Specifications

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Designed to retain the same
mounting dimensions of the
91FX but with increased
power and torque. Optimised
to produce strong torque and
power at modest RPMs and exploit the
extremely effective E-4040 silencer. The
highly effective and unique cooling fins
keep temperatures under control
and the carburettor provides
the precise control you would
expect from O.S.
L-OS19120 O.S. MAX 95AX w/4040 Silencer ................ £239.99
Displacement: 15.55cc (0.949cu.in.)
Bore: 27.7mm (1.091in.)
Stroke: 25.8mm (1.016in.)
Power Output: 2.9PS@15000 rpm
Practical RPM: 2000~16000 rpm
Weight: 567g (20oz)
Dimensions (mm):
A 52.0
B 25.0
C 94.5
D 61.0
E 103.3
F: 66.6
G: 42.6
H: 54.1
J: 81.3
S UNF 5/16-24
L-OS34820 O.S. FSa-81-P ........................... £349.99
Displacement: 13.26cc (0.809cu.in.)
Bore: 27.7mm (1.091in.)
Stroke: 22.0mm (0.866in.)
Power Output: 1.28PS@10000 rpm
Practical RPM: 2200~10000 rpm
Weight: 570g (20.11oz)
Dimensions
(mm):
A 50.0
B 21.0
C 112.0
D 57.0
E 117.5
F: 66.0
G: 40.0
H: 55.5
J: 97.0
S UNF 5/16-24
L-OS35420 O.S. FSa-110-P ............................................. £369.99
Displacement: 18.0cc (1.10cu.in.)
Bore: 30.4mm (1.20in.)
Stroke: 24.8mm (0.98in.)
Power Output: 1.8PS@10000 rpm
Practical RPM: 2000~11000 rpm
Weight: 610g (21.52oz)
Dimensions (mm):
A 52.0
B 25.0
C 120.2
D 61.0
E 125.6
F: 66.5
G: 42.6
H: 54.0
J: 104.0
S: UNF 5/16-24
Sport and scale modellers have
enthusiastically embraced FS-a engines
because they virtually eliminate oil mess
while delivering excellent power. Now
you can get the 81FS-a equipped with a
fuel pump for even more
consistent performance. It
mounts easily in the same
space as an FS-70 II with no
modifications. Ideal for compact
aerobatic models and other
situations that demand consistent
high power!
The FSa-110-P is a great engine to
increase power when you want to
replace a .91, as it has the same
mounting dimensions. Now you can
enjoy the added benefit of a fuel
pump with this new version of the
FS-a110. Plenty of torque to swing
large props, making it ideal
for aerobatics and other
situations that demand
high power at all
attitudes.
Compared to the old ‘Hyper’ the new
91HZ-PS offers improved hovering stability
as well as power at high speed to meet
the most demanding 3D manoeuvres.
A new design piston and crankshaft
reduces vibration to a minimum
and the rectangular heatsink
head offers improved cooling.
A large PD-08 pump and latest
61B-PII carb assures a consistent
fuel supply irrespective of violent
changes in model attitude.
Displacement: 14.95cc (0.912cu.in.)
Bore: 27.7mm (1.09in.)
Stroke: 24.8mm (0.976in.)
Power Output: 3.5PS@18000 rpm
Practical RPM: 2000~16000 rpm
Weight: 635g (22.40 oz)
Dimensions (mm):
A 44.0
B 17.5
C 76.6
D 52.0
E 90.9
F: 51.6
G: 36.0
H: 42.85
J: 72.6
S UNF 1/4-28
L-OS18621 O.S. MAX 91HZ-PS Ring (61BII Carb) .........£319.99