MasterMech said:
Let's start with the problem. Why do you want to aerate/till?
This is the all-important first question.
Personally, I think that unless there is significant mechanical compaction from something heavy being driven on the lawn or severe people traffic (like a regularly-used walking path) that there is no need for mechanical aeration on home lawns.
Ridgerunner said:
The most effective method for soil aeration is through "heave" action. For 50-100 sq feet, (or more if you're industrious) I suggest you purchase and use a spade fork ...
+1. This is by far the best way that I have used personally. I've done this after heavy vehicles (dump truck delivering soil or rock, a septic tank truck, etc.) have driven across the lawn in just the tire tracks. I've also used a manual core aerator in those cases, but I think the spading fork is better.
Just to provide a little more background, I used to regularly do core aeration. However, my past experiences combined with reading of experiences here has led me to be a no-aeration guy except for cases of significant mechanical compaction (e.g. the dump truck mentioned above.)
Core aeration is likely to provide lots of places for weed seeds to germinate that you'll be better off without. It also can spread some troublesome weedy grasses like
poa trivialis.
My personal approach now is to test the soil, provide what the soil test says is needed, and add lots of biosolid fertilizer (Milorganite or Bay State, etc.) for nitrogen and general good health. Earthworms will explode in your lawn and provide all the aeration you could possibly need without inspiring lots of new weeds.