Some years ago I spent some time communicating with Mark Cheney of Utah Marsh Motors about building a small, light long tail mud motor for super light and small marsh boats. Specifically home built Hybrids, MoMarsh DPs, or Four Rivers. At that time buying a Beavertail frame kit and then drilling it to fit a small 2hp Honda GX motor was your only option.
Mark understood what I was asking for, but he didn't seem to want to get serious about the "small" concept. The weed whacker homemade long tails were going crazy all over the intertubes. Even home made long tails with small 2 to 3HP motors were being built. However there was no normal manufactures out there showing that they were taking the weed whacker long tail serious. Crawdad, and Rickshaw were giving it a go, but not really capturing an audience (at least it appeared this way to me at the time).
After a few years I gave up on UTMM and went with at Stumpjumper from Bills Engineering. At 65 pounds it is as light as a produced motor comes, and at a decent price. Its too heavy to use on my smallest boat, but pushes the big boat well. Still need to build a boat in between to get the most out of the motor.
After looking at skybust's Four Rivers for sale, I spent a few minutes browsing around the Four Rivers website and noticed some videos. Videos of Four River boats with long tails. Specifically a 2hp long tail from Orion outboards called the Helios. they make a small surface drive mud motor similar to the Copperhead.
Its what I have been asking for for over four years. Too bad I don't need one anymore.
Videos are on the Four Rivers website.
The rest of the videos are on the right side. Pretty cool that a 2HP motor pushes the boat through a beaten down cattail swamp.
They even show a video of one of the bigger boats with a larger Swamp Rat motor showing how it can be kind of hinky if you are not careful where you run the motor.
The bad news....these motors do not appear on the Orion website.
The good news....you can buy one from Four Rivers.