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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 90 › Do I have a locked hub or an autorotation hub??
08-04-2007 03:14 PM  13 years ago
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Shoego Heli

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San Diego, CA, USA

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Do I have a locked hub or an autorotation hub??
I have 2 Raptor 90s, one a standard and the 2nd the SE. On the standard I can spin the main blades and the lower geat that turns the tail gear will freewheel. On my SE the main gear and the one right below it turn as one.

I have heard about autorotation hubs, is this what I have? How can I distinguish between a hub that is locked up and one that is an autorotation hub?

Actually can someone also how the autorotation hub functions, does it allow the main gear and the one below it to spin independently or not, etc.

If I do have a so called locked hub how is it fixed or do I have to replace it?

This is the last part of my heli build before test flight so I want to make sure the hub is functioning correctly.
Having my heli: Cool, Having a working heli: Awesome, Having a day to fly: PRICELESS!
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08-04-2007 03:25 PM  13 years ago
Ben-T-Spindle

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Central Illinois

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Contact TT (Ace) – they will probably give you a free replacement.... BTS
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08-04-2007 03:36 PM  13 years ago
Shoego Heli

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so are you saying that the hub is locked up?Having my heli: Cool, Having a working heli: Awesome, Having a day to fly: PRICELESS!
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08-04-2007 04:08 PM  13 years ago
tmaxx26power

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South Dakota

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The 90SE has a autorotation hub. I would say yours is locked up. On mine the upper and lower gears can freewheel from each other.
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08-04-2007 04:22 PM  13 years ago
Shoego Heli

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San Diego, CA, USA

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Aside from buying a new one how is this fixed?Having my heli: Cool, Having a working heli: Awesome, Having a day to fly: PRICELESS!
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08-04-2007 04:39 PM  13 years ago
Ben-T-Spindle

rrProfessor

Central Illinois

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You can replace the bearing – any good machine shop can press it out and press a new one in.... BTS
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08-04-2007 05:08 PM  13 years ago
arrio

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Newport News, VA

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At the risk of repeating what was said.....
The upper gear, driven by the clutch, should free spin in one direction and lock to the mainshaft in the other.
The lower gear (tail drive) is locked to the main shaft. This is called a constant tail drive. The constant tail drive provides full time power/control to the tail rotor during autorotations.
If the upper gear does not free spin in one direction then the sprag/one way bearing is defective. I have seen (rarely) where two one way bearings were installed in a hub. One of them inadvertently installed upside down (backwards rotation). It locked up the hub.
"fly it like you hate it"
Alfred (arrio) Riopel "more toys than time"
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08-04-2007 05:16 PM  13 years ago
jakeg1999

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San Diego, CA

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I would double check to make sure you have your bearing installed correctly. If it's upside down it will do this. If you spin your blades clockwise (normal rotation), both gears should not turn as one. They may turn a little since they are new, but if you hold the top gear it should stop. When you turn the blades counterclockwise (against normal rotation) they both should lock and all gears should turn. If you have your bearing in upside down, this will be backwards. If both gears completely lock in either direction even if you try to hold one and spin the other, then you have a bad or "locked up" bearing....hope this makes sense....
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08-04-2007 07:21 PM  13 years ago
Shoego Heli

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San Diego, CA, USA

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The heli was purchased used and I don't know how much use it has, but I was told and could see that it was flown the day before I got it. If it was flown just before I got it then I can't imagine that it was flown with the hub locked or is that possible?

I will try to take it out and check it.
Having my heli: Cool, Having a working heli: Awesome, Having a day to fly: PRICELESS!
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08-05-2007 02:58 AM  13 years ago
Shoego Heli

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San Diego, CA, USA

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Problem Solved...

This afternoon I pulled the head off the heli and the tail drive gear off. The shaft that goes into the hub was locked in as though there was loctite in there. With some gentle persuasion I finally tapped it out using a small mallet and then rubbed a small amount of ATF on the inside to help keep the hub lubed as Jakeg1999 advised me to do-thanks.

Now the hub works fine and does freewheel when I spin the blades counter clockwise and I hope it stays that way. Maybe from the heli not being used for over a month the hub and junk inside locked together.
Having my heli: Cool, Having a working heli: Awesome, Having a day to fly: PRICELESS!
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08-05-2007 02:45 PM  13 years ago
BJames111

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San Diego, California

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common issue with raptors. Mine did it for the first month when it was new, and now it's fine still nearly a year later.
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