wingburner

My Feedback: (17)

Pedro....That's why we have choices in this world,so we can have opinions....I have 28 JR 8611's working flawlessly for me and you have the 5955tg's working for you...Mine are also on 42% and 35% models.....Good luck and many happy days flying for you my friend.....Pedro I also have a 85" QQ Yak that has 5 5955tg's in it....Unforetuneately I haven't flown it yet but I will get a true comparison this summer

Jack

DKjens

My Feedback: (50)

Jack,
You are discarding the apples after having problems with the bananas. As Pedro said, supposedly we are comparing servos in the 280-330 ozin category, let's keep the talk around that. So, supposedly you have issues with some Hitec srvos, not covered in this thread, well, I've lost better than $4,000.00 in airframes etc. due to JR Tx and Rx, but I don't start using that as an argument agains 8611a's.

DKjens

mglavin

My Feedback: (31)

Believe it or not the problem you describe is typically associated with poor quality high resistance connectors and or low voltage... For two servos to simultaneously hard-over there has to be a common factor... It’s unlikely both servos failed simultaneously too.

How did you setup the servos were they hard linked? Hard linked servos without benefit of matching is BIG problem. Did you check the current draw at neutral and extreme travels to insure binding and excessive current drain was not a factor?

While a wye is plausible why go there? Your radio is capable of driving each servo with an individual channel. And in the case of two servos driving a single surface it’s a paramount consideration IMO.

Do the servos work?

pbrantuas

My Feedback: (3)

You will love the QQ yak. Mine is the 102" and it’s the greatest 3D plane I've flown. I've heard the 85" is just as good.
Have fun.

Pedro.

wingburner

My Feedback: (17)

Michael....There was one servo on each side of the fuse.I don't own a programmer and it's impossible to buy one at this time.I spent quite a few hours setting the rudder up and was completely satisfied with the results.I've set many up the same way.......I have been setting up models since 1987,not all of them big with multiple servos but many large ones with multiple servos.....As far as connectors go,My guess is who knows.I've not seen it before.........The wye was a must,with throttle,choke,2 aileron servos (wyed),2 elevator,2 rudder (wyed) and a battery in a 7 channel receiver.....What went wrong I don't know,but I'm not happy.....something I did wrong,I'll never know....

Jack

mglavin

My Feedback: (31)

Jack,

I'd be willing to bet the problem arose from mismatched servos. Any time you gang two high power digital servos together without benefit of matching your rolling the dice... An inline ammeter will tale the tell and is a must IMO. The problem is simple in nature IMO; as NO two servos out of the box are typically matched well enough at neutral and endpoints and then the variables of installation cause and affect additional concerns. In the old days you could get away with these setups without problems for the most part as the servos dead-band and error signal was wide enough to allow for servo angle variations on hard connected installations.

And as I mentioned NOTHING but HD quality gold plated connectors/wyes/extensions should be utilized with a robust power supply together with other HD power routing devices, i.e., switches, regulators and the like.

Yes, the Programmers have been out of stock for some time; however I was recently informed there due in soon and have been updated too. Utilizing an ancillary device for matching Hitec Digital servos is a viable option when all else fails.

Send the servos to Hitec Service for repair and or evaluation, the service is free.


FWIW:
The HS-5945’s servos are equal to there OEM counterparts in every aspect IMO and is supported by a huge database as well as direct comparisons/testing with like products. I have used hundreds in GS models over the years without issue. To suggest that 5925/5945’s are inferior is simply an incorrect assertion IMO and literally thousands of satisfied users…

Bruce Rolfe

My Feedback: (37)

Mike,
I have an older programmer( 2 yrs old ) can I send it back to HiTec and have it updated? Also is there a cost for this?

Bruce

wingburner

My Feedback: (17)

Michael,

This is an argument that can go on forever and ever...I'm going to let it lie in peace....Hope you have many many more successful flights flying whatever makes you happy and enjoy the hobby......

I know I will.

Have a nice day Jack

mglavin

My Feedback: (31)

Yes, all Hitec Programmers can be updated with the latest revision firmware. The service is free of charge, less shipping expenses.

Bruce Rolfe

My Feedback: (37)

Thanks Mike,
BTW. Very interesting thread. I never knew this much about servos. Thanks again.

Bruce

Steve

My Feedback: (54)

I just set up my rudder on a 27% CA 300L with two 5645's and it took me a good two hours to match the servos across the travel span with the servo programmer. I'll tell you that if you just plugged them in and hooked them up together, they are by no means matched and will bind at some point or another. You have to match the servos if you gaing them. They work great if you do that.

DKjens

My Feedback: (50)

My apologies to jp. I looked at www.troybuiltmodels.com again, and down on the page Gene does say that he is now running the HS5955TG straight of 2 cell Li-Ion. I had not read this when responding to jp's post on previous page of this thread.

