Best servos for jets these days?
12-09-2013, 12:25 PM
#51
Has anyone used the S-Bus Futaba servo's? and does any one make compatible S-Bus or is it only Futaba? I've bought all the S-Bus rx's etc but not any servo's yet. Need S-bus for 2mtr jet.
12-09-2013, 01:05 PM
#53
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Setting up everything to run on S-bus (except throttle control and smoke pump which will each require a PWM signal).
12-09-2013, 04:04 PM
#56
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Keithtsr, have you had bad experiences with hitec recently? I am organizing funds and about to purchase the skymaster f14 with twin P140's. It will be completely outfitted with a combination of 7980's and a couple of the 7990's with magnetic encoders on stabs. Just incase, these are $250 servos. Not cheap by any means.
Last edited by PowerBoxDanny; 12-18-2013 at 04:09 PM.
12-09-2013, 04:13 PM
#57
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They were excellent servos! Seems like 8411 for stabs are low in torque. Why not an 8711? My favorite servo in JR was the 8611a but they are no longer in production as I'm sure you knew.
12-09-2013, 04:14 PM
#58
Ok, well one of my buddies, whom will remain anonymous **cough** Jack Diaz! **cough**, just talked me into getting 8711's in the stabs! LOL!!
The only servo's I've had go bad (ie stop working on me for no apparent reason) on me are some small non-digital JR servos and Hitec 5645's.
I have MAJORLY and REPEATEDLY abused hitecs (5955 and 7955) and JR's 8411, 8611, 8611a with only the now well known slop issues with the JR's after countless hard landings, take offs, hard pulls, banging getting them into and out of the house, into the car, etc....
I've never tried 8711's or any of the newer JR servos yet, but Dantley is THE king for trying new stuff that I know of around here, so he's always looking for the biggest, baddest, newest! I'm so proud! *tear*
The only servo's I've had go bad (ie stop working on me for no apparent reason) on me are some small non-digital JR servos and Hitec 5645's.
I have MAJORLY and REPEATEDLY abused hitecs (5955 and 7955) and JR's 8411, 8611, 8611a with only the now well known slop issues with the JR's after countless hard landings, take offs, hard pulls, banging getting them into and out of the house, into the car, etc....
I've never tried 8711's or any of the newer JR servos yet, but Dantley is THE king for trying new stuff that I know of around here, so he's always looking for the biggest, baddest, newest! I'm so proud! *tear*
12-09-2013, 04:36 PM
#60
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I've only used the mini sbus servos on gear and brake valves but it's nice to be able to program certain parameters like deadband. It helps especially on the valves where once you've moved the valve cylinder you really don't need the servo fighting to keep center.
12-09-2013, 04:51 PM
#61
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Ok, well one of my buddies, whom will remain anonymous **cough** Jack Diaz! **cough**, just talked me into getting 8711's in the stabs! LOL!!
The only servo's I've had go bad (ie stop working on me for no apparent reason) on me are some small non-digital JR servos and Hitec 5645's.
I have MAJORLY and REPEATEDLY abused hitecs (5955 and 7955) and JR's 8411, 8611, 8611a with only the now well known slop issues with the JR's after countless hard landings, take offs, hard pulls, banging getting them into and out of the house, into the car, etc....
I've never tried 8711's or any of the newer JR servos yet, but Dantley is THE king for trying new stuff that I know of around here, so he's always looking for the biggest, baddest, newest! I'm so proud! *tear*
The only servo's I've had go bad (ie stop working on me for no apparent reason) on me are some small non-digital JR servos and Hitec 5645's.
I have MAJORLY and REPEATEDLY abused hitecs (5955 and 7955) and JR's 8411, 8611, 8611a with only the now well known slop issues with the JR's after countless hard landings, take offs, hard pulls, banging getting them into and out of the house, into the car, etc....
I've never tried 8711's or any of the newer JR servos yet, but Dantley is THE king for trying new stuff that I know of around here, so he's always looking for the biggest, baddest, newest! I'm so proud! *tear*
Last edited by PowerBoxDanny; 12-18-2013 at 04:10 PM.
12-09-2013, 05:17 PM
#62
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Keithtsr, have you had bad experiences with hitec recently? I am organizing funds and about to purchase the skymaster f14 with twin P140's. It will be completely outfitted with a combination of 7980's and a couple of the 7990's with magnetic encoders on stabs. Just incase, these are $250 servos. Not cheap by any means.
Your statement suggests there is something wrong with hitec servos.
Your statement suggests there is something wrong with hitec servos.
The new JR Servo to look at may be this one http://www.jramericas.com/212942/JRPSMPH83T/?pcat=296 Maybe?
I run 8 8711 in my 40% Edge and fly a mix of digital JR in my little Jets and and run them in my pattern planes. This is strictly my opinion and my preference I am not a servo expert but I do know what works flight after flight for me.
12-09-2013, 05:52 PM
#63
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Roger that, JR is my favorite brand of transmitters.
