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Old Nov 26, 2012, 08:13 PM
Augernaut
Wookster's Avatar
United States, KS, Overland Park
Joined Jan 2010
1,448 Posts
Help!
Blade 450 3D post crash repair....unstoppable vibration.

I give up. Throwing this out to the RC world as a last tidtch attempt for help. Managed to hover me 450 into a brick wall (long story). I have replaced the CF blades, the flybar, the tail rotor grips, the tail rotor cyclic control. Put her all back together and she shakes. Checked the flybar, its 100% even on each side. checked blade tracking...perfect. Went and put in a new mainshaft and spindle for and giggles. No bueno. Doesn't shake without the blades, with the blades I'm worried she's going to strike the rotors on the ground. once in the air you can plainly see the tail vibrating so something is out of whack. Any thoughts out there?
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Old Nov 26, 2012, 08:23 PM
Need More PURPLE !!
Dejavu*Xion's Avatar
United States, NV, Las Vegas
Joined Aug 2012
3,678 Posts
Could be a multitude of things. whats your head speed ? lets start there.
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Old Nov 26, 2012, 08:50 PM
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Philippines, Calabarzon, San Pedro
Joined Jul 2012
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I presume you've done blade tracking?
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Old Nov 26, 2012, 09:22 PM
Augernaut
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United States, KS, Overland Park
Joined Jan 2010
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Quote:
Originally Posted by Hajile View Post
I presume you've done blade tracking?
Yup, I use a system similar to what we use to calibrate our printers. take 1/16 inch tape and line the LE of the rotors. One blade has two lines. the other has one line that fits between the gap of the other two. adjust tracking so tht it looks like a solid line and its perfect. the vibe is most prominent during spool up, but at speed he tail fin is a blur so i iknow something is amiss, I'm just running out of parts to replace.
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Old Nov 26, 2012, 09:52 PM
Get to the choppa!
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United States, PA, Pittsburgh
Joined Sep 2012
358 Posts
Did you make sure your blades were balanced? Could also be your head block, but you would see a visual wobble when the head spins.

http://www.amainhobbies.com/product_...or-Housing-Set
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Old Nov 27, 2012, 12:17 AM
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Philippines, Calabarzon, San Pedro
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I just received the hex bolts for the tail holder in the mail so i finally put the 450 back together. Changed the feathering and main shaft but it was still vibrating really bad. Leveled the blades, tracking is perfect, it still wobbles. Then i had a thought and removed the blades and canopy and spooled it up while looking at it up close. The main gear was wobbling, apparently some of the teeth got shaved in the last crash.

I'm gonna have to take the head apart again to get at it I'm done for today, gonna go our and fly the GeniusCP. Try checking your main gear.

EDIT: Finally swapped main gear... YAY! Butter Smooth Spinup!!! Now i have to level the blades again
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Last edited by Hajile; Nov 27, 2012 at 03:43 AM.
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Old Nov 27, 2012, 10:14 AM
Augernaut
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United States, KS, Overland Park
Joined Jan 2010
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Quote:
Originally Posted by RFDelie View Post
Did you make sure your blades were balanced? Could also be your head block, but you would see a visual wobble when the head spins.

http://www.amainhobbies.com/product_...or-Housing-Set
I'm using carbon fiber blades. I thought they didnt need balancing.
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Old Nov 27, 2012, 10:37 AM
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United States, LA, Oak Grove
Joined Oct 2006
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yes u need balance them i got a set of radix frist set i didnt have to balance they cost more but they worth every penny
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Old Dec 03, 2012, 12:01 AM
Augernaut
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United States, KS, Overland Park
Joined Jan 2010
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Found the issue. Apparently the $36 CF blades from horizon hobby that are "precision balanced" are not. Was about to give up on this bird when out of desperation we put the blades on a balancer at the LHS. It took two metal screws on the tip of the blade to make it balance. Hobby store folks were kind enough to give me a new set. She runs perfectly now. So just a word to the wise. those "balanced" Carbon Fiber blades are anything but.
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Old Dec 03, 2012, 04:14 AM
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Australia, VIC
Joined Dec 2011
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Lets isolate the problem

Take of the rotor blades and spin it on the ground , does it vibrate ?
Take of the tail rotor blades , does it vibrate ?

This is the starting point ,

Find out where the vibration is coming from ..
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