Disable Aerodynamic Jump in Kestrel 5700 Sportsman

[Mordamer]

I have been using Strelok Pro and Strelok for quite awhile. I have become incredibly confident in them and how I have them set up. I have shot in multiple different crosswinds out to 1,300 yards and I have not been off on elevation by more than .1 mils even though I always have vertical crosswind deflection turned off.

I recently got a Kestrel 5700 and I decided that I would trust it if I could get it to line up with my Strelok data at every distance. I have it lining up with my Strelok Pro data perfectly all the way to my max expected shooting distance of about 1,300 yards. The exception is when I input a crosswind. If I input a 10 MPH wind from 3 O'Clock the Kestrel shows .2 mils less elevation required than with no wind. This is wrong compared to data I have gathered in the field. I have fired at the same targets from the same position with winds from right or left of more than 10 MPH and both times my elevation was the same for center hits.

How can I disable the vertical changes from crosswind in the Kestrel?

 

[Kobyashi72]

Use Wind 2. Wind 1 calculates the AJ. AJ would occur in the first 30 yards

if the wind is obstructed from your flight path in the 1st 30 yards then you shouldn’t see an AJ shift down range

 

[Mordamer]

Use Wind 2. Wind 1 calculates the AJ. AJ would occur in the first 30 yards

if the wind is obstructed from your flight path in the 1st 30 yards then you shouldn’t see an AJ shift down range

I just tried this and you are correct. If I leave wind 1 zero then it will give me wind correction for wind 2 with no AJ. But what if I capture wind? Will I always have to go back into wind and set wind 1 to zero after wind capture? This seems like not the best work around because wind 1 is very useful as the low windspeed measured.

 

[Kobyashi72]

If you want an Elevation Hold that doesn’t change with your wind 1 input then yes.

You can find out how much AJ would affect your elevation hold by setting your range on the kestrel to 100 yards (your zero) and increase the wind 1 (either from 9:00 or 3:00) input until you see you Elevation hold move .1 mils (e.g. my 308 takes 8 mph to impact me .1 mil) and either add it or subtract it back to you Elevation but that would be your call.

What are you shooting?

.2 mils is high for a 10 mph crosswind to be affecting your elevation that much?

 

[Mordamer]

I'm shooting a 6.5x47 Lapua with 130 grain bullets at 2,900 FPS. If I upgrade to the elite version will it give me any more flexibility in turning options on and off?

 

[DocUSMCRetired]

I'm shooting a 6.5x47 Lapua with 130 grain bullets at 2,900 FPS. If I upgrade to the elite version will it give me any more flexibility in turning options on and off?

No. It will just give you more features. It will Increase the number of rifles you can store to 30, allow the use of CDMs, add the Ballistics Screen, Add the Range Card, Add Multi-Target, allows DSF Calibration (Ballistics Calibration in subsonic zone), and more.

 

[Kobyashi72]

I'm shooting a 6.5x47 Lapua with 130 grain bullets at 2,900 FPS. If I upgrade to the elite version will it give me any more flexibility in turning options on and off?

Upgrading would just give you more features.

My 6.5 running 130 gr at 2900 gives me .1 shift every 8 mph so it would take a 16 mph wind to push me to .2 mils high.

Are you using the DOF capture in addition to the wind capture?

 

[Mordamer]

Upgrading would just give you more features.

My 6.5 running 130 gr at 2900 gives me .1 shift every 8 mph so it would take a 16 mph wind to push me to .2 mils high.

Are you using the DOF capture in addition to the wind capture?

Yes. I plan to take it out to the ranch and shoot using the DOF capture at several different directions and see how it does.

 

[Kobyashi72]

Were you entering a DOF in the example where your elevation was .2 mils higher?

The reason I ask is because at 1300 yd you’d see .1 mil high if you were facing E 90* and another .1 high for a 10 mph wind from 3:00 for a total of .2 mil

 

[Mordamer]

Were you entering a DOF in the example where your elevation was .2 mils higher?

The reason I ask is because at 1300 yd you’d see .1 mil high if you were facing E 90* and another .1 high for a 10 mph wind from 3:00 for a total of .2 mil

Yes. I believe so. I plan to test both the Coriolis and AJ when I get a chance. I have never turned them on in Strelok and never had a problem.

 

[Kobyashi72]

You wouldn’t see the problem in StrelokPro because Coriolis wasn’t turned on so it wouldn’t present you a solution with Coriolis accounted for if it was present when you recorded your dope. Your dope would match StrelokPro because you would’ve dialed the .1 mils into your 1300 yd zero when you recorded your drop data

Essentially the “shooter” and the “software” think they are only accounting for the effects of gravity but the environment has introduced .1 mils That the “shooter” and “software” are not aware of at the time