Sand Piper
A 30' 2" Tunnel-Stern Scow Day Cruiser
By William Atkin
A Shoal Water Day Cruiser
There are so many places in these United States of ours where the water is spread thin and broad that some satisfactory kind of boat is badly needed for the navigation thereof. The typical tunnel stern motor boat fills this want to some degree; but somehow does not suit every demand. The tunnel is a difficult thing to build, and as the propeller is usually housed entirely within this its efficiency is impaired, and consequently the speed of the boat is disappointing. Stern wheel propulsion is efficient, but the wheel is cumbersome, and the mechanism which turns it more or less complicated. Therefore the propeller is the better form, for propulsion of boats of this character. From time to time we have been asked for designs of shallow draft craft of one kind or another, and after trying most of the underwater forms generally used for this kind of service have hit upon and tried the model of Sand Piper, the plans of which are herewith shown. It will be noticed that the entire bottom of the boat forms the tunnel. This form of hull is as easy to build as a regular V bottom and has all the advantages of the latter type with the added advantage of extreme shallow draft.
Boats that are used on rivers, shallow bays, and lakes have a very different service to perform than the kind to which we are accustomed on salt water. Seaworthiness is not paramount as shallow water is not usually rough. A craft for this service should be able to slide over mud and sand bars, push her nose up on the bank almost anywhere, lay alongside jetties, floats, docks, etc., without fear of grounding or of damage. These items have been borne in mind in the design of Sand Piper and we are convinced that whoever builds her will have a most excellent kind of craft.
The lines show a boat of the punt or scow type having a length over all of 30 feet 2 inches. The water line is 24 feet 6 inches, the breadth 7 feet 4 inches and the draft with fuel and party aboard 1 foot 8 inches (the draft is to under side of shoe). The sections are perfectly straight, which is the way sections on a V bottom boat should always be. Nothing is gained by moulding the sides or bottom excepting in craft designed for extremely high speeds. The slight dead-rise ends at section 6 at which point the bottom is perfectly flat. Abaft this the bottom is an inverted V with its greatest depth at the stern. The deepest point on the chine is at the stern and it extends in a perfectly straight line to section 6 which is the center of the water line length. The keel of course carries out aft and has enough drag to protect the propeller and support the lower end of the rudder.
From the standpoint of speed this river boat should more than satisfy. Several different motors are in mind that will do nicely for her power plant. One of these (the one shown on the plans) is the Packard Jr., a six cylinder high speed outfit. With this the speed should be well over 17 miles an hour. This is fast for a craft of this kind and size. The F4 Scripps would be suitable power, or the new Erd small four cylinder; in fact there is a wide choice of power. I know though that the motor should be light, powerful and turn fast. Remember, though, the fast turning motor requires but a small diameter propeller, and the propeller determines to a large degree the draft of the boat. It is for this reason that I recommend a fast turning motor.
Plans for Sand Piper are $85
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