O.S. 15LA ABN w/Muffler

Tower Stock# LXPUD9  •  Manufacturer Stock# 11532
O.S. 15LA ABN w/Muffler (large view)
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Notes from our tech department:
This is the O. S. Max .15LA Engine with Muffler.
Meets requirements of beginners and sport flyers.


One-Piece natural finish crankcase
Non-ringed cylinder construction
Two Bronze Crankshaft Bushings (sometimes called oilite bearings)
Schnuerle Porting (Schnuerle scavenging)
Side Exhaust
Nylon Backplate with Remote Needle Valve
#10G carb with remote needle valve assembly


Expansion-Style Muffler #871
.15LA Engine w/Carb
Instructions, Decal Sheet, and Warranty Card
Two 2.6x23mm screws to bolt muffler to engine
1.5 inch length of fuel tubing for remote needle valve
One #A3 glow plug


Glow Fuel with 5-15% Nitromethane and 20% (minimum) lubricant content
Glow starter, plug wrench and field equipment


Construction: Aluminum 1-Piece Crankcase, Piston, Cylinder Head,
Crankshaft, Connecting Rod, and Crankshaft. Nickel-Plated
Brass Cylinder
Displacement: 2.49cc (0.1517 cu. in.)
Bore: 15.2mm (.598")
Stroke: 13.7mm (.539")
Horsepower: .41 PS, 0.40 HP at 17,000 RPM
Weight: 5 oz w/o muffler (6.5 oz w/muffler)
Length: 56.5mm (2.16") distance/backplate to front of drive washer
76.5mm (3.01") distance from backplate to prop adapter
Width: 24.8mm (1.0") width of engine neglecting mounting flanges.
Distance Between Mounting Holes Same Side: 14.4mm (.56")
Distance Between Mounting Holes Opposite Side: 33mm (1.29")
Height: 61mm (2.42")from bottom of mounting tab/top of cylinder head
Crankshaft Thread Size: 5mm
Recommended Props: Break In: 8X4
Trainer and Sport Models: 7X5-6, 8X4-5
Practical RPM Range: 2,500 - 18,000 RPM

High Speed Needle: 1.5 turns out from fully closed
Low Speed Needle: Tip of the needle half way across the small hole
in the FRONT of the carb body.


This engine will work well with any of the following glow plugs: A3,
A5, or A8.

tlw 6/22/07
updt lmm 3/27/09

Easy RC: Engines
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