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Bombsight calculator for Android phones


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#1 Vertigo72

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Posted 14 October 2011 - 14:39

I just made my first Android app :) So you have been warned :D

This is pre alpha software, use at your own risk, its only been designed to work on my phone which has a 320x480 screen. Any other resolutions will likely give funny results.

For now, only the HP-400 is supported. This is what it looks like, main screen:

Image

You click on the compass to set your heading. You can also "rotate the compass", but this will give a counter intuitive result, as the compass rotates in the opposite direction (you set the heading, the compass points north). Use the buttons to make fine adjustments.

Likewise you set your airspeed, drag the slider up or down and use the buttons for small adjustments.

THe lower half of the screen shows your plane with the relative wind, as well as the airspeed and windirection you have to enter in the bombsight. Of course, you will have to set wind first, so click on the Wind button:

Image

Drag the arrow to set the wind direction. It defaults to wind from. But you can change that by clicking the grey text area, so you can set the direction the wind blows to

Image

Credits go to Syn Flashman and many others Ill name later (Sorry, Im in a rush).
Feel free to test and post feedback. You can download it here:
http://www.mediafire...6t73jdbd5uw9ah7" onclick="window.open(this.href);return false;">http://www.mediafire...6t73jdbd5uw9ah7
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#2 B24_LIBERATOR

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Posted 14 October 2011 - 14:47

you do realize they made it so you can swap between metric and standard measurements on the bombsight now right?
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Liberator's Tutorials: http://steamcommunit...s/?id=438268482

 

 


#3 Vertigo72

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Posted 14 October 2011 - 14:59

I didnt know that actually :)
Oh well, the main point is obviously the wind calculations.
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#4 242Sqn_Wolf

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Posted 14 October 2011 - 15:06

That's great Skinny :S!:
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#5 Trav194

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Posted 14 October 2011 - 15:33

This is great _Skinny_ just downloaded this app looks like it will be a lot of use top man.
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#6 Vertigo72

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Posted 14 October 2011 - 21:45

This is great _Skinny_ just downloaded this app looks like it will be a lot of use top man.

Let me know how (if) it works. I cant say Ive properly tested it yet.
Im also looking in to making something to help bombing on the Gotha, some sort of indication on how much to offset your aiming to compensate for side wind, but havent figured out yet how to make that useful.
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#7 ChiefRedCloud

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Posted 14 October 2011 - 22:23

Great work here ……. once your done with it perhaps some iPhone techy will bring it over to the iPhone. Thanks …. 8-)
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#8 Vertigo72

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Posted 14 October 2011 - 22:53

I guess it already can work on iphone but its a bit of work :
http://www.pcworld.c...our_iphone.html" onclick="window.open(this.href);return false;">http://www.pcworld.c...rticle/196595/h … phone.html

:D
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#9 JimmyBlonde

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Posted 14 October 2011 - 23:41

Nice work Skinny, I hope you don't get investigated by homeland security!
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#10 O_Taipan

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Posted 15 October 2011 - 07:09

Looks good. The more difficult level bombing is in the Breguet because the speed gauge is in 2 stages of TAS and the bombsight is in IAS, that would be a good addition too :) but I don't have android just an idea.
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#11 Vertigo72

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Posted 15 October 2011 - 09:26

Looks good. The more difficult level bombing is in the Breguet because the speed gauge is in 2 stages of TAS and the bombsight is in IAS, that would be a good addition too :) but I don't have android just an idea.

Can you elaborate? Or link me to a guide? I could add it, but I have to understand it first :).
I would think any speed gauge shows IAS (its short for indicated airspeed after all), so I assume you mean the bombsight of the breguet requires TAS ? Is this different from HP400 ?
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#12 O_Taipan

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Posted 15 October 2011 - 11:31

Yep, well the Breguet speedo has two sets of speeds. The inner dial and the outer dial.

One shows TAS for 2000m altitude, the other shows TAS for 4000m altitude.

The bomb sight works with IAS though. Which makes it very hard to hit accurately unless you calculate the IAS.

You calculator would need to accept altitude and one of the TAS measurements, heading and wind. Easier if they fly only 2000m or 4000m but better if not forced to
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#13 O_Taipan

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Posted 15 October 2011 - 12:08

Here's the conversion thread: Breguet IAS conversion
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#14 Vertigo72

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Posted 15 October 2011 - 13:11

OKay, thats clear, thx. I can (and will) add that for the Breguet

Something else I would like to add is an indication of horizontal offset for bombsights that dont offer it (Gotha, breguet etc). But aside from the difficulty of putting something on the phone screen that makes it useful, I would need to understand the ballistics first. Does anyone know if one can just assume the bomb to deviate perfectly with wind, so with 3m/s wind from the left, it will deviate 3 meter to the right for every second it falls?

And the next question obviously, how long does it fall? Just assume 9.8 m/s2 or is aerodynamic drag taken in to account and does it reach a terminal velocity? Not sure it will make much difference either way, but I may as well try to be accurate :)
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#15 Vertigo72

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Posted 16 October 2011 - 13:32

Just did some test drops; bomb drag is clearly modeled. I suspect even over-modeled. Dropped a bomb from 5000 meter flying 35m/s. Should take 31.9 seconds without drag. I measured 45.4s.

Any developer want to share how this is modeled?
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#16 O_Taipan

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Posted 16 October 2011 - 21:17

Try Gotha with 300kg and 100kg in the same loadout.

If the bombsight moves after 300kg is dropped, it means the bomb sight is calibrated for each bombs drag. From memory I think it does move a little.
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#17 Rexmundi

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Posted 16 October 2011 - 22:16

Very interesting :)

Shame you don't have an Iphone!

Where does one switch between metric and Imperial measurements? I've just done a quick search of the manual, but couldn't find anything relevant.
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#18 O_Taipan

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Posted 17 October 2011 - 04:53

In game settings main page. Not the launcher.
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