New Drag Model for Airgun Slugs
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All Springer/NP/PCP Air Gun Discussion General
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"Bob and Lloyds Workshop"
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New Drag Model for Airgun Slugs
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Topic: New Drag Model for Airgun Slugs (Read 2398 times))
ballisticboy
Plinker
Posts: 266
yes
Real Name: Miles
Re: New Drag Model for Airgun Slugs
«
Reply #20 on:
May 28, 2021, 07:42:43 PM »
My Norton did the same and removed the setup file but you can tell it to put it back. I have scanned the instaled programs and there were no threats found. i think Norton objects because there have been so few users who have downloaded this file.
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Maidstone, Kent, UK, England
Don't believe anything you read on the internet, assuming you can believe this of course.
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26958
GTA Forums Person of the Year 2017
Real Name: Bob
Re: New Drag Model for Airgun Slugs
«
Reply #21 on:
May 28, 2021, 09:58:35 PM »
I don't know how to bypass Norton....
Bob
Logged
Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
rkr
GTA Senior Contributor
Posts: 4343
Re: New Drag Model for Airgun Slugs
«
Reply #22 on:
May 29, 2021, 05:16:29 AM »
So if I understood this correctly this model is for flat base slugs that are now produced commercially. Does this model work with rebated boat tail bullets and gas check tails?
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Finland
Huub Viking Mk2 .22 bullpup - grab'n go gun
BSA Scorpion SE .177 - 12 fpe UK model
BSA Scorpion .25 - 100M BR gun at 60 fpe
BSA Scorpion .172 - 100M BR gun/trainer at 60 fpe
Evanix Blizzard .257 - 160 fpe
Exanix Sniper X2 .45 - 270 fpe silhouette gun
Drozd Blackbird HPA - 1200 rpm full auto fun gun / meat grinder
Evanix AR6 carbine/pistol
+ a couple of springers
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26958
GTA Forums Person of the Year 2017
Real Name: Bob
Re: New Drag Model for Airgun Slugs
«
Reply #23 on:
May 29, 2021, 02:36:25 PM »
Yes, for flat based slugs with a Meplat of about 50-60%, as are now produced commercially.... It is not intended for use with a rebated boattail, but should be close with a gas-check IMO.... I think if will probably be close for a RBT than using the G1 model, however.... The big difference is that it predicts a lower drag between Mach 0.8-0.95 (900-1070 fps) than the G1 model.... which is consistent with what we are seeing in testing....
Bob
Logged
Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26958
GTA Forums Person of the Year 2017
Real Name: Bob
Re: New Drag Model for Airgun Slugs
«
Reply #24 on:
May 30, 2021, 01:03:59 PM »
Thanks to Miles I was able to get EasyBC running on Windows 10.... It is an easy to use program, giving 3 different ways to find your BC, POI change, time of flight and MV, or the more traditional two velocities separated by a known distance (which works with LabRadar too).... It has quite a few drag models which are usable for airgunners, including Miles new proposed Slug model (which he calls SLG
o
).... On first blush, it would appear to be better for slugs than using G1, so you might want to give it a try.... and don't be afraid to push your slug velocities into the mid 1000s, if they are still accurate for you at that speed.... Don't forget to put in your temperature, barometric pressure (correct for your altitude, and critical), and relative humidity (less important).... If you are shooting at a couple thousand feet and don't use the correct pressure you will get a BC that is much higher than it actually is....
Bob
Logged
Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
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GTA
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All Springer/NP/PCP Air Gun Discussion General
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"Bob and Lloyds Workshop"
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amb5500c
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New Drag Model for Airgun Slugs