What servos in 1/2 a?
Hi All. The subject title about says it all. I'm building a Jr Falcon with a .061 wasp. I'm probably going 4 channel so to keep weight down, 4 "standard" servo are over kill for power and just add unnecessary weight. There is at least one size smaller servo than standard, do you think they will be OK or are they still bigger than necessary? How much should an ideal plan weigh for an .o61 wasp?
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RE: What servos in 1/2 a?
I have HS81 from Hitec in my Jr. Falcon. You could use Hitec 55 which is smaller and works. There are dozens of small micro servos on the market. Just check them out Futaba--JR-- Hitec--GWS--Hobby-Lobby the list goes on and on
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RE: What servos in 1/2 a?
I also have HS81 from Hitec in my electric Jr. Falcon.
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RE: What servos in 1/2 a?
I really like the Hitec HS-65HB's for 1/2A's. They are working great in my 1/2A Shrike with Norvel AME .061 for power. They are much stronger than the generic (probably re-badged GWS) 9 gram servos by a fair margin, but not too big or heavy, and have the newer tougher Carbonite geartrains. I had a lot of trouble with the 9 gram servos getting play in the gears, centering trouble or jitters from potentiometer wear, and have had to change them out more than once, but since switching to the HS-65HB's, no more trouble at all. The HS-81's are also a good choice IMO, but probably overkill (more power and weight than needed) for 1/2A's.
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RE: What servos in 1/2 a?
The way I see it (and I very well may be wrong) there are only 3 options for servos in 1/2a.
HS-81 - your standard micro servo HS-65 - sub-micro, yet high torque/speed Futaba S3114 - a better alternative to the "feather" sub-micro HS-55. Same price, weight, size... but more torque and speed. -Mike |
RE: What servos in 1/2 a?
I've flown Nelson powered quickies with 5 of the HS-81 servos with no problems, other than wear on the output shaft after 10-12 hours. The BB output HS-65's look really good and now there is the HS-45 which also has a BB output shaft.
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RE: What servos in 1/2 a?
i like the futaba micro, i forgot what the numbers are, and the hs-55, and ive never had a problem with gws stuff.
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RE: What servos in 1/2 a?
I'm liking the HS-65's with the karbonite gears and the bb shaft. They're lightning fast too...
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RE: What servos in 1/2 a?
ORIGINAL: jetranger-RCU I have HS81 from Hitec in my Jr. Falcon. You could use Hitec 55 which is smaller and works. There are dozens of small micro servos on the market. Just check them out Futaba--JR-- Hitec--GWS--Hobby-Lobby the list goes on and on MJD |
RE: What servos in 1/2 a?
I hate 55's. They strip if you look at them funny. I've had much better luck and lifespan out of cheapo bluebirds.
Mike |
RE: What servos in 1/2 a?
the futaba S3114 are very light, quick and powerful but many complain about them having fragile gears...no problems with mine but then maybe i just haven't used them enough.
just installed a pair of hobbico CS-12 micros in a plane that should fly this weekend. from playing with them on the bench they are just as quick as the S3114 and A LOT more powerful. forgot to say that they're cheap to buy too.... dave |
RE: What servos in 1/2 a?
I have tried Bluebirds and other small servos. On my Simple Citabria, with 20+ flights I lost 2 servos, one a bluebird and the other I don't recall the name. In each case the gears were fine. The failure was wire breakage of the wire from the windings on the armature to the commutator. In other words the fragile wires were not potted or encapsulated and were also very tight with no slack in them. They failed likely from vibration. In each case the failure happened in flight, and not in a landing or crash. Very few of the small servos come with rubber mounting grommets to isolate them from the vibrations.
The HS-81 servos have heavier windings in the motors and have not yet shown the same failure. I have some HS-55s and the Hitec rep assured me they were durable in the 1/2a application but I am reluctant to use them. I had to disect the motors to find the problems. I had tested each motor after removal from the servo and found there was no rotation. It was not worth repairing the motors and re-assembling them. I could have unwrapped one winding to give me enough length to reconnect the broken wire. If I had I would have potted the wires in epoxy but then would have had to re-balance the armature. We are talking about a $10.00 part so it was a waste of time. So if the plane can carry the difference in weigh stick with something like the HS-81s for improved durability. I would be really interested to hear how many others are using HS-55s and how many flights or total flight time you have on them. The 20+ flights with the two failures would represent about 3+ hours of total in the air time. Is this regarded as a lot of flight time? Jim H |
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