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HomeAircraftHelicopterHelicopter Main Discussion › What makes a servo for a heli special?
10-13-2005 08:41 PM  13 years agoPost 1
HERRORHH

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North Carolina

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I'm doing some research for myself. I understand the differences between a "digital" and "standard", between a "coreless" and "core", obviously between a "mini" a "standard" and a "1/4 scale"....I understand what I am looking at when I see a torque and speed table for each different servo...
But what I would like to figure out is why a manufacturer (any) would recommend a certain servo over another for a specific application when even by their specifications other servos they manufacture have similar or better speed and torque?

If you don't have time to do it right the first time...When will you have time to do it again?

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10-13-2005 09:40 PM  13 years agoPost 2
HERRORHH

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North Carolina

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Did I confuse everyone??

If you don't have time to do it right the first time...When will you have time to do it again?

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10-13-2005 09:49 PM  13 years agoPost 3
cwhover

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El Paso, TX

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I'm not certain, but I think maybe vibration resistance would be one reason why certain servos are or are not recommended. I would think a servo in a heli sees more vibration than a servo in a plank.

Carl
VISA field rep

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10-13-2005 09:55 PM  13 years agoPost 4
Wa11banger

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Huntsville, Al

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Im guessing (yes really) that it has to do with vibration like cwhover said, and also maybe higher quality workload components.. In a an airplane most surfaces are not under a heavy strain all the time. Our helis servo load is fairly heavy most of the time and the servos are always moving.. nothing gets to rest ever.. I would think that besides vibration testing maybe they do some core materials/component changes to accomodate our heavier use needs.

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-13-2005 09:58 PM  13 years agoPost 5
Leif

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USA

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Why does any manufacturer market stuff for a particular application?

The designations for "heli" or "car", etc. are specifically aimed at the type of customer who can't be bothered looking at specifications and trying to figure out what the best servo is all by themselves.

However, even customers who think they are smart sometimes overlook design features when attempting to compare different servos. For example, the servo weight and whether it's sealed are factors that matter in a heli more than a car application. Also, metal geared servos can actually wear out quicker than plastic geared servos in some applications. Many of the car servos are built with metal gears. These design issues are not always captured in the basic speed/torque specifications that most people look at.

Leif

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10-13-2005 10:37 PM  13 years agoPost 6
Yug

rrMaster

UK. Herts

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There's no doubt that heli servos take more punishment than any other RC model except perhaps for car steering servos. Reliablility is of the upmost importance in this vibration intensive environment, so I think it is important that the servos have decent bearings to take lateral loading. Gear quality must be good so as to minimise slop which can quickly turn to wear. The hardest thing is finding performance servos for the larger machines, a recent upgrade of mine has been a KO2123 on the collective of my 90. Wow, it works very well. I have some cheap DS811s in an old R50 which work great although not fast enough fro tic tocs, and 9252s in a XeroG which has awesome performance. This needs double raced servos + pivot supports as its an eCCPM machine.
My biggest complaint about servos is the sheer cost. Decent spec servos are so damn expensive and there is no doubt that we are all being ripped off by the servo manufacturers. I would expect that the 9252 which retails for about £60, would cost about £5 at the most to manufacture. A metal gear set for an 8700 is about £25 compared to a plastic gear set for £3. I can't see how there is such a premium for metal gears when one considers the ease by which they are made in volume using modern automated machining. The electronics in a servo will be pence, even if it has a micro onboard, and the motor, particularly if it is brushless is cheap to manufacture. Much of it comes down to marketing strategy which results in high prices on any servos that depart from the lo cost 'budget' servos inspite of the fact that most of the materials being used are the same.

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10-13-2005 10:58 PM  13 years agoPost 7
Yug

rrMaster

UK. Herts

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Go into business and design a servo that outperforms the lot of them and sell it for £10. It could be programmable so as to emulate other servo types, everybody would use it and we would all be better off.

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10-13-2005 11:20 PM  13 years agoPost 8
gigi

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Port-au-Prince, Haiti

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That's right...
I'm with Guy on this one! Even if it may cost a bit more to manufacture the servos, and of course, the R&D costs must be recouped, and the name of the game is not to sell at cost, but to make a profit, but still, there is definitely the evil "marketing" machine at work: Make lesser ones specifically to be able to sell more expensive ones.

An example: Take any BMW, compare the lesser model of a particular series to the top-of-the-line model. Is it worth 10,000 for a 6-cylinder instead of a 4-cylinder? Not in manufacturing costs, but in "status" and with proper marketing, people are obviously arriving to that conclusion.

Gigi

My heli spending has gone way down since I got a Honda 919 :-)

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10-13-2005 11:42 PM  13 years agoPost 9
orlee008

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Miami, FL USA

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look at it like this.... an alternator for a ford costs $100, for a toyota it costs $200 and for a BMW or Mercedes it costs $600?? all alternators share the same components so why such a difference..... why? marketing marketing marketing.

Flying in Miami, FL (Kendall Area)

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10-14-2005 12:12 AM  13 years agoPost 10
Yug

rrMaster

UK. Herts

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Yeah but they're still a ripoff.

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10-14-2005 12:20 AM  13 years agoPost 11
Yug

rrMaster

UK. Herts

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I'd get agoraphobia.

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10-14-2005 12:25 AM  13 years agoPost 12
Wa11banger

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Huntsville, Al

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youve been outside when foo was flying.. thats why... J/k foo but it seems funny

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-14-2005 02:54 AM  13 years agoPost 13
crowfly

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Pleasant View, TN U.S.A.

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What makes a servo for a heli special?
Because the manufacturers are trying to appeal to an ellite group of know-it-alls that don't mind paying more, and will come closer to buying it, if it says "heli" on it.

If God had meant for man to fly, he would have given him more money

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