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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Severe wag on Predator
03-12-2010 03:19 PM  8 years agoPost 21
flyinfriend

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North American continent

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Thanks again guys for the replies. I tried pulling on the nut while turning the hub. I even chucked the hub in my drill and pulled on the nut with needle nose pliers locked on with vise grips and spun up the drill, still no luck in getting it off. I'm thinking TNT might be the only solution left. I hate to ruin my grip.

I might order the TRex tail as Rotaryfalcon suggests. I have an extra tail for my Audacity Pantera, I might see if that is a fit.

On the Century hub should I be able to snug the locknut until it stops or is it really necessary to leave it a little loose as the manual suggests?

Thanks guys,

Tom

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03-12-2010 03:27 PM  8 years agoPost 22
Billme

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MS

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Like I said, I have 5 year old tail assembly.. Mine bottoms out..I think it should, just don't strain the nut.... They may be adding this to keep you from over tighten the nut.. Let me go see the on line manual, if it has been updated...

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03-12-2010 03:34 PM  8 years agoPost 23
rotaryfalcon

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S.E. USA

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The Pantera tail will fit and is a good tail(I have a Pantera). You will probably need the Pantera slider fork assb also. I would be willing to guess it will fit the Century slider sleeve. The Pantera control arms on the grips are off center, where as the Trex are centered to the hubs centerline, the Rappy slider fork and links fit perfectly to the Rex grips. If you go this route PM me and I will send you pics.

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03-12-2010 03:43 PM  8 years agoPost 24
Billme

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Tom,

I'm assuming they are doing this now to keep you from over tightening the nut... /tighten till it binds, then back off slightly..

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03-12-2010 09:42 PM  8 years agoPost 25
flyinfriend

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North American continent

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Hi,

Just an update on the issue. Paul from Century emailed me today and he built out a hub with grips today. The one he built is free and uses the same washers. He is sending it out priority mail and I'll disassemble and add grease. The support on this heli from Paul has been incredible. I can't say enough, he has helped in every way he could. When I had a brand new pinion/clutch bell that was rocking back and forth as it turned (not flown but on the bench) I sent it back with the bearing block. Paul checked it and found out the pinion was bent. He rebuilt it with a new pinion and sent it back to me with a set of new carbon tail blades (nice surprise). Each time Paul has sent a missing or bad part he has sent it Priority mail so I usually got it second day. Thanks again Paul for your support.

I measured the washers I have and the dimensions seem correct however the id of the washer measured within a hundredth of a mm smaller or exactly the same as the shoulder of the tail hub axle. That distance difference may be outside of my tolerance for error in measuring, but I measured several times and I think the tolerances were just too close to be a good fit. I don't have a rat tail small enough to get in the id of the washer, and I still can't get the lock nut off.

I await a Priority mail package.

Thank you,

Tom

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03-13-2010 12:47 AM  8 years agoPost 26
oldfart

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Vancouver, Canada

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I was pretty sure that Paul would come in and keep you smiling.

Phil

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03-13-2010 11:57 AM  8 years agoPost 27
ron6460

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MASS THE GET F$*KED PAY! PAY! STATE

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wag the dogs tail
Tail wag is a dogs thing !!

" It was not me ! The sun was in my eyes Super Fly "

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03-17-2010 02:52 AM  8 years agoPost 28
flyinfriend

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North American continent

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I received the new tail hub and grips from Paul at Century yesterday. I disassembled them and greased the bearings. When I reassembled everything fit perfectly and the nuts snugged up nicely against the axles and did not bind on the bearing before snugging as my previous set did. Also the bearings dropped right in on these grips whereas on the other grips the thrust bearings were tough to get seated completely. I had assembled and reassembled my previous grips and hub and could not get it smooth.

Anyway I test flew it this afternoon and the WAG IS GONE!

I couldn't believe it. The tail was locked right in and I flew her around slowly without the canopy. She flew great!! I guess in the original hub the hub/grips were binding even more under load and the servo would try to move it and it would bind and then move and then do it all over again in the other direction.

Thanks again to Paul at Century for all of his support. I now have a great flying heli. Now to break in the g231 and really get this dialed in.

For others with a Preddy which links do you adjust to dial in tracking, do you use the short one or the long one going to the main grip?

Thanks for all of your replies guys I appreciate the help,

Tom

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03-17-2010 02:59 AM  8 years agoPost 29
Billme

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MS

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Glad you got it fixed... Use the long rod from the swashplate

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03-17-2010 03:02 AM  8 years agoPost 30
jschenck

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La Vista, NE.

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Try to make sure both sets of links are the exact same length before starting off. If I need to make tracking adjustments I use the longer links. But if it needs more than a turn or two double check everything to see if there is an issue somewhere else. Also I do this on the bench. Set both blades to have 0º pitch at center stick in all 4 positions around the heli. When I do this the tracking is right on at the field.

