Hybrid Cannons

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SpudFiles Potato Gun Commercial

Last post by quinn whitsitt
Posted in Combustion Cannons
Replies: 15
by PCGUY » Tue Oct 29, 2013 10:54 pm » in Combustion Cannons
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I've been wanting to get in some spud shooting action this fall before the weather got cold. I know it's been a while since I filmed anything for...

Last post

thank you for creating this website is there anything i can do to help
15 Replies

976768 Views

Last post by quinn whitsitt
Fri Feb 09, 2024 2:38 pm
HYBRID FUELING 101

Last post by quinn whitsitt
Replies: 106
by SpudBlaster15 » Mon Mar 17, 2008 10:56 pm
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First post

Part 1: Using traditional hybrid fuel meters correctly

Question: How many of those who have constructed hybrid launchers have used either an online...

Last post

thank you this is so helpfull!!
106 Replies

651875 Views

Last post by quinn whitsitt
Fri Mar 01, 2024 10:50 am

Topics

Coaxial hybrids: does anybody really do them?

Last post by SpudFarm
Replies: 6
by D_Hall » Sun May 18, 2008 5:36 pm

First post

OK, so HGDT is a mutation of GGDT. That's why it has the ability to model coaxial hybrids.

But....

I'm investigating an improved combustion model...

Last post

improve with no doubt from my side.

6 Replies

3783 Views

Last post by SpudFarm
Mon May 19, 2008 7:43 am
11x burst disk

Last post by SpudFarm
Replies: 18
by SpudFarm » Sat May 17, 2008 9:52 am
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i got a problem. in my hybrid (has arrived but can't pick it up untill next week) i will run 11x on a 2 burst disk housed in a union. the problem is...

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if anyone has seen the connection on the barrel on the hybrid that is what i think of but not with tose locks, i'll use screws
18 Replies

4505 Views

Last post by SpudFarm
Sun May 18, 2008 6:50 am
hybrid theorie (90% sure that is spelled wrong)

Last post by SpudFarm
Replies: 23
by SpudFarm » Thu May 08, 2008 9:06 am
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after i look at the DDT has it ever happened in a hybrid thread and saw the gun from the archive i started to think of this:

people is using PVC for...

Last post

you have seen PVC hybrids so not everyone cares that much.. and when that is said not everyone post their cannons here
23 Replies

4458 Views

Last post by SpudFarm
Wed May 14, 2008 4:16 pm
Hybrid Entropic Fuel Meter Formulas

Last post by dongfang
Replies: 10
by mark.f » Sun May 11, 2008 9:08 pm

First post

Alright, before I get into any math or numbers, let me clarify a little on the scenario.

These fueling formulas are for what I call an entropic...

Last post

Hi,

Why not just put a super strong steel or aluminum or what not, brushless fan in there. If it was at the back of the chamber I guess it would do...

10 Replies

3054 Views

Last post by dongfang
Wed May 14, 2008 6:16 am
HGDT 0.4 online

Last post by jimmy101
Replies: 57
by D_Hall » Sun Apr 27, 2008 5:00 pm
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Still looking for feedback from 0.3's addition (sensitivity). Surely more than two folks have an opinion?

But in the meantime, I've been a busy...

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I agree, not worth diddlin around with something that'll get lost in the noise.

Still, the difference in thermal conductivity is huge, the...
57 Replies

17720 Views

Last post by jimmy101
Fri May 09, 2008 3:48 pm
another DDT question.

Last post by DYI
Replies: 17
by SpudFarm » Sat Apr 26, 2008 6:24 pm
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when i am going to build my hybrid i start thinking about DDT hazard.

the chamber is going to be 24 of 5 ID pipe..
i am going to operate it at 11x...

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Im not sure about what I stated above.
Its just a vague memory.

A vague memory indeed, from way back when people actually thought that 4x was...
17 Replies

4461 Views

Last post by DYI
Thu May 08, 2008 4:59 pm
DDT, has it ever happend in a hybird?

Last post by SpudFarm
Replies: 15
by drex » Wed May 07, 2008 6:14 pm
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i hear all about DDT, but i have yet to find an instance where it has actually accrued in a cannon. has it ever happend?

im not doubting that it...

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i am going to test it too.. i have thought of making a topic about materials i should test but i guess i am using 1 and 2 steel for it.
i will put a...
15 Replies

3582 Views

Last post by SpudFarm
Thu May 08, 2008 9:01 am
The Lieutenant Johnson Hybrid

Last post by bigbob12345
Replies: 73
by bigbob12345 » Sun May 04, 2008 12:12 am
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Well this is my first submition to the hybrid cannon showcase.
I am having problems fueling it but Ill get to that later. i have gotten a couple...

