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Home✈️Aircraft🚁HelicopterHIROBOHirobo Sceadu › Main rotor vibration
03-03-2017 07:48 AM  29 months ago
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Kevinpilot19

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Largo, FL - USA

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Main rotor vibration
I have a Sceadu 50 and it have an extreme vibration in hover. The blades are balanced and tracked. I don't know what else I can check. Maybe bend shaft?

Please I need some advice. I bought this heli a year ago and hardly can hover it.
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03-03-2017 10:21 AM  29 months ago
iyoy

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Bacolod City, Philippines

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Possible parts
Usually after a crash or collision, the damaged parts needing replacement are:
1) main mast
2) feathering spindle
3) yoke
iyoy
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03-03-2017 10:57 PM  29 months ago
Kevinpilot19

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Largo, FL - USA

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I will consider change those parts. I bought the heli like that and before I bought it spend many years in a shelf... thats what I was told.
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03-04-2017 01:48 AM  29 months ago
tommytt1

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Mercerville, NJ, USA

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You need to check all the shafts and yoke that Ivoy told you to, then reassemble the spindle with grease on it and the dampeners. Next reassemble the blade grips and bearings with grease making sure the thrust bearings are smooth and put together correctly. If it has a flybar make sure it's centered perfectly by measuring it. Align the paddles by eyeing the inside trailing edge to the center of the flybar to the center of the fb carrier repeat to the other paddle and give it a go.I made a mistake once, but I was wrong?
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03-05-2017 04:11 PM  28 months ago
tommytt1

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Mercerville, NJ, USA

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I forgot to mention checking runout of the clutch shaft. It can be a major contributor to vibes in the sceadu. Every hirobo I've owned had to have this shaft adjusted (bent). I made a mistake once, but I was wrong?
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03-05-2017 10:32 PM  28 months ago
Dr.Ben

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Richmond, VA, USA

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You need to detail the vibration. Boom and/or or shake or fins buzzing and fuel foaming?

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-08-2017 03:02 PM  28 months ago
Kevinpilot19

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Largo, FL - USA

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No fuel foaming. The whole frame vibrates. Sometimes vibrates and suddenly stops shaking for couple of seconds then it starts again.
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03-08-2017 04:06 PM  28 months ago
Kevinpilot19

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Largo, FL - USA

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Here are couple videos.

Watch at YouTube

Watch at YouTube

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03-09-2017 12:23 PM  28 months ago
tommytt1

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The first video showed the engine running a little rich and the second vid seemed lean and a high head speed.
Did you check all of.the things mentioned above?
I made a mistake once, but I was wrong?
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03-09-2017 12:48 PM  28 months ago
tommytt1

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Mercerville, NJ, USA

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http://rc.runryder.com/t18279p1/

http://rc.runryder.com/t31020p1/

Engine tune, tail belt too tight and all the stuff above can cause vibes. Take your time, it's definitely one of the things mentioned.
I made a mistake once, but I was wrong?
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03-09-2017 02:30 PM  28 months ago
tommytt1

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Mercerville, NJ, USA

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Also try the search function, there is a lot more info on the subject that has been covered a bunch of times. I made a mistake once, but I was wrong?
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03-09-2017 10:32 PM  28 months ago
Tron

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Morgan Hill, CA

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I know you said blades are balanced and tracked (however you then say you bought the heli like that later) but you could try a new set of main blades if the usual suspects don't work.
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03-10-2017 06:49 AM  28 months ago
Kevinpilot19

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Largo, FL - USA

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Tron I have tried two sets of blades already, the originals that came with the heli and the new ones i'm currently using on my Align 600N. Same vibrations with both sets.

I will try to check everything you guys have said. Thanks everybody!!!
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03-10-2017 12:03 PM  28 months ago
tommytt1

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Mercerville, NJ, USA

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Let us know what it was I made a mistake once, but I was wrong?
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03-10-2017 08:00 PM  28 months ago
Tron

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Morgan Hill, CA

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flybar weights equal?
I'm referring to the lead, brass, or both weights inside the flybar paddle.
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03-16-2017 05:26 PM  28 months ago
Bugcatcher

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Perth, Australia

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Tron, I was actually about to suggest looking at the flybar & paddles.

Things to looks for.
1. Paddles are the same distance from mainshaft. Check with calipers.
2. Check paddle weight. Sceadu/SDX have removable weights. Maybe just try removing all weights instead of removing paddles. Usually they pretty close but sometimes people cut a bit off instead of removing all the lead or brass weight.
3. Remove the rods/links from the flybar cage so it can move on it's own weight. All rodends and balls should be nice and free without resistance. If the flybar constantly falls to one side then you have a balance issue with the flybar. Correct until the flybar balances nicely.
4. Check blade bolts. Sometimes they can be bent.
5. Check spindle. Easy way, leave one blade on and turn the spindle looking for any movement at the end off the blade still connected. Keeping one blade one will amplify if the spindle is bent.
6. Check main shaft, best way to check is by rolling it on a flat surface like glass or maybe a granite bench top if you have one.
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03-20-2017 05:28 PM  28 months ago
Kevinpilot19

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Largo, FL - USA

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I have a buddy that got one of the same helicopters and I hover it last night and it has the same issue, but we decrease the pitch a little bit on the pitch curve and the vibrations were all gone. So I might try that in mine too. Sorry I have not post an update, I'm working in couple other projects at the same time and my job schedule don't help me too much (10 hours, 6-7 days) so I have to split the spare time between my family and the hobby.
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