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

602074 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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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

523920 Views

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

Topics

the JAUSH (in operational stage)[[[[UPDATES 28/3/2008]]]]

Last post by SpudFarm
Replies: 36
by sniperjosh » Tue Jul 10, 2007 4:20 am
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Hi all, just thought i share my cannon with the community.

Name: JAUSH ( J osh's aus sie h ybrid)

Description: small bore, high mixture hybrid....

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damage aswell :)

sthorne kidding with you, he meant you slacked on the image taking .
36 Replies

17091 Views

Last post by SpudFarm
Fri Mar 28, 2008 5:25 am
Hybrid Fan

Last post by sniperjosh
Replies: 12
by Hubb » Sat Mar 22, 2008 9:31 pm

First post

While asking questions about my hybrid, I touched on the topic of a fan. It was immediately noted that a fan would be destroyed in a hybrid. It was...

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Hmm, a second or two still seems wrong to me, the instant my finger pushes the trigger, there is a boom :wink:. What mixtures does this happen at?

12 Replies

3849 Views

Last post by sniperjosh
Thu Mar 27, 2008 5:51 am
Frocksie's Hybrid

Last post by MrCrowley
Replies: 39
by frocksie » Tue Mar 25, 2008 9:40 pm
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After having conquered a combustion gun and piston valve, I decided to make a hybrid both for the power and cool factor.

Without further ado, here...

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It looks a lot like my first design.
Probably over half of the hybrids on this site do :)
39 Replies

14964 Views

Last post by MrCrowley
Wed Mar 26, 2008 10:38 pm
Pressure drop across burst disc plain

Last post by D_Hall
Replies: 11
by D_Hall » Sat Mar 22, 2008 5:06 pm

First post

In the world of pnuematic guns, the efficiency of one's valve is very important. Low efficiency valves result in large pressure drops across the...

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on a side note, D_hall do you know of any programs out now which calculate the performance of hybrids (like ur ggdt does for penumatics).
Well,...

11 Replies

4319 Views

Last post by D_Hall
Tue Mar 25, 2008 8:57 am
noob question by spudfarm

Last post by DYI
Replies: 19
by SpudFarm » Fri Mar 21, 2008 5:56 pm
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i make it fast..
on like 20x mix in a hybrid why does not the propane become liquid?
does there have to be 100% propane under pressure to become in...

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2) Order KNO3 and KMnO4.
3) Purchase enough brass media to fill my 6 x 9 PVC ball mill jar.

Getting ready for summer already I see :D
19 Replies

3962 Views

Last post by DYI
Sun Mar 23, 2008 7:06 pm
Gasoline stochiometric mixture.

Last post by Necrosis
Replies: 6
by Necrosis » Sat Mar 22, 2008 8:19 pm

First post

What is the perfect mix of air and gasoline in percentage of gasoline for the given volume?

I found that a ratio of 14:1 was best or something.. but...

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My mom uses really tiny syringes for her reuma, I figured i'd use those.. but.. that's a really tiny amount.

I might just use a buthane lighter and...

6 Replies

2121 Views

Last post by Necrosis
Sun Mar 23, 2008 3:13 pm
Hybrid Design and Questions

Last post by tyrant_bb
Replies: 9
by tyrant_bb » Sat Mar 15, 2008 10:48 pm

First post

Alright... so I made a basic combustion spud gun and it works great. I realize I should have more experience with spud guns than 3 shots with 1...

Last post

OK I know most of this now, except for the propane meter. I'm using Fuel Tool to find this out now...

When it asks for atmospheric pressure, is...

9 Replies

3827 Views

Last post by tyrant_bb
Sat Mar 22, 2008 9:33 pm
Mini hybrid => help?

Last post by CpTn_lAw
Replies: 10
by CpTn_lAw » Thu Mar 20, 2008 10:44 am

First post

Hey everybody! This afternoon i have some time, so i decided to try an make a really mini hybrid. Ok, first, it's all steel, 1/2 chamber, i inject...

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well thank you all for your tips, i'm gonna try everything you suggested right after lunch ^^ . i'll keep you posted with the advancements.
btw,...

10 Replies

4109 Views

Last post by CpTn_lAw
Sat Mar 22, 2008 6:49 am
Hybrid I think.

