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Home✈️Aircraft🚁HelicopterHIROBOOther › Small Problem with a Evo 50
07-31-2007 01:08 PM  13 years ago
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Viperman

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Dallas, Texas

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Small Problem with a Evo 50
Hey, I have a question far ya.

I have an evo 50 with a hyper, 600 tt carbon blades and the rest is stock. I was flying last Saturday for about five to ten minutes and I was doing some figure eights and forward flight. All of the sudden the mains started flapping like a bird (up to at least four inches). So I landed very quickly and check everything out and the feathering shaft was bent badly. So I took it home and replaced the shaft and checked the main shaft, blade balance and everything that I could think of. Everything looked ok so I loaded up the next day to fly and fired it back up to check blade tracking and it was off about a one degree. So I adjusted and everything was great. Machine was rock solid until about ¼ tank and the same thing again. I landed and checked machine for any play and found nothing. So I fired it back up and hovered. It flew fine so I landed because I didn’t want to damage the heli and flew planes the rest of the morning.

What should I check for this problem?
I am going to replace the main shaft and bearings first.

Thanks for any help with the problem,
V

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07-31-2007 01:25 PM  13 years ago
Quickster

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Victoria, Australia

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Might pay to check your rubber dampers havent ovaled out.
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07-31-2007 02:13 PM  13 years ago
Leif

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USA

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I agree. If you are running the stock dampers it's time to change them. This would also be a good time to evaluate whether harder after-market dampers are a better fit for your flying style. I like the CarbonExtreme micro-ridge dampers, but the ones from Infinivation are also reported to be pretty good.

This effect shows up at higher RPMs. You're seeing it at 1/4 tank because your engine is leaning out and the headspeed is increasing due to the change in engine tuning.

Leif
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07-31-2007 02:32 PM  13 years ago
Viperman

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Dallas, Texas

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Thanks everyone.

I wouldn't have thought of the dampers being the problem.

Leif you are spot on. I just increased my head speed that first morning.

I knew this was the place to go. I should of posted after the first day.

Thanks Again,

V
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07-31-2007 03:11 PM  13 years ago
BarracudaHockey

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Jacksonville FL

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The other thing is check the thrust bearing installation.Andy
AMA 77227
http://www.jaxrc.com
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07-31-2007 08:23 PM  13 years ago
Havoc

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Ky.

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A bad collective servo will do this also.
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08-01-2007 06:36 PM  13 years ago
Viperman

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Dallas, Texas

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I just ordered the Infinivation dampners from heliProz and will be here friday. I will let ya'll know how it goes this weekend.

Thanks for all the help guys.

V
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08-02-2007 12:58 AM  13 years ago
himaxkeith

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Atlantic City NJ. USA

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after you make your repairs and you still have a problem recheck your blades for balance on rare occasions the lead weight inside of one of your blades may have slided out inside one of your blades only way to tell if it happened is to remove the blades find where each blade balances mark the center if there a big difference in cg the blade that balances closer to the tip is uasually the suspect blade stand it on end and tap it on a table and recheck if the cg moved back close to the other blade you know what the problem is its rare but it happens just from normal use from the blades flexing breaks the glue holding the weight inside one of the blades sometimes you can remove the blades and shake them if it sounds like a baby rattle might want to check it too. good luck let us know how you made out
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08-06-2007 12:41 AM  13 years ago
himaxkeith

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Atlantic City NJ. USA

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any updates ?
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08-26-2007 12:50 PM  13 years ago
Viperman

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Dallas, Texas

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I have replaced the dampers, main shaft, feathering shaft and tried different blades from woodies to carbons to no avail. It was better but not gone. This was driving me crazy. So I put the heli up for a couple of weeks and took a short break from RC.
Ok it’s been driving me crazy so I removed the engine yesterday to check bearings, compression, cleaned and I go over machine with a fine tooth comb. I just couldn’t see anything wrong with the frame so I put the engine back in adjusted a few things and the problem just jumped at me. I feel like a dumb a_ it was the servo tray. It had a small crack and loose screws and in my head. Replaced tray and ca glued all screws, adjusted everything and all is great again. I will mark this one as a very good learning experience.

Thanks to all for helping out,

V
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08-26-2007 01:13 PM  13 years ago
hootowl

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Garnet Valley, Pa.

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CHECK THE FOUR SCREWS THE HOLD THE PLASTIC HEAD TO THE METAL HUB!

Ooops just read your last post completely. The problem was the screws in the had block most likely. They need plenty of locktite or they come loose easily.
Wolves don't lose sleep over the opinions of sheep
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08-26-2007 01:53 PM  13 years ago
Shiro Muji

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Japan

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try to check the seesaw if there was no hairline crack and also the stabilizer control arm if the screws connecting both the arms are well tighten.
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08-27-2007 03:20 PM  13 years ago
funflyer2006

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CC, Iowa

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How are you liking the Infinivation dampeners?I LOVE MY EVO!!!
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09-03-2007 12:44 PM  13 years ago
Viperman

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Dallas, Texas

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The new Infinivation dampners are nice. My machine is more responsive than ever. It’s almost like a new heli again.

V
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09-14-2007 06:52 PM  13 years ago
JR-ric

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newport news VA

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if u dont replace the stock dampers you will end up haveing a blade strike as I have......CX and the other IME something has good dampers....thats if u plan on doing some 3d....it was a big mistake not replaceing the dampers when I was doing 3d.....I learned the hard way.....but replaceing the damper will most likely solve that problemRicardo Maldonado
Team Curtis Youngblood Enterprise
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09-16-2007 01:08 PM  13 years ago
Viperman

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Dallas, Texas

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Update

No problems so far.

Thanks for all the help guys,

V
Everybody Doing It!
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