Cutting Spring - Improved ROF

venture · November 21st, 2009, 22:46

Anyone ever try this:

Take an over strength spring (more power than you want), say an M140 for example. Cut maybe 15% of its length away, making sure that it is still long enough to touch both the piston head and spring guide base when fully extended.
Now do we have M120 power with a high ROF?

m102404 · November 21st, 2009, 22:49

I would bet no.

I've cut down guarder springs that were a bit too spicy. The went from 440fps to 400fps. The ROF when they were cut down was about the same as any other spring shooting 400fps.

Now...I can't say for sure about a non-linear M140 spring...never tried that particularly.

ThunderCactus · November 22nd, 2009, 01:08

A 400fps spring is a 400 fps spring is a 400fps spring.
Every 400fps spring should, in theory, give you the exact same amount of resistance

Con Murder · November 22nd, 2009, 02:28

Increase ROF with a Mark III mosfet and lipo, you can set that thing to buzz a mid cap in seconds!

etd · November 22nd, 2009, 23:01

Spring length gives you compression adding to the tension. If you cut a spring you lose compression therefor tension. This will lower your fps. If its a non linear spring you might be okay. You won't lose to much depending on where the coils are compressed. If its a linear spring you are looking at massive fps changes. I cut my m120 because it didn't fit in my v3 gearbox with bearings. Before cutting it cronied at 405. I cut 4 sets of coils off. Now its down to 492 ish.

Think of it as the air seal in your cylinder. If you poke wholes in your air nozzle you will lose fps.

Quote:

Originally Posted by ThunderCactus

A 400fps spring is a 400 fps spring is a 400fps spring.
Every 400fps spring should, in theory, give you the exact same amount of resistance

chaosnemesis · November 23rd, 2009, 11:24

The energy needed to yield a 400fps result is kinetic. even though the cut spring is shorter, the spring itself is made stiffer. This means both a cut m140 and an unmodded m120 that gives you 400fps both require the exact same energy to compress. which means the same strainon the motor and exactly the same rof. doesn't matter that the spring itself is shorter it still needs and gives m120 energy.

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November 21st, 2009, 22:46	#1
venture Trader rating Join Date: Jun 2005 Location: Halifax	Cutting Spring - Improved ROF Anyone ever try this: Take an over strength spring (more power than you want), say an M140 for example. Cut maybe 15% of its length away, making sure that it is still long enough to touch both the piston head and spring guide base when fully extended. Now do we have M120 power with a high ROF? __________________ Visit us at :www.ventureairsoft.ca

November 22nd, 2009, 02:28	#4
Con Murder Trader rating Join Date: May 2009 Location: Lethbridge Alberta Canada	Increase ROF with a Mark III mosfet and lipo, you can set that thing to buzz a mid cap in seconds! __________________ Con Murder Dark Rhino L.A. Airsoft

November 21st, 2009, 22:49	#2
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	I would bet no. I've cut down guarder springs that were a bit too spicy. The went from 440fps to 400fps. The ROF when they were cut down was about the same as any other spring shooting 400fps. Now...I can't say for sure about a non-linear M140 spring...never tried that particularly.

November 22nd, 2009, 01:08	#3
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	A 400fps spring is a 400 fps spring is a 400fps spring. Every 400fps spring should, in theory, give you the exact same amount of resistance

November 23rd, 2009, 11:24	#6
chaosnemesis Trader rating Join Date: Nov 2008 Location: Toronto	The energy needed to yield a 400fps result is kinetic. even though the cut spring is shorter, the spring itself is made stiffer. This means both a cut m140 and an unmodded m120 that gives you 400fps both require the exact same energy to compress. which means the same strainon the motor and exactly the same rof. doesn't matter that the spring itself is shorter it still needs and gives m120 energy.

Cutting Spring - Improved ROF

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