User Manual

SAITO FG-11
4-Stroke Gasoline Single Engine Operating instructions
FG-11 is one of the smallest gas-engine among 4-stroke gas-engines which is designed based on the long seller- Glow
engine FA-62. Taking same devices such as carb, spark plug, ignition system from exsiting single-gas engines such like
FG-21 FG-17 FG-14C, durability, stability, and reliability are given as well.
󰱲27.0mm
Body: 465g / Muffler: 50g / Ignition system: 100g / Engine mount: 110g Approx.
19.0mm 10.9cc
Approx.2,000-9,500rpm
12x813x8
Approx.8,5008,800rpm
APC 13x7 Approx.1.31.7kgf (Depend on prop）
-1-
Thanks for buying SAITO FG-11 4-stroke gas-engine
exclusively for model airplanes.
In order to avoid misuse, please be sure to read well this
instruction manual carefully. If there should be any deficiency,
inconvenience, etc. concerning the manufacture, our company
will repair them with responsibility.
Any failure or trouble caused by unnecessary disassembly,
modification, or other uses than those provided in the instruc-
tion manual is not subject to the warranty, however.
Moreover, all responsibilities for the use of the engine, and
other obligations and responsibilities based on laws, regula-
tions, etc. are borne by the purchaser and the user, and SAITO
SEISAKUSHO CO., LTD. is exempt from any responsibilities.
Notification about treatment of 4-stroke model gas-engine
◎Since valve timing is designed to get high power and high speed, the overlap range is relatively wide. So sometimes fuel get flown
back from the carburetor. (It may spatter in the engine room.）
◎Since the oil for lubrication is mixed in the fuel, waste oil from the breather nipple is dirty. Depending on treatment of waste oil, it
can be spattered on the plane.（Ref. Section 9）
◎
Since lubrication is through breather, sometimes the oil oozes from each joint or commissure however its no problem on performance.
◎Depending on the quality of the oil, sometimes there can be rust inside the crankcase. But its no problem on performance as long
as there are no abnormal noise or backlash.
Specifications
Bore
Stroke Disp.
Weight
Practical speed
Max on Gnd
Propeller Static thrust
Applications
Fuel
Fuel consumption
Battery for ignition system
Standard accessories
4-stroke glow 50-60 class
Regular gasoline：Oil＝20:1 (Volume ratio)
Approx. 7cc/min (At full throttle 8,800rpm)
*Fuel flow varies depends upon prop load. More fuel flow with larger load and less fuel flow with smaller load.
Voltage:6-8.4V higher than 1,000mA is recommended
Engine mount set 1set
Ignition system（w/ sensor） 1set
Spark plug [SAITO SP-1] （Attached to engine） 1pc
Muffler set 1set
Limit gauge (0.1t) for tappet adjustment 1pc
Spanner for tappet adjusting lock nut 1pc
Hexagonal wrench set 1set
Plug wrench 1pc
1. Propeller
Depending on the airframe, please adopt the standard size in the
data and use a reliable product which is generally on the market.
(APC13ｘ7 is recommended)
Please maintain sufficient balance. Since an imbalanced prop is
vibratory and dangerous with
lowered performance, please maintain balance with a balancer.
Moreover, a cracked prop is dangerous. Make sure to check any
time and replace it with a new one if its cracked.
*Prop and fuel consumption
If the load is large (the diameter & pitch of the prop is large) for the engine
characteristics, the air-fuel mixture should be rich. Thus the main needle has to be
opened. That is, even if the revolution is low, the fuel consumption is high.
Conversely, when the load is small and the revolution is high, the fuel consumption
is lowered because the main needle can be closed.
In order to decrease the fuel consumption and prolong the engine life, a propeller
should be used whose revolution is maximized when the throttle-valve is fully
opened, while using an airframe which enables all flights with about 90% of the
output of the propeller. In this case, the throttle valve will be further throttled
during horizontal flight. On the contrary, an airframe which can only deliver
performance in fully open condition will suffer worsening fuel consumption and life.
Outside dimensions
Fig.1