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All Springer/NP/PCP Air Gun Discussion General > Tuners

.25 Dragonfly MK2 by Wes Bashforth.

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WesBob:
Looks like my two Chinese chronographs (different makes) are in agreement but in error if I was getting close to 50fpe at 20 pumps  and your getting 37 at 15. :-[ ;D
I need to get an fx chronograph in the shop to check these out I think. I could not believe my eyes when I was getting 1000fps with the 25.4 gr pellets so I tried a different chronograph and it was just under 1000 with it. Anyway it's putting out some great power!
The mods were pretty simple. Just drilled out the valve port and barrel port and then the biggest modification for speed gain was the easiest of all. I just swapped out the overpowered hammer spring for a Stormrider hammer spring. The Dragonfly hammer spring is making that hammer wack that valve stem so fast its opening and closing super quickly then draining the rest of the air out because the hammer spring is stronger than the valve spring and whatever air is left over. So with the stock spring after five or six pumps you're not really gaining much. With the Stormrider hammer spring it is hitting the valve slower and opening the valve longer so you get all the air out the barrel in one shot and it seriously increases velocity. If you take your Dragonfly and chopped some of the spring length off a few coils at a time you'd see the velocity jump way up.

Spacebus:

--- Quote from: WesBob on December 14, 2022, 03:22:58 PM ---Looks like my two Chinese chronographs (different makes) are in agreement but in error if I was getting close to 50fpe at 20 pumps  and your getting 37 at 15. :-[ ;D
I need to get an fx chronograph in the shop to check these out I think. I could not believe my eyes when I was getting 1000fps with the 25.4 gr pellets so I tried a different chronograph and it was just under 1000 with it. Anyway it's putting out some great power!
The mods were pretty simple. Just drilled out the valve port and barrel port and then the biggest modification for speed gain was the easiest of all. I just swapped out the overpowered hammer spring for a Stormrider hammer spring. The Dragonfly hammer spring is making that hammer wack that valve stem so fast its opening and closing super quickly then draining the rest of the air out because the hammer spring is stronger than the valve spring and whatever air is left over. So with the stock spring after five or six pumps you're not really gaining much. With the Stormrider hammer spring it is hitting the valve slower and opening the valve longer so you get all the air out the barrel in one shot and it seriously increases velocity. If you take your Dragonfly and chopped some of the spring length off a few coils at a time you'd see the velocity jump way up.

--- End quote ---

Is the barrel choked?

EdinGa:
Not a Dragonfly, and it only makes 15 fpe but it's a short range hammer. Quiet too. Notice the lack of ldc... Don't need one with this baby. I've always wanted a .25 pumper, so I built it and now Wes blows it out of the water.  ;D

Back_Roads:
 :o No clue the DF had so much HP hiding under the hood  8) ;D

WesBob:

--- Quote from: Spacebus on December 15, 2022, 06:18:33 AM ---

Is the barrel choked?

--- End quote ---
It's a 25 cal Stormrider barrel I put on there and no it doesn't seem these are choked.

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