Gearbox spring lengths

[Boo-Sabum Ben]

On the right, an original Cyma V2 spring.

On the left, an SHS M90.

What the deuce?

[dadio]

Re: Gearbox spring lengths

the cyma spring has been chopped short,you can see the end is not finished correctly,probably done because it was hot out of the box,very common in chiese guns.however there is quite a bit of difference in the length and design of springs,some are shorter and have a regular pitch and are really stiff,others are longer and have different pitch to the coils that allow a softer start to compression like the shs one.

[Boo-Sabum Ben]

Ah I see. It made it ridiculously hard to put into the gearbox. It would bend out half way between the sprig guide and the piston. Luckily the springs for the sopmod are that length, so I've swapped for a 280 ish spring anyway!

[loki7491]

Re: Gearbox spring lengths

As Dadio eluded to...

You can get the same power from entirely different springs.

Short, fat springs with thick gauge coils can give the same power as a massively long thin gauged spring. The SHS one on the left has varying pitches of thread. This will give the spring different compression and and expansion rates along its length allowing to act as its own shock absorber. It will also allow the motor to start turning with less oomph as it will compress the easy bit of the spring first.