servos
02-22-2009 | 11:34 AM
#1
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From: lake peekskill,
NY
servos
I am finding a lot of good deals on radio Equipment with no servos what I really want to know will any servo work with ant rx like the http://www3.towerhobbies.com/cgi-bin...&I=LXUK84&P=ML
02-22-2009 | 11:49 AM
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From: Garland, TX
RE: servos
In general, any servo will work with any receiver.
There are some tiny receivers that have tiny connectors so they have to have servos with the same connector.
Very old Futaba equipment had what is called the G connector before they started using the J connector. You're not likely to find a lot of this, because it is very old, but it does exist.
Airtronics used to use an odd connector, and the wiring in the conector was in a different order than everyone else. Their current Z connector is compatible with just about everything.
Some connectors have one corner slightly beveled. A hobby knife can make the bevel in a few seconds. Sometimes the J tab needs to be shaved off of a Futaba servo to fit a different brand receiver. Again, it takes a few seconds with a hobby knife.
There are some tiny receivers that have tiny connectors so they have to have servos with the same connector.
Very old Futaba equipment had what is called the G connector before they started using the J connector. You're not likely to find a lot of this, because it is very old, but it does exist.
Airtronics used to use an odd connector, and the wiring in the conector was in a different order than everyone else. Their current Z connector is compatible with just about everything.
Some connectors have one corner slightly beveled. A hobby knife can make the bevel in a few seconds. Sometimes the J tab needs to be shaved off of a Futaba servo to fit a different brand receiver. Again, it takes a few seconds with a hobby knife.
02-22-2009 | 12:17 PM
#3
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RE: servos
I'll add my little input to what carrellh posted.
All manufacturers have torque and other ratings with the servos that they sell. usually, if you are going to build something that is basic, that is, not 3D or puts heavy demands on the elevator, rudder, or ailerons, the servo you choose won't make any difference except on your pocketbook.
Normally, typical applications for 40, 50, 60, 70, and up to about 90 size models will work just fine with the basic, standard servo. You can increase torque, for example, using a step higher servo, and that can be noted by the specs showing a higher oz-in (ounce inch) or kg-cm (kilogram centimeter) rating. Also, you can increase torque and speed by using a 5 cell (6 volt nominal) battery pack over a 4 cell (4.8 volt nominal) battery pack. Before you do this, though, make sure the specs say that it will work with a 6 volt pack.
Ball Bearing servos will most likely last longer than a bushing type servo, however, that difference in time may be insignificant compared to the use it will get. For instance, a bushing type servo might hava an average life expectancy of 1000 hour life span where a ball bearing servo may have a 2000 hour life. That's a lot of flying even for the standard bushing servo. If it is worth the difference in price to you, then knock yourself out. If it becomes a matter of cost, then the standard servo may be right for you.
I have a mixed bag of servos. Some hitec micro servos, some Airtronics basic, some ball bearing, and some ball bearing coreless servos. I also have a few Futaba basic servos, as well as the JR/Spektrum servos that came with the radio, they call them hi-torque digital, but the cost per servo, if bought separately, is around 30 bucks each, so the digital part is probably a bit of a stretch as compared to the real digital servos that go for over a hundred bucks each.
In addition to your tower hobbies link, take a look at Horizon Hobby at www.horizonhobby.com and take a look at their servo selection. There are other sites that have real good deals on servos. Someone posted a site that has the Airtronics 94102Z servo on sale for something like $9.99 each. And that is a fine servo (I have about 12 of them).
CGr.
CGr.
All manufacturers have torque and other ratings with the servos that they sell. usually, if you are going to build something that is basic, that is, not 3D or puts heavy demands on the elevator, rudder, or ailerons, the servo you choose won't make any difference except on your pocketbook.
Normally, typical applications for 40, 50, 60, 70, and up to about 90 size models will work just fine with the basic, standard servo. You can increase torque, for example, using a step higher servo, and that can be noted by the specs showing a higher oz-in (ounce inch) or kg-cm (kilogram centimeter) rating. Also, you can increase torque and speed by using a 5 cell (6 volt nominal) battery pack over a 4 cell (4.8 volt nominal) battery pack. Before you do this, though, make sure the specs say that it will work with a 6 volt pack.
