Ep. 024 - Doppler Radar & A Brief History of Ballistics
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- เผยแพร่เมื่อ 1 ต.ค. 2024
- On this episode, Seth is joined by Jayden Quinlan and Jacob Morrow from our ballistic engineering department. The topic is Doppler radar technology and to get there, we must go back in time about 500 years when the study of ballistics initially started. From there, we discuss the major milestones up until World War II, when radar came into play for velocity and time tracking. We finish with talking about how the Doppler Radar works and how it’s used. This podcast is a bit technical but packed full of useful information. We hope you enjoy this episode.
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I used to teach physics for the apprenticeship program at Bath Iron Works shipyard in Bath, Maine. Being a gun guy, I couldn't resist doing a calculation for my class to demonstrate the ballistic pendulum. I suspended a piece of firewood from two lengths of masons twine and let it hang over the garage floor. Under the wood was a piece of paper, taped down and a very small dixie cup at the edge of the paper, which was in turn, touching the block of wood. I shot it with a 22, which was fired over a chronograph. 1/2mv^2=mgh is the basic formula, but of course it takes a bit of reverse engineering to get there, but by measuring how far the dixie cup was shoved, and knowing the weight of the piece of wood and the length of the mason twine you can get the velocity. I filmed the entire process because I couldn't bring a gun to work, but we did the math in class. We were within 17 fps of the chronograph reading! Even I was surprised.
The Galileo experiment was to demonstrate that gravity is a constant that acts on all objects the same. It ignored the different BC's of the two spheres dropped. The important result was that the two objects fell at essentially the same speed. In fact, the story is often (incorrectly) told that both objects hit the ground at exactly the same time. The experiment was to disprove Aristotle's theory of gravity that the rate of falling was proportional only to weight, regardless of density.
The effect of the differences in aerodynamic drag was a minor factor and considered within the margin of error. This was because the density of both objects was high and the distance dropped was relatively small (less than 200'). It would have taken a much larger drop for the effect of drag to become more apparent.
4DOF App is unreal as long as you enter data correct, had a guy with me 2day who hadnt shot a scoped rifle at extended range ever and my 3rd trip using it. We were both hitting at 1000yds in wind. HUGE FAN
Awesome topic guys. Can't wait for the other ballistics podcasts to come!
Got 2 Love Hornady !!!
How do the many radio waves not bump into each other and screw up the reading?
This was a great program. I am all for 4DOF!
I really like being able to use you 4dof app and 4dof kestrel. I had to buy some Berger 153.5gr ammo for my creedmoor when availability was tough. Any chance of you guys adding that to 4dof?
Appreciate the comment! We will certainly get that requested.
@@hornady awesome! Thank you!
Great video, guys. Just wait until I tell my wife I need $100K to pursue my hobby! 🤣🤣
Good luck!
How about deploying 2 radar units, one at the muzzle, the other say 1000yds down range to pick up the second half of the trajectory with higher SNR?
Ya… might be hard to convince the boss to drop another $100k 😬
Just so informative and helpful
First rate gentlemen.
I have looked into Doppler radar previously however, I had no idea of the fidelity of the system.
I've been using the Hornady 4DOF app for a while now & am very pleased with it. Pity you don't have all your projectiles listed in the bullet choices for the app.
Been getting excellent results with the 110 grn V-max which I use for culling critters at night under spotlight & occasionally have to take them out to 350- 400 meters. Because I never admit to failure, I've been blaming the misses on the app & not being able to input that projectile into the calculation with the appropriate drag coefficient.
Any chance of adding the 110 V-max into the list lads?
Excellent video and information. I am trying to catch up on watching Hornady videos. The personal background stories are also great stories. Thanks for taking the time on these very interesting videos.
Amazing educational podcast 👏
Thank you 😁
Great topic.
Interesting
Used 4DOF for the first time about a tear ago. Works great!!!
A question arising from comments made in this podcast. Is there likely more barrel wear in a 257 Weatherby shooting say an 87grain bullet at circa 3750 vs say a 120grain at 3250? A small deer sized target weighing about 75lbs on the hoof hence heavy bullet weight not necessary or essential but obviously the effects of gravity will be less and wind too albeit the bc may be much lower hence won’t buck the wind so good. No rapid firing very rarely a second shot required and range no further than 375yds .
High velocity absolutely will produce more barrel wear, more heat and friction
I’d want to shoot heavy as I could for deer anyway
Would testing at night eliminate a lot of the noise and solar flare ?
Nice job fellas.
Good stuff.
Thank you.