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GGDT/HGDT Request Thread

A place to ask general spud cannon related questions.
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Re: GGDT/HGDT Request Thread

Unread postAuthor: topelitemarine » Tue Sep 22, 2015 5:10 am

what value does GGDT use? Cm or inches?
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Re: GGDT/HGDT Request Thread

Unread postAuthor: jackssmirkingrevenge » Tue Sep 22, 2015 6:17 am

It can use both, go on file -> configuration to change the units
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: GGDT/HGDT Request Thread

Unread postAuthor: topelitemarine » Tue Sep 22, 2015 7:39 pm

jackssmirkingrevenge wrote:It can use both, go on file -> configuration to change the units

Got it thanks
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Re: GGDT/HGDT Request Thread

Unread postAuthor: Cthulhu » Sun Apr 22, 2018 9:18 pm

Does this look right for a modified 1 inch sprinkler valve?
I'm getting very odd results using the optimization tool (such as a 1 inch chamber to 100 inch barrel).
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Re: GGDT/HGDT Request Thread

Unread postAuthor: Ragnarok » Mon Apr 23, 2018 10:07 pm

I'm going to hazard a guess that the diaphragm in a sprinkler valve doesn't weigh nearly a pound and a half...

Personally, I don't think GGDT's optimiser is fantastically useful, except in fixed overall length mode (maybe). It's perhaps an interesting lesson in efficiency, but trying to eke every last joule of muzzle energy out of the compressed air leads to launchers that are highly size inefficient.

It's like vehicles from the Shell Eco-marathon, where they try to do thousands of miles on a gallon of fuel. Technically interesting, but wildly impractical for every day use.
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Does that thing kinda look like a big cat to you?
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Re: GGDT/HGDT Request Thread

Unread postAuthor: matti » Tue Apr 24, 2018 12:27 pm

Cthulhu wrote:Does this look right for a modified 1 inch sprinkler valve?
I'm getting very odd results using the optimization tool (such as a 1 inch chamber to 100 inch barrel).


That should be 22g (grams) not 22oz (= 620 grams) :wink:
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Re: GGDT/HGDT Request Thread

Unread postAuthor: Cthulhu » Tue Apr 24, 2018 10:11 pm

Thanks guys, I feel like an idiot for not noticing such a small unit error :oops:
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Re: GGDT/HGDT Request Thread

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Re: GGDT/HGDT Request Thread

Unread postAuthor: Sear » Wed May 09, 2018 8:52 am

Hi guys,

I finally tried GGDT and it is really useful tool. If nothing else I was able to calculate the drag coefficient of my shots based on that :)

Is there a way to calculate the velocity at a distance? Like I would like to calculate a velocity drop after 50 meters, can I do that inside the tool? Or is there any online calculator capable of doing that universally? So far I have found only a simple ones or those suitable for rifles and bullets only.

Thanks
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Re: GGDT/HGDT Request Thread

Unread postAuthor: jackssmirkingrevenge » Wed Jun 13, 2018 4:26 am

Is there a way to calculate the velocity at a distance? Like I would like to calculate a velocity drop after 50 meters, can I do that inside the tool?


Download Chairgun, it's very good once you understand how to navigate it.

https://us.hawkeoptics.com/chairgun.html

Here's an example of data generated to compare two different pellet shapes with all other criteria being equal:

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