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Century Radikal E640 - Swift 16 NX
› Swift vibrations solved
02-06-2006 11:36 AM  12 years agoPost 1
aerodynamic18

rrApprentice

Lisburn,N.ireland

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Ok i have had the strange oscillation on spool up and down but after talking to century it is solved. On the way up you just need to give it more power and it dissapears v quickly. When you land have throttle hold on so the head spped is kept and then close your stick down so you should have negative pitch. Once this is down kill the throttle hold and the blades slow down faster and the shaking is almost non existant. Im well happy now with my swift

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02-06-2006 04:18 PM  12 years agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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THIS WAS THE SOLUTION FROM CENTURY?????
You have got to be kidding.

It SHOULD not vibrate.

~~Enjoying the hobby one flight at a time~~

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02-06-2006 04:29 PM  12 years agoPost 3
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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hey doc, i have this sharp, stinging pain when i lift my arm above my waist.

doc: if your arm should already be above your waist for some reason, you should completely relax your deltoid muscle until it falls down to your side. in the future, you should not raise your arm above your waist.

if it ain't broke, break it.

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02-06-2006 04:47 PM  12 years agoPost 4
coolice

rrKey Veteran

Northamptonshire, England

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Hey,

All models vibrate on spoolup/down/inflight to some degree, on the Swift it is magnified by the tall, spindely under carriage which makes it look worse. My turbine does for instance now I have fitted longer blades while they are straightening out, both on spoolup & down. Some models it is more apparent on than others, head damping as has been proved makes a big difference to where in the RPM range this happens.
In the past other models have suffered from even worse vibration on spoolup/down and so it is not uncommon at times.
Lets not forget the sudden power delivery from an electric model is capable of swinging the blades back in the grips slightly on spoolup and this will knock the balance out until they move back inline with the centrifugal force.

I have found during spoolup it soon passes, there is only a certain RPM band that cause the resonance. It is spool down that I find to be a little worse.
However as mentioned in the first post using the throttle hold trick helps stop this happening. Basically by using up the head speed stored in the blades by adding positive pitch after shut down, the model passes through the resonance RPM band faster as the head speed is shed quicker and so it is not seen.

Of course you can still help further by adding a Hawk U/C which is not quite so tall and beefier if you so desire to cut it down to a minimum.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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02-06-2006 05:12 PM  12 years agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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based on coolice reply...
I have yet to test my new landing gear set up...will post finding later.

~~Enjoying the hobby one flight at a time~~

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02-06-2006 05:23 PM  12 years agoPost 6
aerodynamic18

rrApprentice

Lisburn,N.ireland

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to be honest it isnt a vibration more of an oscillation. It it was a problem elsewhere it would be aparant during flying as well

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02-06-2006 07:15 PM  12 years agoPost 7
Lenny970

rrNovice

Colorado

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I didn't see much head oscillation the first time I spooled mine up, but I've definately got it now. On spoolup it looks like it wants to shake itself to pieces. I can see how the main shaft could easily get bent from this stress too.
I have lubed the dampeners and tried adding an extra shim, but still can't solve it. I've tried tight blades and loose blades to no avail. I hope a good answer presents itself soon...........maybe an aftermarket head that runs smooth. Credit card at the ready!


Lenny

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02-06-2006 08:36 PM  12 years agoPost 8
OICU812

rrMaster

Edson, Alberta, Canada

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hey doc, i have this sharp, stinging pain when i lift my arm above my waist.

doc: if your arm should already be above your waist for some reason, you should completely relax your deltoid muscle until it falls down to your side. in the future, you should not raise your arm above your waist.
That was great, nearly rolled off the chair on that one, lol.

...Once upon a time there were Nitros, flybars and frequency pins...

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02-07-2006 01:06 PM  12 years agoPost 9
rotaryguy

rrApprentice

Florida

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This is BS, there is a REAL SOLUTION
I have posted a real solution in my original thread on ezone and it just gets passed by.
There is a casting flaw in the head and/or grips plain and simple.

I had VERY SEVERE spool down vibes and after spending hours of checking, lubing, putting washers on and whatever else was suggested I decided to simply try a new head block and main blade grips.
PROBLEM SOLVED There were ZERO changes made outside of replacing these two parts.

