New Compact LabRadar at NRA Exhibits.

[Kracken McGraw]

We were just looking at MV only!! MV is very critical to down range ballistics!!! Accuracy is not the issue, Precision was the goal!!!

I think it has been posted before that the reading from the Xero is very close to the Magnetospeed.

 

[Wild Bill IV]

I think it has been posted before that the reading from the Xero is very close to the Magnetospeed.

And my thesis was based off of real true MV instead of back calculated down range Vs can have some small variability!!!

 

[Wild Bill IV]

Lots of chatter of the LRLX operating at 60GHz frequencies!!! Had to check that Freq out and see what limitations were set by the FCC for licencing!!! Turn out, 57-64GHz is line of site, unlicensed millimeters wave range with limited range of 2-3 kilometer!!! Yeah, I have to start saving for one of these puppies!!!! Put it in tandem with the old LR and double the data and have MV, ranged Vs verification!!.!

 

[Rocketvapor]

Way back, I was happy with an optical chrony.
Then happy with a Magneto Speed.
But, the wife and I are shooting prone together and moving the Garmin closer to the one shooting is just so much easier.

 

[hoz53]

Different density than air!!! The straight head-on collision impact would create a sudden drag, slowing the bullet's V a little!! 1) Drag changed the bullet velocity!!

Not only did the different momentums in the head on collision slow the bullet, it also caused more friction in the rotational surface cause a change in the rotational inertia!! That little sudden change caused torque which opposed that fictional force!! That torque would tip the bullet's rotational axis!!
2)The frictional force of the water on the bullets surface would tip the bullets CL axis!!

That rain drop is falling straight down for this scenario!! That droplet has inertia (momentum) and is at 29 f/s (terminal velocity) downward (Vector pointing down)!! That droplet vector will shove the bullet down!!! Think sectional density!!!
3) Collision downward would push the bullet flight path downward!!!

The total effect of the bullet/raindrop collision would be the vector sums of 1)-3)!!!!

In reality, not knowing bullet RPM before the collision, V at the time of collision, mass of the bullet, SD (Sectional Density), droplet mass or volume, I'm going to make an educated guess!!! It would be like a Semi hitting a dear!!!! If that collision occurred within the 1st hundred yards, it would, not could, open impact at long range!!!

I'm going to tackle this problem with brut force physics and math just to get a rough idea of what is happening and it will be close, but not exact!!! We have the perfect rain droplet falling straight down and having a VECTOR at 180°, or 3), and a bullet traveling perfectly horizontal having a VECTOR at 90°, ie 1)!! Using a 2 body collision model (Conservation of Momentum), the trig results are around 0.075 MOA bullet deflection with a 150gr bullet traveling 2500f/s and medium or average droplet size of 3.5mm diameter at 29f/s (Term V)!!! Now the big droplet of 7mm diameter (hail soon to follow if more heat is sucked into the cell) would deflect that bullet 0.75 MOA!! Hit 10 of those bad boys and it could deflect more than 7.5 MOA!! Why are we out shooting in this shit??? In snow, mist, light rain with small droplets, just chance the humidity and temperature settings in your ballistic calculators!!

Keep in mind, you have to establish where the collusion occurred and know the remaining distance of flight to the target in order to calculate how much deflection will occur on the target!! Adjustments in velocity lost at collision must be used to finish the remaining distance to the target!!! Medium droplet at the muzzle and target range of 100yd would deflect 0.075"!! If collusion occurred at 50yd, deflect would be 0.035". 75yd, 0.018"!! 1 foot from target, assume 0 deflection!!! Just multiple by 10 for 1000yd!!! These figures are within 10% scientific error (probability, not statistical)!!!

BILL
AIM SMALL, HIT BIG!!!!

thanks for that info Bill. i did read through it and i think i understood most of it. i am no engineer or scientist though. i have been out shooting in the rain plenty of times and it doesnt seem the rain affected where my shots hit. ive only shot in the rain at relatively short ranges though. prob not over 200. i always thought there would be some affect if a bullet actually hit a rain drop but i wonder what the chances are. like you say i know it depends how hard it is raining. i bet the military has done studies on this and has info.
ill read through your reply some more times to see if i can get more understanding out of it. Thanks again —-KH

 

[Dave M.]

We were just looking at MV only!! MV is very critical to down range ballistics!!! Accuracy is not the issue, Precision was the goal!!!

To each their own Bill. You do you.