mglavin
Posts: 5203
Joined: 11/29/2001
From: Elverta,
CA, USA
Status: offline
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quote:
ORIGINAL: lex2bits
I presume all servos are designed to stall before the gear train fails, or at least I would hope so.
I believe this typically not a problem. In as much as the gear trains seem to fail resisting flight loads. I to would expect any servo to live at its rated torque.
quote:
Where does the word "high" fit in?
High loads are realized with over-sized control surfaces, poor or inadequate linkage setups, wings and surfaces that flex and induce flutter, speed, heavy models and specific maneuvers that are hard on air frames as well servos.
quote:
Is continuous or intermittent duty at the advertised max servo torque rating considered high? Or does "high" mean 125%, 150%, 200% of the torque rating?
I don't have an absolute answer for you, however I believe this an incredibly viable question... Its my belief the gear train is subjected to loads outside there torque ratings intermittently for various reasons as mentioned above. When the gear train is subjected to this abuse it fails. Hitecs torque ratings from my tests and observations are conservative for the most part IMO. De-rating the servos maybe the answer. Additional research is needed here, I'll see what I can do.
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The wear factor of Karbonite is highly desirable over that of MG's, but when does wear become secondary to strength?
I suggest it should not be a factor. The Karbonite gear trains may not work for everyone, there are simply to many variables that the users have control of that are outside the original R&D parameters. There are many modelers using the Karbonite stuff without issue and then there those that are having problems. I am aware of ganged installations on 33-40% models without issue. I am also aware of failures on 80" gas powered models on large aileron surfaces and such.
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For illustration purposes, let's say a manufacturer recommends 100 in/oz MG's for his 3D plane. Will a 100 in/oz Karbonite suffice?
I think there are variables in this circumstance and its a tough call. That said I would probably not use the Karbonite's in this application. But as I mentioned the variables of the specific model and use might cause me to reconsider.
Sorry for not really answering your questions, I wish there was more concrete info available and we had answers for all circumstances. When you consider all the uses and abuses of these products its not uncommon to find many users with unsatisfactory results for whatever reason and then there all the happy users that far out weigh the problematic examples we often hear of.
< Message edited by mglavin -- 12/9/2004 4:58:27 AM >
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Michael Glavin
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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 >> Why discontinue the HS5975HB servo? 
Why discontinue the HS5975HB servo? - 
