Auxiliary gun sight ballistic tables?

[Robin_Hood]

How did you get those 80 mils setting ? F-5E manual shows 120 mils for those parameters, and any correction that I would expect would add to that.

 

I just did a test with your parameters and didn't get bad results : impact point was about 180 to 240 ft away from the aimed point.

 

Here's my procedure, and then the screenshots to show my (last) test pass.

 

Step 1: look up the charts

This time I used the F-5E chart. Page 6-59, 20° 1500ft, 400KTAS

=> 120 mils (FYI, the Mirage III chart gives 116 mils)

 

Step 2: add the boresight correction

As I mentionned in my previous post, I have had good results adding 43 mils to every setting. 43 mils is where the canon boresight is.

=> 163 mils

 

Step 3: add the angle of attack correction

For bombs you will want to correct for angle of attack. I simply looked up my AoA on a level flight @400KTS, which was 3.5°, that is, 61 mils. Add that to your setting.

=> 224 mils

 

This is your final setting. Set your pipper to that.

 

Now, screenshots.

 

#1: my sight picture at release ; notice the pipper position.

#2: my parameters at release ; 20°, 402 KTAS, 1475 ft (slightly low), 3.3° AoA (slightly less than planned)

#3: my bombs ; the racks fall shorter, which is expected ; the single bombs are probably the interesting ones here

#4: impact point for the bombs ; they are slightly long

#5: map view ; bombs fell between .03 and .04 nm, which is between 180 ft and 240 ft - can the map view show feet under a certain distance ? I think it used to do that.

 

 

____

 

Note that I look up some of my parameters in external view. I find it very hard to get an accurate reading of pitch, especially.

[jojo]

Maybe you took into account, but for anybody wanting to try:

the HUD doesn't display KTAS but KCAS

[Shadow_1stVFW]

Shouldn't be significantly different.

 

Sent from my SAMSUNG-SM-G900A using Tapatalk

[emko]

Wow, looks good! :thumbup:

 

How did you get those 80 mils setting ? F-5E manual shows 120 mils for those parameters, and any correction that I would expect would add to that.

 

The game manual shows my values. The 120 mils are corrected to 80 according to the procedure described on page 5-10 of the "Aircrew Nonnuclear Weapons Delivery Manual". There's an example problem - they start with 112, end with 46.

[gospadin]

Since M-2000C use the same Mk 82 as F-4 Phantom or F-16, maybe we can use the tables from the manuals of these US planes.

Same bombs, same speed and same dive angle may give us the same depression angle ?

 

Should be very close, especially if DCS isn't modeling the ejection force of the pylon actuator.

[Robin_Hood]

Wow, looks good! :thumbup:

 

The game manual shows my values. The 120 mils are corrected to 80 according to the procedure described on page 5-10 of the "Aircrew Nonnuclear Weapons Delivery Manual". There's an example problem - they start with 112, end with 46.

 

I am reading the reverse, they say :

 

Sight setting = sight depression from flight path [from chart] + ZSL AoA at release

that is, 112 mils + 13 mils = 125 mils.

 

The rest of the page doesn't seem to talk about the sight setting.

 

PS: I do not have the game manual of the F-5E, so I have no idea what it says.

Edited September 1, 2016 by Robin_Hood

[emko]

Manual is available on Belsimtek's page and the same table is also in Chuck's guide in case you're interested. In manual the dive bombing table is on page 239.

 

http://www.belsimtek.com/upload/docs/DCS_F-5%D0%95-3_Flight%20Manual_ENG.pdf

 

The table is as follows:

Dive angle 20°/30°

Dive initiation altitude 5000ft AGL/6000 ft AGL

Dive initiation speed 350kts/350kts

Release altitude 1500ft/2000ft

Release speed 380-400kts/440-450kts

Reticle depression 80mil/79mil

 

In the document you refer to, the 125 mils you get at step C. If I hadn't totally misread the page, then the calculation continues. In the step E they calculate "effective depression at rollout" which is 84 mils and in F the "initial pipper placement 6 o'clock from target" which is 46 mils. In the yesterday answer I did a mistake and thought the final setting is 46 mils, which is wrong. Sorry :) Should be 84 (calculated in step E). That's what you set. The 46 mils in step F is how much under the target you need to place the pipper just after the rollout (as you descend, the pipper then hit the target, which is the time of release).

 

This is very similar what the game manual for F-5 says - "put your pipper one pipper diameter under the target" - the pipper diameter is 50 mils in F-5.

 

Edit: This table is what I used when I did the bombing run in post 25. In the F-5 case the first bomb landed circa 9m short (= 3 times the width of BMP-1 which is 2,9m) - TacView shows I released a little early which could be the cause.

 

And BTW the "dive initiation altitude" didn't work for me in M2K. Maybe I have set my axes wrong, but the Mirage is less maneuverable and sleeker than the F-5 in my case. So it rolled slower and accelerated faster so I started my dive at higher altitude and lower speed - but those parameters don't really matter.

Edited September 1, 2016 by emko