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Post by droopaille on Jul 1, 2016 8:17:29 GMT -5
Because I collect the non finished projects, here is a new one.
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shiftysgarand
Corporal
BangbangbangbangbangbangbangbangPING
Posts: 1,165
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Post by shiftysgarand on Jul 1, 2016 9:23:45 GMT -5
Is it/ will it be functional? As always very cool
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Post by droopaille on Jul 1, 2016 12:20:04 GMT -5
Of course !!
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Jul 1, 2016 20:06:13 GMT -5
As always, very cool. It appears to be set up for shells configured from Mosscart type shells? Perhaps fireworks mortar shells? Tennis balls?
I am unclear as to how the crank device would alter the traverse or elevation?
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Post by droopaille on Jul 12, 2016 11:17:55 GMT -5
What is a mosscart ?
I will explain all parts withs pics soon. Waiting with the first try of my propeller engine for rocket
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Post by droopaille on Jul 14, 2016 8:15:50 GMT -5
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Jul 14, 2016 17:02:04 GMT -5
Brilliant! Thanks for the helpful, in progress shots.
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Post by droopaille on Jul 16, 2016 4:13:41 GMT -5
Thanks I've edited and translate. There a piece I don't understand the use : the two tubes which slide in the flange ones. Is anybody know how it works or what is the utility of this part ?
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Post by brownien on Jul 18, 2016 9:20:46 GMT -5
The purpose of those parts is to act as a recoil dampener for the bipod. When the real mortar would fire, a very large recoil impulse could possibly throw off the sighting adjustments between shots and possibly damage the bipod itself.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Jul 18, 2016 17:52:28 GMT -5
A mortar tends to bounce around quite a bit hence the deep blades beneath the base plate. Often times sand bags would be stacked on top as well. Nate is absolutely correct as the tubes house recoil mechanisms. Interestingly the French were the first to incorporate an effective recoil mechanism in their famous 75mm howitzer. Which provided an exceptionally high rate of fire and accuracy and was hence widely copied.
Likewise a characteristic of mortars is their high rate of fire.
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Post by thetundrafox on Jul 28, 2016 17:29:56 GMT -5
Very cool. Will you use this in games? I'm currently scouting different mortar designs as me and some buds are trying to develop a pyrotechnic one for our games.
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Post by wwiiguy on Jul 29, 2016 16:51:15 GMT -5
Droop you always do great builds! I am always excited when i see that you have made a thread
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Jul 29, 2016 17:10:24 GMT -5
I second that!
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Post by droopaille on Aug 1, 2016 12:17:18 GMT -5
Thanks for explanations of the recoil system, I really understand the design now. In mine, I will glue this part.
Thanks for comments, this is why I made them.
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Post by droopaille on Aug 11, 2016 14:07:42 GMT -5
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Aug 30, 2016 20:37:27 GMT -5
What would estimate is the range (in meters) and rate of fire. (Rounds you could fire in a minute?)
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Post by droopaille on Aug 31, 2016 6:37:08 GMT -5
ROF is about one shoot every 3-4 sec, it only depends of the number of ammunition you have. But, I cheat a bit in the vid, the full scale image shows the real range : about 2-3m, lol yes it is a big fail !! In fact, the motor is a CO2 canister but in my case, the hole of the percution is too small, not enough weight so there is only a big pchhhhhhhhhhiiiiiittt In the firt trial, the canister is alone in a smaller tube, tho hole is good but the canister is not aerodynamic and range is bad because of the weird trajectory. Let's go on
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Aug 31, 2016 13:28:43 GMT -5
Trying to power from a pierced CO2 cartridge requires an expansion chamber for the leaked gases to build up pressure which takes some time. To generate decent power this gas has to be released quickly as with a ball valve or a similar device. I tried an approach like your as it seemed logical but like you the gas just fizzled and my rounds barely cleared the chamber. Also in order for the round to slide easily down the tube there must be some gaps between the round and the tube. This also squanders power.
Typically an effective airsoft mortar needs an external gas source and some kind of pressure release system once the round is in place. One approach I have seen work well is the use of Mosscart type canisters married to a tube containing a Nerf rocket. This shell is dropped into the tube, a firing pin at the base of the tube triggers the Mosscart primer and the rocket is launched. range is about 120 meters. An expensive approach as Mosscart each cost a lot.
External gas is the best way to go from a performance perspective (range 300 meters plus) but you have to squeaze the nerf rockets down the tube with a ram rod and trigger you release of gas. (Less cool visually than yours)
Mortars definitely add a new demensions to airsoft battles. If the terrain is moist fireworks mortar rounds are quite effective and very impressive visually. One can get quite good at creating either airbursts or ground strikes that in the daylight look just like white phosphorous rounds.
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Post by droopaille on Aug 31, 2016 14:34:35 GMT -5
I know your system for expansion of co2 canister and valve but in my case this is not the same : I use the reaction power not the pressure power. In our last OP artillery was managed with fire balls : sound, light and smell were very good. The most great moment was when a guy trow soil on we during the bombing time
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Aug 31, 2016 22:18:56 GMT -5
Nice effect. Very cool. We have done events where pyro simulated explosions were emplaced before the fact and set off electrically near (but not too near) the players. The effect was very immersive.
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Post by droopaille on Sept 14, 2016 14:47:52 GMT -5
This is the rocket I use in my last video.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Sept 14, 2016 18:56:54 GMT -5
A CO2 cartridge is capable of producing up to 600 psi (plenty enough power to launch a nerf type rocket for hundreds and hundreds of yards but the open space created by the fins let's all that power rush out without pushing on your projectile. With a long enough tube and a super tight fit you would still only get a minimal amount of force.
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Post by tact2jager on Oct 31, 2016 14:27:23 GMT -5
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