That is the new hall sensor JR. Same as hitec's version.
http://hitecrcd.com/products/servos/...-servo/product
That is the new hall sensor JR. Same as hitec's version.
http://hitecrcd.com/products/servos/...-servo/product
Last edited by PowerBoxDanny; 12-18-2013 at 04:11 PM.
12-09-2013, 06:38 PM
#64
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Like you said, its preference. I wish more manufacturers had the ability to allow the flexibility of programming. I wonder if its patented technology in Hitec's brand. huh.
12-09-2013, 06:42 PM
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Yeh but you'd have to own Futaba's radio. Hitecs are not bound to any specific radio system. JR has a similar deal now with the XG14 and their xbus receiver. Waiting for JR's flagship XG radio so I can switch from my XG11 and use their awesome xbus feature.
Last edited by PowerBoxDanny; 12-09-2013 at 06:44 PM.
12-09-2013, 07:27 PM
#67
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Any of you guys running sbus servos with a power distribution system? I have a couple Powerbox SRS systems intended for my models, but I am not clear on how these units will work with sbus servos since the powerbox itself is a sbus decoder. From what I understand, if I were to use the Powerbox I can not take advantage of the single wire simplicity (connecting 3 tail servos to a single wire than runs up the fuse) of the sbus system. Is that correct?
Raf, glad Jack talked to you about not using 8411s on the stab of the F-100!
Raf, glad Jack talked to you about not using 8411s on the stab of the F-100!
12-09-2013, 10:00 PM
#69
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Recently setup a jet with these: http://hitecrcd.com/products/servos/...-servo/product
HS-8385, ultra response, very happy so far, They are holding center better than the JRs and have a titanium gear train. Only bad part was that it uses a 25 tooth (futaba spline) and isn't programable like the 79XX series.
But these seem to have much better holding and less give than the 79XX series.
HS-8385, ultra response, very happy so far, They are holding center better than the JRs and have a titanium gear train. Only bad part was that it uses a 25 tooth (futaba spline) and isn't programable like the 79XX series.
But these seem to have much better holding and less give than the 79XX series.
12-10-2013, 07:24 AM
#70
"One thing I did not mention in previous post is JR's phenomenal customer service on servos. Any time I have sent JR servos in - even when I indicated crash damage - they were repaired and sent back to me FOC. Hard to beat that."
Not in the UK, I had two 8511's and another two JR servo's I can't remember the codes and I wanted to send them to JR in the UK for service, quoted me at least £35 per servo so the two cheaper ones were binned.
Not in the UK, I had two 8511's and another two JR servo's I can't remember the codes and I wanted to send them to JR in the UK for service, quoted me at least £35 per servo so the two cheaper ones were binned.
12-10-2013, 08:15 AM
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Why is that? If properly designed with the correct pivot point, there should be virtually no aerodynamic load at all on an all moving tailplane, they will have less aerodynamic load than even a small elevator. The torque required to move them against the airflow even to extreme angles will be virtually zero. You want power and good gears to cope with the rotating momentum and any flutter.
12-10-2013, 08:17 AM
#72
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Why is that? If properly designed with the correct pivot point, there should be virtually no aerodynamic load at all on an all moving tailplane, they will have less aerodynamic load than even a small elevator. The torque required to move them against the airflow even to extreme angles will be virtually zero. You want power and good gears to cope with the rotating momentum and any flutter.
Last edited by dubd; 12-10-2013 at 11:15 AM.
12-10-2013, 08:48 AM
#73
Been trying to find the Futaba S-Bus servo's in the UK and none seem to be in stock. Has anyone used the Futaba hub for S-Bus with standard JR or other make servo's, is everything as adjustable or is it just purely a way of making the servo work and nothing else?
12-10-2013, 09:14 AM
#74
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Why is that? If properly designed with the correct pivot point, there should be virtually no aerodynamic load at all on an all moving tailplane, they will have less aerodynamic load than even a small elevator. The torque required to move them against the airflow even to extreme angles will be virtually zero. You want power and good gears to cope with the rotating momentum and any flutter.
But, the BVM F-100 requires a lot of power on the stab servos.
8411's will be marginal. I have been there
Jack
12-10-2013, 10:18 AM
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I guess being that it is a BVM F100, you can assume the proper effort was taken to make sure it is the correct pivot point. I don't recommend that assumption be made with other ARF's. Nothing wrong with a little extra assurance. In full scale, we fly helis with de-rated components to both minimize stress as it is functioning below its max, elongating its life and gives us a bit of excess power margin. If it weighs about the same, has same gear train, and very similar dimensions, then why not?! Definitely frown on using plastic gear on any jet, not only because of it stripping but because of the occasional bump in the hangar that may or may not have damaged that plastic gear before a flight. My 50 cents that in today's economy is worth well, 2.
Jack! Have not met you but heard a lot about you! You give my last name a little recognition in this hobby! Danny Diaz here! Look toward to meeting you someday!
Jack! Have not met you but heard a lot about you! You give my last name a little recognition in this hobby! Danny Diaz here! Look toward to meeting you someday!
Last edited by PowerBoxDanny; 12-10-2013 at 10:21 AM.