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Old Jan 18, 2013, 02:39 AM
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9116 Servo Behavior

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Old Jan 18, 2013, 02:43 AM
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Hahaha iv never heard of wooden magnetism but it seems to be a real problem :P
It does drift around in circles, this is called the pendulum effect right? But mostly to the back right. Im having some issues getting it trimmed
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Old Jan 18, 2013, 02:46 AM
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Quote:
Originally Posted by Steve_ View Post
The only action you should get from the servos without any cyclic
input is the servo on the battery port side will move down, when
you first apply throttle.

Then as you advance the throttle to 100%, it will slowly swing
upwards to the spot it was at zero throttle.

Then when you cut the throttle, it will quickly move down, and
then slowly creep back up.

I'm not sure what purpose this serves, and the mixing is done on the PCB,
otherwise it would show up on other helicopters.


It's possible that it is a glitch in the design of the PCB, but due to
the smooth action, it appears that it was actually programmed in.

If you are getting any other action than what I described, such as
the other servo on the tail motor side moving without cyclic input,
then something is wrong, and you either have a bad servo or PCB.
Ok, sounds like its doing what its supposed to.
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Old Jan 18, 2013, 02:52 AM
Ain't crashing often anymore
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Quote:
Originally Posted by Fathead View Post
Hahaha iv never heard of wooden magnetism but it seems to be a real problem :P
It does drift around in circles, this is called the pendulum effect right? But mostly to the back right. Im having some issues getting it trimmed
n. if it drifts around in circles AND the nose keeps pointing in the same direction - it is called TBE - Toilet Bowl Effect.
The reason mostly is some binding/friction in the rotor head - some screws to tight, washers installed, etc.
everything has to move freely - as less friction as possible - no excessive play, though.


If your bird keeps drifting in one direction - you wrote back right - AND keeping the heading then go back to start - check the COG - then reset all TX settings - and start levelling your swashplate after settting the pushrods to factory length.
-mike-
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Old Jan 18, 2013, 03:42 AM
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9116 Servos and EPA settings.

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Old Jan 18, 2013, 04:48 AM
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Laidback_racer's Avatar
Australia, VIC, Berwick
Joined Jan 2013
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The stock servo's are crap in my experience with both of them failing after minor initial crashes. There are many youtube vids showing this along with 9116 user comments on rcgroups and elsewhere. I notice Steve is not running stock servo's, but that could be for another reason.
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Old Jan 18, 2013, 04:49 AM
Just a 9116 flyer.
Rajah235's Avatar
Australia, NSW, Wollongong
Joined Dec 2012
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The forum has been busy since I turned in last night. Was only at page 50.

Interesting reading.
Anyway...
Steve wrote.
Quote:
A smaller pinion gear would be the normal solution, but due to the shaft diameter
and gear pitch I doubt we can go any smaller.

Since the motor mounts in a recessed "well", it would require clever modifications
to get the gear mesh spot-on, so I'm fairly certain that we are stuck with the
stock 8 tooth pinion.

I doubt they even make a 7 tooth pinion in that pitch and shaft size.
Steve et al,
The smallest pinion gear that could be used on our slots, was a 6 tooth. (Not recommended due to the 60 Deg angle of the teeth.
We found that a 7 tooth was fine but, most ran either a 8, 9 or 10 tooth.
The pitch on these gears is pretty much a "standard", as they mate with the main gear, no prob.

& as I mentioned, it looks like the Super 16D will fit nicely, just rotated by 90 Degs.
When it arrives I intend to run an 8 tooth on it.

I haven't lightened it as yet, so will see how it goes. (When I get to actually flying it.)

Mike wrote...
Quote:
It is called "wooden magnetism" and affects RC helis and quads.
I fully agree Mike, with a few additional items.
Mine seems to like aluminium, steel, dirt, gravel & anything green as well.

------------------------------------------------------------------------------------------------------------------
We just experienced 45 ℃ today & at present, (9.45 PM) it's down to a more pleasant 26.
Big Southerly blowing through at 60 to 80 kph.
------------------------------------------------------------------------------------------------------------------
Still waiting for a few more bits to arrive, before proceeding with the motor mods etc etc.
L..
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Old Jan 18, 2013, 04:52 AM
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Old Jan 18, 2013, 05:07 AM
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Quote:
Originally Posted by Steve_ View Post
I guess Mike and I have just had good luck with the stock servos.

I agree that they are crap, but if they are properly adjusted, they seem
to hold up fairly well.

What I hate about them is their massive amount of play and backlash in the
gear assembly, and their inability to hold position because of it.

This is what makes the 9116 so hard to trim out.

Just replacing one of the servos with a quality unit made a noticeable difference
in control, and I plan on replacing the other as well when more money comes along.
I wouldn't be surprised if it was the major Achilles heal of the 9116. Some might be lucky.
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Old Jan 18, 2013, 05:32 AM
Just a 9116 flyer.
Rajah235's Avatar
Australia, NSW, Wollongong
Joined Dec 2012
618 Posts
Just replace both with the Turnigy 1440A's.
The arm is stronger & the output shaft has much less play & the gear train is better.
Add the DUBRO #929, .047, ball & socket mod & you've got better control for about $6.50 odd per side.
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Old Jan 18, 2013, 05:52 AM
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Quote:
Originally Posted by Rajah235 View Post
Just replace both with the Turnigy 1440A's.
The arm is stronger & the output shaft has much less play & the gear train is better.
Add the ball & socket mod & you've got better control for about $6.50 odd.
Sometimes supply outstrips demand. My searches recently could only achieve $18.00 US for the twin Turnigy. The ball and socket mod is extra.
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Old Jan 18, 2013, 05:57 AM
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Old Jan 18, 2013, 06:06 AM
Just a 9116 flyer.
Rajah235's Avatar
Australia, NSW, Wollongong
Joined Dec 2012
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I bought the servos from HK for $3.39 US & the ball sockets (2 in pack) from Dubro for $3.99 US.
Cheap as...with the Aussie conversion rates.
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Old Jan 18, 2013, 06:10 AM
Build the Weapon....
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Quote:
Originally Posted by Rajah235 View Post
I bought the servos from HK for $3.39 US & the ball sockets (2 in pack) from Dubro for $3.99 US.
Cheap as...with the Aussie conversion rates.
I have seen those prices in the past. Harder to get today.
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Old Jan 18, 2013, 06:23 AM
Just a 9116 flyer.
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Australia, NSW, Wollongong
Joined Dec 2012
618 Posts
I just checked at both suppliers.
> http://www.hobbyking.com/hobbyking/s...ervo_0_5g.html
> http://shop.dubro.com/p/micro-ball-link-for-047

Of course, you have to add a little shipping but they're still cheap compared to the Aussie (If avail.) prices.

[edit]
From HK, Australia...
> http://www.hobbyking.com/hobbyking/s...ervo_0_5g.html

For the Dubro ball sockets, try your local hobby shop.

Oh yes. & don't forget to buy the 1 mm x 300 mm long brass rod for the new push rod.
(You can't solder stainless steel.)
Ref; my mods pics in my blog.
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