Why are you guys so defensive?? You seem to take anything said negatively as an attack?? Not sure I understand that. IslandTractor, I have never saw a Flail Mower being used in the States I've driven thru for highway maintenance. Everything I see is Rotary. And I have travelled a lot of Europe and don't use them as a barometer of what I should do here. I used Eagleviews post as an example of a honest, comprehensive description of a Flail with it's limitations. Lastly, I didn't ask you to take me seriously or any other way. I simply commented. Take it any way you like.

whirly, you are correct. I have not read all 2247 posts in this thread. I'm not sure why that matters since they are spread over a 7 year span. I realize no poster in this thread cares whether I own a flail or not. I'm not sure why it's so important to you? I'm also not sure why you turn my comments into a personal attack against me. You know nothing of my friend or his decision to give me a flail beyond the 8 word sentence I posted about it. So you result to calling me names like "buttercup". That's very mature on your part. Lastly, I am suffering no misery. I simply have stated my thoughts about flails in general. As I said to IslandTractor, take them any way you like. :confused3:
Well, I have read all the posts on every page and I can tell you I don't remember 3 pages ago.
1) All flails are not equal (I'll get back to this)
2) As for municipalities it seems to be a tough split in the Oakland, Macomb Lapeer counties. All up and down M53 (21 mile- 32 mile) they've been using New Hollands with 15' bat wings. It appears Sterling Heights in there retention ponds also uses rotary bat wings (I believe subcontracted) As for the City of Sterling Heights they appear to have a new flail set up. Wings on both sides and a flail on the rear (sweet setup).
In Oakland county I've seen New Holland with rotary cutters on side Arms. In Macomb county for the country roads it's been side mount flails.
So essentially a great mix from what I've seen. ( I can always get photos if anyone cares)
As for my person experience. I've only been using flails this year but have since cut multiple types of ground cover, and lots of acres using different flails. Let's just say all flails are not built equal. Although horsepower DOES make a difference, it DOES NOT change how a flail works. I've used a mott/alamo 6' finish mower a 6' Ford 907 and a 8' Ford 918H.
Although these mowers are fantastic, they do NOT replace a rotary cutter. Yes, 80% of the time I will now use a flail instead of a rotary but it's just an added took. Flails leave a much better finish. With different knives they have different capabilities. The mott will cut grass almost as good a a zero turn. This could easily be used as a primary mower for someone's lawn.
The ford with duck foot knives is a bit tougher and will cut some thicker weeds and also cut grass leaving a good finish.
The 918h is a monster. Cuts grass well, tall weeds and even some good brush. This will most likely be the main go to machine. I was still able to break a flail by hitting a rock. This same size rock would of most likey busted a shear pin in the rotary but then in would of moved on. The brush hog definitely takes in thicker brush hands down and is capable of backing into areas. No really the same with a flail.
Great tools that all intertwine but none of them replace the other.