What is the difference between a brush saw and a clearing saw? I want to cut off a lot of buckthorn 1/2 to 2 inches diameter. When it comes back low it should be easier to spray and kill.
Basically the same thing. A clearing saw is usually a more rugged and powerful unit designed specifically for the purpose, the lighter brush saw can usually do double duty as a trimmer. It really is just terminology.
I recently purchased the Stihl MS 240 for much the same purpose as the OP. Have cleared with it for about 5 hours (continuous cutting time). Cut hundreds of stems. Currently using the Renegade Blade "Hawk" 10" blade. This is Stihl's largest "brush cutter" before graduating to the "clearing saws". It zips right thru trees up to about 2.5", bigger than that it is still capable, but more challenging. In my case, I bought it for chores around the hunting camp, like shooting lanes, atv trails, etc. Cost and weight were also considerations. If I were regularly cutting much above 2" diameter, or using daily and not occasionally, I would go with the bigger clearing saw. Also remember that the shaft of the brush cutter is longer than the shaft on the clearing saw, giving you more reach to reach under a wide bush, and find the stem, without imbedding your body in the bush.
Like mentioned above, clearing saw and brush saw are names used interchangeably to describe 2 different animals. The clearing saw will obviously be more robust, with a larger motor and more sturdy components (driveshaft, bevel gear, etc.). I bought a used husqvarna 245rx saw earlier this summer and it's one of the best investments I've made. The 245rx is probably what you would consider a clearing saw, only a second in size to the husqvarna 265rx at the time of production. I am probably what you would consider a part time casual user, running the saw a few times a month. When I'm cutting with it I find myself cutting trees up to 4-5" in diameter. It is sufficient for what I am doing, but I kick myself all the time for not trying to find a 265rx or 555fx. When it comes to saws, I always prefer to buy the professional or semi-professional models. It pays of financially for the full time user, and the part time casual user is rewarded with a tool that will last a very long time if well taken care of.
I decided to invest in a clearing saw earlier this year. I went all in and bought the Husqvarna 555. It is an awesome machine and do not regret the money I spent. I just needed something to fill the gap between weed eater and chainsaw. It is very efficient taking out smaller 2" or less trees. It will also take out much bigger trees without too much fuss. I just walk into the brush and briars and start swinging and everything starts falling to the ground. It's a niche machine but it has a pretty wide niche.
Brazos,glad to see you posting. :)