Seasonal Power

[Rez 4,957]

Anyone else notice there PCP's drop a tad during winter?

 

For example, my 100. It hasn't been used in a little while, just sat, so I dropped it over the crono today and noticed it's down on power. Same everything, pellets and so on. It was @ 11.1, now its down to 10.6, 12 shots into a full tank.

 

Its not something Im worried about at all. Happy with it whatever, but the general thought is its down to the weather.

So, yeah, thought Id put it out there.

[Durham John 693]

Most noticed with co2 usually go up s canny bit in the summer.

[mark williams 7,549]

Can`t say i`ve noticed any change but unless crono`d i don`t think half a foot pound would .

[steg 609]

Hope not that much...mines doing between 11.5 and 11.7 this time of year with a few different pellets..EEK!?

[treecreeper 1,136]

Down to ambient temps, air expands when warm, that's why you want your cylinder filled slowly and preferably sat in cold water or you won't be getting what your paying for. It could also be the lube thickening up.

Edited March 1, 2016 by treecreeper

[David.evans 5,323]

Bang on right there tree creeper !

Atb

[steg 609]

Probs explains why mine is shooting like that then for this time of year...

This house is a proper oven since i got the combi boiler in and 4 extra radiators. Fill mine inside and then go out to use the chrono so i guess i'm shooting in summer temps really? Hopefully i won't see an increase in power over the hotter months.

[villaman 9,979]

One down fall with the Hw100 , grease, unless you have cleaned out all of the grease ,then oil with a few drops of light gun oil

[jamesS410 106]

Probs explains why mine is shooting like that then for this time of year...

This house is a proper oven since i got the combi boiler in and 4 extra radiators. Fill mine inside and then go out to use the chrono so i guess i'm shooting in summer temps really? Hopefully i won't see an increase in power over the hotter months.

If you fill inside and mostly go straight out in to the cold you may even see the power drop in the summer (depending on just how toasty your new boiler keeps the house and how warm your cylinder gets when it's filled ) It's the difference in temperature that causes a difference in pressure. If you fill quickly without letting the cylinder cool then go straight outside in to the cold winter air there will be a greater difference in temp (and hence pressure), hot air tries to take up a greater volume than relatively cooler air so whilst it's warm will give more psi in your cylinder. If you leave the cylinder temperature to equalise with the cooler air the difference is reduced and as a result the pressure in the cylinder relative to the external air pressure drops and you get fewer shots per fill and potentially a slightly less powerful PCP As an aside, my wife tells me I'm not very good at explaining myself and having re-read that paragraph I'm starting to think she may have a point

[villaman 9,979]

I think she might be right

 

But i know what you are talking about

[Rez 4,957]

My HM is down a touch too, to 10.4, still bangin on the door of 9ft/lbs of retained energy at 40 yards though, which I struggle to believe, but it's what chair gun informs me.

[steg 609]

Appreciate that James..loud and clear to me. Think i'll let everything acclimatize outside next time and even fill her up outside and see if there's a difference.