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Thank you matt :)
73 Replies

27020 Views

Last post by bigbob12345
Thu May 08, 2008 8:25 am
?s with biohazard.

Last post by drex
Replies: 36
by pat123 » Tue May 06, 2008 3:54 pm
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I went outside to shoot it today and every time i shoot a hybrid or combustion I like pnuematics more and more. here are my questions.

1. If the...

Last post

8) sweet
do you think that we need a new barrel, or did you get the other one strait?
36 Replies

8148 Views

Last post by drex
Wed May 07, 2008 4:33 pm
This can't be right (chamber fan flow velocity)

Last post by jimmy101
Replies: 6
by D_Hall » Sat May 03, 2008 4:30 pm

First post

So I'm looking at cooling fans (ie, chamber fans). I want to know what kind of air velocities are being generated by them.

Looking over at McMaster,...

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Hi,

That's why NASA switched to Metric :D :D :D

Regards
Soren
Not really. NASA switched to metric for the same reason the US military is mostly...

6 Replies

2928 Views

Last post by jimmy101
Mon May 05, 2008 5:41 pm
3" exhaust barrel

Last post by SpudFarm
Replies: 5
by SpudFarm » Sat May 03, 2008 4:19 am

First post

hey i think i am going to buy a 3 barrel for my hybrid but if i am going to buy 15foot of galvanized i get ruined...

then i wonder if you think i...

Last post

mabe some wet fine grained sand with water in it?
and if i am going to get the pipe on the outside i could have bought 3 galvanized in the first...

5 Replies

1636 Views

Last post by SpudFarm
Sat May 03, 2008 7:05 pm
Fuel Injection and Air Mixing....

Last post by D_Hall
Replies: 27
by D_Hall » Wed Apr 30, 2008 11:15 pm
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Just thought I'd bounce an idea off ya'll. I'm pretty sure it's a sound idea, but still, a fresh pair of eyes never hurts.

OK, proper fuel/air...

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What is the source of the makeup gas for the eductors? Are you going to put the entire eductor in the chamber and just plumb in the high pressure...
27 Replies

7146 Views

Last post by D_Hall
Sat May 03, 2008 4:21 pm
Cartridge load hybrid

Last post by pat123
Replies: 6
by SPG » Wed Apr 30, 2008 3:00 am

First post

I can't claim this as mine, it's off the French forum, but I thought it opened up interesting possibilities - HERE

What I thought was...

Last post

Here is a link I used a thing to translate the website.

here is the thing i used, might come in handy

6 Replies

3056 Views

Last post by pat123
Thu May 01, 2008 7:29 pm
Help on hybrid fueling please.

Last post by jimmy101
Replies: 11
by elitesniper » Sat Apr 26, 2008 10:00 pm

First post

Hey guys I have just finished my hybrid, but I can't get the darn thing to fire! Yes I have read Hybrid Fueling 101, but I have no idea what it...

Last post

Do you have a small photoflash tube or tiny neon bulb laying around? The neon bulb is called an Ne-2 and are what they use as the indicator light in...

11 Replies

5701 Views

Last post by jimmy101
Thu May 01, 2008 12:45 pm
Hybrid1

Last post by DYI
Replies: 46
by DYI » Thu Apr 17, 2008 9:39 pm
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I'm proud to announce that my never-before-tried metering system works - flawlessly. I don't know for sure, but most new hybrids don't fire within 50...

Last post

Well I don't think I'd fire it as a handheld at full power...

Right now I'm just taking a bit of a break from spudding, as my various trains of...
46 Replies

15326 Views

Last post by DYI
Wed Apr 30, 2008 7:03 pm
using cam locks for burst discs-

Last post by JDP12
Replies: 15
by JDP12 » Sun Apr 27, 2008 6:58 pm
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hey all, i'm sick of my union leaking, so i've decided to use cam locks. my only question is- how easy is it to use them with burst discs- like how...

Last post

yea that's true markfh11q... and i agree with you, i would never trust PVC with any hybrid.. even if it may be somehwat safe at 2x.. I'm still...
15 Replies

5032 Views

Last post by JDP12
Mon Apr 28, 2008 8:50 am
HGDT 0.3 online (new feature)

Last post by Ragnarok
Replies: 4
by D_Hall » Sun Apr 27, 2008 1:32 am

First post

OK, just looking for early feedback on a new feature I've added to the Beta.

