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HelicopterNext D Rave-ENV-700 › "Low" headspeed wobble
04-04-2011 07:53 PM  6 years agoPost 1
ssmith512

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Indianapolis, IN USA

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Ok, since my Rave ENV was new it has had a pretty bad side to side wobble at "lower head speeds". This wobble will go away when I flip into Idle 1. I actually had to up my head speed quite a bit in Normal mode to get the wobble to go away. I see some guys are able to run quite low head speeds and with mine this simply isnt the case, so I am looking for reasons as to why my model shakes and what I can do to fix it. Anything below 1780 head speed and I get the wobble. So, I am running 1790 in Normal mode (1875 in Idle 1) to prevent the wobble , I would like to run 1650 or so in Normal mode, but am not able to due to the wobble.

Heli is box stock. I am using the stock dampers, unmodified, glued into the head per the manual (used a little CA to glue the dampers in). I did not lube dampers (only used some Windex to help facilitate installation of the spindle shaft.) I have about 2 gallons on the airframe. Radix 710FBL blades and I run the blades fairly tight in the main grips.

Any help on what to look for or try is greatly appreciated, as I am still ignorant on the workings of a head and damper system. Thanks in advance.

Steve

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04-04-2011 10:25 PM  6 years agoPost 2
Buzzin Brian

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College Station,​Texas

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The likely cause of your problem is the head being way to tight. Was the spindle a little difficult to get through the head with the dampers in it?

Brian

Build it, fly it, crash it. Repeat as often as needed.

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04-04-2011 10:41 PM  6 years agoPost 3
rcnut

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Rockford, Illinois

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Radix 710FBL blades and I run the blades fairly tight in the main grips.
Your blade grips might be too tight. I had the same problem with my Aurora.

Just a thought.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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04-04-2011 10:50 PM  6 years agoPost 4
ssmith512

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Indianapolis, IN USA

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The likely cause of your problem is the head being way to tight. Was the spindle a little difficult to get through the head with the dampers in it?
The spindle was indeed difficult to get through the head, but certainly not impossible and it wasnt so tight that I felt I needed to try to stop and investigate why it was so tight. But I have only built 3 helicopters total, so I am not sure I would know what "too tight" is necessarily. Possible solutions?
Your blade grips might be too tight. I had the same problem with my Aurora.

Just a thought.
I will experiment with loosing them up a little bit at a time.

Thanks for the help so far!

Steve

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04-05-2011 01:29 AM  6 years agoPost 5
Buzzin Brian

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College Station,​Texas

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Do not loosen the blade grips! The model will explode! For now I suggest getting a few flights on the Heli. You will find they will wear in pretty quickly. If they do not we will go from there. It is the dampers, not the blade grips themselves.

Brian

Build it, fly it, crash it. Repeat as often as needed.

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04-05-2011 01:33 AM  6 years agoPost 6
ssmith512

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Indianapolis, IN USA

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Do not loosen the blade grips! The model will explode!
That would be bad LOL!!

Ya, airframe barely has 2 gallons on it. I will get some more flight time as soon as Mother Nature allows me to. Hopefully the model will smooth out pretty quickly. Thanks for the help Brian!

Steve

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04-05-2011 01:43 AM  6 years agoPost 7
Supercoolheli

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Stillwater, Oklahoma

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I have noticed a similar bounce on mine too. I'm going to sand a tiny bit off the outside of the dampers to loosen it up in the head, because it is very tight right now. Maybe that would work for you as well. Hopefully you get it worked out soon!

Eric Olson:
Team SAB USA
Team Pulse Ultra

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04-05-2011 02:47 AM  6 years agoPost 8
Sky Dancer

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Bryan, Texas

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I agree with Brian....

Your head damping is probably too tight. The stock dampers fit quite tight and are good for 3D and high head speeds (>1850).

If you want to run lower head speeds here's a couple of suggestions:

To loosen up the dampers, just slip the dampers over the spindle and chuck the spindle up in a drill press. Spin them up and sand with a large emory board (or anything flat) until the dampers will slip into the head block fairly easily (not loose). Then reinstall the dampers and don't glue them in! You will loose the wobble except at very slow head speeds but they might wear out a little faster.

Some of the FAI guys are slicing off the outer surfaces of the dampers until the end view looks like a hexagon. It's all preference for what works for you.

Have fun....

Don C

Keep up your rotor speed !

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04-05-2011 02:59 PM  6 years agoPost 9
ssmith512

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Indianapolis, IN USA

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Thanks a ton for the help and education! I do appreciate it!

If I leave it as is and decide to run the higher head speed to keep it out of the "wobble zone", will it hurt anything having the head that tight? I am guessing I would loose a tad bit of hover stability but gain a little agility, and a tight head will probably help prevent boom strikes in hard aggressive manuevers?

Steve

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04-05-2011 03:42 PM  6 years agoPost 10
Sky Dancer

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Bryan, Texas

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Hi Steve,

It's fine to leave the head dampers tight and run a higher head speed.

Boom strikes are not a problem at all with the ENV, even with the dampers a little looser.

Don C

Keep up your rotor speed !

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04-05-2011 10:47 PM  6 years agoPost 11
Supercoolheli

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Stillwater, Oklahoma

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I run 2080 headspeed on my electric with the tight head and i get a mean bounce. But I'm going to try fixing it via the Total-G before messing with the head, just to rule that out if needed.

Eric Olson:
Team SAB USA
Team Pulse Ultra

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04-06-2011 12:01 AM  6 years agoPost 12
Buzzin Brian

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College Station,​Texas

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Curtis recently posted a Radix Facts video showing how to flight tune the Total-G. You can find it on our site in the gallery.

Brian

Build it, fly it, crash it. Repeat as often as needed.

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04-06-2011 12:03 AM  6 years agoPost 13
Supercoolheli

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Stillwater, Oklahoma

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Yeah that really helped and I'm going to try the response matching. It doesn't include anything about damper tightness but I think that the matching will help mine a lot at least.

Eric Olson:
Team SAB USA
Team Pulse Ultra

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04-06-2011 12:35 AM  6 years agoPost 14
ssmith512

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Indianapolis, IN USA

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A little off topic here, but I gotta give major props to the CYE team for taking the time to produce the Radix Facts episodes. That last one is simply awesome. It takes the "science" out of tuning and puts it simple laymans terms that should be easy for anyone to understand and follow and allow them to get their model flying perfectly.

Steve

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