Monster QB transformed

[tworr]

It started here....


Then grew to this...



and mutated into a monster hunter.....






The stock is done in a oil paint and tung-oil mixture. The first coat with the mixture took a really long time to dry. The following coats were tung oil only and I was able to get a coat on early in the morning and another before going to bed.

I hope you like it. I do!!!

Here's the original thread with numbers.....
http://www.gatewaytoairguns.org/GTA/index.php/topic,1556.0.html

[dk1677]

Very nice work there!

[tworr]

Thank you!!

It's VERY light, well balanced and an absolute joy to shoot. I'm keeping this one for a long time!!

[tworr]

and here are my new numbers!!!!!!


21.1 Kodiaks
3000psi__________________2800psi

924.6____________________998.9
906.7____________________998.3
930.0____________________1011
973.6____________________1022
1007_____________________1026
1023_____________________1024
1031_____________________1019
1037_____________________1016
1034_____________________1005
1025_____________________994.9
1020_____________________977.9
1003_____________________966.3
996.7____________________952.1
987.6____________________935.9
966.8____________________919.9
951.4____________________888.9

[Bentong]

Nice shooter transformation! Stock looks fragile though with just little wood supporting the stock. I will be really cautious on handling for I might end up with a pistol QB. ‹(•¿•)›

[tworr]

Thank you!! 

The stock is much stronger than it looks. I wouldn't want to use it as a baseball bat, but it will be fine under normal use.

I do want to add a 1/2" threaded rod through the center of the thin part. I figured that it and gorilla glue would make it strong enough that I wouldn't ever have to worry about it.

[tworr]

Mwahahahahhahaha

I really have created a monster!!!

I decided to push for more power and go for less shots to be able to hit full power faster.

21.1grns =  52.56 fpe
25.4grns =  55.59 fpe
28.5grns =  58.52 fpe
32.4grns =  60.06 fpe.

21.1grn         25.4grn          28.5grn       32.4grn      
3000psi        3000psi          3000psi       2700psi
  
1024             941.9             908.0          900.4
1041             959.8             927.2          913.6
1059             974.7             944.0          910.6
1055             987.8             949.1          904.3
1051             992.7             961.5
1037             986.9             949.1
1020             982.4             937.4
1006             967.7             926.9

2000psi after 8 shots.


I need help. This is addictive!!

[Joshua A.]

That is some amazing stuff bro, i envy you for REAL! where does one aquire a monster QB as such? or did you build it yourself?

[tworr]

Thank you!!

It's been a long road. Two months of changes and testing and over 1000 pellets later I got the power up to where it is now.

I picked it up from a friend, but it was custom built and had exchanged hands one time before. Check the pictures out above where it started and the link of where it came from. It's just parts though and nothing you couldn't put together. If you can put a band aid on then your halfway there!! 

Here's what it was putting out when I picked it up.

25.4 grn               21.1 grn
3100psi                3300psi

911.3                   981
928.7                   990
943.2                   1004
949.1                   1011
944.1                   1006
942.5                   992
918.4                   987
912.7                   971

[Joshua A.]

ok thanks. That really is awesome man.

[tworr]

I wonder how heavy I can go?

Actually if I want to use the magazine I'm limited to 28.5 grain Eunjins. They fill the mag with no room to spare.

The 32 grain Eunjins are just too long for the mag The entire cone sticks out.

If I removed the mag brackets and made it single shot, I could use them with no problems.

I measure the mag at .375" and it's still able to turn with the 28.5 Eunjins that I measure at .389"




Here it is at 2900 and 2800 psi

21.1grns =  54.06 fpe
25.4grns =  57.55 fpe
28.5grns =  59.99 fpe
32.4grns =  61.71 fpe.

21.1grn         25.4grn          28.5grn       32.4grn       
2900psi        2800psi          2800psi      2800psi
   
1069             1001              948.2          902.6
1074             1005              960.9          907.8
1070             994.4             973.5          926.0
1059             985.5             960.6          923.8
1052             975.0           
1039             957.7           
1017             937.0           

[Joshua A.]

thats incredible

[Rickster]

I vote for the second picture.

The modified stock Looks fragile.

[Joshua A.]

well if it breaks he could always shorten the barrel too, and have a heck of a side arm companion for back up haha jk

[JonnyReb]

Nice job tworr,  beautiful gun and what a powerhouse!! Bet it IS addictive tweaking that monster.  J

[tworr]

what all is done to your TF89? is there any mods/tunes?

Not a thing!! Totally stock!!


Rickster - It's much stronger than it looks, but I'll end up drilling it and gluing in a threaded rod or a copper tube. I might even try to figure out a way to store pellets in it.

JonnyReb - Thanks J very addictive!

[tworr]

Blame the summer heat for more testing and numbers!!

I decided to use my down time to break the QB down and make a hammer debounce to conserve air, extend my shot count and lower the power levels for it to just shoot Kodiaks and JSB Monsters.

I have a 308 Condor on order that will be dedicated to killing midsize to larger game so that is why I decided to take the QB Monster down a notch where I can use it more.
 
I tested several combinations of felt, rubber and brass washers until I found a combination(rubber/brass/rubber/brass) that worked the best for me and kept the hammer slap noise down.


2800 psi
21.1grn
(same port from the last shot strings in October)

945.4
950.4
959.7
972.9
967.2
969.9
1036
1040
1024
1006
1003
986.7
973.3
948.3
944.0


Here I reduced the transfer port size.

21.1 grains
2800         3200         3300         3400

941           939.6        943.2        933.6
912           923.4        933.5        947.7
921           938.8        920.7        936.2
921.2        938.6        939.9        938.0
918.5        932.4        933.0        940.9
906.1        928.7        944.0        941.9
896.8        919.8        937.1        937.2
892.5        922.2        916.0        928.3        shot 8
896.3        919.6        927.1        934.3
879.7        915.7        921.9        912.7
872.4        914.2        916.0        922.8
867.2        896.9        913.1        910.0
858.5        895.2        902.2        912.7
847.4        888.5        897.0        911.9
829.4        871.6        887.7        898.7
               868.1        875.4        889.8        shot 16


It looks like 3200psi is giving me the closest numbers with at least 11 good shots and another 5 good usable shots.

It's also near silent with very little hammer noise now.

I'm very, very happy!!  

[rsterne]

I'd be interested in doing some efficiency calculations on your gun.... If you know the volume of the air reservoir please post it, along with the pressure at the beginning and end of the shot strings....

Bob

[tworr]

I'll look at my notes and measure the tube when I get home. Maybe you can come up with the cc of air from that. It's a short tube and limited on air.

[rsterne]

Inside measurements will work.... diameter and length....

Bob