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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Radikal Tail Hub- How to keep it tight?
08-12-2010 12:19 PM  7 years agoPost 1
jaymanjibe

rrNovice

Woodbridge, CT USA

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I am a new Radikal owner. I am working on burning through my second gallon of fuel.

I have had 2 crashes with the Radikal due to the tail hub coming loose. One crash was minor, One crash was Major. In the major crash the complete tail hub came off mid flight and flew off into the bushes. I never found the parts and had to order all replacements.

I have now re-built the complete tail, loctited the set screw into the dimple on the tail shaft. Let it sit overnight and did a test flight in my backyard last night. After about an 8 minute hover the heli flew smoothly after the re-build, but in a post flight inspection the tail hub was loose again. It was wobbling on the shaft/dimple.

Has anyone else experienced this? It has loosened on me 3 tiimes in about 25 flights. This can't be right.

Any suggestions?

Thanks,

jaymanjibe

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08-12-2010 12:33 PM  7 years agoPost 2
helibreezer

rrApprentice

Patuxent River, MD - USA

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First, try red locktite. Clean all old locktite out of the threads and set screw, apply red locktite, and let sit. If you still have a problem, your hub has a second hole drilled and tapped in it. Make sure you don't have the old pitch plate, as it causes some unwanted vibes. Also ensure that you have the hub on correctly, with the flat side towards the boom. If all of this is correct, just lightly tighten the set screw, on the other hole, mark the shaft, take off hub, and dremel the marked spot flat, with a cone shaped grinding stone, and shape it into a slight bowl shape. Then re-install the set screw, and put another one in the other hole. Just make sure you screw them in as evenly as possible to keep everything happy.

what does a dominatrix have in common with a heli? Both beat something into submission!

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08-12-2010 01:16 PM  7 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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Read this thread
https://rc.runryder.com/t559832p1/?highlight=epoxy

And put some epoxy on it as suggested and it will stay put.

Reason being the hub is thinner diameter (shaved for tailrotor pitch clearance) and there isn't enough meat there as usual and is easier to work loose. Also use lighter tail blades which will work less on trying to loosen it.

That would be my recommendation, and also there are some other ideas from other pilots for you.

Good luck and enjoy!

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3288 flts
Whiplash V1-2 Hanson 300, 1570 flts
Whiplash V2 Hanson 300, 402 flts

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08-12-2010 02:54 PM  7 years agoPost 4
woody37

rrApprentice

McAllen, Texas

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Helibreezer is right! First use Red Locktite... Clean the shaft and inner hub with acetone and fit the tail hub on the shaft. Align the hole with the dimple and apply locktite in the hole with the threads. Also apply locktite on the set screw. Use only 1 set screw. When you tighten, it will push the locktite throughout the hub. Let it dry overnight. When you need to take the hub off the shaft, heat it up with a solder Iron or small torch and the set screw will come right out.

If it still comes loose, I suspect that your tail shaft bad.

Woody

A bad day of flying or fishin is better than a good day at work!

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08-12-2010 05:25 PM  7 years agoPost 5
jaymanjibe

rrNovice

Woodbridge, CT USA

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Thanks Guys, I will try these fixes out.

Raja, thanks for the link to the old thread. My RR search did'nt find what I was looking for...

As for the Tail hub PN HW3098A which is the number in the Radikal Manual which I purchased two of, it seem there is no milled flat on one side to allow increased pitch travel. Do you have to mill your own flat? Maybe Century has made a running change to this part, but it still came loose on me. The shaft and hole clearances seem pretty sloppy to me.

Red Loctite/epoxy to the rescue.

Thanks Again...

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08-12-2010 07:02 PM  7 years agoPost 6
woody37

rrApprentice

McAllen, Texas

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If there is play when you install the hub on the shaft then there is a problem. There should be no play or rocking back and forth. It should only spin freely on the shaft without the set screw.

If there is play or rocking, you need to replace the shaft or hub. Again, the hub should fit on the shaft like glove.

Woody

A bad day of flying or fishin is better than a good day at work!

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08-12-2010 09:40 PM  7 years agoPost 7
jaymanjibe

rrNovice

Woodbridge, CT USA

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Yes the part fits are sloppy (tail hub and shaft) and both parts are brand new.

Like I said, I lost the entire tail assembly so I had to replace the whole thing with new parts.

I guess Century's tolerances are not as tight as I would like to see.

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08-13-2010 05:12 AM  7 years agoPost 8
rbort

rrProfessor

Franklin, MA - USA

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In this case
Just fill the gap with epoxy and you'll be all set. Make sure its lined up properly before the epoxy dries.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3288 flts
Whiplash V1-2 Hanson 300, 1570 flts
Whiplash V2 Hanson 300, 402 flts

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