SpudFiles

Posted: **Sat Jan 23, 2010 4:49 am**

CpTn_lAw wrote:Jack, have you seen my hybrid preview? What recoil should I expect? Would it be adivsed to add a muzzle brake?

I tried but the pictures were the size ok a hippopotamus skin so I gave up

What performance are you predicting?

If you know projectile velocity and weight you can calculate approximately what the recoil forces will be, still I don't expect it will be worse than a 12 bore

Posted: **Sat Jan 23, 2010 5:34 am**

Lol, They automaticly resize for me...

Well, would I be a fool to say i expect 1200 fps from a 16mm marble? I really don't know...I plan on shooting carbon arrows, lead sinkers (different sizes , from 10 x 2grams buckshot to 18 gram lead sinkers...

Posted: **Sat Jan 23, 2010 6:03 am**

Have you tried modelling it in HGDT?

Posted: **Sat Jan 23, 2010 10:54 am**

McCoytheGreater wrote:We're thinking of something similar to Jeepkahn's design. He says it removes a considerable amount of recoil. We're thinking 4" pipe at 8" long ported on the top and sides to reduce muzzle flip and recoil and in actuality giving us a version of a compensator type muzzle break. Here's the question. Jeepkjan's brake is open on the end, while i've seen others where the brake is reduced back to just over the bore size. I'm pretty sure the reduced ended muzzle break will work slightly better than the open ended one, but I don't want to risk our sabots getting lodged inside the brake. Is my paranoia well founded?

Sorry i didn't see this sooner, But, my brake is not open on the end, it's bore is only 1/8" larger than the barrel bore, it's made from a piece of 1.125"IDx2od" aluminum pipe/tube...

Posted: **Sat Jan 23, 2010 10:57 am**

The Muzzle brake actually vents towards the back. No need for elbows. The fitting does it for us. We are going to slice off the connector parts for the 2" holes. That will help the gasses vent back more. Thanks, anyway Jeepkhan. We were seriously thinking about a ported brake. We looked around our local hardware store and came up with this one.

Posted: **Sun Jan 24, 2010 12:20 pm**

What a monster!

I like it. I'm really surprized that the muzzle brake made that much difference. OTOH, I did have a large pneumatic that gave significant recoil w/o a projectile, so I guess it's reasonable.

Posted: **Sun Jan 24, 2010 12:24 pm**

Skywalker wrote:I'm really surprized that the muzzle brake made that much difference.

If they weren't worth the trouble, would they hang this much metal on the business end of the M109

Posted: **Sun Jan 24, 2010 1:58 pm**

jackssmirkingrevenge wrote:
If they weren't worth the trouble, would they hang this much metal on the business end of the M109

Jack, I'm familiar with the muzzle brake, but do you or anyone else know what the large cylinder halfway up the barrel is for? (referring to the pic of the M109)

Posted: **Sun Jan 24, 2010 2:06 pm**

kenbo0422 wrote:do you or anyone else know what the large cylinder halfway up the barrel is for?

It's a chamber into which propellant gasses are bled, this tends to create a flow out of the muzzle after the projectile has left which keeps the exhaust gasses from entering the turret. This is why you see it on enclosed turret systems but not on towed artillery.

Posted: **Sun Jan 24, 2010 9:12 pm**

Here is a video from a beautiful day of spudding.

[youtube][/youtube]

I hope that the video still has sound, I'm currently fighting a YouTube copyright "free use" clause. "Hold On" by Yes should be playing (I thought it was appropriate). It is still some awesome footage regardless.

Posted: **Sun Jan 24, 2010 11:12 pm**

Yup, the song was playing all the way through. Perfect!

Posted: **Mon Jan 25, 2010 1:13 am**

Very nice, I particularly like the way it recoils and returns to battery, very... howitzeresque

Posted: **Mon Jan 25, 2010 3:10 am**

Awesome! It packs a punch and a half for sure.

Posted: **Mon Jan 25, 2010 8:02 am**

WOW, totaly envious! It's HUGE!

Well done!

Posted: **Mon Jan 25, 2010 9:46 am**

*Applauses*
Very nice guys!
Looks like a well made cannon, with a great video.
Good presentation!

Recoil system looks sweet.

SpudFiles

ME1-05H Stand w/ elevation adjustment.