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HelicopterCentury Radikal G20-30 N640 Hawk Predator › New Hawk sport/ Century rep. help please
12-21-2003 08:24 PM  13 years agoPost 1
bones

rrNovice

Western Arkansas

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I built this thing and have taken my time getting things right. Yesterday I started it for the final radio and pitch adjustments. The wire drive screws backed out and I shut it down JB welded the wire in and threadlocked the screws. Well, then the tail gave way again. I put the bird up for the night and took the tail gearbox off to fix it later. I just looked and the wire, which was tight and in place, but the gears in the box are shredded. Are there stronger TR gears, or have I setup something wrong to cause them to shear/melt. There were not just teeth missing, the teeth were totally smoothed off of both gears. I did have the TR servo reversed and fixed that with some other small pitch/headspeed adjustments for hover.

I'm gonna call support tomorrow for replacement gears, but don't want the same results again.


Please help....

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12-21-2003 10:16 PM  13 years agoPost 2
Gearhead

rrMaster

Vt

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sorry, there are no stronger gears, check you tail blades, for you must have had a tail blade strike the ground, we all do it at 1 time or another,,, Century's tail gears seam to hold-up pretty good if you don't have a tail blade strike,,, some guys have said that they needed to file a flat on the end of their wire drive (for the set screws), my Hawk had the flat on the wire from the factory...


Jim

Jim
Buzz Buzz Buzz

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12-21-2003 10:39 PM  13 years agoPost 3
SteveH

rrProfessor

Texas

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Bones,

Jim is right on with his comments. Century has no stronger gears and the plastic gears in the Hawk hold up very well if there is no tail rotor blade strike. I have a Falcon SE that is about four years old with the original gears in it.

The tail rotor drive wire is notorious for coming loose if there is not a flat ground onto the wire, or if the wire is not straight going into the input shaft. What seems to help is to use two set screws in the input shaft, and after the length is set and they tightened, pull the gear box apart, pull the shaft and wire out of the boom just a short way and rotate the shaft. At that time if there is any wobble in the joint of the wire and the input shaft, adjust the two screws until the wire and shaft joint runs true with no wobble while it is rotated. If this joint is left wobbling, I can almost guarantee you it will eventually come apart and will probably also cause the tail boom to vibrate.

Hope this helps.

The government cannot give you anything without first taking it from someone else.

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12-21-2003 11:19 PM  13 years agoPost 4
bones

rrNovice

Western Arkansas

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The wire had the flat spot, I had fixed it, however

The white plastic gears are stripped out? No tail strike, I havent even had the joker off the ground yet.

I thought about it for a while, and the motor was running forward then after about 10 seconds flipped and was running backwards, would this cause my gears to strip? The TR worked after this episode though.

I will mail the gears to you Steve, so you can inspect them. They aren't doing me any good.

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12-21-2003 11:27 PM  13 years agoPost 5
Gearhead

rrMaster

Vt

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bones,,, you said,,, " the motor was running forward then after about 10 seconds flipped and was running backwards, would this cause my gears to strip?"

if the tail blades were at a good speed, then reversed,,, I would think yes...

Jim

Jim
Buzz Buzz Buzz

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12-21-2003 11:31 PM  13 years agoPost 6
bones

rrNovice

Western Arkansas

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Wasp, this is the only thing I can think of

I checked the century site and the gears are only $3.95, so I guess I'll get them and a head button

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12-21-2003 11:40 PM  13 years agoPost 7
Ellis Lim Quee

rrNovice

Apopka Fl. USA.

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When you get your gears order the torque tube upgrade for the boom...Much better response on the tail......

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12-22-2003 12:41 AM  13 years agoPost 8
kpfister

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Dalton, GA

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I had to deepen the factory notch in the drive wire a little bit, no problems with the gears, tho. Only when I land tail first!

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12-22-2003 02:10 AM  13 years agoPost 9
Gearhead

rrMaster

Vt

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torque tube,,, I have to agree, if you have the money order the torque tube kit with the gears, you then wont have any problems there !!


Jim

Jim
Buzz Buzz Buzz

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12-22-2003 03:36 AM  13 years agoPost 10
paramedic58

rrNovice

Gulfport, Mississippi

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Hawk sport

Hey Bones welcome to the wonderful world of R/C Helis, before you order a head button for your hawk, look at the top of the rotor head. If you see that there is a hole there without threads don't get the head button, because it won't fit. The head button is for the Hawk SE, and the Ravens. I bought a head button for my hawk too but found out that it won't work on the head for a hawk sport because the hole is too big with no threads. So I gave it to a buddy of mine that is a Century rep that needed it for is Raven that gravity seemed to like it more than he did. And how is the mountains or hills of western Arkansas doing? Iam from the Jonesboro area.

Troy

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12-22-2003 08:01 AM  13 years agoPost 11
Gearhead

rrMaster

Vt

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I think this is the part number you need, it's in the Century link,,, but ask about it when you make your order...

http://www.heli-world.com/Merchant2...ct_Code=CN2215P

Jim

Jim
Buzz Buzz Buzz

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12-22-2003 08:49 AM  13 years agoPost 12
poiuyt

rrApprentice

Idaho

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That's the correct one Wasp.

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12-22-2003 09:19 AM  13 years agoPost 13
dnts

rrVeteran

Israel

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Maybe you had the tail gears mixed up? if you had the pinion and output gear reversed, they don't mesh nicely and a short run would strip them for good. This might also cause the tail drive wire to come loose (extensive vibrations).
The other option you mentioned - the engine backing up on you might also cause that - it is sometimes enough to just bend one teeth and the gears would self destruct in seconds.
I have two hawks that suffered from intimate encounters with mother earth. I cracked the tail blades (carbons) but the gears stayed intact (this says something about their strength).
Anyway, for $3.95, you can't go wrong. If you don't have a spare crash kit, you might want to get one of those as well. It's a life saver if you crash in the morning and still wish to fly in the afternoon (crash kit rebuild is about 30-45 minutes).
Nir

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12-22-2003 02:01 PM  13 years agoPost 14
bones

rrNovice

Western Arkansas

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Troy..thank you...

The mountains are great, this morning it is about 65F outside, no breeze, perfect for flying. But, there is a hinderence called work, and then no tail gears. Thank you for the info on the head button.

DNTS....

The TR came pre-assembled could be a posibility, but cant prove it now. Whats $3.95 added to $700.00 anyways? I'm selling a kidney next week to buy a crash kit and spare parts after the hover phase.....HAHAHA

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12-22-2003 02:52 PM  13 years agoPost 15
dnts

rrVeteran

Israel

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Actually, I read somewhere here on the Century forum that some T/R gears were assembled the wrong way. Since I had to open the T/R box anyway, I checked that out and added more grease, just in case.. You might have had a lemon..

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12-22-2003 06:13 PM  13 years agoPost 16
kherriage

rrNovice

Durant, Oklahoma - USA

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Bones

If the ground is soft and uneven, you can stick a tailfin in the ground without noticing it, thus the tail rotor blade strike the ground. I speak from experience.

Keith Raven 50, TT50 AKA 'Ole Grumpy' Raven 50, OS50 AKA 'Jr'

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12-23-2003 02:02 PM  13 years agoPost 17
bones

rrNovice

Western Arkansas

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Durant, not far form here

Thanks for everyones help here, you guys are great. I placed it on a peice of plywood to give it a slick place to spin incase there was a problem with servo or gyro backwards. With the board the tail jumped to the left and did not crash, just spun.

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › New Hawk sport/ Century rep. help please
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