FS-91
II Surpass ...............................................................
$289.00
O.S.
developed the Surpass Series of 4-stroke
engines for discerning fliers who demand
more power. Able to swing larger props
and supply more usable horsepower, Surpass
4-strokes provide the best performance
for your plane, regardless of scale
or flying style.
The
Surpass series is the 2nd series of
4-stroke engines (The 1st series was
the FS series, discontinued and replaced
by the Surpass series around 1986-7).
"Surpass" refers to this series
gaining 30% more power than the previous
FS series. The new Surpass engines (Version
II and III) also have more corrosion
prevention on the inside of the crankcases.
The
FS-91 II also features a new rear-mounted,
updraft 60P Carb, Intake Manifold, and
Coverplate and a helix gear-driven camshaft
supported by ball bearings, ringed piston.
Does Not use choke valve, but instead
an electric starter to start. Grease-packed
twin-sealed corrosion-resistant rear
ball bearing.
INCLUDES:
One Assembled FS-91 II Surpass Engine
w/Carb
One #F Glow Plug
One Exhaust Muffler w/ manifold
One Set of Instructions, Poster, and Decals
Fuel:
5%-15% nitromethane with 18% lubricant.
Synthetic, castor, or a synthetic/castor
blend may be used. NOTE: Certain four-cycle
fuels cannot be used due to low oil content
. However, SOME four-cycle fuels such
as the Wildcat 4-Cycle 15% (CATP9109)
may be used because it has 18% oil content.
When choosing fuels for this engine, the
modeler must be sure to select a fuel
with at least a 18% lubricant content.
Starting and Field Equipment.
A
fuel tank of approximately 300cc capacity
is suggested. This allows up to 12-13
minutes flying time. Some differences
between 2-Stroke and 4-Stroke engines:
4-Strokes are quieter.
4-Strokes get better Fuel Economy
2-Strokes generate More RPM (11,000-13,000
RPM vs. 4-Strokes rev to around 9,500
RPM)
4-Strokes generate much more torque and
will swing a larger prop.
4-Strokes have a more realistic sound,
like a real aircraft engine.
Although it is cost prohibitive, you can
convert this to the pump version OSMG0890
using the following items:
- OSMG2533 45983000 CARB #60N FS-91-P
- OSMG6491 45968000 INT PIPE ASSY FS91-P
- OSMG2230 72508001 PUMP UNIT PD-07
- OSMG4153 45907010 COVER PLATE FS91-P
