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Old Oct 20, 2009, 12:46 PM
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wcc963's Avatar
United States, FL, Pompano Beach
Joined May 2006
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Quote:
Originally Posted by hpapilot
By blowback I mean the servo does not have enough torque to push the ailerons to full deflection against the air pressure at flying speeds. I am using Futaba S3114's or S3154's all around on my airplanes. Both have about 23 oz of torque, but the 3154 is digital so a little more expensive.
im using 3114's on my charger rc axilion... they're bigger than that JR's. whats your AUW?
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Old Oct 20, 2009, 01:00 PM
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3D-Seth's Avatar
Champaign, IL
Joined Jan 2007
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Quote:
Originally Posted by wcc963
im using 3114's on my charger rc axilion... they're bigger than that JR's. whats your AUW?
My MX2 from ETOC with the VPP stuff and 3 cell battery was just under 6oz. I think they're coming in around 5.25oz with no VPP system, and on 2cells.

Seth
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Old Oct 20, 2009, 01:32 PM
Oly crap.. Deese ease not gud!
hpapilot's Avatar
USA, NC, Kernersville
Joined Nov 2006
1,160 Posts
Quote:
Originally Posted by wcc963
im using 3114's on my charger rc axilion... they're bigger than that JR's. whats your AUW?
The servo cutouts in the MX2 are perfectly sized for the S3114's, which are only very slightly larger than the S185. As Seth and Dave said, if you want to go with S185's, I would suggest two of them.

I need to weigh the new plane, but I'm guessing it's right around 5 ounces. Whatever it is seems perfect... the printed kit with stock setup is at a really good weight for a balance of inertia for 3D and floatiness for slow stuff.

RJ
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Old Oct 20, 2009, 01:56 PM
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eli5539's Avatar
Western New York
Joined Dec 2007
1,099 Posts
Have you folks come up with a firm date on when we will be able to get our hands on this bird?
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Old Oct 20, 2009, 02:41 PM
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south central kansas
Joined Jul 2003
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Quote:
Originally Posted by eli5539
Have you folks come up with a firm date on when we will be able to get our hands on this bird?

Should be this weekend.

Mike
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Old Oct 20, 2009, 02:50 PM
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United States, FL, Pompano Beach
Joined May 2006
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Quote:
Originally Posted by 3D-Seth
I would recommend two 185s per aileron. 1 185 really isn't quite enough because of the blowback they get on those large ailerons.

Seth
is that what is happening with my FF yak-55? i have one spektrum DSP60 on there and it will freak out and ocilate very rapidly at random?
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Old Oct 20, 2009, 02:50 PM
Oly crap.. Deese ease not gud!
hpapilot's Avatar
USA, NC, Kernersville
Joined Nov 2006
1,160 Posts
Quote:
Originally Posted by wcc963
is that what is happening with my FF yak-55? i have one spektrum DSP60 on there and it will freak out and ocilate very rapidly at random?
Nah... that's pretty typical of those servos. Blowback just means the plane won't roll as fast as it should.
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Old Oct 20, 2009, 03:23 PM
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United States, FL, Pompano Beach
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Quote:
Originally Posted by hpapilot
Nah... that's pretty typical of those servos. Blowback just means the plane won't roll as fast as it should.
ok, its just weird. only the ailerons do it. the rudder and elevator are fine, would it help to put two servos on the ailerons?
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Old Oct 20, 2009, 03:37 PM
Team JR
Medford, NJ
Joined Jan 2004
317 Posts
WCC,

2 servos will likely help. Changing to a different type of servo will also likely help.

The oscillation is generally caused by two things -
1. the natural frequency of the servo matches up to a resonance in the control surface (or surfaces for ailerons)
2. the pot on the servo is getting worn, and it is "hunting" trying to stay perfectly centered.

A combination of 1 and 2 can lead to pretty nasty oscillations.

Even a brand new servo can have an oscillation issue if it happens to be in resonance with the control surface.

What helps -
- more expensive servos (in most cases, try a JR 185 or 188)
- lighter control surfaces (this has a big effect on the DSP60s)
- no slop/flex in linkages

Regards,

Dave Lockhart
Team Horizon/JR/Spektrum



Quote:
Originally Posted by wcc963
ok, its just weird. only the ailerons do it. the rudder and elevator are fine, would it help to put two servos on the ailerons?
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Old Oct 20, 2009, 03:41 PM
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wcc963's Avatar
United States, FL, Pompano Beach
Joined May 2006
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Quote:
Originally Posted by DaveL322
WCC,

2 servos will likely help. Changing to a different type of servo will also likely help.

