SURVEYOR, A SEVTEC VANGUARD ON STEROIDS While Vanguard engine possibilities have grown from the original 16hp to 23hp, Surveyor is designed to take newer engines of 25 to 40 hp. Surveyor can be built to the same 14 foot hull size as Vanguard for more performance, or it can be stretched to 16 feet for added payload for such as packing more material into the backcountry. Gone is all wood in the craft structure, and a composite deck is used, unlike the fabric deck of Vanguard, for a more robust hull.
With a top speed of 33mph with 25 hp and 40 mph with 40hp for an improved ability to punch into bad weather, (a 2 engine version is shown for 40 plus mph speeds over deep water) and fuel use of less than 1 1/2 gallons per hour, this sev can haul up to 850lb payloads, 1000 lb payload if lengthened to 16 feet, over big and small waters and like the Vanguard, has exceptional athletic abilities over rough terrain. A Three view drawing of Surveyor can be seen at this link.