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Home✈️Aircraft🚁HelicopterHIROBOOther › evo 50 bent spindle?
07-20-2006 02:04 PM  14 years ago
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LARKS

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Lake Charles, Louisiana

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evo 50 bent spindle?
Whats the deal with the spindles bending in flight? I've 10 gallons through my machine and haven't noticed the blades going out of track or head shake. How do I check to see if the spindle is bent? Also will using aftermarket dampners inprove flight performance?
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07-20-2006 02:22 PM  14 years ago
Leif

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USA

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They tend to bend with any "incident", whether that is a hard auto or a momentary flutter (woof) in the main blades. A slightly bent spindle won't always show up as a tracking problem in a hover, but it usually produces significant vibrations.

The easiest way to check for severe bends is to remove one blade and then turn the spindle using an allen wrench. Hand onto the grip when you do this. If you have a bend, the tip of the other blade will move. Depending on where the bend is you might need to do this on both sides to get a reliable reading.

The precision way is to remove the spindle and chuck it in a drill press or lathe and check it with a dial indicator.

Hard aftermarket dampeners (Carbon Extreme or Infinivation) make the head system more rigid. In my experience this does help reduce the possiblity of bending due to normal flight stress but doesn't solve the issue of them bending when you bounce off the ground. The SD-G yoke is another possible upgrade that stiffens up the head, but I don't have experience taking that route.

I've tried both the Hirobo and Quick-UK spindles. I haven't seen any difference between the two. Just lay in a bunch of spares. They're not that expensive and are very easy to replace. Some guys try to straighten them, but unless you have the right tools it's pretty time consuming.

Leif
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07-20-2006 02:26 PM  14 years ago
shlm

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West Chester, PA

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I have yet to bend a spindle in flight in over 3 years with my EVO50 flying 3D and I do perform some very agressive maneuvers. But getting to your question how would you know if it was bent? Your blades would go out of track and possible change in the amount of out of track as the spindle rotates in the head. Bottom line is that if you find that you need to re-adjust your tracking w/o changing the setup or blades, there is a good chance that the spindle is bent or something is cracked, broken, or loose. In addition, if you have the spindle out of the heli you can check it by rolling it on a very clean piece of glass and look for a wooble.
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07-20-2006 02:51 PM  14 years ago
DS 8717

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My stock spindle bent without any incident at all,it is very soft. Certain blades will bend it if you are agressive. I replaced it with a Quick UK spindle and it has not bent yet. DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-20-2006 03:21 PM  14 years ago
shlm

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DOUGLAS,

Can you please provide some additional insight? What blades, dampners, maneuver were you performing. I run the V's on my and again have not had any issues. Perhaps if you are using some blades that are "unstable" that could cause unusual load on the head spindle. Just a guess though.
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07-20-2006 03:25 PM  14 years ago
DS 8717

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I was using V blades,with Infinivation dampners. I used the CX dampners first but those developed play and only have 1 o ring on each side,i switched to the Infinavation dampers which have 3 o rings on each side. DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-20-2006 03:29 PM  14 years ago
GScott

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Lewis Center, OH

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I upgraded to the SDG metal head and haven't had a problem since. The SDG head is wider and allows you to run an extra pair of dampers. This seems to have helped a great deal.
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07-21-2006 12:02 AM  14 years ago
LARKS

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Lake Charles, Louisiana

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What's everyone using to lube your dampners oil or grease?
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07-21-2006 12:33 AM  14 years ago
Leif

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When I'm forced to use the stock dampeners (like now... dang CX things are out of stock everywhere) I use teflon grease.

Leif
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07-21-2006 11:13 AM  14 years ago
geeo

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Edinburgh, Scotland

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Is it only the stock dampners that need oiled/greased?
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07-21-2006 12:17 PM  14 years ago
RayJayJohnsonJr

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Midwest

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What's everyone using to lube your dampners oil or grease?
I use Dow Corning DC4. It's a silicone grease.

-Mark
There, their and they're. It's really that simple.
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07-21-2006 01:39 PM  14 years ago
DS 8717

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I use mine dry like the instructions tell me. DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-21-2006 02:14 PM  14 years ago
shlm

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West Chester, PA

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Douglas,

What maneuver were you performing when you bent the spindle? I too have been running the the CX dampner and the V's. As a matter of fact I have tried to bend mine in flight. I've go full bore forward and pull full backward cyclic. I would think this puts some force on the spindle. I bog the heck out of the head to the point I have to wait for it to spool back up. I am very interested to know what you were going.
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07-21-2006 03:52 PM  14 years ago
DS 8717

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I dont know exactly what bent it, but try some tictocs. The only way i could tell it was bent was to remove it and roll it on a flat surface. the stock spindle is very soft,you bend it with your hands pretty easily. DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-21-2006 04:17 PM  14 years ago
shlm

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West Chester, PA

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How many times has this happen? Perhaps it is a fluke. I just grabbed on of my spindles and I can't bent it with my hands. Were did/does it bend the shaft, towards the ends or in the middle? Also what grip holes are you using, inter or outer?
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07-21-2006 05:24 PM  14 years ago
DS 8717

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It only happened once because i replaced it with a quick uk spindle. it bends right where it comes out of the dampeners.. Mine was not the only one that bent at our field. DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-21-2006 05:46 PM  14 years ago
shlm

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West Chester, PA

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What blade grip hole are you using?
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07-21-2006 06:24 PM  14 years ago
DS 8717

rrProfessor

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I'm using the stock head,now i'm using the Infinavation dampners. It was really hard to tell the spindle was bent just flying,i had to remove it to check it. I used the stock dampners first and shimmed them up a little before i went to the CX and Infinavation . It could have gotten bent with the stock dampners.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-21-2006 06:36 PM  14 years ago
Leif

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USA

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I've had both types of spindles bend from sloppy autos that did no other damage to the heli. This was with both the stock dampeners and CX using the standard plastic yoke.

I've also had them bend in flight, but I don't know what maneuver actually caused the damage. As Doug observed, you don't always know the spindle is bent unless you specifically look for it. I'll notice a bit more vibration than usual and on closer inspection find that the spindle is bent. They usually bend in the area of the dampener.

I do have a theory that you'll get more bending with the stock dampeners or CX dampeners that have developed some spindle slop. I don't have any hard data on this though.

Leif
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