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Xlucine

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Posts posted by Xlucine

  1. I've been having a think here, and have come to the conclusion that historicity rather than realism may be the most problematic factor.

    As an example, think of how much better WoWP would have been if, instead of real-world designs it had used the same class approach (fighters, GA, heavies and so on) on clean-sheet designs inspired by real aircraft.

    It could be perfectly realistic (use X-plane or something to model flight characteristics and keep the old weapon/damage model) without having the baggage the real aircraft bring along. Plus, balance becomes the infinitely easier.

     

    Historical balance is the least of WoWP's issues

  2. Anybody know how we can prevent that here?

     

    It looks like here has "show all" set as default. Of course, no way of knowing for sure until february

     

    Oh fucking really? How do you make it not do that?

     

    On TN, at the top of each board there's a bar with buttons for "recently updated", "start date", etc - different ways to filter the threads. right hand side of the row of buttons is called "custom", you can set the desired cutoff date in that

  3. Keep in mind, the pressure being produced is high, but the area's very low, so the force involve is also probably low (assuming 60,000 PSI and 1mm diameter, that means 3.27 Newtons force are being exerted on the primer. This is equivalent to the force of gravity on something that weighs 2.4 ounces). A third theory is that there's enough pressure escaping around the primer to equalize the pressure on it. I think this is probably likely.

     

    Erm, I think you made a mistake in that calculation - 60000 psi over that radius comes out around 300N, not 3N

    http://www.wolframalpha.com/input/?i=60000psi+*+%281mm%2F2%29^2+*+pi

    That's pretty significant for such a thin sheet of brass. You do have a good point about the bolt keeping the rest of it in - I'd forgotten it was so close around the firing pin. As for the pressure release, it sounds odd to me - the path from the propellant to the primer is quite open, so you ought to end up with a substantial amount of gas blowing past the primer if it is going to equalise the pressure. Also, with that gas cancelling out the chamber pressure, you shouldn't expect to see machining marks on the primer surface

  4. Or more specifically, why don't they burst? You have huge pressures behind them, they're thin and not really solidly fixed in place, and yet they are expected to stay intact - how?

     

    Me and colli were discussing this on TS yesterday, and there's no way inertia of the firing pin could be providing meaningful support - from squinting at a pressure Vs time graph of a 30.06, and assuming the firing pin can be modelled as a piston of radius ~1mm acted on by the chamber pressure, the applied impulse is on the order of kgms-1. So that firing in should be moving backwards at a considerable velocity, given the light weight, and over the ~1millisecond of the firing process it should move several mm back - yet primers retain the impression of the firing pin after firing. The peak force applied was on the order of kN, so I'd be very surprised if the firing pin spring was providing enough of a force to resist this

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