do not drop the PC 1000 RS with the Ju 87 below 1200 m height, to take advantage of the full impact power.
Attention! Because of self endangerment it is forbidden, at the use of the PC 1000 RS with the Ju 87 after the bomb release to dive further into the old direction or to dive steeper. Delayed flare-out is forbidden.
The A/C has to flare-out simultaneously with the release of the PC 1000 RS.
By usage of PC 1000 RS is the ZSK generally to switch to “v.V.”[full delay].
Release of the PC 1000 RS with swivelling Revi has to be done like the normal bomb attack according to the guidelines of the L.Dv. 20/2. The wind correction angles for the Revi are the same. Only the aim angles at still wind are changing and can be taken from following table:
Dive angle | Release heights | ||
---|---|---|---|
1200 m | 1400 m | 1600 m | |
60° | 9,5° | 10° | 11° |
70° | 5° | 5,5° | 6° |
80° | 2,5° | 2,5° | 2,5° |
By wind change additionally the aim angle!
The change for a wind of 100 km/h amounts to:
At tail wind increase the aim angle by this value, at up wind reduce.
Aim Angle for Ju 88 | |
---|---|
Release Height = 1000 m | Release Height = 1500 m |
Dive Angle α = Aim Angle ε | |
40° = 10° | 40° = 14° |
50° = 7° | 50° = 11° |
60° = 5° | 60° = 8° |
70° = 3° | 70° = 6° |
For a dive-angle α = 50° and an indicated end-dive-speed of 550 km/h (average dive-speed ~ 430 km/h) accounts the wind-correction-angle for every 10 km/h wind-speed per 1°. At 30 km/h wind therefor 3°.
The dive method is the same, also the wind correction. The Pilot has to value course and speed of the target and then select the point for the dive.
As an example:
Carry out:
General Instructions:
Prediction mete for the initial dive point | ||
---|---|---|
at height | speed of the ship | |
25 sm | 30 sm | |
5000 m | 480 m | 560 m |
4000 m | 390 m | 450 m |
3000 m | 300 m | 350 m |
ship's lentgh: | speed: | |
---|---|---|
battleships and aircraft carrier | 200-250 m | 25 sm |
cruisers | 150-180 m | 30 sm |
merchant ships | 100-150 m | 12-15 sm |
from D(luft)T.229/4 annex 2 (may 1942)
Same aiming principle as Ju 87 but do not exceed the dive angle above 45° (for the Bf 110 temporary). Mortal danger for pilot! (bomb can fall into the propeller circle)
Dive angle | Height difference |
---|---|
20° | 3000 m |
30° | 1800 m |
45° | 1400 m |
Note: height difference from initial dive point to release
Release height | |||
---|---|---|---|
Dive angle | 500 m | 700 m | 1000 m |
20° | 8° | 11° | 14° |
30° | 6° | 8° | 11° |
45° | 4° | 6° | 7° |
Dive angle | |
---|---|
20° | for every 10 km/h up- or tail-wind ½° |
30° | for every 10 km/h up- or tail-wind ¾° |
45° | for every 10 km/h up- or tail-wind 1° |
In general the same as for the Bf 109.