Brothers build a stern wheel steamboat


| July/August 1959


This 19-foot-by-7-foot-wide stern wheel steam boat was made by John Malary and two of his brothers. Brother Peter did the welding. The hull is made of 18 gauge galvanized and all seams are double row riveted. It does not leak a drop. The paddle wheels had been used before but had to be rebuilt. It is driven by common implement chain.

The boiler is of the porcupine type and has 122 dead end quills. Outer ends are arc welded shut and the quills are arc welded into the 6-inch central column. They are 3/4 inch by 7 inches long seamless. The boiler stands 500 psi cold water test. There are seven flat coils of 3/8-inch pipe connected in series and are placed above the quill section. The feed water is preheated by being pumped through these coils. Steam is taken from the end of the central column and passes through a super heater coil of 1/2-inch iron pipe that surrounds the quill section.

Experience has proven that the circulation in these porcupine quills is so violent that no mud or lime ever collects in them.

The engine has a bore and stroke of 3 inches by 4 inches. Single slide valve and it is reversible. It can be started three minutes after L. P. gas main burner is started. The L.P. pilot burns continuously. Steam atomized fuel oil can be burned after the engine is started. There is an automatically regulated engine driven feed water pump. A large super heater is very necessary on water tube boilers. IMA 






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