You posted a link to picture of a swiftsure towing a dinghy about the third of it's length so you can look and see what it looks like. I tow a 9'9" inflatable behind a 26' MacGregor and I am sure it looks like an inflatable the military would use, it is rather large (17" tubes) and has a little 5hp engine on the transom. I have to run my 50HP on the back of my Macgregor about an extra 500 rpm to compensate for the drag and maintain the same speed I like without towing (about 8 knots). It is a real joy to have a little dinghy to scoot around in and explore with when I get to any destination but I confess that I absolutely hate towing the stupid thing around with me, too much drag and always have to keep a watch on it. I only tow it when on extended trips of several days otherwise I'll go without just because it slows me down. One time I was crossing the San Juan Channel under sail and it seemd like the other few sailboats were passing me like I as sitting still because the dinghy really slowed us down under sail. You will lose about 2 knots depending on the weight while towing. They are a pain to tow but a joy to have.