My auto(cocking)-spyder

[LittlePaintballBoy]

put a back block on there somehow, that would be so sweet.

[xen_100]

why? the whole point of putting the ram at the back is to get rid of the back block. to have a back block you have to have an extented bolt. more weight, more drag = slower cycle speed.

[LittlePaintballBoy]

but it would look cool!

[TigerMan]

That's awesome that you did that. Not many people want to take the time or energy to make something truely unique to their own. Props to you for doing that.

BTW, you still got that awesome Shutter?

[xen_100]

yup......still got it........dont play with it as much now that I have my mag biult, but I still have it.

[sneakyhacker420]

[nicad]

Xen-
your correct about the piston diameter vs. operating pressure. but what your not looking at is the size of the ram's shaft remains the same, and it takes away from the piston plunger surface area only on the front side.. the side you want the most force to recock with. the larger the piston, the less offset the shaft will play. numbers:

assume all ram shafts are the same (.125") which is true with the exception of palmers's and some other crazy ones.

surface area of shaft = 0.012 in^2
surface area of miniram (not exact but close to .25") = 0.049 in^2
surface area of typical cocker ram (.375") = 0.110 in^2

since the miniram's surface area is just about half of a normal ram's, you have to run almost double the pressure for the same force pushing OUT-

100 psi x 0.049 in^2 = 4.9Lbs of force for miniram.
44.5psi x 0.110 in^2 = 4.9Lbs of force for regual ram.

now at those pressures look at the force pulling IN (you have to subtract the surface are of the shaft 0.012in^2 from the plunger's surface area)-

100 psi x (0.049in^2 - 0.012 in^2) = 3.7Lbs of force for a miniram pulling in, or ~75% of the force pushing out.
44.5psi x (0.110in^2 - 0.012 in^2) = 4.3Lbs of force for a regular ram pulling in, or ~88% of the force pushing out.

sooooo... if you run a 3/8" cocker ram, you will have more pulling force vs. pushing force (i think 13% greater) as opposed to the miniram.

trust me, iv been there.
hope this helps.
out!

[sps16]

wow that thing is scary, but cool

[xen_100]

Originally posted by nicad
Xen-
your correct about the piston diameter vs. operating pressure. but what your not looking at is the size of the ram's shaft remains the same, and it takes away from the piston plunger surface area only on the front side.. the side you want the most force to recock with. the larger the piston, the less offset the shaft will play. numbers:

assume all ram shafts are the same (.125") which is true with the exception of palmers's and some other crazy ones.

surface area of shaft = 0.012 in^2
surface area of miniram (not exact but close to .25") = 0.049 in^2
surface area of typical cocker ram (.375") = 0.110 in^2

since the miniram's surface area is just about half of a normal ram's, you have to run almost double the pressure for the same force pushing OUT-

100 psi x 0.049 in^2 = 4.9Lbs of force for miniram.
44.5psi x 0.110 in^2 = 4.9Lbs of force for regual ram.

now at those pressures look at the force pulling IN (you have to subtract the surface are of the shaft 0.012in^2 from the plunger's surface area)-

100 psi x (0.049in^2 - 0.012 in^2) = 3.7Lbs of force for a miniram pulling in, or ~75% of the force pushing out.
44.5psi x (0.110in^2 - 0.012 in^2) = 4.3Lbs of force for a regular ram pulling in, or ~88% of the force pushing out.

sooooo... if you run a 3/8" cocker ram, you will have more pulling force vs. pushing force (i think 13% greater) as opposed to the miniram.

trust me, iv been there.
hope this helps.
out!

OK, I got ya.........I think I will stick with the mini for now. the main reason I went with it is cause I got it really cheap. al three parts(ram, LPR, 3-way) for $80.

[xen_100]

Originally posted by sneakyhacker420

palmers pursuit products. take a look at thier "fittings" section. they have lots of cool stuff in there.

[xen_100]

Well I got to play with it today........it is soo nice........shoots nice, but i need a better loader (was using a vl200 ) once i get a better reg and a drop for this, it will freakin rock!

it is very quiet too, I was suprised. I had to put the lightest main spring in it to even get it to chrono under 300FPS. even then I had the adjuster almost all the way out. of course that was at 350PSI, once I get the reg for it, I bet I will be able to turn it down to about 200-250 PSI.