3D servos
 

Guys,
I was looking at servos for a Ultra RC katana Extreme with a OS 1.60 in it. I was toying with Hitec 5625s on Ails and Eles and a 5645 on the rudder but got interested in JR ST126MGs and wanted to see what the experience it with those servos? I know the difference between analog and digital but was compairing the weight and holding power and they compair well and are 12.00 less per servo. I was concerned with centering and slop though. I also compaired them wht Hitec 645s and they are faster. I have some 645s and they are ok but I won't use them in the Kat.
Just looking for some opinions. BTW I can get the Hitec 5600 series for 44.99 per servo and the JRs for around 32.00 +-.
Thanks for any imput.
Jeff

RE: 3D servos
 

Jeff

For 3D stuff you want a combination of speed and holding power. The JR Sport servo you listed are for exactly that, sport flying and will not tolerate for any length of time the hard work of doing 3D. I had a set on a H9 Showtime once and they lasted about 25 flights until they got really sloppy

RE: 3D servos
 

Bill,
That is exactly what I wanted to know. You have made my mind up and I will look at the 5625/45s or other digis, are there any other servos in that price range 45-50 per servo that have the holding power I need? I have some of the 5625s on a MaxAir Velox with a Saito 1.50 but haven't maidened it yet (got snow early). Santa is bringing some hobbyshop gift certs and I am shopping for the servos.
Also what size 6vt pack would you look at for the digis?? I was thinking about NM vs Nicads also. I have a JR 1500 ma 6vt nicad in the Velox but am kinda concerned about lockout with my Spektrum radio and 7000 receiver under high drain.
I sure appreciate the help.
Thanks

RE: 3D servos
 

I was planning for 5625 on aileron and elevator if I go ahead with the Ultra RC Giles I have my eye on. Will probably run a 6985 or 5995TG on rudder.

For batteries I would be looking at low impedance, high discharge NiMH packs from NoBS batteries.
I run 5x 5645 in my Funtana 90 and run a 5 cell Sub C 4200 pack from NoBS. (needed some forward weight.)
My Showtime 90 has 5x Ace 1313 digitals and runs a NoBS 1950 5 cell FAUP Fat A pack.

RE: 3D servos
 

5645 dont stay centered...havent had a problem with the 5625 yet and alot faster...

RE: 3D servos
 

Replacing my 5645s with 5985s as we speak for just that reason, wouldn't center. Don't know about the 25s but I use a 5955TG for the rudder on my 30%s. Not sure how big your bird is.

RE: 3D servos
 

I have an extremeflight yac 74'' with 5645 in elevators and 5625 in ailerons....evo 45cc..
5645 dont stay centered...

RE: 3D servos
 

Mike, replace them with 5985s and you'll be amazed at the difference. TBM has them for $75.00 each if you buy two or more. That's why we couldn't get my 30% SD Extra 260 to trim.

RE: 3D servos
 

I have a HS985 on the rudder that has insane speed. Not sure how it relates to the 5985....maybe mine isnt digital.....not at home right now so i cant look....Thanks, I will look at TBM

RE: 3D servos
 

For the price difference it's really worth the extra $20 or so to get the HS5955TGs over the 5985s. You get a *lot* more torque and a gearset that will last forever. The first time you find yourself replacing the gears in your 5985s you'll wish you'd spent the price of that extra gearset up front by going the 5955TG route.

RE: 3D servos
 

The plane is about 10-12 lbs. I will look at something else for the rudder if the 5645 won't center properly. The 5625s on the Velox I have seem to center ok. I will look at something like 5985 or the new 7000 series.

RE: 3D servos
 

For Hitec servos, the "5" at the beginning designates a digital servo, thus programmable. Anything else is non-digital thus not programable. Digital will be a bit more torgue and I think a bit faster is speed

RE: 3D servos
 

Thanks guys...I am slowly upgradeing my planes...on a limited budget....5955 is what i really need....Michael

RE: 3D servos
 

i was going to go with the 5625's on both ele and aileron for the funtana 100x. Using 4.8V, should this be enough? Not sure what to use on rudder yet. maybe 5985.

