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Two Cylinder Column Type Marine Engine

2 Inch Bore by 2.5 Inch Stroke
Rated 2.5 H.P. Turning-500 RPM on 125 psi
Stephensen Reverse Gear, Hand Wheel Operated
Height 15 Inches
Weight with flywheel 48 lbs.

The design was based on the following requirements

No castings required,
The cylinder block will be one piece and small enough to machine on a 9 inch lathe
Ball bearings and needle bearings will be used on all rotating shafts.
The finished engine must have the appearance and proportions of a true Marine Column Engine.
Machining and design will be straightforward as possible to allow construction by amateur builders
Machining on a 9 inch or larger, lathe-plus some milling.

The crankshaft is of built-up construction such that it may be disassembled to install or replace the lower rod end bearings. The crosshead bearings are Torrington Needle Bearings, and the eccentric bearings are ball bearings of split race construction.

The crosshead guides are of trunk design. The cylinder drains are connected by piping for convenient discharge of condensate during engine warm-up the cylinders are wood lagged. A displacement type lubricator is included in the plans.

The original engine took approximately 350 hours of' design and construction time using a 9 inch Logan Lathe and a Clausing Miller. The engine is an excellent example of using "no castings" and represents design features proven from past experience gained from designing numerous engines. If you have ever toyed with the thought of designing your own engine without castings studying these plans may answer many of your design problems, most parts are made of cold rolled steel.

This has been a very popular engine. There are several in operation in small steamboats. For an example see the launch NORMAN D

Plans Package

5 "D" Size sheets 22 by 34 Inches

Sheet 1 has a full-size cut-away assembly draiwing showing every part- The 4 additional sheets show every detail part full scale and completely dimensioned the prints are high quality and represent many hours of design time

Instruction sheets are included for some details where machining sequence or hints might be helpful,

A picture of the engine is also included

The fulll plan set is just $30.00

See Ordering Information for full details

Engine Number 5
This is an engine suitable for a small steamboat of 16-20 feet.