Ball Bearing servos will most likely last longer than a bushing type servo, however, that difference in time may be insignificant compared to the use it will get. For instance, a bushing type servo might hava an average life expectancy of 1000 hour life span where a ball bearing servo may have a 2000 hour life. That's a lot of flying even for the standard bushing servo. If it is worth the difference in price to you, then knock yourself out. If it becomes a matter of cost, then the standard servo may be right for you.
I have a mixed bag of servos. Some hitec micro servos, some Airtronics basic, some ball bearing, and some ball bearing coreless servos. I also have a few Futaba basic servos, as well as the JR/Spektrum servos that came with the radio, they call them hi-torque digital, but the cost per servo, if bought separately, is around 30 bucks each, so the digital part is probably a bit of a stretch as compared to the real digital servos that go for over a hundred bucks each.
In addition to your tower hobbies link, take a look at Horizon Hobby at www.horizonhobby.com and take a look at their servo selection. There are other sites that have real good deals on servos. Someone posted a site that has the Airtronics 94102Z servo on sale for something like $9.99 each. And that is a fine servo (I have about 12 of them).
CGr.
CGr.
11-09-2010 | 04:42 AM
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From: Shenzhen, CHINA
RE: servos
Hello, everyone! I'm new here. And I'm a beginner on aircraft project. I always admire those who can make lots of aerobatic flying. Hope I can fly as well as they do.</p>
11-09-2010 | 06:50 AM
#5
Senior Member
RE: servos
Need to clarify a detail here for the beginners.
Servos called "digital" actually are called that because of the method use to control their movement. Here is one mfg's description. You'll note they mention that both type servos have exactly the same things in them except for the digital's one extra bit. They are either digital or not, btw. If it's sold as a digital, it'll be a digital.
(That last paragraph seems to have a bit of advertising BS in it, btw. They will have better resolution, no matter what the price level, but they won't have tremendous holding power unless their advertised torque can do "tremendous". Which highlights the difference in function between the two. Digitals work to hold the position you ask for. They will have more holding power than the non-digital but it won't be tremendous for the smaller sizes. Non-digitals work to get to the position.)
Servos called "digital" actually are called that because of the method use to control their movement. Here is one mfg's description. You'll note they mention that both type servos have exactly the same things in them except for the digital's one extra bit. They are either digital or not, btw. If it's sold as a digital, it'll be a digital.
To start with, a ‘digital servo’ is the same as a standard servo, except for a
microprocessor, which analyses the incoming receiver signals and controls
the motor. It is incorrect to believe that digital servos differ drastically in
physical design to standard ones. Digital servos have the same motors,
gears and cases as standard servos and they also, most importantly, have a
Feedback Potentiometer (Pot) just like their standard counterparts.
Where a digital servo differs, is in the way it processes the incoming receiver
information, and in turn controls the initial power to the servomotor, reducing
the deadband, increasing the resolution and generating tremendous holding
power.
microprocessor, which analyses the incoming receiver signals and controls
the motor. It is incorrect to believe that digital servos differ drastically in
physical design to standard ones. Digital servos have the same motors,
gears and cases as standard servos and they also, most importantly, have a
Feedback Potentiometer (Pot) just like their standard counterparts.
Where a digital servo differs, is in the way it processes the incoming receiver
information, and in turn controls the initial power to the servomotor, reducing
the deadband, increasing the resolution and generating tremendous holding
power.
11-09-2010 | 08:06 AM
#6
My Feedback: (11)
RE: servos
All things are relative. Take two servos, one analog, one digital... The digital servo develops full torque nearly instantly when the servo is moved. An analog servo develops its full torque when its nearly at its commanded position. So in that regard, digital servos have more holding power (than an equivelent analog servo).
It's also important to keep in mind that there are excellent analog servos, and junk digitals.
It's also important to keep in mind that there are excellent analog servos, and junk digitals.