RE: 3D servos
 

h5995 is same price as 5955 (both are titanium gears) and the 5995 has 333/416 oz/in of tourque and .15/.12 speed. only thing is it wont run on 4.8v. it needs either a 5 cell or 6 cell pack but really most people have at least 5 anyway (or you could just use a 2 cell lipo and it would be even lighter. you would need to but a power expander to do this but it would be awesome.

plus power expanders are better for your receiver than just plugging the battery right into it and then feeding the power out of it to each servo. with a power expander the receiver is only used for the white wire (the signal)

RE: 3D servos
 

Although some *have* used them, I don't think Hitec recommends the 5995 (which is a robot servo) be used on model aircraft.

For a start, you'll need the Hitec programmer to cut the throw back from the standard (for a 5995) 90 degrees each way to 60 degrees each way.

There are no benefits to the 5995 over the 5955 for model airplane use and some disadvantages.

RE: 3D servos
 

Just looked your plane up and I would personally say that 5955s all the way around on this thing will be way overkill. Stick one on your rudder and put 5985s one everything else. At $115.00 a piece you're probably not going to need those until you get to 33% gassers. I just changed my 30% gasser over to 5985s on everything but the rudder which is 5955 and it's got plenty of power and speed to throw the surfaces. While we're on the subject, has anyone ever found a way to get the 5645s to center?? I thought these things would be really good when I bought them but they are turning out to be a piece of crap. Listening Hitec???? I got stuck with over $400.00 worth of these things.

RE: 3D servos
 

I have two on my elevator and center them for the first flight...then they are always a couple of clicks off...and they are slow too...If you want to get rid of some (cheap) LOL I would use them anyways....Michael

RE: 3D servos
 

5645's work well. If you use the Hitec programmer to reduce the deadband to lowest setting. It is very wide in default programming.

I will take some used ones as well!

RE: 3D servos
 

;)

RE: 3D servos
 

You'd have to be crazy to pay $115 for 5955TG servos, the 'street price" is around $89 (and I bought mine on special for $84). Even at $89, that makes them the *SAME PRICE* as the 5985s from Servo City.

For *no* extra money you get titanium gears that seemingly *never* need replacing, *twice* the torque and essentially the same speed.

It's a no-brainer -- why waste money on a lesser servo with aluminum gears that will cost you nearly $20 when they need replacing -- effectively making them *more* expensive than the 5955TGs.

I've got Hitec 5925, 5945 and 5955TGs -- I'm not going to bother buying anything other than 5955TGs now.

There's no such thing as "overkill" when it comes to servos -- using one that's more powerful than you need will not harm anything -- except maybe slightly reduce the number of flights you get per charge from your flightpack.

RE: 3D servos
 

Well I get 5985s from TBM for $75.00. Why don't you post a link where he can get the 5955s for $89.00? Thanks! Now, as for overkill. Yes there is such a thing and it comes when you spend ridiculouos amounts of money on things to no benefit when something less expensive would do just as well of a job. If you want to buy nothing but 5955s for all of your planes that's fine, I'm sure your foamies will fly great, but there are people out there working for a living that can't afford to waste money on over-kill.

RE: 3D servos
 

I got my 5955TGs from Servo City in one of their sales and friends have gotten theirs for $89 (2 or more) from TBM and Donald's Hobbies).

You've got to *ask* to get the good prices :-)

RE: 3D servos
 

And here's what TBM says on their website:

"The HS-5955 servo is not much more money than the HS-5985, and with its titanium gears and higher torque, it is well worth the money even if the HS-5985 will do the job such as in 50cc ailerons and elevators."

RE: 3D servos
 

Yeah, well they're getting that extra money, aren't they??