RE: HV Servos or not?
 

Hi Shaz,


Yes I am building per BVM with upgrades. I dont think I will have mine for 6 weeks ++. I think I might go LiFePo.

Will let you know when I get it. I have to get some servos on the way soon, was waiting to see if my UB or A10 would sell first.

Hope all is well out there!

Dave

RE: HV Servos or not?
 

Make sure that your whole system is HV compatible (or you have different voltage power supplies available) if you want to use HV servos. I had a delta and bought 2 HV servos for the elevons but then couldn't get a suitable servo for nosewheel steering so had to abandon the idea. This was a while back when HV servos were new and the availability is much better now. However, I would make sure that everything (electric gear, all servos, switches, valves, sequencers etc) all work at the required voltage or it becomes a pain to sort out.

RE: HV Servos or not?
 

Tom,

The Product Description says they are OK:

JR’s HV servos are designed with motors and electronics that operate off the direct voltage of a 2-cell LiPo, LiIon, or LiFe receiver battery pack (6.6V to 7.4V nominal voltage).

In any case, a brilliant marketing move by JR to convince everybody they need to spend $200 for HV servos when the previous, non-HV ones have worked fine for years.

RE: HV Servos or not?
 

The usual cure for the servo's going over to one side when switching on is to rebind after setting everything up, this usually cures it.

Mike

RE: HV Servos or not?
 

Craig, I think you are missing the point. JR's marketing states that HV servos were introduced because of the change in battery technology, with widespread use of Lithiums, so that HV servos can be used without regulation, seems a sound logic to me, particularly as HV servos can still be used at standard voltage with only a small torque reduction. It was customer/ technology driven. Your servo voltage spec. is YOUR choice dependant on your battery/ regulator configuration. That said, some HV servos offer really amazing torque.

As for price, many HV servos are little different in cost (some are the same, 6310 and 6311HV for example) as standard voltage servos. Many JR HV servos are priced at way way, below $200 !

It is also unsafe to assume ALL servos of the same spec. will work on unregulated A123s. I replaced some JR 9411 servos after almost 300 flights on the elevators of a Bobcat, fitted with A123s, originals worked fine BUT replacement, new, 9411s simply could not cope, became very jittery until regulated to 5.9v.

regards,

David.

RE: HV Servos or not?
 

sorry finger trouble.

RE: HV Servos or not?
 

Thanks everyone.

I just have to decide if I am using the weatronic receiver or the 1222. The idea was if I use the 1222 and the HV, I dont need regulators, otherwise I am with Craig. All of my other regular JR servos have been great.

Thinking HV/1222/ LiFePo at the moment.

Dave

RE: HV Servos or not?
 

So in other words, they reduced the quality of their "old" product so we have to buy the new one? 300 flights seems like a pretty good endorsement for a servo/battery combination. I'm not disagreeing with the logic behind HV servos but what worked in the past should not change just because something "better" comes along.

Craig

RE: HV Servos or not?
 

Please be aware that if the servo number doesn't exist in the Horizon Hobby inventory, if it ever needs service, Horizon will not work on it. Already know by trying to get service work done on 8511's. They told me if it is not sold in the Americas they will not touch it.

FYI
Alan

RE: HV Servos or not?
 

Craig,

I think your statement is totally unjustified and very wide of the mark. I do not believe for one second that JR has reduced the quality of their standard servos just to force us to buy HV, they are simply giving us the choice, now the use of lithiums is widespread. In the case of my 9411 servos JR may actually have IMPROVED the servo in the 8 years since the old ones were installed. The new ones may well have better, stronger motors and enhanced electronics to extract the best performance at the design voltage and operating them at a higher value, unregulated 123s, caused the overshooting and slight hunting at end points and neutrals. Operating at design voltage they seem to be faster and more powerful than the old ones., they certainly work beautifully. I changed the servos for new ones only because I had need for two 9411s on rudders of other models and it seemed logical to put the NEW servos on critical flight controls. *

Using your logic we would still be flying around using VORs and ADFs when FMCs, IRS and GPS with digital autopilots are available, in fact the norm !!

I rest my case m'lud.

Regards,

David.

* Some may remember I rejected BVs recommended BobCat rudder servo spec. (as did JR) 11 years ago and instead installed 9411s (and on elevators). Those original 9411s are still installed on the Bobcat rudders. As the rudders have a gyro on them and hence are VERY active, moving continuously, I will leave those servos in use till (if) one fails to see just how much life there is an a servo ! At the moment those servos still work beautifully with very little gear slop and are still very accurate.

RE: HV Servos or not?
 

David,

Using your logic, VOR's and ADF's would have quit working when they were IMPROVED following the introduction of newer FMC/IRS/GPS technology, but of course, that didn't happen. My comment about JR reducing the quality on "old" servos was facetious and I stick by my assertion that what has worked in the past should not quit working with the advent of newer technology.....a justified opinion, in my opinion and very much on the mark.

I'll buy the "better", "stronger", "enhanced", products when I have the need and feel they match the proven reliability of my current equipment.

Regards,

Craig

RE: HV Servos or not?
 

Those original rudder servos were only a problem when a gyro was installed. And.....I still stand by my original comments from 10 years ago the only problem with the elevator servos was poor rigging on the part of the builder. My Bobcat STILL has the original elevator servos in it, and it's 11 years old with a bazillion flights on it.

DR

FWIW I like the new HV servos but then again I like LiPO batteries as my receiver packs as well.