I have never used their servos,and have seen mixed reviews.I am looking at their 625 and 645 MG servos.Are these worry free in general? Any substitutions for this rating of servo?
Intend to put this in the tail for 72" Katana

I have always used Hitec servos and have never had a problem with them. From micro to massive, they can take some nasty punishment. Other then that JR is one of best in my opinion (but too pricey for me).

Best advice I can give, is to do a search on what your thinking about before buying anything.

O geez here we go again. I find the standard 625 and 645 to be very good standard high torque servos. I have 625's in my DP ultimate, and 645's and 625" in my GP patty wagstaff. They are not as precise as a corless servo, that said they are plenty precise for either one of these planes. I have had the servos in my patty for well over a year with lots of flights. I have had one 645 aileron servo fail at about a year due to vibration of the gas engine. It actually shook one of the chips off the board. Hitec repaired it free of charge. I have replaced all the metal gears at about 9 months, All metal gear servos have to have the gears replaced occasionally, just a fact of life. I have 5925's in my 33% extra and so far I like them a lot, but Ive only got 5 flights on it. There were in the past several people that had planes go in because of early problems with the digital 645 (5645) I havent heard of any problems in quite some time and I know 2 flyers with 33% caps that have them on every control surface. Bottom line, check any new servo thouroughly and fly. I have had problems with the hs-77 aileron servo burning out motors, but then again I was using them on fun fly control surfaces. (sounded like a good idea at the time)

Thanks.It was just recent that I considered these servos,so I never paid much attention to them.He has a few 605 in stock and claims they are the predecessor to the 625's and are very similar.Is this true? If they have no real issues (605) then I may take those since they are attractively priced

Ya - we talk about this subject a lot. I fly all Hitec and never had a problem. I've run their 6 series, mini series, and all the digitals (56 & 59). I broke the gears on a 81 the other day, but that was caused by a hard harrier landing.

My theory is Hitec sells more high performance servos than other manufacturers. Assuming the failure rate is the same as JR & Futaba, they get more complaints on RCU b/ more are sold. This is just my theory and it's based on absolutely no facts. We've had this discussion before and lots of guys disagree with me.

Drew

i totaly agree with vert Hitec it the best servo provider they have never failed me just treat them right and they will treat you right so you can do great 3D

They probably are ok I guess,but I was sure I read that there was a series that were poor,justed wanted to know if these servos fell into the "bad" bunch.I will give these a shot and subject them to my flying style and decide from there I guess.....

The 56 digital series had some programming issues. I understand they have corrected that, and if you have one of those old servos Hitec will reprogram it for you.

I did a bunch of searchs on R/C uniuverse here to find out using the dig Hitechs cause i wanted to use them on my katana, It seems there was a problem with some of the first 56xx series but that was at least 2 years ago. There also seemed to be the concenous that the 56xx series has a voltage drop problem with using long servo extensions and 4.8 volt packs, going to 6.0 volts seemed to be the remedy and nobody using that setup has a complaint. Most every body had nothing but good things to say about the 59xx series digitals and even though they are 25 bucks more a pop thats what i went with, 5925 on all the control sufaces.
I love them so far, 3 gallons of fuel thru the plane with no problems, not a real test of longevity yet (but I was apprehensive at first) so I really think they will be okay. ok enough that i bought three more 5925 and two 5975 (karbonite gears) for the CAPX.
If I have any problems I will let you know. Its hard to justfiy spending as much on servos as on the engine/airframe but when you consider what you might lose buying on the cheap, i think its a worthwile investment.

zonk

Zonker - I'm going w/ 25s and 75s on the Cap-X too. Just bought a used Saito 1.8 for power. I'm also trying this Fromeco LiPo 2200 mha pak w/ the 6v regulator & sail safe switch. The whole setup should be great!

Nitro Wing.
This is just my opinion but I would pass on the 605's. I have had several in the past and they are tough servos, but They have a habit of not centering very well, especially after the get a few hours on them. In a big fun fly I wouldnt worry about it, but in a plane you would like to do more precise manuevers in I would go with the 625 - 645. They are metal gear, the 605's are not. I have had no real centering issues with any of my 625-645's (like I said they are not a coreless motor so they wont center perfect every time, but pretty close) The 605's have been discontinued, that's probably why your seeing the good price

I will switch to LiPos one day but right now I ve been flying the NiMh packs that are distrubuted by Horizion thru their EXPERT brand radio components for a year now in several of my planes and like them a lot. I am running the 6.0 volt 2700ma packs in the katana and will be in the CAPx (or maybe a DP 540---can't make my mind up) With 5 5925s and a JR537 on throttle I can get 60 minites of air time before needing to recharge at the field. Ive also started using the LED voltage indicators---i mount mine in the cockpit--- and will work all my control surfaces including spoilerones all at once before every flight and watch the LEDs' to see if any go from green to orange, if they do i will put the battery on charge. And i always before the first flight will check the battery under a load with my ACE voltmaster, I havent lost a plane or chopper due to a dead battery in several years now since buying and using the voltmaster but i have had to shorten my flying sessions a few times when the meter showed problems before a flight.

zonk