Remove engine drive hub prior to installing fan?

[Joe Bill]

As my first helicopter I just bought a Raptor 50V2 kit and an OS 50 SX-H
engine. Having never done this before I've got a question about installing
the engine fan. For the OS engine do I remove the drive hub from the shaft
before screwing on the fan?

It doesn't look like there's a drive hub on the Thunder Tiger engine in the
building diagrams, so I suspect that I should remove it from the OS engine,
but wanted to make sure before I moved on.

Thanks.

Jim

[Ian]

> As my first helicopter I just bought a Raptor 50V2 kit and an OS 50 SX-H
> engine. Having never done this before I've got a question about
installing
> the engine fan. For the OS engine do I remove the drive hub from the
shaft
> before screwing on the fan?

Yes, you need to remove the thick aluminium prop driver.

>
> It doesn't look like there's a drive hub on the Thunder Tiger engine in
the
> building diagrams, so I suspect that I should remove it from the OS
engine,

And you were right. There is a thin black washer supplied that you can use
to get the clutch clearance. It worked perfectly on mine.

> but wanted to make sure before I moved on.

You were right to do so but you would have found out that the engine/clutch
would probably not fit with the prop driver still there. :-)