The reason for suggesting Enstrom has more to do with its unique sytem.
I think it uses a single belt whereas the Robinson use two sets of
something.  I have known an Enstrom mechanic for some time and he claims
the Enstrom belt system is very reliable and durable.  This does not
mean he does not think well of the Robinson system.  Another is the
Hughes/Schweiser belt system.

Paul, do you know What the Robinson system consists of?   Many years ago
the protoype use multiple V belts but I have not seen the production
unit details.

Bob Y


Just from a distance. Multi V belts and a pilot
controlled idler that serves as a clutch.

Paul Lamar

Paul,

The Robinson uses 2 double vee belts tensioned by an electric jacking screw
controlled by a compression spring working a limit switch. During flight the
re-tension light comes on very occasionally, particularly when using high
power. There is no extra idler. The bottom sheave is on the engine. The top
sheave is on the tail-rotor drive shaft which is also the input shaft to the
gearbox. The Shaft centre distance is changed  to tension the belt. Very
simple system.

Colin Smith

That is interesting. Changes the center to center distance.
Does the gear box move up and down or the engine?

If none of the above sounds like a minimum of four ujoints
are required.  You have a picture of this thing?

Paul Lamar ...No rotor no motor.

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