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HelicopterHIROBOOther › Evo Wobbles
06-07-2004 05:37 AM  13 years agoPost 1
Parsifal

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Singapore

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My Evo is flying fine except for slight pitchiness in fast forward flight and wobbles as the headspeed drops slightly through manouvers like flips, stationary rolls and at the end of autos.

Lubing the dampers is kinda useless as it simply ejects most of it after a few flights. Is it simply a case of headspeed? i am running 1950 so its fine for the most part, its only when the head gets loaded a little during a flip for example that the heli wobbles inverted for about a second or two. What about paddle choice or slop in the system? are there areas that i am missing that could result in a wobbling helicopter?

Pars

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06-07-2004 05:44 AM  13 years agoPost 2
mrNoodles

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Borlänge, Sweden

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What blades are you using?

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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06-07-2004 06:59 AM  13 years agoPost 3
Parsifal

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Singapore

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NHP Razor blades in CNC grips.

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06-08-2004 06:35 PM  13 years agoPost 4
damaen

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Umeå, Sweden

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Maybe you have have tightened the blades too much.

Henrik

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06-09-2004 02:50 AM  13 years agoPost 5
Parsifal

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Singapore

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No.. have tried loosening them up and its still the same... My problem is that i don't know if its normal to have a little wobble when the headspeed drops a little with the EVO. Is it?

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06-09-2004 12:01 PM  13 years agoPost 6
robve

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Rimforsa, Sweden

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My EVO is brand new and I have run only two gallons through it. At 1850 RPM it has lately developed a wobble and a "wah wah" sound that resonates with the wobble. It is slightly there in normal mode (1650 RPM) but much worse at 1850 RPM.

I have checked everything, there is no slop (changed to Hirobo metal washout) and the blades are not tightened exessive. Today, when I checked again, I noticed that I could waggle back and forth the the paddles a few degrees on the flybar (they are tightened with set screws, I used cyano as per instructions). Could this be the cause of the waggle?

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06-09-2004 12:04 PM  13 years agoPost 7
mrNoodles

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Borlänge, Sweden

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Do the paddles moves on the flybar??
Or is it the whole flybar assenbly that moves due to some play in the washoutarms/bearings?

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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06-09-2004 12:11 PM  13 years agoPost 8
MJA

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UK

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It is probably wobbling through manouvres because the dampers have gone too soft.I have only flown about 20 tanks through my Evo and the dampers are knackered already.You can get fuselage wobble with dampers that are too hard OR too soft at lower rpm,so it could be that.


Martin

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06-09-2004 12:33 PM  13 years agoPost 9
Garry-Boy

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Moscow, Russia

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Could this be the cause of the waggle?
Yes, that could be that!
Try to sort it out with paddles at first.

Garry.

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06-09-2004 12:35 PM  13 years agoPost 10
robve

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Rimforsa, Sweden

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Mr. Noodles: Yes, the paddles move on the flybar (one degree each direction).
It is not the flybar assembly that moves. I have no play in the washout arms/bearings. What I will do is to take a new flybar and use blue Loctite on the flybar threads (the threads on the old flybar are scored of the set screws).

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06-09-2004 02:16 PM  13 years agoPost 11
mrNoodles

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Borlänge, Sweden

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Robert
You can try rotating the flybar 90degress, might work, those setscrews make some ugly marks, which most often result in the paddles twisting back to the old position after they are freshly adjusted .
But rotating the flybar 90* might work...

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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06-09-2004 03:47 PM  13 years agoPost 12
robve

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Rimforsa, Sweden

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mrNoodles,

Thank you for the advice , now I understand why the paddles were loose. Hirobo's solution is overambitious but not so perfect, I prefer when the flybar is treaded directly into the plastic of the paddles.

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HelicopterHIROBOOther › Evo Wobbles
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