JR 8611a
10-23-2005, 10:28 AM
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RE: JR 8611a
JR8611A has a heavier case. different motor, and slightly higher torque. Some of the original 8611's had a few problems which the "A" servo has addressed. The 8611 can be upgraded to a 8611A. Contact Horizon Hobbies.
10-23-2005, 02:23 PM
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RE: JR 8611a
The "upgrade" is a new top case and maybe a new set of gears and output spline. I don't think they touch the motor. I don't think there is any change to the original specs, just a more robust servo in the end. This of course is a very good thing.
Regards,
Bart
Regards,
Bart
10-23-2005, 07:49 PM
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RE: JR 8611a
Do you think this is to much for the flap servos. I wonder what I could use on the flaps. According to the instructions I can use 46 oz of torque on the aileron. Thanks for all of the help.
10-23-2005, 09:24 PM
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RE: JR 8611a
ORIGINAL: chipperg
Do you think this is to much for the flap servos. I wonder what I could use on the flaps. According to the instructions I can use 46 oz of torque on the aileron. Thanks for all of the help.
Do you think this is to much for the flap servos. I wonder what I could use on the flaps. According to the instructions I can use 46 oz of torque on the aileron. Thanks for all of the help.
10-23-2005, 11:18 PM
#12
RE: JR 8611a
At 4.8 volts the 8611 was rated at 220oz.(according to Horizon website)
Doug, you're saying that the motor is the same and that just by changing the case top you're gaining 40oz (260oz at 4.8v for the "A" version.)
Jake
Doug, you're saying that the motor is the same and that just by changing the case top you're gaining 40oz (260oz at 4.8v for the "A" version.)
Jake
10-24-2005, 10:37 AM
#13
RE: JR 8611a
i personally do not like using digital servos on flaps .... with constant pressure on the flap surface, and a digital servos deside to precisely center, and stay there, this all could add up to unnecessary current draw .... I have heard of planes purning up digital servos even with flaps deployed for extensive periods ..... I have always used the 2721 on flaps and have been happy there .. 8611(a) or 8411 on all else ..
Wojtek
Wojtek
10-24-2005, 08:50 PM
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RE: JR 8611a
Concerning the motor in the 8611A from the Horizon Hobbies web site and I quote:
"JR engineers worked with the motor manufacturers to create a motor with still more power. While it took the better part of a year (servo motors get rigorous testing to make sure they'll hold up to our tough standards), they finally got the job done. With the new motor installed, our R&D staff carefully tested the servo (we do all our own testing in our Champaign facilities) and the results were an impressive 8% improvement to 282 ounce inches of torque using our normal measuring system of 6 volts. The 4.8 volt numbers jumped from 220 oz/in to 240 oz/in."
"the case top was retooled"
Nothing was said about new/different gears in the new 8611A's on the web site. At least I could not find anything. I am sure that if you have an 8611 upgraded to the 8611A the gears will be inspectwed and replaced if necessary.
I don't know how others interpret the first paragraph on the motor but as far as I can see the motor in the 8611A is a new design and is more powerfull. The new motor accounts for the increase in torque from 220 in/oz to 240 in/oz at 4.8 volts.
"JR engineers worked with the motor manufacturers to create a motor with still more power. While it took the better part of a year (servo motors get rigorous testing to make sure they'll hold up to our tough standards), they finally got the job done. With the new motor installed, our R&D staff carefully tested the servo (we do all our own testing in our Champaign facilities) and the results were an impressive 8% improvement to 282 ounce inches of torque using our normal measuring system of 6 volts. The 4.8 volt numbers jumped from 220 oz/in to 240 oz/in."
"the case top was retooled"
Nothing was said about new/different gears in the new 8611A's on the web site. At least I could not find anything. I am sure that if you have an 8611 upgraded to the 8611A the gears will be inspectwed and replaced if necessary.
I don't know how others interpret the first paragraph on the motor but as far as I can see the motor in the 8611A is a new design and is more powerfull. The new motor accounts for the increase in torque from 220 in/oz to 240 in/oz at 4.8 volts.
10-25-2005, 04:49 AM
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RE: JR 8611a
The 8611a servos are wonderful. I think you'll love them in your F18. They are rated at 240 at 4.8 volts then at 282 at 6 volts and they're small (standerd size). They do draw 17ma of low idle current, not too bad ffor digitals, but that IS where you want the digital difference, the holding and nutral power. Analog servos don't reach there torque rating until forced off it's holding possition, smae as the digitals, but the digitals will start applying their torque sooner and keep your cotrol surface where you want it! As far as battery drain, yeah, they do need more power. But that is because they're working much more than analogs at keeping the control surfaces where you want them to be. higher capacity lithiums batteries solves that problem without adding weight to the plane. The 8611a to me are the best bargin out there right now. It hurt to fit my planes I fly now with them (18 servos) but I now enjoy them everytime I fly. And I'm a FUTABA guy, have been for 25 years, but these are, in my mind, the best you can buy.
12-29-2008, 10:22 PM
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RE: JR 8611a
I have stripped Five 8611A servo's out on my Yak 54 35%...........That's over 175 flights! Thinking of going to the Hitec 5955TG let me know your recomendations........
Ray[8D]
Ray[8D]
12-29-2008, 10:32 PM
#17
RE: JR 8611a
I'd recommend asking in the giant scale forum for that type of airplane and flying, much different application than a jet. I would also recommend staying with JR and staying away from Hitec, but that is my opinion based on my experiences and nothing more :P
12-29-2008, 11:39 PM
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RE: JR 8611a
I am new to jets but come from many years in the IMAC world and building large scale gasers. I fly the new JR 12X witch I love, but have had nothing but greef with the 8611s/8711s. After approx. 50-60 flights the gear train is shot and centering is gone. I'm not a 3D guy, just sequence flying. If I use any digitals its the Futaba 9152, its a oversized servo but has a bullet proof gear train and perfect centering, 200+ flights and they perform as new. Just my two cents...
12-29-2008, 11:49 PM
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RE: JR 8611a
Of course there are those of us using 8411/8611/8611a's that have never had the gear slop either.
But the focus of this thread was the 8611a. It was a redesigned case top that added splines to the inside of the case where the brass collar is that one of the metal rods insets into. The servo was splitting the case here under loads as people found they could run 1 servo in place of 2 with the extra torque the servo had. The case wasn't quite upto the demands. T
They also no longer upgrade for free (or at all I believe)
But the focus of this thread was the 8611a. It was a redesigned case top that added splines to the inside of the case where the brass collar is that one of the metal rods insets into. The servo was splitting the case here under loads as people found they could run 1 servo in place of 2 with the extra torque the servo had. The case wasn't quite upto the demands. T
They also no longer upgrade for free (or at all I believe)
