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Next-D › Rave 450 tail bobbinig up and down
04-10-2010 05:36 AM  8 years agoPost 1
Jgatorman

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Birmingham, AL

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Rave 450 tail bobbinig up and down this is not due to low head speed but seemingly high head speed. It all started when I replaced my seasaw cage from a previous crash a while ago that I had to auto in inverted on the head. Replaced flybar cage at the time never realised I had managed to bend seasaw cage. I just noticed slop in the races for the bearings that attach to the head block. So after repacing seasaw cage I take her out for a test flight and upon spoolup in Idle 2 (scorpion 10, 13 tooth pinion 100% flat curve and fresh 4s blurr I notice that for the first minute or so of all 3 packs the tail was bobbing after a minute or so it would quit. The head speed initially according to my Icelite is 3400 rpm and then it falls off to about 3200. I conclude at this point it must have something to do with head speed but upon further inspection I notice bearings in motor are shot, lots of side play on motor shaft. So now I assume bad bearing equals wobbly shaft equals bobbing tail so I go home switch out to a scorpion 8, 12 tooth and go back to test fly she still has tail bob but only in idle 2 100% flat curve in idle 1, 90% flat curve no bobbing. Please remember that this is tail bobbing(verticle plane) not tail wagging (horizontal plane) Everything looks normal double checked boom and boom struts all good. Ps I also repaced the washout ball links which were a little snug so I slightly reamed and now they seem smooth.No slop in head at all(in case you were curious)

Anyone got a clue to where the bob is coming from? Please assist. I also set the icelite to govener mode and 3200 rpm to see if that will help. I will test fly first thing in the morning

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04-10-2010 05:56 AM  8 years agoPost 2
bigballajeff

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Omaha,NE-USA

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i know 2 guys that had the same issure ur havin.....one of em.....his dampners were bad....id check that out....u said u checked the head tho so it might rule that one out......

The second guy who had an up and down bobble on his rave actually had his gear mesh too tight....loosened that up and he was good to go....I dont know if this helps u at all but thats the 2 ways guys here fixed their problems wit their raves....I hope this helped....

Scorpion Motors

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04-10-2010 12:49 PM  8 years agoPost 3
Jgatorman

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Birmingham, AL

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Thanks I will check gear mesh as it is more likely for I swapped motors.

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04-10-2010 03:47 PM  8 years agoPost 4
Ironhide

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dexter mi us

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I had a 450 trex do the same thing . It was a bad bearing in one of the mixing arms . Hope this helps

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04-16-2010 04:41 PM  8 years agoPost 5
Jgatorman

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Birmingham, AL

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gear mesh thanks and fixed

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04-16-2010 04:57 PM  8 years agoPost 6
bigballajeff

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Omaha,NE-USA

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Good deal man! Just in time for the weekend!! Haha

Scorpion Motors

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04-16-2010 05:09 PM  8 years agoPost 7
Jgatorman

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Birmingham, AL

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Actually I was just late in responding. I flew her last weekend this weekend her and the vibe are road trippin with me to huntsville. We leave in an hour.

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04-16-2010 05:11 PM  8 years agoPost 8
bigballajeff

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Omaha,NE-USA

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lucky!!....wish i could go to that!! well enjoy ur weekend there man.

Scorpion Motors

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04-16-2010 05:12 PM  8 years agoPost 9
Jgatorman

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Birmingham, AL

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:

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