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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> Hitec 5955 ?
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Hitec 5955 ? - 1/18/2005 3:30:21 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		I saw somewhere that the 5955 is rated at over 400 oz torque at 7.2 volts. That makes me wonder, what is the maximum voltage these things can handle?

I know somebody here on RCU says that he has been successfully running 2 cell lipos unregulated into his 5945s.
I'm not looking for an "official" statement from Hitec. i'm just wondering if it has ever been tested. Thanks.
       Post #: 1

RE: Hitec 5955 ? - 1/18/2005 5:04:19 PM   
Brendan Lugo



Posts: 286
Joined: 11/11/2004
From: Poway, CA, USA
Status: offline 		The official word on recommended voltage for RC use is still 4.8- 6.0 volts.


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RE: Hitec 5955 ? - 1/18/2005 5:10:57 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		So, 417oz at 7.2V was just a marketing ploy?

Edited: The above statement came across a little harsh. let me rephrase.

As I shop for this servo online. troybuilt for example they advertise 411OZ at 7.4V.
I see that Smart-fly now makes a Power Expander where they advertise the ability to run 7.4v to the new 5955 servo.

why are these products avaliable? Shouldn't someone pass the word that these products are NOT recommended by Hitec and that any damage to the servo will not be covered? Or, is the "unofficial" word from hitec that 7.4V is ok? Just Curious.

< Message edited by Crash90 -- 1/18/2005 5:37:31 PM >

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RE: Hitec 5955 ? - 1/18/2005 7:12:19 PM   
Brendan Lugo



Posts: 286
Joined: 11/11/2004
From: Poway, CA, USA
Status: offline 		You mean the HS-5995TG (robot servo) not the HS-5955TG servo as the subject says. The 5995TG is rated at 416 oz.in of torque at 7.4 volts but these are specs for robot use. For R/C use the voltage is still 4.8-6.0 volts as this is the most voltage that manufacturers receivers are rated to.


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RE: Hitec 5955 ? - 1/18/2005 7:25:36 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		Here is the Advertisement from troybuilt.

Featuring two ball bearings, digital circuitry, an unbreakable titanium gear train and aluminum heat sink. Weight is 2.18 oz. This is the premier servo in the Hitec line. If you like power, this is the ultimate.
Torque: 333 oz/in @ 6.0v 417 oz/in @ 7.2v
Speed: .15 sec/60? @ 6.0v
Dimensions: 1.57 x .78 x 1.45 in
Weight: 2.18 oz
Gears: Titanium

This is for the 5955 not the 5995

Continued.

NOTE on 7.2v! I'm installing these into my 35% Extra 260 and will be testing out various power sources. I will try running the 7 servos (4-ail, 2-ele, 1 rud) on a 2-cell Li Ion without a regulator (8.4v). The disadvantage of this system is that the voltage will change to the servos as the battery is discharged from 8.4v down to 6.9v. This large of a voltage drop may be noticable to some pilots. The question is how noticable? If the change is not very noticable, this will be the best scenario as it is the least complicated since no regulator is required for the servos. Simply use a Power Expander (see the regulator and power systems page) to separate the voltage from the receiver (5v) and the servos (8v).


I had assumed that these figures came from Hitec. Maybe this is just the opinion of TBM. It just seemed odd that the Power expander is unregulated to the servos.

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RE: Hitec 5955 ? - 1/18/2005 7:29:57 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		Here is their (TBM) advertisement for the Smart-Fly Power Expander.

99.95 Smart-Fly Power Expander
Power distribution system. Eliminates clutter, regulators, switches, a second receiver, Y-harnesses and head-aches!
Does 9 channels
Does 30 servos.
Has built in regulator for Rx at 5v.
No built in regulator for servos.

Has built in 5v regulator for receiver.
Needs switch and regulator for servos which is ideal if you are going to power the Hitec HS-5955 servos at 7+ volts.

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RE: Hitec 5955 ? - 1/18/2005 7:50:50 PM   
Brendan Lugo



Posts: 286
Joined: 11/11/2004
From: Poway, CA, USA
Status: offline 		The specs given by TBM are not Hitec specs. We do not rate the 5955 on anything higher than 6.0 volts and we do not rate them on 7.2 volts. The 5995 is the only servo currently rated above the 6.0 volt rating (for robot use) and that is rated at 7.4 volts not 7.2 volts.

TBM is giving you mis information. I am sure it is not intentional but rather an oversight on their part.


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RE: Hitec 5955 ? - 1/18/2005 8:36:31 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		Thanks for clearing that up.
What's different about the 5995 that would allow it to operate at a higher voltage than the 5955?

< Message edited by Crash90 -- 1/18/2005 8:45:27 PM >

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RE: Hitec 5955 ? - 1/19/2005 1:38:29 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		anybody?