Last post by jjjd
Replies: 6
by jjjd » Thu Mar 20, 2008 2:19 pm

First post

Hey guys, I have always wanted to build a small but strong portable hybrid, so My idea was to make it like Fnord's Hybrid and use a vertical piston...

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Okay, well the way I understand the piston is off the chamber instead? Im sorry but that is all I get, I have no idea as to how a regular piston...

6 Replies

2442 Views

Last post by jjjd
Thu Mar 20, 2008 11:35 pm
What does 1X, 2X, 3X, etc. mean?

Last post by Hotwired
Replies: 8
by D_Hall » Thu Mar 20, 2008 9:38 am

First post

READ BEFORE YOU ANSWER!

OK, nominally speaking 1X is a stoichiometric mix of fuel and air at 1 atmosphere pressure. 2X is at 2 atmospheres. 3X at...

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I don't believe anyone actually does mixes according to their local atmospheric pressure.

Multiples of 1atm (being 14.7psi) perhaps rounded to a...

8 Replies

2902 Views

Last post by Hotwired
Thu Mar 20, 2008 5:30 pm
Triangle strips. Anybody got any experience with 'em?

Last post by psycix
Replies: 9
by D_Hall » Tue Mar 18, 2008 9:51 am

First post

So I've been working on the Pipe Dream design trying to firm up combustion properties and the like. In talking to an online friend on another...

Last post

@_Fnord

That might work BUT
In the runup pipe the flame front is slow and slowly increases pressure over the whole chamber.
When the chamber finally...

9 Replies

3689 Views

Last post by psycix
Wed Mar 19, 2008 5:51 pm
hybrid fueling

Last post by DYI
Replies: 8
by pat123 » Sat Mar 08, 2008 9:28 am

First post

I know that you use 4.2% propane and the rest air. when you go to 2x do you use 8.4% and so on?

how much pressure of each would you use. there...

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so if I use one bar i use 4.2% of that and if I use 6 bar use 4.2% of that also right?

Take the total volume of gases in your chamber (converted...

8 Replies

2717 Views

Last post by DYI
Mon Mar 17, 2008 6:38 pm
DDT video!!!

Last post by potatoflinger
Replies: 19
by SpudFarm » Sat Mar 15, 2008 4:13 pm
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i did a easy search on youtube and got some results...
(look at other videos of this guy)

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potatoflinger: i posted the video to show the difference between deflagration and detonation.
I was just posting the fast one for those that are...
19 Replies

5670 Views

Last post by potatoflinger
Sun Mar 16, 2008 2:44 pm
hybrid preview

Last post by Hubb
Replies: 17
by pat123 » Mon Mar 10, 2008 9:07 pm
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this is my hybrid so far, i still have a ways to go. I just wanted you guys to look it over to make sure all of the parts look ok. I need to add the...

Last post

the sparkplug doesn't work. when i filled the fitting with hot glue, it melted the electrical tape around the electrode so the spark hits the side of...
17 Replies

4236 Views

Last post by Hubb
Thu Mar 13, 2008 8:46 pm
full sized GB hybrid

Last post by SpudFarm
Replies: 28
by SpudFarm » Tue Mar 11, 2008 2:42 pm
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i am looking into making my next cannon. i have totally stopped making combustions and pneumatics so from now on it is hybrids.

some basic...

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whhhoa 10x :shock:
you should get to mach two :P

my goal for all of my cannons/hybrids is SOS.
a GB at the speed of sound should be interesting...
28 Replies

5277 Views

Last post by SpudFarm
Thu Mar 13, 2008 12:34 pm
Chamber Fan Effects Separation?

Last post by jimmy101
Replies: 16
by D_Hall » Thu Mar 06, 2008 8:10 pm
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Everybody agrees that chamber fans are a Good Thing.

Mechanisms appear twofold....

1) Better fuel/air mixing.

2) Induction of a turbulent flame...

Last post

Jimmy: precisely.

The way this thread is developing, I feel the need to get some smoke, a camera, a fan, and a clear 4 tube.

I suppose the tube...
16 Replies

4863 Views

Last post by jimmy101
Wed Mar 12, 2008 2:03 pm
Peak pressure measurement.

Last post by jimmy101
Replies: 37
by D_Hall » Wed Feb 20, 2008 7:27 pm
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OK, so in the Pipe Dream thread I mentioned that I've got access to high speed pressure transducers (20 kHz response). They're neato toys, but...

