O.S. MAX-91HZ WITH 61E CARBURETTOR
Displacement: 0.912 cu in (14.95 cc)
Bore: 1.091 in (27.7 mm)
Stroke: 0.976 in (24.8 mm)
Weight: 21.8 oz (618 g)
Practical RPM Range: 2,000-16,000
Output: 3.4 hp @ 15,000 rpm
Includes: 61B carburetor, muffler, in-flight needle valve adjustment arm & #8 glow plug
Five holes in the top of the lightweight piston route gases to the piston ring from within, resulting in a tighter seal and minimum blow-by. This effectively transfers more combustion energy to the crankshaft and produces more power than ever before.
There's no need to fabricate an arm to make in-flight needle adjustments – the 91HZ already includes one. Just install for an easy way to enjoy more tuning flexibility in-flight!
A heat sink machined into the end of the crankcase increases cooling and improves performance.
Suppliers Comments
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The next champion in F3C competition!
With back-to-back FAI world championships in 2005 and 2007, the 91SZ-H was a winner by anyone's standards. Now there's the 91HZ – a 91SZ-H redesigned with the help and advice of the world's top pilots. It offers the tuning ease and performance consistency of the multi-time world champion and design innovations that promote improved cooling, a tighter compression seal – and tuning ease!
The narrow profile of the heat sink head helps the 91HZ fit completely inside cooling shrouds without cutting or losing cooling power!
Two heat sinks – one on the head, another on the crankcase – allow airflow to carry away heat and maintain performance.
Better overall balance reduces engine noise and promotes smoother, stronger performance.
The new 61B carb takes consistency to the next level. Dependability features start with an insulating ring which prevents crankcase heat from affecting carb settings. A generous use of seals – two on the main needle, one on the rotor – prevents air leaks and power fluctuations.
In-flight control of the needle valve ensures smooth, consistent runs. |
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