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HomeAircraftHelicopterAntiques or Out of Business › Calling on "gorhambirds" et al. Re: GMP tail rotors.
04-21-2018 05:45 PM  4 months agoPost 1
douflytoo

rrNovice

Valparaiso, IN. USA

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Hi everyone, Currently restoring/rebuilding my fathers GMP Hughes 300 and need to replace tail blade holders. I have a new set of Hirobo Shuttle blade holders and am wondering if I am on the right track to fit the holders onto the GMP hub. I know "gorhambirds" has a mod for this from previous posts but no one ever says what the actual mod. is. I'm thinking...

A. Use a small brass spacer on the hub and fit a 4x9x4 standard thrust bearing (it turns out that a rotor head spacer from a Blade SR fits perfectly, 3.1mm i.d./4.0mm o.d.) or
B. Use a 3x9x4 radial bearing available from Boca, but not sure if a radial bearing can handle the thrust load.

Also, anyone have main blades?
Thanks guys,
Dave

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05-01-2018 08:33 PM  4 months agoPost 2
gorhambirds

rrApprentice

Hickory Hills Illinois, usa

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I used to use a heavy radial bearing but you have to use the lightweight Cricket tail blades or it can fail. Now, as you already explained, I use a piece of tubing as a spacer to allow a current Hirobo thrust bearing from the shuttle to fit the hub. This is only required of your machine is fitted with the older style hubs with the brass cup bearings. The later models featured a heavier hub with the Hirobo thrust bearings. On those, the Shuttle tail blade grips are a direct fit. I do have main blades. Send me a PM.
Gorhambirds - Steve Z

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