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MECHANICAL'

pistons. The pistons in most rotary engines of this type are
controlled by gears and crankshafts, usually resulting in
higher costs because of the frequent breakage of the gear
teeth and problems encountered in balancing and manufac­
turing of the crankshafts. The “Ryenco” rotary engine,
because of the elimination of these parts, simply doesn’t
have any of those problems.
The “Ryenco” rotary engine was designed by Ronald
Ryen of the Rotary Engine Co., Cedar Falls, IA. This
four-stroke gasoline engine is completely portable and has
only 15 moving parts, 13 of which are submerged in oil. The J)
engine is inherently balanced since it doesn’t contain any
crankshafts or valves and is able to put out a uniform torque
at speeds of 60 to 4000 rpm.
Although this engine has only one cylinder, it has the
performance characteristics of an 8-cylinder conventional \________________________i______ y
POSITION A
engine that has twice the displacement. This is accomplished
by completing four power cycles every revolution, instead of
one every second revolution.

In its first prototype form,
“Ryenco” rotary engine
weighs only 8 lb
(3.6 kg) and can deliver
up to 15 hp with
its 6-1/2 cu in
(0.1 liter) displacement.
It also provides about 40
hp-hr/gal of fuel,
thus making it
low in pollution emissions.

Two pairs of wedge-shaped pistons chase each other
around inside cylindrical casing. When combustion takes
place in chamber 3, (position A), one pair of piston vanes,
(Pi) or (yellow), is driven in clockwise direction while
other is almost stopped. This causes the fuel-charged
mixture in chamber 2 to become compressed, while
Working chambers in “Ryenco" engine are provided by pistons air-fuel mixture is sucked into chamber 1. Combustion in
that change their relative position with each other, moving close chamber 3, controlled by linkages, moves piston vanes
together—then farther apart, as whole assembly rotates around around to new position B where previously-fired chamber
output shaft. This is accomplished by action of linked control 4 is allowed to exhaust. Combustion then continues to
arms reacting to eccentric free-floating bearing. Angular move piston vanes to another new position C where ports
displacement shown above by linkage for single piston. are closed and another chamber adjacent to plug is ready
Linkages for other piston is same so that entire engine is totally to fire.
balanced and doesn’t require balance wheel.

Design News—OEM 4-9-73/49