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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Predator Aluminum Tail Gear Box Upgrade
01-23-2010 01:24 AM  8 years agoPost 1
2tall

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Crystal Lake, Illinois, USA

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Just received my aluminum tail gear box upgrade for the Predator. (http://www.heli-world.com/detail.aspx?ID=5432). I notice that both of the bevel gears are metal, not nylon or of some other non-metal, self-lubricating material. Since metal gears require an applied lubricant my question is how does Century expect that lubricant to remain effective in an open box configuration? I would think that any grease applied would be spun into orbit once the unit was set in motion. Any thoughts, experiences?

"Pay attention...lest the ground rise up and smite thee."

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01-23-2010 03:12 AM  8 years agoPost 2
Gearhead

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Vt

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as for a thought

not that I have had Metal Tail Gears, but gears like these only need a tiny bit of Lube, and it's most important for new gears or very worn gears, I would think after they are broken-in they would need even less Lube,, so just Lube them a bit and keep an eye on them, if they look dry Lube some more,,

as for Lube I would think everything from Oil to Grease/ Light to Heavy has been used,, I am just wonder how Dielectric Grease would work, it sticks like hell and it's dry so it wont attract dirt and dust as much..

Jim
Buzz Buzz Buzz

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01-23-2010 03:38 AM  8 years agoPost 3
2tall

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Crystal Lake, Illinois, USA

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Century's IB for the same gears in an enclosed gear box instructs the builder to apply a generous amount of synthetic grease. That, in part, is what prompted my concern.

"Pay attention...lest the ground rise up and smite thee."

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01-23-2010 03:48 AM  8 years agoPost 4
Gearhead

rrMaster

Vt

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"synthetic grease"

they tell you synthetic for the plastic I would think..

Jim
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01-23-2010 03:58 AM  8 years agoPost 5
2tall

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Crystal Lake, Illinois, USA

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I agree - they probably didn't want a petroleum based lube interacting with the plastic housing. Your suggestion of keeping a close eye on the gears is probably the best option. I just wonder why they didn't include nylon gears with the upgrade. That would have avoided the lube issue completely. I'm not aware of any other manufacturers open architecture tail gear box that uses metal gears.

"Pay attention...lest the ground rise up and smite thee."

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01-23-2010 04:20 AM  8 years agoPost 6
Gearhead

rrMaster

Vt

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well I think you can use the stock Plastic Gears ??

Jim
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01-23-2010 04:37 AM  8 years agoPost 7
2tall

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Crystal Lake, Illinois, USA

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My stock gears were metal, not plastic. Only the housing was plastic.

"Pay attention...lest the ground rise up and smite thee."

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01-23-2010 04:53 AM  8 years agoPost 8
Gearhead

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Vt

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""My stock gears were metal""

oh,,, I did not know that LOL

Jim
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01-23-2010 05:29 AM  8 years agoPost 9
2tall

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Crystal Lake, Illinois, USA

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Yeah - the stock configuration includes metal bevel gears in an enclosed plastic housing. The IB wants those metal gears generously lubed with a teflon synthetic grease. I think they went synthetic because a petroleum based grease would attack the plastic housing. My concern was/is that the applied grease will not stay in place long without the enclosure housing to keep it contained. Hence, nylon self-lubricating gears would have been better in the open style aluminum gear box. Another drawback to exposed greased gears is that the grease itself attracts and clings to dirt, thus creating an additional maintenance concern.

"Pay attention...lest the ground rise up and smite thee."

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01-23-2010 05:47 PM  8 years agoPost 10
oldfart

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Vancouver, Canada

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May I suggest that you call or e-mail Heli-World and ask them for their recommendations relating to it.

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01-24-2010 03:21 AM  8 years agoPost 11
rotaryfalcon

rrApprentice

S.E. USA

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The bottom line is clean em often, lube em often.

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01-24-2010 04:02 AM  8 years agoPost 12
eeeeky

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Roosevelt UT USA

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hey guys, maybe i can offer an insight here. I have been flying this gearbox for almost two years now. The metal open tail gearbox, and tail gears just need a HEALTHY dose of Litium grease on the gears, yes if spins most of it off, but just the right amount stays, and keep its going for many flights. I would recommend re-greasing every 50 or so flights.

Happy flying. Eeeeky

Lets Fly!

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