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Blade
Blade mCPX › High speed tail vibes
02-03-2012 01:15 AM  6 years agoPost 1
Machinehead01

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Lower Michigan

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Anybody tried to balance their tail on the MCPX? I just picked up the V2 today and love it except for that I have a high speed tail vibe going on. How would you suggest balancing such a small piece?

Tom

"You judge according to the flesh; I am not judging anyone."

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Blade mCPX › High speed tail vibes
02-03-2012 03:31 AM  6 years ago •• Post 2 ••
xv-townboy

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Abbotsford.bc. western canada

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Just get another one its only a two dollar part

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02-03-2012 04:19 AM  6 years agoPost 3
drdot

rrElite Veteran

So. California, Orange County.

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fwiw..

Found a 3" piece of music wire the right diameter...Placed the t/r blade on this makeshift shaft, used two drinking glasses as straightedges....Makes balancing a snap...Just sand down the heavy blade a bit....Bob's yer uncle!!

John.

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02-03-2012 02:07 PM  6 years agoPost 4
Machinehead01

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Lower Michigan

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Thanks doc...
The tail is vibing up and down so fast it's a blur. So I know it's got to be the blade.

Tom

"You judge according to the flesh; I am not judging anyone."

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02-03-2012 04:35 PM  6 years agoPost 5
Rafael23cc

rrKey Veteran

Junction City, KS

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I've got a similar problem but the vibrations are not apparent at the begining of the flight. Only after a few maneuvers is when the vibes really show up. I'll try balancing the tail rotor, but can the vibes be caused by somehting else?

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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02-03-2012 05:16 PM  6 years agoPost 6
Machinehead01

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Lower Michigan

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Could also be...
Your mains being to tight, Raf. With so little mass they can come out of alignment with each other if the screws are to tight.

Tom

"You judge according to the flesh; I am not judging anyone."

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02-03-2012 05:33 PM  6 years agoPost 7
Rafael23cc

rrKey Veteran

Junction City, KS

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Thought about that, but it started when the mains were still flopping around like when the heli came out of the box. I've since tried various tightness "levels" with no change.

I'll try to "balance" the tail rotor first. BTW, I'm not the only one with that problem around here. I've seen at least two more V2 with the same problem.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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02-03-2012 09:43 PM  6 years agoPost 8
JKos

rrProfessor

Redondo Beach, CA

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My V2 came with an extra tail blade. Did you try the other one to see if the behavior changes?

- John

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02-04-2012 07:03 AM  6 years agoPost 9
Machinehead01

rrVeteran

Lower Michigan

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Nope...
I didn't realize that it came with 2. Thanks, I will check it out tomorrow.

Tom

"You judge according to the flesh; I am not judging anyone."

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02-04-2012 07:23 PM  6 years agoPost 10
Swoop

rrElite Veteran

Newark, DE USA

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Hows your tracking? I had similar vibes with stock blades and tracking was out 1/8 inch (new out of the box). Tried twisting the blades with not much luck. Replaced mains with KBDD and tracking is almost perfect and no vibes.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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02-05-2012 04:35 AM  6 years agoPost 11
drdot

rrElite Veteran

So. California, Orange County.

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Fwiw..

As I've played with this little gem, I have noticed that little thing that we take for granted on larger helis make a substantial difference...Anyting that is off in alignment or balance will cause vibes, which seem to feed back into the gryos in the main board, which then amplifies the problem...
Per the posts of others on this and other forums, I've begun to be real old school..I check and balance mains, tails; keep good main gears on the heli to avoid vibes caused by ragged teeth..Lots of attention to detail...When you go brushless, these issues are magnified a great deal by the increased headspeed..I am going to 3 mm tail boom to see if increasing the rigidity of the boom will help with vibe issues...

It's all good!

John.

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02-05-2012 03:49 PM  6 years agoPost 12
Machinehead01

rrVeteran

Lower Michigan

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Good points, Doc...
It would make sense that things being what they are (smaller machine=smaller parts), that an out of balance condition would definately be more noticeable with the machines lighter mass. I changed the tail blade out and for the 1st 30 seconds things were good or to say the least, better. Then the vibes showed back up, intermitent at first, then constant about 2 min into the flight. Something that was also proposed in a conversation with another owner was letting the heli/gyros acclimate to the ambient temp(outside flights so far).

Tom

"You judge according to the flesh; I am not judging anyone."

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