9 replies to this topic

[hawk2009]

The chrony test is in no way a comparison or putting John's results down 300fps is a fantastic result , it is simply what I am able to get shooting theraband gold 25mm tapered to 20mm using 9.5mm steel.

[gamekeeper john]

good test hawk, as i said in the comment on the test i did yesterday i was shooting at a longer reach than normal, i have a long draw anyway and i was drawing about a extra 8" on top of that (almost semi butterfly), i have noticed when you pull your bands back you hold them fully stretched for a second or two, that will make you lose a lot of speed, u need to pull back and let go instantly for best results, i was shooting butterfly style earlier with a taper from 30mm to 15mm and getting over 400fps with a 9mm steel

Edited by gamekeeper john, 15 September 2011 - 11:07 AM.

[Charles]

Good tests, guys. I think these tests very well illustrate the effect of draw length on velocity of the projectile. The longer the bands have to accelerate the projectile, the higher the ultimate velocity.

John, your report of 400fps is truly amazing.

Cheers ..... Charles

[gamekeeper john]

Charles, on 15 September 2011 - 11:20 AM, said:

Good tests, guys. I think these tests very well illustrate the effect of draw length on velocity of the projectile. The longer the bands have to accelerate the projectile, the higher the ultimate velocity.

John, your report of 400fps is truly amazing.

Cheers ..... Charles

yeah 400fps, if u look on my youtube chanel u will se me hitting speeds of over 500fps, i did make a double tapered set that would shoot a 12mm lead over 300fps, john ~

[Charles]

gamekeeper john, on 15 September 2011 - 11:26 AM, said:

Charles, on 15 September 2011 - 11:20 AM, said:

Good tests, guys. I think these tests very well illustrate the effect of draw length on velocity of the projectile. The longer the bands have to accelerate the projectile, the higher the ultimate velocity.

John, your report of 400fps is truly amazing.

Cheers ..... Charles

yeah 400fps, if u look on my youtube chanel u will se me hitting speeds of over 500fps, i did make a double tapered set that would shoot a 12mm lead over 300fps, john ~

John, John, John!!! Under the current laws in Canada, any weapon with a muzzle velocity of 500 fps or more is a restricted firearm and one must have a Firearms Acquisition Certificate from the RCMP to own one ... Can you put a trigger lock on a slingshot???

And if you can fire a 12mm lead at over 300fps, I am sure that is also over the energy limits as well. You are going to get all of us Canadian slingshot shooters a trip to the crowbar hotel!!!

Cheers .... Charles

[marcus sr]

Charles, on 15 September 2011 - 11:47 AM, said:

gamekeeper john, on 15 September 2011 - 11:26 AM, said:

Charles, on 15 September 2011 - 11:20 AM, said:

Good tests, guys. I think these tests very well illustrate the effect of draw length on velocity of the projectile. The longer the bands have to accelerate the projectile, the higher the ultimate velocity.

John, your report of 400fps is truly amazing.

Cheers ..... Charles

yeah 400fps, if u look on my youtube chanel u will se me hitting speeds of over 500fps, i did make a double tapered set that would shoot a 12mm lead over 300fps, john ~

John, John, John!!! Under the current laws in Canada, any weapon with a muzzle velocity of 500 fps or more is a restricted firearm and one must have a Firearms Acquisition Certificate from the RCMP to own one ... Can you put a trigger lock on a slingshot???

And if you can fire a 12mm lead at over 300fps, I am sure that is also over the energy limits as well. You are going to get all of us Canadian slingshot shooters a trip to the crowbar hotel!!!

Cheers .... Charles

hahahahaha

[hawk2009]

gamekeeper john, on 15 September 2011 - 11:07 AM, said:

good test hawk, as i said in the comment on the test i did yesterday i was shooting at a longer reach than normal, i have a long draw anyway and i was drawing about a extra 8" on top of that (almost semi butterfly), i have noticed when you pull your bands back you hold them fully stretched for a second or two, that will make you lose a lot of speed, u need to pull back and let go instantly for best results, i was shooting butterfly style earlier with a taper from 30mm to 15mm and getting over 400fps with a 9mm steel

I had a feeling holding the band for anytime would reduce it's performance I think this also happens with tubes, I am going to run a chrony test on this also to see how much effect it has. As a target shooter this could have an effect as we pull the tube or band to an anchor point but if holding the pouch on each shot for different lengths of time has an effect on speed then it must also effect where the ammo lands on the target ie: higher or lower.

[gamekeeper john]

Charles, on 15 September 2011 - 11:47 AM, said:

gamekeeper john, on 15 September 2011 - 11:26 AM, said:

Charles, on 15 September 2011 - 11:20 AM, said:

Good tests, guys. I think these tests very well illustrate the effect of draw length on velocity of the projectile. The longer the bands have to accelerate the projectile, the higher the ultimate velocity.

John, your report of 400fps is truly amazing.

Cheers ..... Charles

yeah 400fps, if u look on my youtube chanel u will se me hitting speeds of over 500fps, i did make a double tapered set that would shoot a 12mm lead over 300fps, john ~

John, John, John!!! Under the current laws in Canada, any weapon with a muzzle velocity of 500 fps or more is a restricted firearm and one must have a Firearms Acquisition Certificate from the RCMP to own one ... Can you put a trigger lock on a slingshot???

And if you can fire a 12mm lead at over 300fps, I am sure that is also over the energy limits as well. You are going to get all of us Canadian slingshot shooters a trip to the crowbar hotel!!!

Cheers .... Charles

hahahaha, heres the videos, this one is 548fps with heated bands



heres the second, 12mm lead balls being shot over 300fps with none heated bands and a anchor point to my ear



the fastest i have ever shot a 9mm with none heated bands is about 450fps, to be honest i must have tries over 100 band sets and tapers in the last year lol, everyone says the thinner theraband is faster, so with theraband blue or black i could go even faster
the key things for speed testing is - pick a hot day, use a light weight pouch and let go of the ammo as soon as you pull it back,

[gamekeeper john]

hawk2009, on 15 September 2011 - 01:42 PM, said:

gamekeeper john, on 15 September 2011 - 11:07 AM, said:

good test hawk, as i said in the comment on the test i did yesterday i was shooting at a longer reach than normal, i have a long draw anyway and i was drawing about a extra 8" on top of that (almost semi butterfly), i have noticed when you pull your bands back you hold them fully stretched for a second or two, that will make you lose a lot of speed, u need to pull back and let go instantly for best results, i was shooting butterfly style earlier with a taper from 30mm to 15mm and getting over 400fps with a 9mm steel

I had a feeling holding the band for anytime would reduce it's performance I think this also happens with tubes, I am going to run a chrony test on this also to see how much effect it has. As a target shooter this could have an effect as we pull the tube or band to an anchor point but if holding the pouch on each shot for different lengths of time has an effect on speed then it must also effect where the ammo lands on the target ie: higher or lower.

yeah thats right, i cant work out why you cant get near 300fps with a 9.5mm steel though, they are only small light ammo, john

[Charles]

Thanks so much for posting those videos, John. Those big, heavy balls were sure moving your backstop around!

Cheers ........... Charles