The AirGun Guild

General Category => Airgun Ammo => Topic started by: steveoh on May 23, 2020, 10:21:20 AM

Title: What causes pellets to spiral?
Post by: steveoh on May 23, 2020, 10:21:20 AM
What causes pellets to spiral? This is another really informative video By Matt Dubber.

Not a valid youtube URL
Title: Re: What causes pellets to spiral?
Post by: Alan on May 23, 2020, 10:45:58 AM
This works:
Title: Re: What causes pellets to spiral?
Post by: steveoh on May 23, 2020, 11:31:11 AM
Doh!
Title: Re: What causes pellets to spiral?
Post by: Chickenthief on May 23, 2020, 01:55:37 PM
This video actually shows instability:
Title: Re: What causes pellets to spiral?
Post by: Alan on May 23, 2020, 02:29:40 PM
Ditto Doh!
Title: Re: What causes pellets to spiral?
Post by: rsterne on May 23, 2020, 07:34:38 PM
The root cause of spiralling is dynamic instability.... This often occurs at longer ranges because the forward velocity decays faster than the RPM.... This can trip a pellet over the line between being dynamically stable and unstable.... There are two common solutions to spiralling.... Reduce the velocity or reduce the twist rate.... Both reduce the RPM....

Bob