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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Shaking problems in Swift 16
04-02-2009 08:13 AM  9 years agoPost 1
vadmcse

rrApprentice

Barcelona - Spain

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Could anyone tell me if this is normal?

http://www.youtube.com/watch?v=AIJKnSL0Vsc

Is a swift 16 with with Castle 60Amp ESC, Century Sport motor, 550mm carbon blades, 5000Mah 4s LiPo pack.

The blades are perfectly balanced, everithing is fine.
Anmounted the entire heli last weekend to chek all the parts.

In the video you can see that at the beggining the tail rotor makes something strange, then the counterclockwise turn, and at the end, this shake.

Is there anything wrong?

Thanks

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04-02-2009 01:34 PM  9 years agoPost 2
Dilbeck

rrElite Veteran

Springdale Arkansas

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Looks perfectly normal to me for being on a hard surface. Maybe some rubber tubing on the landing skids will help.

Clint

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04-02-2009 05:09 PM  9 years agoPost 3
imnxtc

rrVeteran

BC.Canada

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The initial vibration is caused by the ground resonance on a hard surface, Yjis is caused by your blades initially not being stretched out into their normal flight position. As the rotor gains speed, the blades move into their normal lead/lag position and everything smooths out.

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04-02-2009 05:34 PM  9 years agoPost 4
vadmcse

rrApprentice

Barcelona - Spain

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ok,
Thank you so much!

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04-04-2009 05:36 AM  9 years agoPost 5
ClubJAX

rrNovice

El Dorado County, California

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did you get your vibration fixed?

Also looking at the hoving it might help in flatening your pitch around hover to reduce the ups and down.

good luck
jax

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04-04-2009 06:04 AM  9 years agoPost 6
CompyMike

rrVeteran

sacramento, ca

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I'm sorry I've watched this video three times and I just don't see any vibration issues at all.

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04-05-2009 09:47 AM  9 years agoPost 7
vadmcse

rrApprentice

Barcelona - Spain

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Jax: What do you mean "flatening"?

Mike: Well is not vibration, is the way the tail shakes at start and stop.

thanks

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04-05-2009 05:17 PM  9 years agoPost 8
Ravenhyper50

rrKey Veteran

Canada's Capital

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Perfectly normal... Swifts don't like to be on the ground!

They get pissed off and throw a tantrum when the flight is over

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.
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Simple fix is to not be on such a hard surface and some stronger/stiffer landing gear helps a lot if you still have the problem on grass or softer ground.

Another trick to get rid of the shakes when landing is to move you collective stick changing the pitch of the blades when your spooling down.
Auto rotations also prevents the shakes because most of the blade energy gets used up on landings.

FYI All three of my swifts have done this and its no big deal they all fly great!
Swift 16, Swift 550, Swift 620SE

Cheers,
Raven

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04-06-2009 07:05 PM  9 years agoPost 9
CompyMike

rrVeteran

sacramento, ca

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Yah I just hover maidened my Swift 16
Scorp 4025 -740
550 blades
CC HV 85
JR 770
All digital servos.

Spooled up really nice. Very slight shake at low rpms but smoothed out like butter.

Hovered very stable on a small back patio.

Landed. spooled it down. Then at a certain rpm it started dancing and shaking. I thought it would spill over.
Maybe my blade grips are too tight or one is tighter than the other. Need to put the heli on it's side and do the
shake test to see if the blades drop at the same amount. It's not as bad if I go to zero pitch and hit throttle hold.

Scared the (#$@!!) out of me though.

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04-06-2009 07:13 PM  9 years agoPost 10
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i have a feeling thats normal. that seems to happen with any helicopter landing on a hard surface.

my Trex 450 shakes and dances like crazy when spooling up and down on a hard surface like a table.

just yesterday i landed my Raven 50 on a picknick table, and it did the exact same thing.

my Predator will shake around a little when spooling up, but it never seems near as bad.

if i put any of those helicopters on the grass, its fine.

Shawn
Team Leisure-Tech
Team HelixRC

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04-09-2009 07:19 PM  9 years agoPost 11
Pistol Pete

rrProfessor

Seffner, FL

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Try the following...

>Using calipers measure whatever amount coming out of the nut is equal for both main grips. This after doing the side bump making sure the blades have some tension.

>After a full spool up and without taking off, spool down and make a mark (ie: sharpie,nail polish) or score a line on both sides of blade grips per blade. (i use a pocket knife and score lightly)

This is your reference line and if your blades moved at any time during spool up or down, they are not tight enought.

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

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04-09-2009 08:34 PM  9 years agoPost 12
CompyMike

rrVeteran

sacramento, ca

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I'll try that thanks pete.
I don't get the chicken dance when the swift is on grass.
My Century Hawk doesn't do this when I land on a hard surface.

If I go full positive in thottle hold before the start of the chicken dance it behaves ok.
I'm thinking about doing some strut supports between the landing gear skids. I think the LG I have on it are
stock LG gear.

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