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5975 Karbonite application - 8/18/2004 4:11 PM   
3D Joy



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From: , QC, CANADA
Status: offline 		I have flown a 11 lbs 1/4 scale cap 232 for the whole season doing 3D and advanced IMAC with 2 of these servos on elevators and am very peased with the performance, precision and SPEED. Recently, I ordered a new one for my rudder which is a pull pull setup as the one it replaces has gone bad. They now come with a new box and it is written on the box to not use them in planes larger than 60 size.

Now I know I would not use those servos in large gas planes but mine is a small glow and I would expect it should do the job. I know it works harder on rudder but those I have on elevators are overkill anyway (I needed precision mostly due to 3D movements and finesse for IMAC so centering is critical).

So am I OK to use these 3 servos (here in canada 325$ worth of servos) in my plane ?

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RE: 5975 Karbonite application - 8/18/2004 5:16 PM   
SMALLFLY-



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Status: offline 		Color me inquisitive. I have them on the ailerons of my 33% extra,(4- 2 each aileron) about 20 flights so far with no problem. Mike If they shouldnt be there I would sure like to know. at the time the karbonite was supposed to be better at anti vibration (wing servo MG's get chewed up fairly fast from the vibration). If they truly have been designated a lower tier servo now I would sure like to know. and why?

< Message edited by SMALLFLY- -- 8/18/2004 8:17:54 AM >

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RE: 5975 Karbonite application - 8/18/2004 7:38 PM   
MikeMayberry



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Status: offline 		We have been testing the new 69XX (replaced 5975) in larger birds and have had no failures to date. The limit we feel for a single servo application is about 12lbs but if you spread the load by ganging them in larger birds you can double that.

Be aware that we have to be conservative when printing a recomendation because the users will no doubt push beyond those limits. This is true with almost anything you can think of.

I would not recommend this set up for the Karbonite 5475's however as their gears are much thinner than that of the 69XX series and are not as sturdy overall. I would not use them in applications over .60 size to be on the safe side.

Mike.

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RE: 5975 Karbonite application - 8/18/2004 7:54 PM   
3D Joy



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Status: offline 		As I can see, abount the only application of this servo would be pattern planes and like in my application, small (very small) IMAC planes.

I like to see that 69XX servos are better overall than what it replaces, I like what I have already so it should be very good !!

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RE: 5975 Karbonite application - 8/18/2004 8:41 PM   
SMALLFLY-



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quote:

ORIGINAL: MikeMayberry

We have been testing the new 69XX (replaced 5975) in larger birds and have had no failures to date. The limit we feel for a single servo application is about 12lbs but if you spread the load by ganging them in larger birds you can double that.

Be aware that we have to be conservative when printing a recomendation because the users will no doubt push beyond those limits. This is true with almost anything you can think of.

I would not recommend this set up for the Karbonite 5475's however as their gears are much thinner than that of the 69XX series and are not as sturdy overall. I would not use them in applications over .60 size to be on the safe side.

Mike.

Are you saying that 12 pounds is the limit for the 5975 or the 69XX
also was the 5475 a typo, what's that got to do with the 5975 ot the 69XX or are you just using that as a reference. I think Im OK being my bird is just under 24 lbs and I like the precise feel of the 5975

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RE: 5975 Karbonite application - 8/21/2004 1:52 AM   
MikeMayberry



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Status: offline 		12 lbs is the limit if using one per surface. Two per surface would be 24lbs.

Mike.

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RE: 5975 Karbonite application - 8/23/2004 8:19 PM   
hilleyja


 

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quote:

ORIGINAL: MikeMayberry

12 lbs is the limit if using one per surface. Two per surface would be 24lbs.

Mike.


WHAT????

Are you seriously saying the HS-5975 servo has no business being on the rudder of my 18.5 pound airplane, even if the manufacturer specs it for 70oz servos? Why is that? I can even extropolate that to mean the HS-5645s I put on my 4 airlons after the HS-5475s gears stripped out in normal flight, are also not appropriate.

Are you saying that the only appropriate Hitec servos on airplanes larger than .40 or .60 glow are the high-end Hitec servos? Why would I even bother with your 5600s or 5400 servos, I can easily get much cheaper servos appropriate for those airplanes. I had assumed, up to now, the Hitec servos were a good buy for the money. I considered the HS-5975 a significant upgrade enhancement to my rudder; it does have almost twice the torgue rating, and it does have the emazing Karbonite gearing?????

BTW, do you realize the alarming nature of what you just posted above? I even know someone using HS-5600 servos in a $12,000 turbine jet. Wait till he sees a copy of these posts.


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RE: 5975 Karbonite application - 8/23/2004 8:36 PM   
MikeMayberry



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Status: offline 		hilleyja- Where do you read into my post that the 56XX servos are not appropriate for any application over .60 size?!?!?!? I said I would not use the 5475's in anything over .60 size due to the gear strength. The 56XX servos use metal gears and the 5975 and 69XX series servos have much more meat on the gears (30%) than the 5475, so they should be fine in single servo applications to 12lbs. Does that mean that they will fail in the rudder of your 18lb plane???? Not necessarily; alot depends on the type of airplane and how you are going to fly it. It you plan to fly it hard then I do think it is pushing the application for the Karbonite gears.

Please remember that the Karbonite material is 4 times stronger than nylon but many times weaker than metal. If in doubt go with a metal geared servo.


Mike.

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RE: 5975 Karbonite application - 8/23/2004 9:30 PM   
hilleyja


 

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quote:

We have been testing the new 69XX (replaced 5975) in larger birds and have had no failures to date. The limit we feel for a single servo application is about 12lbs but if you spread the load by ganging them in larger birds you can double that.


Please explain this! This is the statement that is telling me an HS-5975 is not appropriate for an airplane that exceeds 12 pounds. Actually, you are saying NO single servo is appropriate for a control surface on an airplane that exceeds 12 pounds.


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RE: 5975 Karbonite application - 8/23/2004 10:48 PM   
MikeMayberry



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Status: offline 		You have misunderstood my post.... What I was saying was that the 69XX series servos will operate with no problems, if using a single servo per control surface, in aircraft weighing 12lbs or less.

I did not say ALL servos; we are discussing Karbonite geared servos in this thread.

Sorry for the confusion.

Mike.

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