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Jim Hahn's latest activity
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
ERROR. I made a mistake in my formula. I wrote that BC = 1/4 times ... The 1/4 should not be there. The coefficient is ONE...
Apr 24, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
last chunk
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Two more chunks. Scanner acting up...
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Second chunk
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Split into several sets of pages. To allow me to post as attachments. Several 'chunks'. Should learn how to use Dropbox...
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Ran into attachment size limit. Very small. Send me an email and I'll forward to you. "hahn" underscore "02493" atSign "yahoo.com"
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Did not scan it yet. Wasn't sure anybody was interested. Will scan and post, probably today.
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Derivation's available. 10 pages, hand written, scanned.
Apr 8, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
Several places on the Internet reference the following equation for calculating BC: $$G1 = 0.0052834 *...
Apr 7, 2024
J
Jim Hahn
updated their
status
.
Info: Retired. Long range rifle shooter. 35 years writing software for computer operated equipment, mostly in 'c'. Live in Arizona.
Mar 25, 2024
J
Jim Hahn
posted the thread
Found PhysicForums while working on ballistics problem
in
New Member Introductions
.
Several different sites, including PhysicsForums, mention/discuss a formula for computing a bullet's Ballistic Coefficient based on...
Mar 25, 2024
J
Jim Hahn
replied to the thread
Calculating ballistics coefficient from two velocities
.
I have been working on the derivation of this formula for several weeks. I can get the form of "L/difference of square roots of...
Mar 25, 2024
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