Tuning Airforce condor tune.

[Raden1942]

So I started with just assembling my daughters new 20 cal airforce talonp. And got this shot string. 

I tried to do nylon washers to tune it but they kept deforming or creeping up the tophat. These were the numbers but I didn't do it right. 

Finally I just used an Oring with 1/4 ID, 7/16 OD, and 3/32 thick on power level almost max at 13. The .123 ring loc and got this! Tomorrow I'm going to put back on the .70 ring loc and hopefully get over 500 fps and tons of shots. My daughter doesn't need speed but I needed a more pronounced shot curve to tune the oring mod. 

It's really unbelievable how much better that is. 

 

[Raden1942]

OK so I just did some calculations and that's 49 shots with an ES of 31fps and a SD of only 7.95 fps. I'm pretty happy with that. If I take of the last 3 shots and count 46 Id get an even tighter SD. Thanks to all the folks that helped me with figuring out that mod. Hope you all are dealing during this crazy time in our history. God bless. 

 

[bambuino]

Those are nice numbers. I going try that tune on my .25 TalonP. In a mood to sloooow things down a bit of late, see if can't get down to 15 ft/lb. My 7 yo likes this rifle too.

 

[JamesD.]

Glad to see you enjoying it and thanks for posting. 

 

[MrP]

If you near the maximum fill of the tank and then dial the hammer spring down to one and shoot very light pellets you may be able to get very small puffs producing 15 fpe (with a small valve cap in place). Recall that with these guns a slow heavy projectile results in longer valve dwell time due to pressure behind the slug for the time it is in the barrel. Combining a little valve lock with light projectiles works great. I have a feeling this is not what you're looking for though because this isn't exactly a "tune" and as soon as the gun drops to around 2500 psi it will start shooting faster. Works for me as a plinker though

I may have mentioned before I see my Air Force guns as having two tunes in one. I put some higher pressure thick walled aluminum tanks on, if i pump up close to 4000 psi I can get a huge string of low FPE shots using the light projectiles shooting from 4000 down to 2900 psi. At around 2900 psi velocity begins to climb as the valve opens more easily even at lower hammer pre load. 2900 down to 2000 psi is like a different gun. Sometimes I just shoot down to 3000 and then punmp back up to 4000 again... never really let the valve open fully and never shooting at ideal pressure. When I want the full power experience I don't have a quite as much and I love the hammer spring and then it's consistent and powerful. But I'm obviously not going for minimal extreme spread here at all! Probably worthless advice since I am neither a hunter nor a marksman. I am a tin can sniper mainly.

 

[Raden1942]

Well that's good to know. I am happy with the tune I was able to get with the oring. Apparently at the higher pressure 2700 to 3000 the oring does nothing. The extra pressure keeps the dwell time low. When it would normally be getting longer dwell time on lower pressure the oring stops it and when done right matches the dwell time of the high pressure giving you a simulation of a reg. It's not perfect but more than enough for what I do. As far as changing velocity I'll just switch top hats. It's super easy.