In the tools pulldown menu, look for Sensitivity Studies.

It should...

Last post

That's a pretty useful feature.

I don't know that I'll have cause to use it any time soon, as I'm not really a hybrid/combustion person, but if I...

4 Replies

2036 Views

Last post by Ragnarok
Sun Apr 27, 2008 5:25 pm
Oxy/fuel Mixture DDT Runup Distances

Last post by SpudFarm
Replies: 9
by DYI » Tue Apr 22, 2008 8:43 pm

First post

I've got something of a handheld in the works, and I don't want what my username abbreviates to happen yet, so here's the question:

How does oxygen...

Last post

You'll probably see stress cracks and deformities before it actually explodes . I doubt there's enough energy density in your chamber to make it go...

9 Replies

6522 Views

Last post by SpudFarm
Sat Apr 26, 2008 6:14 pm
10-15x hybrid

Last post by SpudUke5
Replies: 21
by elitesniper » Fri Apr 25, 2008 10:52 pm
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well, guys just asking for some advise, im stepping up a step from piston valves to hybrids( don't worry I will always stay loyal to pistons :) ) I...

Last post

And where did you get that ball valve? Even McMaster doesn't have brass ball valves rated that high.

Well its not brass; its hydraulic carbon...
21 Replies

5188 Views

Last post by SpudUke5
Sat Apr 26, 2008 4:56 pm
Biohazard Build Log

Last post by SpudFarm
Replies: 29
by pat123 » Thu Apr 24, 2008 3:37 pm
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I finally decided to post this gun. Me and drex built it.
I wasn't sure if a build log would go in the showcase or not so I put it here please move...

Last post

i also thought flybacks was easy untill i talked to Galfisk about them.

i set of my hybrid at 6x with a almost 1/2 gap with the camera and coil.
(my...
29 Replies

6169 Views

Last post by SpudFarm
Sat Apr 26, 2008 8:35 am
Schrader Pressure?

Last post by Brian the brain
Replies: 20
by FordGtMan » Fri Apr 25, 2008 12:13 am
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Hey, i was wondering what sort of pressures would be suitable for a regular schrader valve, and what mix it could be taken up to. This is the one i...

Last post

Use QD on my fridgepressor. Had them at 40 bar, without a problem.
20 Replies

6169 Views

Last post by Brian the brain
Sat Apr 26, 2008 6:37 am
pipe sizing

Last post by Eddbot
Replies: 7
by shiftyguy » Wed Apr 23, 2008 1:33 pm

First post

I am mid way threw fabricating my chamber it will be 16 x 3 and the pipe will be 3/16 thick pipe wall.

I am planning on going as high as 6x.

Anyone...

Last post

really guys, a metal pipe was implied, who measures woven reeds in fractions of an inch, you only measure those in metric :D

7 Replies

2924 Views

Last post by Eddbot
Thu Apr 24, 2008 1:20 am
Pat123's Hybrid Rifle

Last post by Ragnarok
Replies: 19
by pat123 » Fri Mar 28, 2008 4:21 pm
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Here it is finally after alot of problems. thanks to everyone who helped me.

Pat

Last post

and i get 1906fps with hgdt..
Have you pointed this out to D_Hall? The beta can only be really improved by the application of solid data.
19 Replies

9676 Views

Last post by Ragnarok
Wed Apr 23, 2008 4:38 pm
Apparently there's nothing new under the sun....

Last post by psycix
Replies: 22
by D_Hall » Tue Mar 25, 2008 9:38 pm
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So today I'm at the cafeteria eating lunch and having a chat with a colleague who works in another branch. Somehow the topic of The Pipe Dream came...

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Speaking of the Pipe Dream... I'm keeping my fingers crossed, but it looks like actual construction may start in 4-6 weeks. :twisted:

Yeeehaaaa! :D...
22 Replies

6711 Views

Last post by psycix
Wed Apr 23, 2008 7:02 am
A few progress pictures of my handheld. the CPH

Last post by MrCrowley
Replies: 12
by Jeeperforlife » Thu Apr 10, 2008 9:22 am

First post

My handheld is a coaxal piston valved hybrid. Nicknamed CPH for short.
The tee that you see will have a shrader valve on the bottom for filling and...

Last post

I guarantee I will pick up the projects and hobby again latter.
You couldn't drop this hobby if you tried :wink:

Looking good so far, i'll be...

12 Replies

4530 Views

Last post by MrCrowley
Tue Apr 22, 2008 10:22 pm

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