Forgive me if this is a dumb question but I am trying to learn something before purchasing a Case 4420 sprayer with AIM. Some have multiple nozzle bodies but some 4420s just have a single nozzle body...I am looking to spray likely 4 gal for burn off and 10 gal for Liberty and 10 gal for Tilt etc in crop. Is there a decent single nozzle that will do all of that or should I only look at sprayers with multiple nozzles? I suppose another option with the single nozzle body is to switch nozzles with each product but that seems painful.
Just to give you a rough outline of the bodies you are looking at. They are likely made by Wilger. They are actually expandable to just add a 5-way turret onto them.
Given what you are looking for application (4 GAL Burnoff/10 Gal for Liberty/Tilt), you are likely going to be shooting yourself in the foot a little bit if you were trying to do both with one tip.
For coverage/efficacy of the chem, most use a fairly different size of droplet size. A lot of it has to do with drift as well as how much of the leaf/head/weeds that need to be touched.
4 GAL BURNOFF
In short, you'd be looking for a 4 Gal nozzle that will reduce your drift to a point where you are comfortable with, but also so you aren't going to be losing your coverage by reducing drift.
If you are new to AIM, one of the easiest things to use is the P1/P2 preset sets. These will change how you spray a fair bit, as you'd be picking your pressure based on whether you are in a more drift sensitive area or in the middle of the field and want the best coverage possible (or ideal conditions).
I.e. For your headlands or other drift sensitive areas, you would have your P1 set to a lower pressure, so your drift is reduced (but so is your coverage). With AIM, you wouldn't necessarily have to slow down to reduce the drift, so a little more productivity there.
For your non-drift sensitive areas, or if conditions are ideal, you might be using P2 at a higher pressure, which would essentially increase your coverage (by getting more, smaller droplets).
If you wanted a glimpse into what this might look like, there is an app called Tip Wizard (free on Android/Iphone) that you plug your application rate/speed/spacing/etc into the app in the PWM application (PWM = AIM Command)
It would show you your speed range(s) for your application with each tip that would work, it would show the respective duty cycle at your speed, the % driftable fines, the VMD (just think average droplet size), as well as your % of small/useful droplets (Anything over 600microns is usually too big to do much good).
Tons of confusing things in the last two paragraphs, but the app has little notes that explain each of them a little bit too. (Or ask me if you have any questions)
For Burnoff, depending what you use, a typically application of Roundup/Glyphosate would target a droplet size of 350microns in IDEAL conditions, but since most guys don't get ideal conditions, I usually tell them to scale it up depending on what kind of winds/applications/drift sensitivity you have to deal with. (i.e. usually guys trying to hit the 400 micron-ish range are very happy with coverage and drift reduction)
10 GAL (Liberty)
Since liberty applies a lot differently than glyphosate, both in spray quality (very 'soapy in the wind') as well as function (contact herb versus systemic herb), it demands a different kind of application to be get the best efficacy.
Use what I said above, as well as the label 'ideal' VMD of 250 (which is pretty darn fine and drifty) with added droplet size to accomodate for the nasty conditions and spray quality. Most guys I talk to settle around the 325 VMD for their Liberty. The guys who might be more drift sensitive for Liberty might even go a little bigger for drift reduction, but they might be adding a little bit of water volume to make up for the coverage.
Tons to read, I know, but AIM has a lot that it that it can do, but you need to understand a little bit more of how to spray like a pro. (Haha, that sounds cheesy, but its pretty true)
If you did need a hand or wanted more info if you were looking into it seriously, send me a PM or I can even give you a call.
(Just for transparency, I do a lot of the sprayer clinics for Wilger across Canada and help guys work through picking tips and all that jazz)