Last post

DigiBar PE 200 by HBM. This units give continuous pressure, tare function, stores min and max pressure in memory until cleared. Also graphs...
37 Replies

12315 Views

Last post by jimmy101
Wed Mar 12, 2008 1:59 pm
More noob questions

Last post by DYI
Replies: 18
by ROCK SOLID » Sat Mar 08, 2008 2:45 am
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Hey i just thought of something since Hybrid cannons need pressuried air and propane to make it work why dont they use pressurised pure
oxygen....

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Firstly, BigGrib, oxygen is a diatomic gas, consisting only of oxygen atoms. It is quite stable, and will not violently decompose at ANY...
18 Replies

4596 Views

Last post by DYI
Sat Mar 08, 2008 10:31 am
Hybrid

Last post by SpudFarm
Replies: 24
by pat123 » Mon Mar 03, 2008 5:17 pm
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I decided to build a hybrid for my next gun and I just wanted to run my design by the forum.
thanks,
pat

ps. should any steel pipe work? my Lowes...

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spudblaster i will buy one of you to get rid of the mess on my hybrid!
(then i got shocked before i did the shots on the in the world of spuds today...
24 Replies

6019 Views

Last post by SpudFarm
Tue Mar 04, 2008 10:58 am
engine gun

Last post by goathunter
Replies: 17
by SpudFarm » Sat Mar 01, 2008 5:33 pm
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something hit me (like always)
i use an petrol engine with two cylinders and... the pic says it all.

questions: will it be worth to be the one and...

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Spudfarm: Have you considered a diesel type approach?

Why not have a combustible mixture in a piston with a burst disk to the barrel and ram a...
17 Replies

5225 Views

Last post by goathunter
Mon Mar 03, 2008 8:42 pm
Chamber Volume

Last post by SpudFarm
Replies: 22
by shiftyguy » Fri Feb 29, 2008 11:00 am
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I have noticed many/most of the Hybrids are small in chamber volume. I was considering making one 3 x 14 . Is this too big, what are the guidelines...

Last post

if you got the mony needed... build it and play it safe :)
22 Replies

6105 Views

Last post by SpudFarm
Sun Mar 02, 2008 10:29 am
need of fan?

Last post by jimmy101
Replies: 4
by SpudFarm » Sat Mar 01, 2008 9:27 am

First post

look at the picture

do i need a fan? i thought i don't bechause the compressed air coming in mixed it for you.

i did the first handheld shot today...

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A chronometer is the only reliable way to tell if you've reached the SOS. Listening, or recording, down range has the problem of how much the round...

4 Replies

1764 Views

Last post by jimmy101
Sat Mar 01, 2008 12:45 pm
A Few Hybrid Questions

Last post by Novacastrian
Replies: 51
by Hubb » Mon Jan 07, 2008 9:01 am
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Apart from my pneumatic project, I want to construct me a hybrid. Now, I've never built a hybrid but I do know the principles of such. I'm looking at...

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Seems quite normal, the material used to make those lids is rather brittle, as such it most likely is shattering into many pieces, this is good as...
51 Replies

16039 Views

Last post by Novacastrian
Thu Feb 28, 2008 1:38 am
hybrid questions

Last post by Lentamentalisk
Replies: 14
by imthefreak2 » Mon Feb 25, 2008 6:15 pm

First post

hi everyone. Me and my friends are planning to build a hybrid cannon soon and we're trying to get some of the basic parts. We were thinking of...

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if you even think of walking down the street on PUBLIC PROPERTY with a gigantic hybrid spudgun, you are not in your right state of mind and should...

14 Replies

4408 Views

Last post by Lentamentalisk
Tue Feb 26, 2008 10:54 pm
Flame propogation rate of propane

Last post by jimmy101
Replies: 12
by D_Hall » Sat Feb 23, 2008 2:14 pm

First post

I've been doing some reading on propane flame propogation rate.

On his website Jimmy101 has some experimental data (sort of) as well as an equation...

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Sorry to sidetrack the discussion of the model, but I'm not so sure the projectile starts to move early on in the launch sequence...

Initial...

12 Replies

4529 Views

Last post by jimmy101
Mon Feb 25, 2008 2:20 pm

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