[WVMEDIC20 (Banned)]

I have a general question about barrel lengths and peoples opinion. I have usually used a 16" barrel on my NXT or DLX guns with the freak kit and have moved to a CF Boomstick that is either 15" or 17".... Are there any real tangible benefits going with the 17" barrel over the 15" i.e distance, accuracy, quietness, trajectory, etc?

Thanks for the info and opinions.

[Parasite]

Well, I'll be glad to share my $.02, but first, what do you think? You've shot both - can you see a difference?

To answer your question, only sound signature can be effected by barrel length; distance, accuracy & trajectory cannot. (emphasis on "length" - as all these factors can be effected in one way or another)

[ElJefe13]

Originally Posted by Parasite

Well, I'll be glad to share my $.02, but first, what do you think? You've shot both - can you see a difference?

To answer your question, only sound signature can be effected by barrel length; distance, accuracy & trajectory cannot. (emphasis on "length" - as all these factors can be effected in one way or another)

This. Also, a short (>12 inches) gets less efficiency, same if they get above 16 inches.
I'd definitely suggest going with the 15.

[Jinx18]

longer will be slightly more efficient and quieter

[crowntheking]

Originally Posted by Jinx18

longer will be slightly more efficient and quieter

Oh is that right?

Efficiency is based on you boring (amount of space around ball in the barrel) and sound signature will be based on porting.

[Jinx18]

Originally Posted by crowntheking

Oh is that right?

Efficiency is based on you boring (amount of space around ball in the barrel) and sound signature will be based on porting.

Yes it is right. The longer the barrel the longer the air used to propel can act on the ball. It will also be quieter since the pressure difference between the inside of the barrel and the atmosphere is lower.

Drop the attitude when you don't know what you're talking about.

[NJEmortal]

No real benefit, just preference and bunker manipulation. I agree with the comment above regarding efficiency and sound signature being affected by length.

14" to 15" seems to have the best sound signature with max efficiency.
Longer than 15" you'll see a slight decrease in FPS, from the 15", but a quieter shot.
Shorter than 14", you'll see a slight decrease in FPS, from the 14", less consistent over a chrono, and a louder shot.

[crowntheking]

Originally Posted by Jinx18

Yes it is right. The longer the barrel the longer the air used to propel can act on the ball. It will also be quieter since the pressure difference between the inside of the barrel and the atmosphere is lower.

Drop the attitude when you don't know what you're talking about.

I clearly know what I'm talking about. Are you implying that a longer barrel will be more efficient regardless of bore?

[NJEmortal]

Originally Posted by crowntheking

Oh is that right?

Efficiency is based on you boring (amount of space around ball in the barrel) and sound signature will be based on porting.

You're not wrong. Those are also factors in efficiency and sound signature, but he's asking about barrel length. If you jump from a 14" Deadlywind to an 18" Deadlywind, using the same insert, you'll see a 15-25 FPS drop which results in poorer efficiency.

[Jinx18]

Originally Posted by crowntheking

I clearly know what I'm talking about. Are you implying that a longer barrel will be more efficient regardless of bore?

You clearly have no idea what you are talking about if that is your response.

A 12" 0.689 barrel will be slightly less efficient and louder than a 14" 0.689 barrel. The same applies to a 12" 0.691 barrel will be slightly less efficient and louder than a 14" 0.691 barrel. The same applies to a 12" 0.679 barrel will be slightly less efficient and louder than a 14" 0.679 barrel. See where I am going with this.

It makes no sense to say a 12" 0.679 barrel will be slightly less efficient and louder than a 14" 0.689 barrel.

[crowntheking]

Originally Posted by Jinx18

You clearly have no idea what you are talking about if that is your response.

A 12" 0.689 barrel will be slightly less efficient and louder than a 14" 0.689 barrel. The same applies to a 12" 0.691 barrel will be slightly less efficient and louder than a 14" 0.691 barrel. The same applies to a 12" 0.679 barrel will be slightly less efficient and louder than a 14" 0.679 barrel. See where I am going with this.

It makes no sense to say a 12" 0.679 barrel will be slightly less efficient and louder than a 14" 0.689 barrel.

