1. 2 weeks ago

    Hey everyone,

    I was wondering if any of you had the chance to calculate the speed of your catapults. If so, would you mind sharing? We want to see how other teams are doing in terms of speed, so we have an idea of what speed to shoot for.

    Thanks

  2. Xenon

    Dec 28 Long Beach, California 99999V

    firing speed or loading speed? both are pretty fast. ours is fully drawn back in no more than 2 seconds. its a 2 393 motor 1:7 ratio.

  3. 7517H

    Dec 28 Malvern,PA 7517H

    Ours is 2 200 rpm V5 Motors with a 1:7 gear ratio.

  4. we are looking for the speed of the catapult arm as it fires. Is there a way to find the speed given gear ratio and motor type?

  5. Xenon

    Dec 28 Long Beach, California 99999V

    @skate17 we are looking for the speed of the catapult arm as it fires. Is there a way to find the speed given gear ratio and motor type?

    oh wow, well its quite fast. no measurements here, but it uses 4 rubber bands on each side, and goes really fast.

  6. callen

    Dec 29 Braintree, MA, USA

    @skate17 we are looking for the speed of the catapult arm as it fires. Is there a way to find the speed given gear ratio and motor type?

    No, there is no way to calculate from there. You could theoretically calculate from mass (including ball(s)), mass distribution (including ball(s)), elastics, behavior of the elastics, and the way the elastics are stretched. But that would be really hard.

    Better would be to use it, film the projectile, and determine from the film.

  7. terminalvelocity

    Dec 29 Bloomfield Hills, Michigan 39X Terminal Velocity (formerl...

    @callen Better would be to use it, film the projectile, and determine from the film.

    +1

    We are going to try this method out and will pm you with results.

  8. @terminalvelocity +1

    We are going to try this method out and will pm you with results.

    Ok thanks

 

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