I was thinking of going to Hi Tech servos. I know alot of people that have swithched to them with no problems.
However they are not flying turbines models.
I was looking at the 5645s
any opinions on this would be appreciated

I use hitec in my Rc trucks.. right now i have 8 GWS 2bb servos in my DF mirage.. havent had any problems with them.. I always use futaba servos in all my airplane from years ago.. but the gws were already installed when i got the jet, so im sticking with them..



-RaZoR

Scott,

This is an FAQ. Do a search of the jets forum for HiTech servos and you'll see a lot of discussion. Personally, I've used HiTech digitals in my DPM Extra 300 with no problems, but I've heard 1st hand stories from guys I trust who have had HiTech failures, but almost none for JR or Futaba, and my experience with JR and Futaba mirrors that. YMMV.

Bob

I use the Hitec coreless digitals on flight controls with no problems. These are the 5925/5945 series, the step up from the digital non coreless 5625/5645's. As with all my Hitecs, I use the servo programmer to burn them in for a half hour or so after I program them.
I have not had one failure. Some guys may tell you differently, but I feel the Hitec coreless digitals are some of the best servos on the market. I like the fact I can program endpoints, speed, deadband, and such. Makes it easy to set up a control surface. I fly DF for now, but would not hesitate to put them on turbine powered models. I know many folks up here that do just that.

Brg,
Jeff

Ditto what Bob says...just search the jet forum for Hitec.... Should provide you enough info to make an informed decision...
Todd

i have hitec servos in my facet 2300, p-80. and i just ordered more hitecs for my 1/3 scale piper cub



mark

Thanks for the info.

I will stick with what has a better rating from users and myself.

Yep, search RCU, that will tell you enough.

I've run them on my giant scale aircraft, 33%-40% and jets. They work great for me... never an issue!!!!

Jon

Hope you have better luck with them than I did


http://www.rcuniverse.com/forum/m_20...tm.htm#2005676

http://www.rcuniverse.com/forum/m_11...tm.htm#1123697

I have never bought one bundle of Hitec servos that did not include at least one failure, the worst was 3 out of 4 servos digital servos failed on the bench within minutes of commencing testing. Many of the Hitecs I have had have died or shredded their gears while being tested on the bench and not even connected up to anything. I restricted them to non flight-critical functions like operating the brake valve and the last Hitec servo died on the 6th flight, all it had to do was push the brake valve two times per flight. I would never ever trust Hitec to a flight control on a park flyer let alone on a jet.

H

I have had Hitec 5645 digitals in my Super Reaper for a while now. I have never had one problem with them in the jet. I plan to buy more for my next plane as well. I always install new servos in an old plane and fly them for a while to make sure they are OK before I put them in a Turbine plane.

You can do that.....OR.....Just buy JR or Futaba, install them and go fly with confidence?

I use Hitec on occasion. As a matter of fact, I was flying my 232 yesterday and noticed it was flying a little different. Wouldn't hold trim, jerking around every now and then. After landing, as I was taxiing back I noticed one elevator wasn't moving, then it moved, then it hung up. I have 605bb's on the elevator, it seems one had had enough. Replaced it and kept flying. To Hitecs defense, this plane has probably 1000+ flights, and every flight is not a walk in the park. I think the high end stuff is good, I was considering using some on my 46% ultimate, but they are near the cost of JR 8611. So I'll be using JR, especially on jets and giants.

Guys

I have read all this Hi Tec stuff for a while now and just wanted to add this.

P51 1/4 scale Mustang has 645 MG Hi Techs never a problem 8 flights
PT 19 1.20 size 605BB Hi Tecs no problems 50 flights
F20 60 size Cermark 605 / 645BB 28 flights No problems
Numerous flying wings HS 81 No Problems

While I have never installed them in a Jet I don't see the kind of problems you guys describe.

The Digitals from Hi Tec I have no experience with.

I too have had good luck with the Hitec line of servos.I have been using 425 dual bb's , 625 & 645 mg's since 2000 in many 1/4 Mustangs,Midgett Mustangs, and several of my Ducted Fan jets.I have two buddies here at my flying site who use 645 mg's on Kangaroos and have also used them on Hotspots and other turbine ships as well.There has not been one failure in any of these cases.Many many fellow fliers at my field fly with Hitec servos

I Personally started using the Hitec 5645 & 5945 digitals around 2001 again in big prop planes as well as ducted fans.I never had any problems with my big prop planes which were really put to the test and I have had many fast mustangs and ducted fans that they have worked just fine in too.I think the majority of the problems were with the Hitec 5245 mini's.There was several reported losses associated with those if I recall.I have two of those here but will just use them on gear & brake valves in one of my jets.My SM Gripen has a Hitec 5945 on the canards ,I have no worry of using it honestly as I have never seen any failures here at my field firsthand with Hitec servos.I always do test them very good with my Hitec programmer many times over before using just to be safe but I also do the same with JR digitals too.Heck I have been using the cheap 425 bb for years on every control surface in different planes and these are only 45 oz. of torque.Now I will say this however -on my SM F18 I have all JR servos digitals(8611 & 8411) thru-out with multiplex wing servos on the rudders-I used these cause I wanted to go by manufacturer recommendations plus I have one of the JR Matchboxes in it as well . My SM Gripen has 8411 on the Elevons and a 168 on the rudder.Now to turn the coin -In the future I will be using JR 8411 & 8611's on my new jets mainly cause I can get them for moreless the same cost as a Hitec 5945 thanks to good sources .Overall They do seem to offer better centering with more torque.


