Crony's for AR from Airwolf MCT w/Heliboard

AR and I have been exchanging PMs and I thought I'd post the answer here to one of his questions on fps / accuracy so others could see as well.

JSB 18.13 spread 9 st dev 3

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AA 16 spread 7 st dev 2.3 

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JSB 14.34 spread 9 st dev 2.4

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Groups from top to bottom are JSB 14.34 (group 2), AA 16 (group 7) JSB 18.13 (group 12). No sorting on any of the pellets. The circle on the JSB 18.13 is one shot I know I pulled high. It is cold and gusty here so this is shot on an my indoor 20 yard range. That entire square is 1" by 1" so the center red dot sits in a .2 by .2 box. 

Basically pellet on pellet accuracy. it does about the same (groups open slightly) out to 40 to 50 yards with no wind. Everything is left of center and a touch high as I didn't bother to dial in the scope before shooting groups.

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To Eddies question on the.25. For our .25 AW MCT's If we could pump these guns up to 935-950 FPS with the 25 gr pellets? That would allow us 820 + or - with the 33 gr. pellet.
Then on low power 850 + or - that we get now with the 25's about 125 shots a fill.
I emailed the HELI Board guy with this question. He said the mother board is the same on all calibers. But due to the .25 pellet weight? He could get me to about 900 fps for 15 to 20 shots per fill. Its not worth it. If you have a .22 AW? !!!! DAMN you have options.


Dennis
 
Just installed Heliboard in my 7yr old MCT .22 cal rifle. I'm low on air (188 bar in bulk cylinder) so no real testing just yet. My fire station contact is in Puerto Rico on assignment so hopefully I can another helpful chap.

VERY INTERESTING ISSUE: My AirWolf MCT trigger was wired CLOSED contact nominally (at rest) and OPEN contact upon trigger being pulled. The Heliboard expected just the opposite. It was a minor problem to correct since the micro switch in the trigger has 3 terminals and by switching the wire on back side of switch to the center terminal gave me a close to fire. I would have really been screwed if switch hadn't had the other option! Can anyone say "release trigger"? Can't believe I'm the only one with a MCT factory wired that way. It had daughter board but of course no chrono. 

With 180 bar I got 880fps on setting 9 with 18.1 jsb heavies. Same pellet on setting 10 gave me 930fps. My old board gave me 880 on Low (2) with 18 jsb's. Don't remember what high was since groups opened up a little and I didn't use it. I tried only 10 jsb exact 15gr and I didn't write it down but I think they were 970fps and had a spread of 2fps - also not sure rather setting 9 or 10 (for 10). I'm anxious to find if High on old board was bad due to harmonics and if so a little above or below might get me accuracy and power. Chrono'd with Combro CB625 since it works indoors and it's cold and dark out. When I get serious I'll use LabRadar which doesn't work well in my small shop but loves the great outdoors. My plan is to charge gun to 230 bar and shoot it down while noting the raw pressure values vs velocity. 
ANY TIPS?