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Destabilization speed for Diablos

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cavedweller

cavedweller

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Dec 5, 2018
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It has become apparent to me as I am learning from all of you, that at a certain speed (FPS) Diablo Pellets, generally speaking, experience in flight Destabilization due to their shape in general.
I wonder if people here could chip in with what they have noticed that "do not exceed" speed is to them, yes i know, barrel type, spin rate, humidity and altitude are factors BUT there is a POINT of no return for Diablos in general.
 
shambozzie said:
A nice video on YouTube of Ted's holdover pushing jsb .22 18.1 @ 935 fps with great accuracy from impact with 700 mm bbl. The .20 cal jsb 15.9 heavy get funky @ 920 from my Rapid mk ll. I think each gun/barrel handle them differently.
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oddly teds holdover link from you tube gets deleted when i try to post it here (oh well) anyway, i am aware of the link you are referring to irt pellet speed stability for .177
 
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Try Airgun101.
Screenshot_20221007-142305_Samsung Internet.jpg
 
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FJR1300 said:
I have found it greatly depends on the air rifle used. My AGT Uragan 2 will shoot JSB's 18's at 980 fps extremely accurately all the way out to 100 yards. My Daystate and FX doesn't even come close to being able to do that at those speeds.

View attachment 295466
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what is the diff in your barrel length and twist rates?
 
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shambozzie said:
Try Airgun101.View attachment 295459
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So an interesting take away for me or my AHA is that "as the weight of the pellet increases, it can tolerate more speed" all other factors being the same. That said the lighter the pellet, the more likely you will need to reduce power to maintain levels of accuracy. This also suggests to me why slugs and higher calibers seem to thrive on higher power outputs when all other factors are the same. Thoughts?
 
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cavedweller said:
So an interesting take away for me or my AHA is that "as the weight of the pellet increases, it can tolerate more speed" all other factors being the same. That said the lighter the pellet, the more likely you will need to reduce power to maintain levels of accuracy. This also suggests to me why slugs and higher calibers seem to thrive on higher power outputs when all other factors are the same. Thoughts?
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Slugs thrive on higher power because they are spin stabilized and diabolo pellets are drag stabilized. If a slug is shot to slow or with to slow of a twist rate they wont stabilize.
 
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cavedweller said:
rifled barrels on airguns have been a thing long before slugs became a "thing" with much higher powered air rifles
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Doesnt really matter if it became a thing. Diabolo pellets stabilize in a smooth bore from drag. Slugs wont stabilize in a smooth bore and require the correct rpm to stabilize. The combination of twist rate and speed giving the correct rpm is needed to get accuracy from slugs. Slugs will always be more accurate at the higher speed than a pellet due to the design and how they stabilize.

As speed is pushed with a diabolo some very small amount of twist might be beneficial for accuracy and I dont know if that is true or not. If a drag stabilized projectile does benefit from a small amount of twist after a certain speed it will be a much slower twist than any slug would require.
 
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LDP said:
Doesnt really matter if it became a thing. Diabolo pellets stabilize in a smooth bore from drag. Slugs wont stabilize in a smooth bore and require the correct rpm to stabilize. The combination of twist rate and speed giving the correct rpm is needed to get accuracy from slugs. Slugs will always be more accurate at the higher speed than a pellet due to the design and how they stabilize.

As speed is pushed with a diabolo some very small amount of twist might be beneficial for accuracy and I dont know if that is true or not. If a drag stabilized projectile does benefit from a small amount of twist after a certain speed it will be a much slower twist than any slug would require.
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I don’t disagree but you have to ask why the pellet gun manufacturer’s rifled barrels before slugs were in use?
 
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LDP said:
Doesnt really matter if it became a thing. Diabolo pellets stabilize in a smooth bore from drag. Slugs wont stabilize in a smooth bore and require the correct rpm to stabilize. The combination of twist rate and speed giving the correct rpm is needed to get accuracy from slugs. Slugs will always be more accurate at the higher speed than a pellet due to the design and how they stabilize.

As speed is pushed with a diabolo some very small amount of twist might be beneficial for accuracy and I dont know if that is true or not. If a drag stabilized projectile does benefit from a small amount of twist after a certain speed it will be a much slower twist than any slug would require.
Click to expand...
www.physicsforums.com

Precession of an air rifle pellet in flight

Unlike firearm projectiles, air rifle pellets have evolved to a generally typical diabolo configuration. For reference, see: http://www.photosbykev.com/wordpress/2009/01/20/air-rifle-pellet-database/ The initial shape was described as like that of a badminton shuttlecock, and "skirt" at the...
www.physicsforums.com www.physicsforums.com
 
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www.pyramydair.com

The remarkable diabolo pellet | Blog | Pyramyd AIR

by Tom GaylordWriting as B.B. Pelletier When these diabolos are spinning, they will balance on a taut string that passes under the narrow shaft in their centers. The diabolo is the shape of our pellets, with some exceptions. The name is so universal that in many languages pellets are not even...
www.pyramydair.com
 
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