Can a Mattress Spring Increase Tennis Ball Launcher Velocity?

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SUMMARY

The forum discussion centers on enhancing the velocity of a tennis ball launcher using stored mechanical energy, specifically by considering the use of a mattress spring. Participants experimented with various commercial springs but found them inadequate for achieving sufficient launch velocity. Key suggestions include reducing friction, decreasing the mass of the tennis ball, increasing the spring constant, and maximizing spring compression. Additionally, the design must account for air pressure issues if the ball fits snugly within the launch tube.

PREREQUISITES
  • Understanding of Hooke's Law and spring mechanics
  • Basic principles of projectile motion
  • Knowledge of friction reduction techniques
  • Experience with mechanical energy storage systems
NEXT STEPS
  • Research mattress spring specifications and their spring constants
  • Explore methods for reducing friction in mechanical systems
  • Investigate the effects of air pressure on projectile launch systems
  • Learn about optimizing mass for projectile motion
USEFUL FOR

This discussion is beneficial for hobbyists, engineers, and inventors interested in mechanical design, particularly those focused on building efficient projectile launchers or similar devices.

bkamer
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Me and two friends need to build a tennis ball launcher using nothing but stored mechanical energy to propel it. Our concept is similar to a mortar or cannon. We tried some comercial springs from Home Depot and even a spring from inside a sprinkler head, but the tennis ball does not have enough velocity to even get out of the barrel. We are considering using a mattress spring, but need some ideas on how to increase the velocity. Any suggestions are welcome. Thanks in advance.
 
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Think about reducing friction. If that doesn't help too much, the only options using a spring would be to reduce mass, increase spring constant, or compress the spring more. As you most likely know, this is due to:
[tex]F_{net}=ma[/tex] and
[tex]F_{spring}=-kx[/tex]
 
Last edited:
Is the spring end of tube open?
If not and the ball fits snugly in the tube, you have problems with air pressure.
 

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