I want to build a piston hybrid, so to get some experience with construction and fueling, I made a small hybrid. Inspired by JSR's hybrids of course
I fuel it with a syringe. Uses 1,8 ML of butane per mix number.
[youtube][/youtube]
[youtube][/youtube]
Re: Another mini hybrid
Posted: Sun Aug 28, 2011 4:09 am
by jackssmirkingrevenge
Labtecpower wrote:Inspired by JSR's hybrids of course
...down to the plastic electrical connector as a burst disk holder good stuff, moar mix numbers!
Posted: Sun Aug 28, 2011 4:12 am
by MrCrowley
It's a hybrid, and I like hybrids so... good job!
Posted: Sun Aug 28, 2011 4:13 am
by jackssmirkingrevenge
By the way, you haven't told us about calibre and projectiles? If you did, I missed it.
Posted: Sun Aug 28, 2011 4:17 am
by Labtecpower
It's ugly as a turd, but I think i'll make something better when the schools start again.
Probably will be a pistol or something like that..
@ JSR:
Calibre is 10 mm. I'm shooting 5 gram pieces of steel, the barrel is 40 centimeters long.
HGDT says the velocity is around 150 m/s, wich I find pretty nice
(GGDT=HGDT
Posted: Sun Aug 28, 2011 8:36 am
by Labtecpower
I decided too shoot the meme family
Sadly my hybrid blew up at the first shot
[youtube][/youtube]
Posted: Sun Aug 28, 2011 8:42 am
by jackssmirkingrevenge
Very well drawn I have to say
Labtecpower wrote:Sadly my hybrid blew up at the first shot
The fact that you used "blew up" and ":D" in the same sentence means that you are now a true builder of epoxy based hybrids, congratulations!
Posted: Sun Aug 28, 2011 8:48 am
by Labtecpower
It gave a very nice bang, luckily I was wearing ear protection
jackssmirkingrevenge wrote:The fact that you used "blew up" and ":D" in the same sentence means that you are now a true builder of epoxy based hybrids, congratulations!
jackssmirkingrevenge wrote:Very well drawn I have to say
Thanks for both compliments
I'm going to reconstruct the thing with some screws through the chamber side into the back plug. Should help with containing pressure.
Posted: Sun Aug 28, 2011 12:41 pm
by Labtecpower
Update:
Fixed the thing. I inserted some screws, so it will either have to break the screws or rip the tube to launch the back plug.
Now the front is the weakest part....
I think i'm ordering 400 ml's of epoxy in a while
By the way, if you turn up the volume after the bang in the video, you can hear the neighbour kids yelling luckily we have nice neigbours, so I won't have to expect police coming to my house....
Posted: Mon Aug 29, 2011 1:40 am
by jackssmirkingrevenge
Labtecpower wrote:Now the front is the weakest part....
The back plug might have blown out because I forgot the epoxy while I inserted it
I use 1-hour epoxy, so i'm ready for some testing. I don't think sad troll and Y U No guy will survive.
Posted: Mon Aug 29, 2011 3:48 am
by jackssmirkingrevenge
Labtecpower wrote:I forgot the epoxy while I inserted it
That's what.... he said? Hmmm...
How did it hold pressure then? or is there an o-ring somewhere?
I use 1-hour epoxy, so i'm ready for some testing. I don't think sad troll and Y U No guy will survive.
1 hour epoxy needs at least 3 hours to be fully cured
Posted: Mon Aug 29, 2011 3:54 am
by Labtecpower
It had over 12 hours of curing, don't worry
jackssmirkingrevenge wrote:How did it hold pressure then? or is there an o-ring somewhere?
I was wondering why it was leaking so badly. I closed all the leaks with epoxy, and it held pressure just fine. Now I don't have a single leak at the first try, so it should be better.
Also made the spark gap smaller, it's 0,3 mm now.
I ran a GGDT calculation for an 8x shot.
[youtube][/youtube]
This shot went through the mp4 player, the 7 cm of newspapers, and almost through the one inch piece of plywood, with an energy of about 177 joules
More impressive than I tought
Posted: Mon Aug 29, 2011 2:32 pm
by Labtecpower
I did some extra calculations, and I discovered I used twice as much fuel as I should have. I think this is why I found the power a bit sloppy.
Another vid:
[youtube][/youtube]
I also bought a new barrel. The previous one had a 10 mm bore, and was 40 cm long. The new one has a 11 mm bore, and is 100 cm long.
Posted: Mon Aug 29, 2011 2:36 pm
by jackssmirkingrevenge
LOL @ the mp3 player, that would have killed in high speed!
My mini was just 5.5mm/6mm bore, as you have twice that you can enjoy similarly high muzzle energies without necessarily going right up to 28 mix.
I take it the bug has been caught and we will be seeing more?
I did some extra calculations, and I discovered I used twice as much fuel as I should have. I think this is why I found the power a bit sloppy.
