¿CAN YOU SEND ME THE PLANS? PLEASE! I need them ! i've to build one of these Trebuchet in this week ! my e-mail oscar_aguirre_01@hotmail.com Please Help me :(
I am working out the kinks in this device so that I can apply those lessons to larger projectiles, ie pumpkins. Not sure exactly how to do that with my small garage, but that's my eventual goal.
I have two ropes to reduce the load on the rope, and to keep the forces on the throwing arm more symmetric. It wouldn't do to have the throwing arm twisting due to 2000lb loads just before release - 1000lb on each side is much better.
Regarding the rope/spring comment, you are correct. I am redesigning the release mechanism to hold the CW at the top of the frame so that there's no tension on the CW cord when the trigger is pulled.
Instead of having two ropes on either side of the machine why don't you just have one. And one more question do think as soon as you release the arm the rope acts like a spring thereby jerking the arm forward and having the rope jump the notch in the sprocket.
@Idvance01 what do you plan to do overall do you plan to build something to fling pumping like in punkin chunkin or do you just want to see how efficient a trebuchet could be.
Well, I'm hoping so. I've got some design problems to sort out. I think I must figure out how to suspend the CW without holding it by the arm. The resulting spring in the cord immediately following release is the dominant source of the cord and projectile jumping out of their respective places.
Atkist: I guess I could rig up larger sprocket channels - probably make them out of aluminum stock to supplement the fender washers.
I'm pushing the weight ratio up deliberately high in hopes of applying the lessons to a pumpkin tosser someday. Looks like I can keep decent efficiency up to mass ratios of about 400.
Have you ever tried adding a piece of metal were the rope goes in the throwing arm in case the ball slips out of the sling so you don't have to keep replacing the throwing arm every time it breaks.
@ACDC5968: Hard for me to see exactly what you're thinking, but I do have a 'stopping sprocket' on the base of the throwing arm , which absorbed the great majority of the energy by bending nearly into a semicircle.
MAN did my left ear enjoy this video XD
hp0wn3r2 2 months ago
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¿CAN YOU SEND ME THE PLANS? PLEASE! I need them ! i've to build one of these Trebuchet in this week ! my e-mail oscar_aguirre_01@hotmail.com Please Help me :(
1993rakzo 4 months ago
I am working out the kinks in this device so that I can apply those lessons to larger projectiles, ie pumpkins. Not sure exactly how to do that with my small garage, but that's my eventual goal.
ldvance01 6 months ago
I have two ropes to reduce the load on the rope, and to keep the forces on the throwing arm more symmetric. It wouldn't do to have the throwing arm twisting due to 2000lb loads just before release - 1000lb on each side is much better.
Regarding the rope/spring comment, you are correct. I am redesigning the release mechanism to hold the CW at the top of the frame so that there's no tension on the CW cord when the trigger is pulled.
ldvance01 6 months ago
Instead of having two ropes on either side of the machine why don't you just have one. And one more question do think as soon as you release the arm the rope acts like a spring thereby jerking the arm forward and having the rope jump the notch in the sprocket.
ACDC5968 6 months ago
@Idvance01 what do you plan to do overall do you plan to build something to fling pumping like in punkin chunkin or do you just want to see how efficient a trebuchet could be.
ACDC5968 6 months ago
Well, I'm hoping so. I've got some design problems to sort out. I think I must figure out how to suspend the CW without holding it by the arm. The resulting spring in the cord immediately following release is the dominant source of the cord and projectile jumping out of their respective places.
ldvance01 7 months ago
I would call this a positive failure because of what you learned.
Good science, ID.
Walker@thehurl.org
WeBeTom 7 months ago
Atkist: I guess I could rig up larger sprocket channels - probably make them out of aluminum stock to supplement the fender washers.
I'm pushing the weight ratio up deliberately high in hopes of applying the lessons to a pumpkin tosser someday. Looks like I can keep decent efficiency up to mass ratios of about 400.
ldvance01 7 months ago
120 pounds is just an awful lot to throw a baseball with. Hope it's just the arm that needs rebuilding.
Deeper retaining channels on the sprockets?
The kilofoot is a great goal. Hope you can reach it.
akitist 7 months ago
Have you ever tried adding a piece of metal were the rope goes in the throwing arm in case the ball slips out of the sling so you don't have to keep replacing the throwing arm every time it breaks.
ACDC5968 7 months ago
@ACDC5968: Hard for me to see exactly what you're thinking, but I do have a 'stopping sprocket' on the base of the throwing arm , which absorbed the great majority of the energy by bending nearly into a semicircle.
ldvance01 7 months ago