RunRyder RC
WATCH
 3 pages [ <<    <     1     ( 2 )     3     NEXT    >> ] 4587 views Post Reply
Home✈️Aircraft🚁Helicoptere-BladeBlade 130 › Everyone with Tail Vibes on spoolup
08-01-2012 04:44 AM  9 years ago
BobOD

rrElite Veteran

New York- USA

MyPosts All Forum Topic
As you are well aware, a main rotor blade flying out of track causes a shutter in the entire body of a helicopter..
Actually it is more like this.
A main rotor blade that has more lift than the other will cause a shutter because the unbalanced lift is rotating around. It will also cause one blade to track higher than the other.

Note, this does not mean that if a blade tracks higher than the other, it will cause a shutter. Eddies and all that is an interesting thought...but not the primary cause of the shutter in a main rotor that's not tracking.

Now, the angled hub may very well be causing more pitch in one blade than the other becaust what this does to the geometry of the pitch yoke. But this seems small to me and doesn't explain why my 130 does not have this issue....even though my hub is at about a 2 degree angle. It looks sloppy indeed, but I'm not sure it's the root cause is all.
Team POP Secret
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 04:46 AM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Oh, just a note on the guy at the LHS.. Skin and flesh makes a great vibration dampener.. To bad we can't fly with it on there. :-)
Well so far in my tests a rigid tail fin that is not tuned to the resonant tail assembly's frequency,,[rigid] has fixed it and I will know tomorrow. Have you ever seen a real heli go through the same type of thing? The whole heli will shake at a certain frequency and if not corrected by the pilot in time will destroy itself. I believe it it is a ganging of tolerances ..either good or bad. We shall see.
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 04:53 AM  9 years ago
spoolemup

rrApprentice

NJ - USA

MyPosts All Forum Topic
A main rotor blade that has more lift than the other will cause a shutter because the unbalanced lift is rotating around.
I was giving the abridged version, but yes, If one blade is putting more drag (or lift), than the other, it will cause a vibration in the helicopter.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 04:57 AM  9 years ago
spoolemup

rrApprentice

NJ - USA

MyPosts All Forum Topic
to turboomni
I couldn't help but wonder if you tried the other tail output shafts you mentioned in your earlier post..

You stated that you purchased them, but have you used them?

Have you taken the stock one out to see if it was off center?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 04:58 AM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Remember woof and Poof of the Raptor 50??? If not look it up.Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 05:01 AM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
I couldn't help but wonder if you tried the other tail output shafts you mentioned in your earlier post..

You stated that you purchased them, but have you used them?

Have you taken the stock one out to see if it was off center?
Before I flew my 130x I tore it apart to replace bearings etc,,and my tail shaft was a joke. Not even close to 90 degrees. My new one is true.
I think I may be close to really ironing this slight vibration out of the equation on this nice little bird.
I will see tomorrow.
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 05:35 AM  9 years ago
T-rexn8

rrKey Veteran

CoLoRaDo

MyPosts All Forum Topic
Some great ideas here guys. Interesting points made

My position with this heli is this, It is a great, fun piece of heli with a bit of a sh*t tail.

Make the best of it, reduce/ mask vibrations as much as possible and just fly it in to the pavement
Xxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 05:38 AM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Will do T-rexn8!! I am having a ball with this thing!!Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 04:12 PM  9 years ago
bigben1165

rrKey Veteran

grand rapids, michigan

MyPosts All Forum Topic
im loving my 130x, although i am having some vibration issues with it. i will start replacing bearings first i think. who has a good source for bearings? boca?big ben - e550 fbl - DX6
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 05:41 PM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Here are a few examples of full scale helicopter resonance or ground resonance.

