Here is the deal, I am getting into jets and will be flying the Y/A F-16.

I was wondering if I could some input on what everyone thinks is the best servos for the A/E/R/T, etc...

I know this is touchy subject like Ford vs Chevy, but I would like to see what the all the jet people think. Reliability, strength, etc...

Thanks

I recently did a little testing on some Multiplex and Hitec digitals. I broke my test set-up before I could max out the servo. I explained what I did and offered my test results here. Do a search.

Hey Rocketman, I'm gonna check your other thread out in a minute, but on this subject, Reid and I were watching Eddie's GPS onboard video the other night, I think he was running behind you at Florida Jets? Anyway, he rarely got over 100 MPH during that flight. When we were doing all our load tests here, we were basing our servo requirements on max deflection at 200 MPH. After watching that video, I'm wondering if the speeds I'm telling people these jets are going, and the speeds I'm hearing people tell me their jets are going, are just serious misjudgments of speed. When we did our servo load tests, and polls of what servos were being used on Isobars, Reid and Roger couldn't figure out why you guys weren't blowing elevator servos. Well, the answer in my mind now is that you're not going 200 MPH, and even if you are, max deflection at that speed is never gonna happen. Even Burt in Michigan is running 69 ounces on elevator on his Isobar. So in answer to the original question, don't worry about brands, just go with proper ounces of torque per control surface. There are load calculators on RCU that will help you determine what you could have on any control surface, but in generalities, what I'm seeing is that any elevator system out there is going to need around 70 to 130 ounces and ailerons are gonna be arund 50 ounces and you can figure the rest. I flew a YA F-16 DF with standard ball bearing 30 ounce servos all around. Flew great. If you go turbine, you'll probably want twice what I had which is still in the range of $40.00 servos all around. You can do a search for the test results I came up with testing Multiplex MC V2 servos and JR 8411's in this area of RCU. Good Luck, Sean

Oh, I thought you did another test than the one we were all doing at the same time. Oh well, when I get all my stuff back in gear, I'm gonna run some more tests on some different servos. I'm hearing some talk about these new Hitec digitals. I'd like to give them a few yanks. I bought a couple just before I left on the trip. And by the way, I got a great deal on a new Kangaroo, never flown, fully dressed out, and the insides were laid out the "right" way, so now no more making fun of my spaghetti inside! Plus, it's got the Robarts. What a deal. We were talking about trailers. I've found some good deals, give me a call later if you're seriously considering something in the $1,500 range. I think there is a 6 x 10 here in Austin for that. He's been using it to haul his airplanes. Bob Covish has his phone # I think.

I believe that's exactly the point that TonyF was trying to make when he posted (in http://www.rcuniverse.com/showthread...max#post968803):

Gordonn

Thanks for the information,

Alan

I need to call about the trailer. The GPS video was indeed slow, but only because we had throttled back to attempt to get some close in formation action. Eddie has radar data that showed that his Olympus powered Bar was easily exceeding 200 regularly (if I remember correctly). At full throttle, we estimated the 3000 powered Bar at about 180 to 190. Don't get me wrong, I agree that a regular coreless ball bearing 69 oz servo is probably enough, but since I want to be sure, I go way overpowered. Don't forget, Eddie flew the original Isobar to death with Fut 3001s on ailerons, gave it to me, and I flew it through a second lifetime until the 9Z WCII killed it. But it's a warm feeling thing to have more torque!

I read SOME of the comments on the thread that Gordon pointed out in the above link.

I think the stiffness of flying wing/aileron, the quality of the hinges and push rod and the HOLDING torque of the servo all are to be considered. Having said that, I never could understand how come the IMAC guys use FOUR 8411 on their rudders and their planes are not going more than a 100mph? I know the rudder is huge, but the speeds at full deflection are modest.

Are we OVER buying torque in our jets? IS there a false mind set that we need 8411 on EACH flying surface for the Bandits out there?

Then again, the "reliability" of a more expensive high end servo is PRECIEVED to be better, but is it really better?

May be the Hitec 5645 digi is a great buy for around $56 to be used anywhere in our jets.....Just wondering!!

There are some Bob cat owners that may dissagree

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Then again, the "reliability" of a more expensive high end servo is PRECIEVED to be better, but is it really better?
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Threre is really no way to find out, I mean RocketMan
can hardly build a device to measure tourque without
it breaking, muchless run 10 servoes at 100% untill
they break on there own... There are some things
you just have to assume to be better than others.
This may be one of them...

Eddie Weeks

I don't fly giant scale or jets but if I did I would look at the cost of that servo as a piece of mine knowing that was one less thing to worry about failing on my $3000 - $20000 machine.
James

I just finished an Avonds F-16, installed two hitec 5945`s on elevons. They are tight and fast, very pleased so far. I have used all 8411`s in the past but may stick with the Hitecs now.

I believe we overkill on servos for our jets, more money spent means more reliability?? I glued the elevons together on my Rookie and have one 8411 in each wing, plenty of torque for my flight profile.

Vin...

I have a Bobcat, and I can tell you if I do a loop at a high throttle, the elevator servos seem to stall a bit before responding. If I do a smilar loop but with less power, the elevator seems to respond better (IT also could be the thrust angle of the turbine).

That's why I am asking these questions. I think we need a data logger that can moniter servo movement, current per channel G force and speed. With this data, we can understand what's going on and may be pay less for the servos!!!!!