SpudFiles

a few weeks ago I downloaded chairgun... and I think that it might be quite useful for any spudder

it's a ballistic calculator for airguns... IHMO it's much better than the one included in GGDT



you can download it here -> http://www.chairgun.com/offset/chairgun2.htm



one of the nicest feature of it is an ability to compare up to 3 different projectiles

in the pic below I compared 3 different projectiles as far as their energy retention is concerned... (cd value is roughly 0.4 as they are all spherical projectiles

blue one - 16mm marble 5g
red one - 9.65mm steel bearing 3.5g
the green one 9.65mm lead ball 5g
seems pretty informative doesn't it ??

Good stuff I've had chairgun for ages but never really used it.

Is the distance in metres?

Interesting to note that a marble would have only 10% of its original muzzle energy at 100 of whatever those distance units are.

Chairgun has very tight restrictions, and isn't really suitable for most spudding purposes - it won't accept projectiles of more than 8 grams, and will only do target shooting trajectories.

Hopefully, the LRC will eventually be able to do this sort of thing - any kind of shooting a spudgunner might expect to do, I hope to be able to deal with it.
At least, it might be capable of these things when I stop trying to break it with improvements and find time in amongst the dozens of other projects I seem to have encumbered myself with:

Art; an armoury for a Sci-Fi tabletop game; Cannon building; Modifying gaming controllers; tuning my air rifle; ballistics calculators...

It's a lot for one person to do, even one as awesome as me.

Chairgun has very tight restrictions, and isn't really suitable for most spudding purposes - it won't accept projectiles of more than 8 grams

yeah I forgot to mention that... actually for the version I am using 5 gram is max
I am trying to find some way to use heavier ammo with this program but so far with no luck

@jsr
yes the distance is in meters... the interesting thing about the graph I put above is that muzzle energy is completely irrelevant here (it draws the same graph when muzzle energy is 16J and 80 J; it's all about ammo used)


I've noticed that marbles lose their velocity quite fast but It happens to a greater extend than I though... notice that I put the muzzle energy for a marble at 100j and 50j for 9.6mm ammo