The oscillation is generally caused by two things -
1. the natural frequency of the servo matches up to a resonance in the control surface (or surfaces for ailerons)
2. the pot on the servo is getting worn, and it is "hunting" trying to stay perfectly centered.

A combination of 1 and 2 can lead to pretty nasty oscillations.

Even a brand new servo can have an oscillation issue if it happens to be in resonance with the control surface.

What helps -
- more expensive servos (in most cases, try a JR 185 or 188)
- lighter control surfaces (this has a big effect on the DSP60s)
- no slop/flex in linkages

Regards,

Dave Lockhart
Team Horizon/JR/Spektrum
thanks,

since my axilion had its nose ripped of i'll probably just drop a 3114 in for the ailerons
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Old Oct 20, 2009, 07:33 PM
when i say gas i mean gasoline
louu's Avatar
NJ
Joined Apr 2008
81 Posts
will a jr285 be too much for the ailerons?
will a jeti 8a speed controller be good for the Hacker A10-9L

hey dave are you going to pitman on thursday or mt laurel tommorow?
imm goin thursday, gotta warch the phillies tommorow.
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Old Oct 20, 2009, 07:46 PM
Oly crap.. Deese ease not gud!
hpapilot's Avatar
USA, NC, Kernersville
Joined Nov 2006
1,160 Posts
Louu, from the specs, the 285 looks okay for the ailerons. It looks a bit heavier but should be enough torque. I haven't used a Jeti 8 on the 9L, but it should also work just fine, 8 amps is plenty.
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Old Oct 20, 2009, 08:39 PM
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eli5539's Avatar
Western New York
Joined Dec 2007
1,099 Posts
Quote:
Originally Posted by DaveL322
WCC,

2 servos will likely help. Changing to a different type of servo will also likely help.

The oscillation is generally caused by two things -
1. the natural frequency of the servo matches up to a resonance in the control surface (or surfaces for ailerons)
2. the pot on the servo is getting worn, and it is "hunting" trying to stay perfectly centered.

A combination of 1 and 2 can lead to pretty nasty oscillations.

Even a brand new servo can have an oscillation issue if it happens to be in resonance with the control surface.

What helps -
- more expensive servos (in most cases, try a JR 185 or 188)
- lighter control surfaces (this has a big effect on the DSP60s)
- no slop/flex in linkages

Regards,

Dave Lockhart
Team Horizon/JR/Spektrum
Okay Dave,
I ran the DSP60 servo's with the AR6300 receiver on the Osiris and did not seem to have a problem. I like them because they are light weight and digital. From what you have posted you are saying that I should use the JR 185 or 188, is that correct. If so will the JR's plug into the AR6300

Thanks for the input
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Old Oct 20, 2009, 09:19 PM
Team JR
Medford, NJ
Joined Jan 2004
317 Posts
Eli,

If you aren't having problems with the DSP60s, keep running them. I run them on a variety of planes, and they are usually fine, it is just that the 188 is better (as it should be since it costs more). The 185 is a very high quality non digital servo, and from my experience is less likely to oscillate than the DSP60s.

The 185s and 188s have a standard JR style plug and won't fit the AR6300 (micro JST) without an adapter. The 185/188s work with the 6110 and 6100 RXs.

Now...back to the MX2.

Dave

Quote:
Originally Posted by eli5539
Okay Dave,
I ran the DSP60 servo's with the AR6300 receiver on the Osiris and did not seem to have a problem. I like them because they are light weight and digital. From what you have posted you are saying that I should use the JR 185 or 188, is that correct. If so will the JR's plug into the AR6300

Thanks for the input
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Old Oct 20, 2009, 09:21 PM
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3D-Seth's Avatar
Champaign, IL
Joined Jan 2007
667 Posts
Quote:
Originally Posted by DaveL322
Eli,

If you aren't having problems with the DSP60s, keep running them. I run them on a variety of planes, and they are usually fine, it is just that the 188 is better (as it should be since it costs more). The 185 is a very high quality non digital servo, and from my experience is less likely to oscillate than the DSP60s.

The 185s and 188s have a standard JR style plug and won't fit the AR6300 (micro JST) without an adapter. The 185/188s work with the 6110 and 6100 RXs.

Now...back to the MX2.

Dave
Although they don't fit without an adapter, you can also cut the lead, and solder the little white JST plugs onto them (however, I'm sure this voids the warranty).
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