membership ?

Viewing 10 posts - 1 through 10 (of 12 total)
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  • #41008
    Brad Walker
    Participant

    One more thing about membership. If I join NCR, is the membership based on a calendar year or does it run for a complete year from time of signing up.

    Thanks.

    #52687
    Ken Plattner
    Participant

    It runs for a complete year from when you join.

    Ken

    #52688
    SCOTT EVANS

    Hey…. WHats that formula up there?
    Am I supose to know that? 😕

    #52689
    Cineroc

    Hey…. WHats that formula up there?
    Am I supose to know that?

    only if you want to claim you’re a rocket scientist…

    Roger

    #52690
    Mitch Smith

    Unless my brain isn’t working correctly tonight…. The formula is for the acceleration of a rocket taking into account the rate at which the fuel is consumed along with the effects of atmospheric presure. Let us know how far I am off Ken.

    #52691
    Chris LaPanse

    I don’t see an atmospheric pressure term. It’s just a basic form of the rocket equation.

    (For that matter, it doesn’t even appear to have a gravity or drag term)

    #52692
    Ken Plattner
    Participant

    Right on, Chris. It’s the Ideal Rocket Equation – derived from the conservation of momentum of the rocket and fuel by Russian scientist Konstantin Tsiolkovsky in 1903 or so.

    Simplistically, P=mV, so you can say that mv of the rocket = mv of the fuel. For the rocket, m is essentially constant, but the velocity changes. For the propellant, the mass changes, but the exhause velocity of the burning fuel is constant.

    So,

    m delta V = V delta m

    mdv = vdm

    Do the integration, etc…

    #52693
    SCOTT EVANS

    Right on, Chris. It’s the Ideal Rocket Equation – derived from the conservation of momentum of the rocket and fuel by Russian scientist Konstantin Tsiolkovsky in 1903 or so.

    Simplistically, P=mV, so you can say that mv of the rocket = mv of the fuel. For the rocket, m is essentially constant, but the velocity changes. For the propellant, the mass changes, but the exhause velocity of the burning fuel is constant.

    So,

    m delta V = V delta m

    mdv = vdm

    Do the integration, etc…

    duh……….Hey Joe, what size motor should I put in this one? ……just give me the biggest one that will fit! 😉

    #52694
    Bruce R. Schaefer

    Scott E, don’t question a guy with a degree in advanced mathematics. 🙄 He will differentially equate your derivative in no time flat, not to mention integrate your limits!

    #52695
    Ed Dawson

    Thanks Scott. I have not laughed so hard in a while.

    Hey Joe, what size motor should I put in this one? ……just give me the biggest one that will fit!

    That’s what it all about, eh?

Viewing 10 posts - 1 through 10 (of 12 total)
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