3W 3W-55Xi Operation Manual - Page 5

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Operation manual

Engine Installation

The engine should be mounted on a motor box that will in turn mount to the fuselage. A quadrilateral

shape (gradually increasing in size as it goes away from the motor) provides the best circulation

of air. The reason for using a motor box rather than mounting the engine directly to the fuselage

is that the cylinder(s) need enough room around them to provide proper airflow over and away

from them

The motor box should be stiff enough to prevent engine vibration and it should also have a solid

firewall. The firewall of the motor box should be made from 1/4" aircraft plywood for engines up

to 106cc, or 3/8" aircraft plywood for engines in the 150cc class. For builders experienced with

making composite motor boxes; a comparable strength should be attained.

example image

It is absolutely vital to ensure a tension free mounting of the engine. The surface that the engine

is mounted on must be on an even plane (i.e., a flat and level surface) so that there is no strain

on the engine itself. Again, this is a vital and critical requirement to avoid distorting the crank case,

ruining the engine, and voiding your warranty.

3W Modellmotoren GmbH, Hasswiesenstrasse 22, 63322 Rödermark