DKjens

russian

My Feedback: (23)

Let's stop it! This thread just going stupid. Read instruction manual for 5955, if you find that manufacturer recommend it for use with 7.4volts we can talk and discuss it. You guys making experiments or just don't know how properly use equipment and than blame the great product! As for me, I'm unsupscribe from this thread - just tired of reading this. Finally- this is the best servo - period. I was involved in desining and preparations for production of the firs servo in Ukraine and I know for sure what I talking about this is the BEST!!! After this I'm unsubscribe from this thread ones and forever and wish you do the same.
russian.

mrbigg

My Feedback: (21)

[quoteI was involved in desining and preparations for production of the firs servo in Ukraine and I know for sure what I talking about this is the BEST!!! After this I'm unsubscribe from this thread ones and forever and wish you do the same.
russian.
][/quote]

If you helped design the servo, then your opinion is biased.

jonkoppisch

My Feedback: (162)

I might be wrong but I don't think that he was saying he was involved in the design of this servo, just some of the earlier servos in the UK...

I have been using the hitec digitals for several years now with no failures. I did have 1 issued with the low line karbonite gear, other than that they work great as long as you set them up right. Still using 1 5995 for the rudder on the 40% comp arf...

mrbigg

My Feedback: (21)

I've come to the conclusion that the lower priced servos aren't even worth considering. They are around 60 bucks. For about 100 you can get a 5955 or an 8611a. Both of these, from what I've read, have a lower failure rate.

wingburner

My Feedback: (17)

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dirtybird

My Feedback: (5)

I tested the 5955 on 7.4V because the 5995 is rated for that voltage and I was told they were the same servo.
I think its remarkable that the servo lasted 3 minutes at that load. I don't think the 8611A would last 10 seconds.
Its not the voltage that burns out a servo. As long as the components are designed to stand the voltage, the load that is on the servo that results in a high current causes the burn out.
I think the 5955 has an internal current limiting device. I think you could use it on 7.4 volts and not have problems. Any load you put on it is not likely to last 3 minutes. I wouldn't try a 8611A on 7.4 volts though.

wingburner

My Feedback: (17)

Your right because the 5955 doesn't put out near as much torque as they claim and that my friend is a proven fact.

MikeMayberry

My Feedback: (1)

I 'd just like to state for the record that Hitec does not recommend the 5955 or 5995 be used with a 2S Lipo unregulated for aircraft use. Yes, the 5995 is rated for 7.4v but it is a "Robot" servo... they don't get hurt if the servo fails! Our tests show about a 25% -30% life cycle reduction when using our servos on a 2S Lipo vs. an unregulated 5 cell NiMh.

Wingburner... It's also a proven fact that the 5955 produces far more torque than the 8611 at much lower error signal. I'd be willing to bet that every servo on the market would not meet the manufacturers ratings with the independant testing that was done. If this is the case then the testing should just be used to compare like products to each other and not to the mfg specs. By the way, the reason the Hitec holds at lower torque than it is rated is because it is built to hold at its maximum torque possible without buring anything up. It's instantanious torque is higher.

It's also proven that 5955 is perfectly suitable for a 33% model with just one in the rudder... so if your point is to say that the 5955 is not all it's cracked up to be, I think the real world results speak for themselves.

Mike.

canavanbob

My Feedback: (20)

Please provide the test results that prove the output torque is lower than that specified for all the servos tested. Too many people make statements without giving data to substantiate the claims.
Thanks
Bob

MikeMayberry

My Feedback: (1)

I never "claimed" anything.... I said I was "willing to bet." My point is that without knowing how all the other servos on the market tested using a certain test method that the claim that the mfg ratings are not accurate cannot be made. I think dirtybird has tested other servos so maybe he can chime in here. If everything else meets the mfg spec, then I stand corrected.

Mike.

dirtybird

My Feedback: (5)

I have the proof you need to substantiate the claim that almost all of the servos I tested do not meet the published specs by my method of testing. I think the manutacturers use a torque meter directly attached to the output arm. In fact Futaba importer told me that is the way they test their servos. That testing would not include the losses due to the output arm bearing or due to distortion of the case. My test results usually are about 15% less torque than specifications. I think my test more accurately simulates the way the servos are used.

canavanbob

My Feedback: (20)

Thanks Dirtybird,
I would really like to see your test method and see the results for comparison of the various brands. Not that it really matters, if the servo does what I want it in the plane, that makes me happy. I could care less if it is not up to the mfr ratings based on a test method that is not what the mfr used. I do think it would be interesting to see servos of different mfrs tested using the same test method.
Bob

dirtybird

My Feedback: (5)

I have available a CD that contains tests of some 20+ servos including some of the best servos available. This CD also contains torque vs current plots of some of the servos - helpful in sizing your battery packs.
I am asking $19.95 for the CD. PM me if you are interested