5925 vs 5975  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> 5925 vs 5975
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5925 vs 5975 - 11/17/2003 3:23:35 PM   
xp8103



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Status: offline 		Ok Mike, faced with an installation where the performance (torque and speed) of either of these servos is more than adequate, which do you choose? The MP gear train which is unbreakable? Or the new Karbonite gear which Hitec doesn't call unbreakable so I assume that it can be broken? They are priced the same. Their respective outputs and speeds are similar enough as to make them indistinct. The metal geartrain is unbreakable thus one would think that its use in a high stress place (giant scale aerobat elevators for example) is a good choice yet the Karbonite gear has essentially no wear so IT would seem a good choice. So which is it?


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RE: 5925 vs 5975 - 11/17/2003 4:57:10 PM   
MikeMayberry



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Status: offline 		What is the size and weight of the plane in question?

Mike.

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RE: 5925 vs 5975 - 11/17/2003 6:01:48 PM   
xp8103



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Status: offline 		Mike,
Honestly, I am asking a hypothetical here; I don't have a specific application in mind. I have 5925s in my 24 pound 33% H9 Sukhoi running on 6 volts. I have 5625s and 5645s on 6v in my Midwest Super Stinker. The Super Stinker comes in around the 15 pound range. Let's say I was considering replacing the servos in either of those planes.


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RE: 5925 vs 5975 - 11/17/2003 6:42:10 PM   
sizam



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Status: offline 		Ack, lets say its my 13lb 27% extra?! I just ordered 4 of the 5975's as I thought the karbonite was the way to go, I know the metals are 'unbreakable' but figured the resin would be similarly unbreakable/unstripable, was I wrong? They're certainly lighter which is why swayed me in the first place, that and little to no wear.

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RE: 5925 vs 5975 - 11/17/2003 6:50:30 PM   
xp8103



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Status: offline 		Bill and Ted,
That was sort of the crux of my question. These servos from a performance standpoint seem to be equals of each other. I was wondering what would make one choose one over the other?
BTW, I think for your application, you have chosen wisely.


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RE: 5925 vs 5975 - 11/17/2003 8:04:04 PM   
MikeMayberry



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Status: offline 		The Karbonite gears are four times stronger than the standard nylon. So... let's look at the potential limits of this servo if using one per control surface. I would say about a 15lb plane would be the maximum limit and that may be pushing it. Now... let's say you have two servos per surface... the load is now spread beween the two servos so they could be used in an even bigger plane. There has really been no baseline set as to their true limits; they may be perfectly suited for 40% with 3 per aileron and 2 per elevator half. What we might find is that one more servo per control surface is needed so the gears will hold up to hard 3D flying.

Mike.

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RE: 5925 vs 5975 - 11/17/2003 8:44:58 PM   
xp8103



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Status: offline 		THATS what I was looking for. So if instead I am putting them in a 1/4 scale or 1/3 scale something scale as opposed to an aerobat, we'd be doing ok.


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RE: 5925 vs 5975 - 11/17/2003 9:17:51 PM   
sizam



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Status: offline 		Ah, ok, I guess I guess I feel safe using 5975's (one each) on each aileron and each elevator half, but stick with a 5945 on the rudder.

< Message edited by sizam -- 11/17/2003 4:18:37 PM >

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RE: 5925 vs 5975 - 11/17/2003 11:47:02 PM   
MikeMayberry



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Status: offline 		That is correct that slow flying planes with smaller control surface throw put much less load on the servo and gears than a 3D type aircraft flown at its limits!

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RE: 5925 vs 5975 - 11/19/2003 12:23:50 AM   
Geistware



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Status: offline 		I keep buying gear sets for my servos. If I can have a servo who's gear train doesn't wear out, it is a benefit!

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RE: 5925 vs 5975 - 11/20/2003 6:49:55 PM   
hilleyja


 

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Status: offline 		Mike,

Wouldn't it also be true to say the Karbonite gears are not as sensitive to developing slop over time that metal gears do?


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RE: 5925 vs 5975 - 11/21/2003 6:17:49 PM   
MikeMayberry



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Status: offline 		The gear wear-- or lack there of-- is the biggest advantage. Our tests showed no signs of wear after 250,000 cycles!

Mike.

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