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03-17-2010 04:32 PM  8 years agoPost 31
oldfart

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Vancouver, Canada

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Be sure you have assembled the tail blade grips with the bearings and spacers in the proper sequence. If you have forgotten to put the small M5x7x0.5 spacer that fits between the thrust bearing plate and the radial bearing or have installed it in the wrong sequence, this will cause binding when the tail rotor is at speed. You would not be able to feel this binding on the bench - ditto if one of the thrust bearing plates is assembled in the wrong sequence.
Glad it is now working as it should. Seems my initial diagnosis was correct.

Phil

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03-17-2010 05:13 PM  8 years agoPost 32
ron6460

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MASS THE GET F$*KED PAY! PAY! STATE

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Flying
Hi Tom lets fly that
clam this weekend !!! Ron

" It was not me ! The sun was in my eyes Super Fly "

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03-17-2010 10:20 PM  8 years agoPost 33
flyinfriend

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North American continent

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Hi oldfart,

Just wanted to note that the hub and grips I had originally built out were assembled correctly and in the right order with the shim. I had re-done it several times to triple check it. It seemed to be a problem with the grips. The t-bearings were difficult to seat properly and the nut never snugged up against the hub axle before binding on the radial bearing. When I got the new set I disassembled it and greased the bearings and re-assembled it without any problems, and the nut snugged up just before binding the bearing.

You were right about the binding being the issue though. If the new hub hadn't been the resolution I was about to tie a rope to it and use it as a boat anchor.

I flew it again today and it was flying ever so smoothly and looked pretty sharp with the canopy on. I have an interesting story on todays flight but will post that this evening.

Thanks again for all the help guys,

Tom

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03-19-2010 01:20 AM  8 years agoPost 34
Helizrule

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Lake Ariel, PA

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I have just been flying my second Predator gasser and today was the second day out with the new one. I have the Futaba 520 gyro and S9254 servo. I have a constant tail wag. My other Predator gasser has the Logictec combo with no problems. Is there something I should know about the 520 and gassers. I am remounting the gyro tonight with Zeal tape and relocation it at the same time. I'll give it a try in the morning. Any additional info on the 520 would help.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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03-19-2010 02:09 AM  8 years agoPost 35
oldfart

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Vancouver, Canada

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Did you mount it using one layer of the double sided tape that comes with it, then have the metal plates supplied sandwiched between that tape and another square of the tape which is attached to the heli?

In order:

gyro
tape
metal plate
tape
heli

If memory serves me correctly, it seems the instructions were very clear on mounting it this way in any higher vibration type of installation. (e.g. nitro and gasser.)

Also be sure you set it to the proper setting relative to your servo.

Phil

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03-19-2010 02:26 AM  8 years agoPost 36
flyinfriend

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North American continent

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Hi helizrule,

I have not used that gyro. The only one I am familiar with is the gy401 which is what I have used on all my nitros and is what I am using on my Predator gasser.

Just curious, when you tightened the nuts on the tail grips did they snug up against the hub axle and stop before binding against the radial bearings or did they seem to tighten on the radial bearing before snugging up against the axle?

The wag I had was consistent,and was not coinciding with the engine four stroking. When I increased the gyro gain on the radio the width of the wag decreased but was always there. I tried mounting with one layer of tape and two and there was no difference. I have never tried the two layers with a metal plate in between. My gy401 holds perfectly, I am not a 3d flyer but just looping and rolling and flying around.

Tom

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03-19-2010 03:41 AM  8 years agoPost 37
Helizrule

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Lake Ariel, PA

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I had mounted the 520 as per the instructions for larger machines. That bring, Gyro, Tape, metal plate, tape, heli.

Flyingfriemd: I am guessing the hub is the real problem as you described exactly how the with of the wag increased and decreased with gain. Yes, the hub binds a bit. I loosened it up and I'll try it tomorrow morning. My other predator I changed over to a Raptor 90 tail slider and hub and never looked back. I think this one will go back to Century so they can figure it out. Thanks for all the input.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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03-19-2010 01:51 PM  8 years agoPost 38
flyinfriend

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North American continent

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helizrule,

My hub was only binding very slightly when I first installed it and it wouldn't bind all the way around. There was a half turn with each grip that felt free. I think under load the bind became significant and the servo had trouble driving the hub. I hope you are able to resolve this soon.

Good luck,

Tom

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03-19-2010 04:15 PM  8 years agoPost 39
4 stroke flyer

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Dowagiac,MI

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I have a 520 W. BLS251 on a Bergen Gasser. I have had a lot of problems with tail wag. I went as far as converting the machine to a glow 91 and that seemed to corect the problem. The issue being vibration. I have since converted back to a gasser with a Wally motor in this time. I am still in the break in period so the tuning is not perfect yet. The wag is better but still have some issues. Hopefully it will go away once the motor is tuned in.

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03-20-2010 05:02 AM  8 years agoPost 40
Helizrule

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Lake Ariel, PA

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The problem was the tail hub. I tried the Raptor 90 hub from my Predator gasser and the tail wag wet right away. The tail holds like a rock with the 520 gyro and s9254 servo. I had the exact same symptoms and FLYINFRIEND. The hub was the same in that there was 1/2 turn free and the rest would bind. I found this on three Predator gassers so far. At least the problem has been tracked down and no due to the gyro.

Flyinfriend, thanks so much for your input. I solved the problem first thing in the morning after reading your post.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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