Ranchero Chrony Results

One of the few truly high powered PCP airpistols on the market. Also known as FX8500/8500-22

Ranchero Chrony Results

Postby Kane on Fri Jan 01, 2010 11:58 pm

Hi all, my first post here. The Ranchero is my first FX gun and I am trying to learn a little bit more about it. Looks like I am in the right place :D

I chronied the Ranchero on all three power settings recently. For control purposes I shot three mags at 1m distance from the first sensor for each setting from a 200 bar fill . A Weihrauch silencer was fitted and I used AA Fields, a Shooting Chrony Alpha Master was used to get the results.A of A quote: High - 15 ft/lbs; Medium - 12 ft/lbs; Low - 8.5 ft/lbs. FX merely quotes the max power of 17 ft/lbs. Below is a summary of the results I got: (Full shot string on the attached PDF)

Ranchero in factory set up:

Low setting; first 16 shots went through at +/- 6.4 FPE

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Medium setting; first 16 shots went through at +/- 8.9 FPE

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High setting; first 16 shots going through at +/- 11.49 FPE

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As above except this time with the power selector flipped over to use the bigger vents. (Full shot string on the attached PDF)

Ranchero in low setting; first 16 shots went through at +/- 8.5 FPE

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Medium setting; first 16 shots went through at +/- 11.4 FPE

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High setting; first 16 going through at +/- 13.48 FPE

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Attachments
Ranchero Chrony Results PS flip.pdf
Ranchero chrony results with power selector flipped
(81.42 KiB) Downloaded 292 times
Ranchero Chrony Results.pdf
Ranchero factory setting chrony results
(117.75 KiB) Downloaded 353 times
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Re: Ranchero Chrony Results

Postby Graeme on Sat Jan 02, 2010 8:15 pm

Great stuff Kain 8-)

Looks to me like it prefers a larger port for shot consistency and a smoother tail off. Don't suppose you happen to know the size of the largest port ?
I currently have a 3.5mm with the thought it would slow the tail off but looking at your figures I'm not sure it would.

atb, Graeme
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Re: Ranchero Chrony Results

Postby makka on Sat Jan 02, 2010 8:29 pm

looks like it could do with a regulator :)
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Re: Ranchero Chrony Results

Postby Graeme on Sat Jan 02, 2010 10:18 pm

That would be nice but bare in mind it is only a pistol :) with a tiny air reservoir, cant be many pistols around with power like that.
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Re: Ranchero Chrony Results

Postby Kane on Sat Jan 02, 2010 10:54 pm

Alas Graeme, I was too eager to do the "flip" and chrony that I did not take the time to measure the hole diameters. I will be stripping it again in due course at which time I will be sure to take measurements.

Aside from the marginally better consistency from "FAC" vents, the shot count is about the same which makes a compelling case for keeping the PS flipped.

Next project; bash out a carbine stock...........................
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Re: Ranchero Chrony Results

Postby Graeme on Sun Jan 03, 2010 11:05 am

Hi Kain,
Yeas the results did surprise me a little, less spikes too.. might be an idea to back off the hammer spring with the large port to gain a slower decline in velocity. I'm looking forwards to fine tuning mine. Its a verminator with a ranchero name plate on the side, gawd knows why that is but anyways, basically the same action etc.. .trouble is once you take metal out you can not put it back, so i will keep an eye open for your post if you do get around to measuring that large port.
Once the kids go back to school I'll do a full shot string across the sweet spot with my 3.5 mm port and compare it to yours, hopefully that will give me an idea as to what to take the port size too.

Good luck with the stock.

atb, Graeme
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Re: Ranchero Chrony Results

Postby Kane on Sun Jan 03, 2010 8:59 pm

Yes, in pursuit of better consistency over 3 mags worth of lead my next step is fiddling with the hammer spring too. I have not worked with a FX before so I am not sure how much exactly to start with; perhaps a quarter turn at a time and test?
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Re: Ranchero Chrony Results

Postby Graeme on Mon Jan 04, 2010 2:39 pm

I'm in the same boat as you Kain, I've mostly worked on Theoben Rapids so its a case of feeling my way.

I think what i would do if i were you is wind the hammer spring right out counting turns as you go, and then test.. that could give you an idea of shot count/fps per turn so you would at least make an educated guess as to where you wanted it. You could even end up with a weaker but longer spring if the std one because to slack for your liking.

Good luck !
Cheers, Gra
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Re: Ranchero Chrony Results

Postby Kane on Mon Jan 04, 2010 8:19 pm

Thanks Graeme, i will give that a go.
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Re: Ranchero Chrony Results

Postby Kane on Wed Jan 13, 2010 9:07 pm

Graeme, I have not forgotten about the measurements; it is just that my Rancheros is with the friendly local stocksmith for a mod or two.
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