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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › I just found out my servos suck!
01-17-2010 10:20 PM  8 years agoPost 1
husafreak

rrKey Veteran

Livermore, NorCal

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Rebuilding an old Trex600E from when they first came out, mostly replacing bearings etc. I decided to transfer the model to my new JR9303 radio. I now have all the cool gear for heli setup, Trueblood swash leveler, etc. So my servos are Hitec HB6975HB. The centering is terrible on these things! Endpoints, midstick, everything varies by a full degree depending on which direction the servos are moving when they stop. I'm disgusted. I just did the same to my Trex600N which has Futaba S9451 servos and they were extremely accurate. Ah well, I didn't notice it too much when I was flying, just make corrections as necessary but now I'm really thinking of replacing those servos with something better, but still economical...

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01-17-2010 11:44 PM  8 years agoPost 2
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Hitec has some new 7000 series titanium gear servos which run on a 2S lipo. They look promising and are much cheaper than comparable JR or Futaba servos.

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01-17-2010 11:47 PM  8 years agoPost 3
husafreak

rrKey Veteran

Livermore, NorCal

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Really I'm surprised, I though the Hitecs would hold up better, I have a lot of their servo's I just never measured them.

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01-18-2010 12:01 AM  8 years agoPost 4
smallplanes

rrElite Veteran

S.C. ,SSA

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Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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01-18-2010 12:09 AM  8 years agoPost 5
Ghostrider

rrElite Veteran

San Diego, CA

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I have been running the Align 610's on one of my 700's and I like them alot! Not so great on the bench but in the air, they rock. $190 for all three at ReadyHeli.

http://www.readyheli.com/Combo_of_3...10425acombo.htm

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01-18-2010 04:38 AM  8 years agoPost 6
husafreak

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Livermore, NorCal

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Man, when you say "not so good on the bench" do you mean they center and position poorly like the Hitecs?

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01-18-2010 04:44 AM  8 years agoPost 7
Ghostrider

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San Diego, CA

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No not at all. They are kind of notchy. But they fly and feel great in the air!

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01-18-2010 06:03 AM  8 years agoPost 8
husafreak

rrKey Veteran

Livermore, NorCal

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Thanks, I just bought another set of Futaba S9452 servos on the bay, I have the S9451's in my Trex600N and they are dead accurate so I'll stick with them, only cost about 20 bucks more for 3 so.... I do have a NIB 610 for the throttle servo on my Srimok though, got nothing against them..

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01-18-2010 11:46 AM  8 years agoPost 9
jsenicka

rrProfessor

Eagle River, WI

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you must use the servo programmer on the Hitec servos out of the box and reduce dead band to minimum value. Otherwise they do not center properly for heli use.

Jim Senicka
Team Manager, GrandRC Flight Team

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01-18-2010 01:57 PM  8 years agoPost 10
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I've never heard anyone say that the Hitec servo programmer was necessary, but you have had success resetting the deadband? If the servo programmer wasn't so expensive, I might like to try the same.

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01-19-2010 04:38 PM  8 years agoPost 11
husafreak

rrKey Veteran

Livermore, NorCal

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Well, I have their servo programmer and I used the reset function in an attempt to get better results before starting this thread , no joy, but I did not reduce the deadband, I will try that when I go for the swap and report back. Note that these servos have flown quite a bit.

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01-19-2010 05:50 PM  8 years agoPost 12
jsenicka

rrProfessor

Eagle River, WI

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Changing deadband to 0 or 1 helped a bunch.
I borrowed the programmer

Jim Senicka
Team Manager, GrandRC Flight Team

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01-19-2010 06:59 PM  8 years agoPost 13
colsy

rrElite Veteran

Cambridge, UK

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I could never understand why they ship them like that, but reducing the deadband does help.
The are a little noiser after.
If you have an Align swash plate, i doubt it matters anyway

col.

Only Quote From Experience.

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01-19-2010 07:18 PM  8 years agoPost 14
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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The new Hitec programmer is only about $20. Check Tower Hobbies.

Dr.Don

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01-19-2010 07:55 PM  8 years agoPost 15
koppter

rrApprentice

Virginia

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<<I could never understand why they ship them like that, but reducing the deadband does help.>>

I am going to guess that this is being done in response to ganged control surfaces on larger airplanes - some hitec servos just come out and say don't run together - in other words, this servo doesn't center well. one way to overcome that is to increase the deadband - something that a lot of pilots wouldn't notice. This is one area where a swash leveler is useful in revealing servo error.

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01-19-2010 08:04 PM  8 years agoPost 16
Justin Stuart (RIP)

rrMaster

Plano, Texas

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This is the original Hitec servo programmer which is $120:

http://www3.towerhobbies.com/cgi-bi...p?&I=LXSYU0&P=8

Will this new servo programmer that is $27 do the same thing?

http://www3.towerhobbies.com/cgi-bi...p?&I=LXWCE8&P=8

I would like to experiment with decreasing the deadband on my flybarless Trex 250 HS-5065mg servos to see if maybe I can minimize some of the wobble, and for $27 that sounds like a good deal.

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01-19-2010 08:32 PM  8 years agoPost 17
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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Yep. The new cheap unit does give deadband adjustment. Also allows you to set the location of the center and end-points of travel.

Dr.Don

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01-19-2010 08:34 PM  8 years agoPost 18
colsy

rrElite Veteran

Cambridge, UK

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The HFP 10 and 20 are standalone unit's. I.E portable nicad powered all in one.

The one you are looking at is the adapter, same thing but plugs in to a pc, and the interface runs from there.

OK, but means laptop.

col.

Only Quote From Experience.

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01-19-2010 09:59 PM  8 years agoPost 19
racer944

rrApprentice

Greely, Ontario - Canada

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FWIW, I have been running Hitec 6965/6975 for a few years now, and their programmable nature is a big part of why I feel they are so good.

Setting up a heli is easy, as with the programmer you can center them 100%, adjust end points and travel as needed, and as mentioned you can adjust the deadband as needed. Very precise, and the karbonite gears hold up well.

The programmer I have is also a great servo tester... but it is nice to see they have a cheaper PC based unit now...

Cheers;
Eric

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01-19-2010 10:11 PM  8 years agoPost 20
Heli 770

rrProfessor

USA.

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jrockstuart
The HS-5065MG deadband won't go any smaller than 2us. I checked a new one with a HFP-20 out of the box and it was set at 2us.

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › I just found out my servos suck!
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