That's not what I'm saying, a 12 .79 would be more efficient.

[NJEmortal]

okay, so... I kinda have a lot of UL tips, a chrono, and a decibel meter. I'd be willing to film the test to see any benefit/draw to tip length while maintaining the same bore diameter, control bore length, and bore material.



Pictured is a 10", 12", 14", and 16"

[hmcl281]

Originally Posted by Jinx18

longer will be slightly more efficient and quieter

Originally Posted by crowntheking

Oh is that right?

Efficiency is based on you boring (amount of space around ball in the barrel) and sound signature will be based on porting.

Originally Posted by Jinx18

Yes it is right. The longer the barrel the longer the air used to propel can act on the ball. It will also be quieter since the pressure difference between the inside of the barrel and the atmosphere is lower.

Drop the attitude when you don't know what you're talking about.

the first post said longer barrel are more efficient, the second guy is questioning if that is true or not. we all know it's going to be less efficient if you keep going longer.


what's the max length for a barrel where the efficiency will start to go down, without porting?

[Jinx18]

Originally Posted by hmcl281

the first post said longer barrel are more efficient, the second guy is questioning if that is true or not. we all know it's going to be less efficient if you keep going longer.


what's the max length for a barrel where the efficiency will start to go down, without porting?

Yes there is obviously a length where the ball will start losing velocity. That happens when there is no more pressure differential acting on the ball. With a ported barrel it would be easiest to test since there are so many variables as well as not many combinations. Like NJEmortal said, take a Dye UL with a 10", 12", 14", 16" and whatever tips they make and run them over a chrono and see the velocity changes. I think that the length is going to be something way longer than what is generally accepted as a typical barrel length.

For unported you could get a rough idea (doesn't account for air escaping around the ball) using

P1V1=P2V2

P1= Pressure of dump chamber in spool valve bolt (HPR Pressure)
P2= Atmospheric pressure (14.696psi)
V1= Volume of Dump Chamber in spool valve bolt
V2= Solving for the volume here. This would be the volume of a barrel.

So

P1V1/P2=V2

Volume of a barrel is (pi)(r^2)(h)
r = diameter of barrel
h = length of barrel

Solve for length of barrel


That is a rough estimate of barrel length where velocity would start decreasing in an unported barrel.

[hmcl281]

always thought the max control length length was 8 or 10 inches, can not remember where i read it from

the problem with using a dye barrel system is the control bore length is so short, the good thing is that the tips do come in so many lengths.

[ibunkerupwnd]

So I'm looking I get a cf broomstick would the 17 inch 680 note be the quietest and most efficant

[NJEmortal]

Originally Posted by hmcl281

always thought the max control length length was 8 or 10 inches, can not remember where i read it from

the problem with using a dye barrel system is the control bore length is so short, the good thing is that the tips do come in so many lengths.

I'd run it with a CFBoomie, longest control bore I can think of with a large tip variety.

[hmcl281]

Originally Posted by NJEmortal

I'd run it with a CFBoomie, longest control bore I can think of with a large tip variety.

i keep forgetting the newer dye backs are longer

you ever done a comparison between the older/shorter back with the newer/longer back with the same bore size?

[drgonzo]

Max control bore for efficiency is in the 9-10.5" range. The ported length after can affect efficiency to a small degree also.

[Person]

Correct. For efficiency you are really looking at anything from 9-11 inches before you start needing more gas to push the ball out at good chrono speed.

in a 14 inch barrel like a Dye UL, or a freak, you literally have 4 inches of barrel, and 10 inches of muzzle brake..just venting gas waiting for the ball to get out of the barrel.

I always play with 12 inch barrels. If I needed to "wrap" in airball i guess I'd run a longer one. Normally I like not getting in my own way, though.

One way to test if you have a bunch of barrels is swap them out to the same gun and see what gives you the best velocity..that is the most efficient one.

Mostly guys like longer barrels because it makes it easier for them to aim.

[Parasite]

NJEmortal, I think that test you're suggesting would be great, as that relates to the op's question - what will be effected by changing tip length only.