Watch at YouTube

Watch at YouTube

And a technical description

http://www.heli-chair.com/aerodynamics_102.html

I dont think this is what is happening in the tail of the 130x exactly but my present hunch is the tail fin's tuned frequency makes the problem alot worse. I am going to test fly it now and post my results.
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 05:43 PM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Ooops two of the same thing,,sorry

Watch at YouTube

Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 06:21 PM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Test flew it and it was interesting. The vibration is not seen or heard on normal spoolup or spool down anymore. I then spooled it up very slowly to try and find it. I found it and it is at a lower tail rpm than before the carbon rods on the tailfin. So I guess I must have changed the tailfin resonant frequency far enough away compared to a stock tail fin so it would not amplify the problem. On normal spool up I dont notice it. So far,,,,,,,,,,

Ben Boca is good.
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 06:24 PM  9 years ago
spoolemup

rrApprentice

NJ - USA

MyPosts All Forum Topic
I know what you mean.. This little bird is a hoot.. LOL
Big heli fun in an briefcase
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 06:34 PM  9 years ago
spoolemup

rrApprentice

NJ - USA

MyPosts All Forum Topic
That Chinook had a giant 300S Lipo failure.. Or Speed controller. - I can’t tell..

Can you imagine a pilot sitting in that thing?.. Ride-Em Cowboy!!!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 07:16 PM  9 years ago
bigben1165

rrKey Veteran

grand rapids, michigan

MyPosts All Forum Topic
130x specific case
i noticed that the mcpx has a case made for it from HH, and now the 450's from blade have a cool alum case. i hope they make one for the 130x. i know i can make one, but cutting the foam always looks like crap for me.
big ben - e550 fbl - DX6
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2012 07:56 PM  9 years ago
BobOD

rrElite Veteran

New York- USA

MyPosts All Forum Topic
Big heli fun in an briefcase
NICE!
Team POP Secret
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2012 01:47 AM  9 years ago
bigben1165

rrKey Veteran

grand rapids, michigan

MyPosts All Forum Topic
i agree!big ben - e550 fbl - DX6
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2012 03:37 AM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Well it is smooth,,up and down after 6 flights today. I tried to make it happen and it doesn't .
I use the Harbor Freight case and I find it will carry the 130x and my mcpx + TX and lipos for both no problem
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-03-2012 03:41 AM  9 years ago
mrford

rrApprentice

elmwood park nj usa

MyPosts All Forum Topic
tail vibes
Well I just got my 130 Maj from my local hobby shop set it up for me with my glass of wine setup . You fly a hover and take a sip of wine and it doesn't crash. Well It had a terrible tail vibe !!! There was a guy flying one and he said put some fuel line on the tail fin so I took 2 inches and slit it 1 and a half inches and slid it on from the bottom and left the half inch hang off the end this keeps the tail blades from hitting the ground it supports the tale so you don't get the spin around on start up and lowers the resonance so its almost gone. It fell off and vibe came back put it back and it was gone again This seems to damp it out its masked until some one makes a GOOD replacement tale unit !!! Try it let me know how it works I flew 6 times and its 90 percent better !!! lots of luck love this little bird I will take it to work and fly every day should help me fly a little better thanks Vic
fly happy live long
SHARE  PM  EMAIL  Attn:RR  Quote
08-03-2012 04:16 AM  9 years ago
turboomni

rrProfessor

East of the Equator

MyPosts All Forum Topic
Seems the same as what I did although different materials. You changed the the resonant frequency of the tail fin so it did not amplify the problem in the tail. When it fell off it returned.

I also found the boom offered very little resistance to torque . Not lateral but twisting like you were opening or closing a faucet. Very boucey. I can understand that the few that lengthened the tail boom supports had better luck also
Setup is everything, All my heli's can fly far better than I can pilot them
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 3 pages [ <<    <     1     ( 2 )     3     NEXT    >> ] 4587 views Post Reply
Home✈️Aircraft🚁Helicoptere-BladeBlade 130 › Everyone with Tail Vibes on spoolup
Print TOPIC

 10  Topic Subscribe

Sunday, September 19 - 2:02 am - Copyright © 2000-2021 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online