Well, here in Wisconsin, we have a season for sturgeon spearing. I'm not much of a fisherman, or spearerman in this case, but I do go out to enjoy a couple cocktails on the ice while some friends set up. The objective is to cut a hole, maybe 3X5 feet, through the ice (generally under 3 feet thick), so your "shack" can be placed over the top and allow countess hours of mind numbing boredom staring at a decoy, hoping a sturgeon will swim up to take a look at it. Through the years I've seen several homebuilt ice saws, some like the one pictured. The only advantages I've seen, versus a conventional saw, are the ability to stay back from the water spray a bit and the fact that many of the good people here of frugal descent seem determined to build better mousetraps around an extra small engine they have laying around. The ice cutters that are the most productive are those with a pair of rubber boots, rain pants, and a hand-held big saw. The hand-held saws can also taper the sides of the hole slightly so the block can be submerged and pushed under the ice easier. I guess if you were cutting blocks, as suggested previously, a sled saw would be the ticket, but in my opinion, bring a real chainsaw with at least 42" of stinger, and you'll do well.