Crono question

ADI34722

Hey guys,

You might be able to help me out here. I have a modded P90 from classic army. Havent done the work myself but had a shop do it. When it was cronoed infront of me in the shop she shot between 315 and 325 fps. After bringing it to a site they cronoed it at 1.65j. Didnt use it since and brought it back to the same place and once again from 315-325 fps on a .20 bb. Unsure about what to do next i went to another shop and it clocked in at 310-320 fps.

Is there a place you can bring it to have it check in the legal sence just to be sure.

dbmauser

is the chrono on site showing fps or m/s aswell? or is it just joules. the chrono cant calculate the energy(j) pruduced unless it knows the mass of the object. ones tha usually show j and fps together allready have a preset mass of the pellet(eg 0.2g) and will calculate it them selves

Ek = 0.5mv2
joules= 0.5 (bb weight in kg)(bb velocity in m/s)squared

NakedDex

Reason 1:
The shop is using heavier bb's during testing.
Reason 2:
The site was using lighter bb's during testing.
Reason 3:
Either/both the site and/or the shop had lighting incorrectly placed around the unit.
Reason 4:
A combination of 1 or 2, plus environmental factors.


Really, there's a lot of reasons. I would suggest you contact a friend with a chrono, another store or another site and have it tested with them for verification of one or the other.

This is also why I constantly encourage people not to upgrade power past 315fps@.2g. If you find that it actually fires 320-325fps@.2g consistently now, when the summer comes around the environment conditions could add anything from 5-20fps@.2g to that performance. It could even happen through simply travelling to another site (and it has done in a rather well documented case).

ADI34722

Cheers for the prompt responces guys. I use the G&G .20 bbs. From when she ran hot its been the same mag. Never changed the bb's and all done within 48 hours.

Arkslippy

ADI34722 wrote: »

Cheers for the prompt responces guys. I use the G&G .20 bbs. From when she ran hot its been the same mag. Never changed the bb's and all done within 48 hours.

I've had mine chrono at the same site several times and its always been the same within .1 of a joule, take it to a different site with their own bbs and get the same.

It's probably a kink in the testing procedure on site. Id bring it back with another rifle that had been tested off the same chrono in the shop, and if that's rating is the same on site, then it maybe human error caused by the procedures being used for the p90.

I did hear that painting guns with weird Orange and black stripes can cause issues too.

Inari

There is also the matter of the different brands of chronograph to factor in...and the fact that some are pure sh!te

ADI34722

Arkslippy wrote: »

I've had mine chrono at the same site several times and its always been the same within .1 of a joule, take it to a different site with their own bbs and get the same.

It's probably a kink in the testing procedure on site. Id bring it back with another rifle that had been tested off the same chrono in the shop, and if that's rating is the same on site, then it maybe human error caused by the procedures being used for the p90.

I did hear that painting guns with weird Orange and black stripes can cause issues too.

Funny F#$ker slippy.

The site in question use a Madbull Crono and all AEGs were under power after mine ran hot. Was fairly angry after she went hot but could have swore a switch on the left hand side was flipped by another marshell.

PS Arkslippy is my brother.

kev-Oakridge

ADI34722 wrote: »

Funny F#$ker slippy.

The site in question use a Madbull Crono and all AEGs were under power after mine ran hot. Was fairly angry after she went hot but could have swore a switch on the left hand side was flipped by another marshell.

PS Arkslippy is my brother.

Hey, if your around oakridge at the weekend, call up, I have a madbull chrono and we can check it out for you, see if maybe a button was hit by mistake