The MURLIN is a high performance trebuchet (standing for Multi-Radius LInear Nodes) which uses variable length sprockets with a remote counterweight drop to get good launch efficiency at CW-to-projectile mass ratios up to about 400:1.  

Distances of 500-700 feet are commonly achieved.

Plans for golfball and baseball versions of this are included below.  I do not ask for compensation but if would be nice if references were to be included in any derivative reports, plus I hope you will think kindly of me if our paths ever cross.

Obviously, trebuchets throw projectiles at high speed with an inherent safety risk.  Please proceed with forethought and caution.

Thanks all, and enjoy!  If needed you can reach me at the below email address.

Leonard Vance