Steve

I use hitec servo's on my flip 3d. The 645MG ones, they are brilliant and never had any problems with them, the shop I bought them from, the owener used them in his turbine kangaroo. I think with hitec if you don't push them too hard, ie. go for overrated torque you won't get any problems with them, but if you push them too the max, they are likely to fail!!!

Foodoo, a friend of mine put brand new hitec servos in his Facet Turbine Jet. Maiden flight one of them cranked full deflection on aileron and caused loss of the jet. I've heard at least 15 stories like this and countless hitec servos issues like "you need to reprogram the servo" blah blah. I don't "need" to reprogram anything on my JR servos. They work perfect right out of the box.

I have heard a couple of minor complaints about JR servos, none of which I've ever seen with my own eyes. The threads I posted are my own problems with Hitec.

Now, I'm not saying I don't fly some hitecs like their 225's, 525's and 645's, but it's on 40 sized prop jobs where I've got like 300 bucks invested. On jets where I've got thousands invested, I go with the best

What is the story behind the Hitecs going hard over in one direction? I have heard this now from several different places. Has Hitec or anyone else figured out what the problem is?

I have both Hitec and JR Servos. Haven`t had any problems with any one of them. But i like the programming possibility i have with Hitec servos ( i use 5945 and 5645). I also heard this wild stories from someone that heard it from a brother to a uncles sister etc. Just to be safe i only use 4,8 volt on the Hitec servos, because you tend to get spooked of this stories anyway. So to you guys that have destroyed Hitec servos: Did you use 4,8 or 6 volt and which servos did you use? (This is to the ones that have burned servos)

I've use all kinds of servos from Hitec, Futaba, and JR and have not had any problems other than the really tiny micro servos (all brands). I have literally used and still using around 50-60 Hitec servos like the 5945's, 5645, 5735, 645, 425, 5125, 225MG, 85MG etc. and not had a single problem.

This is not to say that no one has a problem or they are 100% reliable - Just my experiences. I've also used 8611, 8411, 7121, 4721, 3321, 3021 and others that I can't think of and no problems either.

Hitec, service is as good as any if not better and you can't beat the programability option.

Thanks - Adil

""I think with hitec if you don't push them too hard, ie. go for overrated torque you won't get any problems with them, but if you push them too the max, they are likely to fail!!! ""

I have had numerous Hitecs fail when on the test bench and the output arm not connected to anything. Just how "don't push them too hard" do I have to be with them? I have had 225s shred their gears on the test bench. I bought 4 of Hitec digitals and 3 of them went berserk within 2 minutes, on the test bench. I bought 2 225s, fitted one to my jet for the brakes so all it had to do was push the brake valve a couple of times each flight and it died completely on the 6th flight. And it goes on and on like that with every batch of Hitec servos I have ever had the misfortune to use. I wouldn't trust them to a kid's paper plane.

H

Wow!! If I had that kind of luck with anything I'd definately not have anything to do with it. I notice that you're located in the United Kingdom. I'm not familiar with the radio systems there. What receiver battery packs do you run? Is it the typical 4.8v and 6v systems?

I've used hitecs now for a # of years, I have them in my kangaroo with jetcat P120, comp arf 40%, aeroworks 39%, Comp arf 2.6m, 2 H9 33% sukhois, 1 H9 33% cap 232, 1 H9 33% extra and many, many more. I've had NO hitec servo failures that were not a result of my doing, had 1 burn up after a wreck!!! With the odds that you've had I should have had 30-40 failures, whew!!!! I'm glad I'm having good luck I guess!!!!

Jon

i think alot of people are quick to blame "hitec" servos for failures, maybe it's true, but i have been using hitechs for a while now , and even in my turbine with no problems.

it is hard to pin point the true cause of failure,

battery low.
over stressed the torque of which it is rated.
wrong instalation.
maybe it was damaged in a previous accident.

WHO REALLY KNOWS???????

maybe if the pilots listed the the servo number of the ones that have failed.
how can we find out the true answer.

as always, just my opinion

mark

I have been using Hitec servos for years also. From Giant scale warbirds to Turbines and have not one failure to date. These are big heavy planes that are much more demanding than a 18 to 25 lb jet. Ziroli Hellcat, P-47, P-38 AD F-16 Avons F-15 and a Viper Jet. My latest project is a Cactus Aviation Tigercat with a pair of Brison 5.8's. The Tiger is huge has 80# of thrust and is heavy, I'm not sure if you can push a servo much harder than that. Not one problem! Good luck deciding Mike