At first some customers started using the smaller diameters of our heavy duty 5 foot long fenders on the sides of their canoes and hard tenders to aid in stablity and make them soft sided against larger hulls.  Then we started making them custom lengths out of our fabric used for standard fenders allowing colors and a seam for attachment.

For stability on their Heritage line of sailing/rowing craft, we make Little River Marine inflatable sponsons which incorporate a luff tape similar to sails. The luff tape runs in a groove along the underside of the gunwale making them easy to install with nice continuous contact. Length is as long as 16 feet with a 4.5" diameter.

We've also made smaller diameter inflatable tubes for bimini supports as long as 12'.  Since the coverings are reinforced material they can withstand higher pressures becoming quite rigid depending on diameter and length. The tubes can be incorporated into the bimini and are easily deflated for storage compared to metal tubing.

If your interested in sponsons or tubes, we can quote on diameter and lengths and have some flexibility in color. Tubes are usually provided with a flap of material along their length to use for attachment. Flaps can be screwed through or grommets installed at intervals as lashing points. The luff tape is another option replacing the flap. Aluminum and plastic grooves are available to accept the tape. If necessary mulitple flaps are also possible.