Engines for Sale

Monday, September 12, 2011

OS Max H 40 P

OS Max H 40 P:- This is an early 2 stroke engine produced in Japan in early mid 60's. The 40 P series engines were popular at that time for Goodyear Pylon Racing which was just being introduced at that time.


Type 2 Stroke Nitro Glow Ignition
Displacement Capacity 6.5 cc (0.397 ci.)
Bore 20.6 mm (.811 in.)
Stroke 19.5 mm (.786 in.)
Practical RPM Range 2,500 to 14,000
Weight .275 grams (9.7 oz.)

Design Features:- 
 Aluminium Piston
Steel Cylinder Liner
Bearing supported Crankshaft
Cross Flow Scavenged Porting

Personal Observations:-
This engine was purchased in the mid 1970's for scale RC Goodyear racing. This was a time when engines were being sold without mufflers and there was a school of thought at the time that our engines were not designed to run with the back pressure created by a muffler. Du Bro introduced their solution, a muffler said to produce almost no back pressure, they called it the Muffl-Air. Just to prove I was a responsible aero-modeler I installed a Muffl-Air on my OS H 40 P.
Most model airplane kit manufacturers were selling kits of scale racers this engine was used in a scale racer called La Jolita produced by Williams brothers, this was their first and only attempt at full flying model airplane kit manufacturing. The kit included many molded parts cheek cowls, cockpit, canopy, turtle deck, wing ribs, wheels, spinner and of course one of the Brother's famous pilot figures.    

View a short video clip featuring the OS MAX H 40 P engine:-

1 comment:

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