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› Toilet bowl effect
03-31-2009 07:01 PM  9 years agoPost 1
Melnic

rrElite Veteran

Columbia, MD,USA

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I have an EXI 450 that was once in a crash.
I don't know if it had the problem before but when my RPMs are low (2400 or lower) the helicopter wobbles like a toilet bowl flush.
It is fine when my RPMS are higher during normal flight.
I'm concered becuse I took this out of a scale fuse that when my rpms dropped, the helicopter shook so hard that the fuse mounts were cracking.

What should I look for?

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03-31-2009 07:15 PM  9 years agoPost 2
what_the_helli

rrKey Veteran

cookeville, tn USA

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try replacing your head dampeners to start with

another trick is to pull the whole head with the main shaft attached and chuck it up in a hand drill. take the blades off and then spin up then head, if anything is bent or wobbly you can see and feel it... I have used this method more than once

I put the fun in dysFUNctional :)
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04-04-2009 05:49 PM  9 years agoPost 3
Melnic

rrElite Veteran

Columbia, MD,USA

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I spun up the helicopter in the basement to verify I could reproduce the problem before doing changes. I could not do it easily. The only way I could was to get the head speed REALLY low, like sub 2000RPM then give it quick cyclic movement then it would wobble to a stop.
I'll try to do the drill test.

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04-05-2009 01:15 AM  9 years agoPost 4
Isaac F

rrKey Veteran

Panama Republic of Panama

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try replacing your head dampeners to start with
Make SHURE you lube/Oil the rubber head dampers. When you going to install them in the head, put oil on the outside of the rubbers in order that they get in full and not deformed. The oil help on this.

Then put oil in the inner part of the rubber dampers were the spindle slides in. Make shure that you can move the spindle from side to side easy with the oil.

Some people says to use only silicon based oil and not mineral oil in order that it does not damage the rubbers. In my case I has always use 3 in 1 oil with no plroblem.

Good luck,

Isaac

Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak

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04-05-2009 03:54 AM  9 years agoPost 5
Melnic

rrElite Veteran

Columbia, MD,USA

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I use a synthetic lube called "super lube" that has teflon from Harbor Freight on the Spindle and dampers. I don't recall if I started doing that when I put that head back together after a crash. I spun up a spare head (CopterX) tonight. The head button was off center so I removed it. Everything else seemed ok. I'll add the flybar next then put that head on so I can play w/ the original one.

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