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Mars/cobalt Kinetics Rifle Design


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Run into problems with a combination of polymer cases and PETN based propellant (probably derivative of PE2N2A).

Edited by bojan
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From the slides and the Textron NGSW submissions, I thought that case-telescoped ammunition was still going strong as one of the contenders? Or are you talking about a different program?

 

Yes, but prolelant was changed from PETN* based to unknown (friend is guessing RDX based propellant*.

 

 

* '80s called and want their "what did you mean, it wasn't made on drugs" high-energy propellants.

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I take it the heat sink factor of brass cases isn't that important after all?

 

Brass actually transfers heat into the chamber. The plastic cannot really transfer heat to the chamber, so it is cooler in the first place.

 

 

Thank you for clearing that one up for me.

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Run into problems with a combination of polymer cases and PETN based propellant (probably derivative of PE2N2A).

PE2N2A sounds intriguing. I have never heard of it until now and cannot find a reference for it. Could you share more details about it, please?

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Basically PETN with two nitro groups reduced to amino groups (-NH2) which moves it from high explosives into (very) energetic propellant territory. Read a snip locally long time ago while still at university, it was tried as a propellant for a small rockets (in particular for boosters) in the '80s by multiple countries (US, France, Germany). Looked promising, but it is far from cheаp and burns at very high temperatures, so standard AG-4 (grass reinforced phenolic resin) insulation that is often used on small rockets could not deal with it.

I have no info if it is actual propellant used, but since propellant was noted to be PETN based, it (or some similar desensitized PETN derivate) is kinda logical assumption.

Edited by bojan
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How are today's optics compared to the old iron sights and what is the difference in training with the two?

Thank you.

 

 

There is no reason to have irons other than as a backup to your backup reflex collimator. Optics make everything better.

 

 

Optics certainly make things easier. A scope or reddot is just putting the dot on target and you got it. scopes also magnify adn ake spotting the target easier. Whereas with iron sights you have to line up three parts: rear sight, front sight and target. You have to teach the prospect rifleman how to properly focus his eyes on front sight and target and not the rear sight. Also to put the face ion the right and repeatable way on the rifle. A reddot is much more forgiving, scopes depend on the model though general issue scopes normally are built to be used with not optimal hold in mind.

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