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HelicopterThunder TigerOther › Help diagnose R50 problem please.
01-26-2007 12:27 AM  10 years agoPost 1
jmsilhy

rrApprentice

Austin, Texas

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Hi guys, I need help diagnosing a problem with my R50. First to the setup:
R50 with OS 50 Hyper, stock muffler, 15% nitro powermaster fuel
Rd8000 radio with some Hitec high torque karbonite servos and a standard in the throttle channel
Futaba 401/ Digital servo combo.
TT Carbon blades, stock paddles.

I'm flying some light 3D, just flips, rolls, inverted flying...

So here is the thing, when in a normal hover, it will fly just fine, a little tail kicking here and there but nothing very noticeable. FF is just fine, like on rails. Inverted hover, now here is where it gets a little weird, after a few seconds after the flip, when inverted, it starts shaking and I get scared like hell. So I flip it back up. But now, after a few seconds hovering right side up, it shakes a little bit and tail kicks more... Every flight this happens again, and I can't find anything loose like screws or links... I tried messing around with the gyro settings, but it gets no better.

Only other symptom I can think of is, right after landing and bringing the engine to idle or shutting it off, it makes a strange sound like "clacking" which I assume is the clutch being a little loose on the shaft and pinion. Could this be the reason for the strange behaviour? Maybe clutch failure already?

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01-26-2007 12:41 AM  10 years agoPost 2
uragem

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Indianapolis, IN - USA

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Is the tail belt tight? Is the clutch slipping? Either one could cause that kind of problem.

Indy Jeweler

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01-26-2007 12:43 AM  10 years agoPost 3
Andrew_S

rrVeteran

Gaston, South Carolina

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Is is the tail shakin or the whole bird? For the tail, check the gyro mounting pad, make sure the belt is tight, try backing down on the gain.....

Has it been crashed? Did this just start? Possibly some things to check would be the screws that hold the balls onto the swash, grips, etc....Main blades too loose....A friend of mine had a r30 that would shake violently out of a flip...Sent it back to thunder tiger, turned out the hole in the seesaw where it mounts to the head was off center from the factory....Is the tracking good? Also check for worn dampeners......

Drewskie

www.congareeflyersinc.com

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01-26-2007 01:15 AM  10 years agoPost 4
pH7

rrKey Veteran

Sterling Heights, MI - USA

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The other symptoms, I don't know, but I recognize the click you hear on spool down. The bushing just above the top main bearing wears and allows some up/down play of the main shaft. You can verify if this is true in your case by pulling up/down on the head. If you have this problem and it is minor you can fix it by loosing the set screws, turn the bushing a bit. push it all the way down against the top bearing while pulling up on the head and tighten the set screws. If it is too bad for this simple fix, turn the bushing over so the unused side is down against the bearing.

Now, I doubt the minor amount of shifting of the main shaft causes your other symptoms, but this should be fixed anyway.

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01-26-2007 01:19 AM  10 years agoPost 5
Gary H

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Minnesota USA

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Back down on gyro gain.

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01-26-2007 10:27 PM  10 years agoPost 6
jmsilhy

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Austin, Texas

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Thanks guys! I already checked the belt tension, seems to be fine. The gyro, I backed it down some when I was fiddling with it, so it didn't help. When inverted, the whole thing starts shaking!

I'm going to try the bushing over the top bearing thing, hope that helps a bit...

How can I know if the clutch is slipping?

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01-26-2007 10:46 PM  10 years agoPost 7
Andrew_S

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Gaston, South Carolina

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the eingie would be revving and the blades would slow down if it was slipping....did this problem just start? How many flights on the bird?

Drewskie

www.congareeflyersinc.com

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01-27-2007 01:21 AM  10 years agoPost 8
jmsilhy

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Austin, Texas

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I started to notice a few flight ago. Bird isn't new, probably around 5-6 gallons through it. I have crashed and repaired it a few times, mostly due to dumb thumbs.

And since I'm just starting with inverted flight and longer hovers, maybe that's why it's showing up now...

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01-27-2007 02:02 AM  10 years agoPost 9
REDNOSERAPTOR

rrVeteran

NEW YORK

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Check the engine tuning and bearrings, how's the idle? do you have to keep it on the high side to keep it on? is it having hard starts? when you land the machine after this problem have you checked engine temp?

Saul

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01-27-2007 05:39 AM  10 years agoPost 10
Andrew_S

rrVeteran

Gaston, South Carolina

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It's probably some of the screws are bent that hold the balls on. Back them out and check.........

Drewskie

www.congareeflyersinc.com

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01-27-2007 06:47 AM  10 years agoPost 11
HUTCH964

rrKey Veteran

Taylor,Texas 76574 local airport T74

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check the fuel tubing & clunk and needle settings once more?

set the needles back too factory settings and go from there.

Worth a shot..

*****

Tim

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01-27-2007 09:17 AM  10 years agoPost 12
Nick Jones

rrKey Veteran

anderson

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seems like the headspeed is to low on your low side of your throttle curve. Turn up the left endpoints of your throttle curve in idle up.

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01-27-2007 03:22 PM  10 years agoPost 13
Toro

rrApprentice

Southern Cal

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You using a plastic head block on this w/ blue dampers ?

That might be your problem if it is for the inverted shake. The blades are being loaded when you flip, and as your leading/lagging blades come in and out of the lift its causing this shake due to a soft head as the blades never catch up right.

MY .02... can I have my change now ?

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01-27-2007 10:14 PM  10 years agoPost 14
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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I took my belt out last week to check it. Actually had 2 teeth missing (from a crash I guess). You said you crashed it. I'd check the belt real good.

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01-27-2007 11:40 PM  10 years agoPost 15
jimco

rrApprentice

east texas

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Need to check your dampers. If black, go to red, could be blade tracking getting you.

Honey, where's the check book, it's Fedex again

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01-28-2007 05:27 AM  10 years agoPost 16
NORTHERNLIGHTS

rrVeteran

Riverview FL

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If you aren`t running a Govenor try increasing the throttle curve. sounds like the head is shaking from the rpm on the rotor becoming lower

B.O.A.T. Break Out Another Thousand!

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01-28-2007 09:17 PM  10 years agoPost 17
mickeyapples

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England

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Is the gyro stuck on ok

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01-28-2007 09:57 PM  10 years agoPost 18
falcon

rrKey Veteran

UK

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sounds like the head is shaking from the rpm on the rotor becoming lower
I would go with this one from NORTHERNLIGHTS. sounds like he's on the right path to me.

www.m0kwr.com

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01-29-2007 01:45 AM  10 years agoPost 19
mdv6738

rrNovice

Wilson, North Carolina - USA

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Local flyer here had a similar problem and is ended up being a motor tuning issue. We spent a few flights getting him back in tune and his t/r shakes area gone.

No need to be scared the ground is always there to catch you!!

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01-29-2007 04:50 PM  10 years agoPost 20
jmsilhy

rrApprentice

Austin, Texas

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Great info guys. I will try all your suggestions this weekend, hope I get it sorted out. Also, I'm going to check all my ball screws, tail belt, fuel lines... I'll let you know how it turns out.

Thank you all!

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HelicopterThunder TigerOther › Help diagnose R50 problem please.
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