I used to install sprinklers years ago. We used an Ingersoll 185 CFM compressor to blow out the lines in the fall. You need volume and lots of it.
For your compressor, you have 7.5 (7.48) gallons per cubic foot.
When the first sprinkler is purged the air will want to take the path of least resistance versus pushing the water out of the rest of the heads.
It truly depends on how many heads per zone how much CFM you would need. Worst case if you cant push the water out of all of them you could hold your finger over the ones already purged to force the air to the other ones. This is where kids would come in handy. On a smaller compressor, you will start losing PSI quick. More gallons of air would help, even on a small compressor, adding another tank and letting it charge up would help.
Most of the bigger Rainbird residential heads max out around 8 gpm. Depending on how your system was designed, most people would have setup the heads around 4 gpm or so. This allows for a little adjustment either way. They run 30-40psi.
My info is 20 years ago since I worked on sprinklers.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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