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Thunder Tiger
Raptor E620 › bounce and wag
01-17-2009 01:29 AM  9 years agoPost 1
tequilabey

rrNovice

maple valley, wa

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I have an E600. After a crash in Nov, I also installed an SK360. I've been struggling with it since then to get back to a machine that handles as well as it did when I first got it.
The 2 biggest problems are the bounce and the tail twitch.
I'm a rank beginner, so i rarely let it more than 2-3' up, mostly fly within inches of the deck. I can fairly easily bring it to an altitude that I like, say 3", and for a short while it'll stay there, but then frequently after a few seconds, it'll start bouncing up and down - as if either there were power surges or as if someone was playing a little w/ the collective. It will go up 6-12", and then back down about 1 bounce per second, and will keep this up until I land it.
In addition to this, the tail will twitch - I've never seen the "wag" that's discussed, but this is a very definite twitch to one side or the other - never back and forth. It'll go about 6" clockwise, then back maybee 1/2", then another 3-4" CW, then back a little, it'll do several of these twitches in one direction and stop. then start over,sometimes going in the same direction as before, sometimes the other direction.
I'm going to reinstall the flybar to rule out the SK360 (I dont really think the SK360 is the problem, but it's the biggest change I made).
Does anyone have any thoughts about power surges - i'm using a 75A ESC from ACE, and a separate BEC from Castle. The HH gyro is a futaba 401. I believe the tail mechanical setup is correct.
What about shielded control wires?

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01-17-2009 11:45 AM  9 years agoPost 2
Ben-T-Spindle

rrProfessor

Central Illinois

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Flybarless for a beginner?
What flybarless head do you have?

If you have modified the stock head it must be done correctly to get satisfactory results. Some photos would help.

... BTS

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01-17-2009 06:29 PM  9 years agoPost 3
tequilabey

rrNovice

maple valley, wa

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Its an SK360
I've emailed some w/ Skookum, who werent really able to help.
I'm pretty pleased with the installation; used all existing parts, but had to buy an extra mast collar (to hold the washout up), and since I was also switching to the 140 swash, I had to manufacture 2 new linkages.
These pictures pretty much capture the setup.

I flipped the washout slider upside down, which allowed me to reverse the action of the washout mechanism and more or less divide the swash movement by 2 or so.

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01-27-2009 01:26 PM  9 years agoPost 4
Helos4Me

rrNovice

San Diego, CA. USA

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Could be an electronic problem but first make sure the mechanical is setup is good and clean. I had some tail twitch and mini surges a while back and I cleaned out the autorotation one way bearing, relubed it and things were fine. Depending on your gyro subtrim can foul things up also but if it's bouncing up and down you definitely have signal or power problems, check batt, location of reciever to motors and if it's a belt drive maybe static buildup depending on weather. I just put in an SK360 and the thing flys like it's on rails! I'm a nitro guy so I can't help too much on the E side of things.

To Fly Is Heavenly, To Hover Divine!

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01-27-2009 05:50 PM  9 years agoPost 5
tequilabey

rrNovice

maple valley, wa

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Thanx for the thoughts.
I'm waiting for parts so I can swap out the sk360, and I'll take the opportunity to first really go through the mechanical, and secondly to reassess the layout of the electronics.

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