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02-07-2006 02:04 PM  12 years agoPost 10
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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rotaryguy - So you just ordered new parts from Century, rebuilt the head and grips and it all went away?

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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02-07-2006 02:40 PM  12 years agoPost 11
rotaryguy

rrApprentice

Florida

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Boyd,
That is it exactly, I fought with this thing for several weeks changing out feathering shafts, main shafts, blades, etc.. I tried an assortment of shims and o-rings in the head and nothing completely solved the problem.

Finally I bought a new head block and main blade grips and installed them changing nothing else and the shakes went away, completely. It spools down just as smooth as my logo 10 now.

I must add that there was a visible difference in the main blade grip castings, the casting marks that are visible on the blade grips are on the tops of the new grips and the bottoms of the old ones, and yes they are installed properly. This may mean absolutely nothing and there may not be anything at all wrong the grips, it may be all in the head and I had originally planned on swapping the parts one at a time to verify that it was one or the other but I was so fed up with it I was just happy to have it fixed finally and want to fly now.

I hate to say it may be like the lottery buying a new head and grips as you may end up with another bad one.

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02-07-2006 04:53 PM  12 years agoPost 12
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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Thanks for the reply. Off to order, seems like a small price to pay after weeks of frustration.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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02-07-2006 11:37 PM  12 years agoPost 13
Lenny970

rrNovice

Colorado

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RG,
Guess I missed your RCG thread about a casting flaw somehow. I'm willing to try a new head a grips. Parts ordered.

Thanks,
Lenny

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02-07-2006 11:50 PM  12 years agoPost 14
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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so, i guess the only thing left to really dial it in is figure out if it's the headblock or the grips. since there are a few of you ordering parts, anyone feel like a guinnea pig? draw straws? one of you replace the head, and the other replace the grips???

it'd save everyone from having to order both if it is only one of the parts.

if it ain't broke, break it.

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02-08-2006 02:51 AM  12 years agoPost 15
GofastSam

rrNovice

Vidor , Texas USA

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Got a second swift on trade and very bad shake spooling up or down and some viberation in hover using 515 rotor techs or 530 razors. Noticed more of a gap between main block and blade holders on one side so Disassembled head assy. and took blade axle and put in lathe and machined flat on ball so that blade axle slides thru the head block with no drag ( if holes are not cast incorrectly in head block will cause blade axle to be off centered and hence related problems ). Reassembled head assy. and upon spoolup very minimal shake and in hover with 2050 rotor head speed very smooth and minimal shake spooling down. Will try to get some flights on helicopter this weekend and report how it compartes to stock one with no problems.

Sam Anderson

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02-08-2006 04:25 AM  12 years agoPost 16
OICU812

rrMaster

Edson, Alberta, Canada

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Boyd let us know if changing out your grips and mainblock fixes it for you!

...Once upon a time there were Nitros, flybars and frequency pins...

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02-08-2006 02:56 PM  12 years agoPost 17
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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New parts are on the way via DHL Ground. Supposed to be here on the 14th. I'll post my findings.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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02-08-2006 04:35 PM  12 years agoPost 18
Tim101

rrNovice

wixom, mi

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I have swift with castings on top had vib. from day 1 on 2nd. spoolup it through a main blade missed me by 2" i think century should take care of this befor some one gets injured!!!! by the way it coust me $60.00 in parts & shipping to fix that i think century should pay for!! I will call & see if they will reimburse me & i will let you all know the resualts.

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02-08-2006 05:43 PM  12 years agoPost 19
Pistol Pete

rrProfessor

Seffner, FL

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on 2nd. spool up it through a main blade missed me by 2"
Did main grips or m4 bolt break?

Did you epoxy plastic root ends to blades as stated in section 9.2?

Glad it missed you...Better luck next time.

*

~~Enjoying the hobby one flight at a time~~

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02-08-2006 06:33 PM  12 years agoPost 20
cocorico

rrNovice

France

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hello,
the hole where is fixed the blade of one of my main blade grip is slightly out of center.
Do you observe the same thing?

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Century Radikal E640 - Swift 16 NX
› Swift vibrations solved
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