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RE: Hitec 5955 ? - 1/19/2005 4:54:52 PM   
Brendan Lugo



Posts: 286
Joined: 11/11/2004
From: Poway, CA, USA
Status: offline 		The 5995 was designed for the robot market. It will except the higher voltages and comes factory at 180 degrees of travel. The 5955 is designed for the RC market where maximum recommended voltages for equipment in this market is and has been 6.0 volts. The servo also only comes with 90 degrees of travel as the factory setting.


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RE: Hitec 5955 ? - 1/19/2005 5:09:58 PM   
mglavin



Posts: 5203
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From: Elverta, CA, USA
Status: offline 		Essentially the 5955 and 5995 are the same servo less the outer case assembly.

Hitec is concerned about the higher voltage in RC aircraft. The ROBOT servo needs are different than that of RC Aircraft. Thus Hitec is not recommending voltages higher than 6.0V at this time.

Hitec is simply concerned with the life expectancy at this time and overall performance under the demanding loads of GS aircraft. Field experience may validate the application at higher voltages, time well tell as we have a model equipped with the 5955TG's regulated @ 7.4V. We need to put some time on the model to ascertain a reasonable evaluation of the servos condition thereafter.

I have spoken with Gene of TBM previously; we've discussed the voltage and his applications at length. Gene is aware of Hitec's official position in these regards. Additionally, Gene has offered to share his test data and evaluations with us. Gene's assertion with regard to voltage under load and his installation for the test model are an alternative approach and should work well IMO.

The SmartFly Power Expander is capable of the loads thereof in this application and it was not specifically designed for this application, but rather an alternative to other similar products

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RCU Community Moderator
Hitec * Multiplex Field Representative

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RE: Hitec 5955 ? - 1/19/2005 5:32:54 PM   
Crash90



Posts: 2315
Joined: 10/5/2002
From: Cressona, PA, USA
Status: offline 		Michael. Thank you for your honesty. It was always my understanding that essentially, the guts (circutry) of the 5995 and 5955 were the same. I understand Hitecs reluctancy to authorize unregulated use of their servo. Let's face it. They don't want the liability, can't blame them.

I will also be running my 5995s unregulated. I will post MY results as well. Thanks.

One more question. I know that todays Receivers are only "rated" up to 6v. I would think that, if they were forced to, they could handle larger voltages also? I would be reluctant if I were running 8-9-10 servos through 1 Rx because of the High current. Let's face it. At 400 some OZ of torque, we can run all 33% and many 35% planes on just 6 servos. WOW. The future looks good.

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RE: Hitec 5955 ? - 12/2/2006 5:17:32 AM   
Zeeb



Posts: 1852
Joined: 11/11/2004
From: Pleasant Grove, UT, USA
Status: offline
quote:

ORIGINAL: mglavin

Essentially the 5955 and 5995 are the same servo less the outer case assembly.

Hitec is concerned about the higher voltage in RC aircraft. The ROBOT servo needs are different than that of RC Aircraft. Thus Hitec is not recommending voltages higher than 6.0V at this time.

Hitec is simply concerned with the life expectancy at this time and overall performance under the demanding loads of GS aircraft. Field experience may validate the application at higher voltages, time well tell as we have a model equipped with the 5955TG's regulated @ 7.4V. We need to put some time on the model to ascertain a reasonable evaluation of the servos condition thereafter.

I have spoken with Gene of TBM previously; we've discussed the voltage and his applications at length. Gene is aware of Hitec's official position in these regards. Additionally, Gene has offered to share his test data and evaluations with us. Gene's assertion with regard to voltage under load and his installation for the test model are an alternative approach and should work well IMO.

The SmartFly Power Expander is capable of the loads thereof in this application and it was not specifically designed for this application, but rather an alternative to other similar products


I've decided to give the Hitec stuff a try on a new 50cc size and would like to run redundant two cell Li-Ions. I was wondering since there is another vendor besides TBM who is posting torque figures for the 5955 at 7.4 volts, is it still Hitec's position that anything higher than 6.0 volts is not supported for RC aircraft? It may be a moot point as I'm going to use four 5985's and only one 5955 and I don't see anything on Hitec's website or this other vendor's site with torque figures for the 5985 at 7.4 volts.

Thanks!


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RE: Hitec 5955 ? - 12/4/2006 6:04:24 PM   
MikeMayberry



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From: Poway, CA, USA
Status: offline
quote:

ORIGINAL: Zeeb


is it still Hitec's position that anything higher than 6.0 volts is not supported for RC aircraft?




Hitec recommends the maximum voltage be no more than a fully charged 5 cell Nicad/NiMh pack. An unregulated 2 cell Lipo/Li-Io is too much and will reduce the life of the servo motor by approximately 30%.

Mike.

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