Hit-&-Miss 4-Cycle Engine Plans
Boy is a bar stock engine requiring no expensive castings but is
designed to look as though it was made from castings. As seen above, it
is not possible to know it was made from bar stock. It is mostly
aluminum alloy which is much stronger than castings and machines better
as well. As a hit-&-miss type engine it needs no cooling system
and will operate for long periods on a small amount of fuel. Running
time is 12 hours on 2 ounces (59cc) of fuel. Even after all day runs
the engine only gets slightly warm. The engine is not difficult to
build, yet offers some interesting challenges to keep an experienced
builder interested. Farm Boy is designed to use an "O" ring on the
piston instead of normal cast iron piston rings (the builder can use
cast iron rings if desired). This results in near perfect compression
from the first run and because there is very little cylinder friction,
Farm Boy will coast from 20 to as many as 30 revolutions between firing.
The plans set consists of 19 sheets of quality laser printed CAD
drawings and 2 sheets of construction notes.
Cylinder Bore: 1" (25.4mm), Piston
Stroke: 1-3/8" (34.9mm), Flywheel Diameter: 6" (152.4mm), Engine
Length: 10.75" (273mm), Engine Height: 6" (152.4mm), Engine Width: 6.9"
for a "Feller" who has never had any design training, you could put
most of them to shame. You certainly have some God given gift at design
and your V-2 proves it. You are an 'Artist of Metal.'" - Joe Sowders