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HomeAircraftHelicopterRadio - Spektrum DSM › MAH Capacity Telemetry ever going to happen?
10-09-2012 08:59 AM  5 years agoPost 1
OICU812

rrMaster

Edson, Alberta, Canada

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So is it, anyone directly in the know with Spektrum can chime in on this and let a guy know?

I had heard there were some demo articles at the Spektrum booth, would be neat on an electric "HV"- "LARGE" to fly by MAH % versus timer. Often it would really stretch out a flight if you are changing flight modes and styles.

...Once upon a time there were Nitros, flybars and frequency pins...

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10-09-2012 10:25 AM  5 years agoPost 2
wrongler

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Brewerton, New York

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It would be a great idea, I think sales for it would be very high. Just like haveing a precision fuel gauge.

Bill Whittaker

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10-09-2012 12:31 PM  5 years agoPost 3
Taipan

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Sydney, Australia

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Waiting impatiently for this!!

I asked this question a while ago as it was said the JR XG8 etc would have this but is way underrated according to this; https://rc.runryder.com/t708257p1/

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10-09-2012 01:26 PM  5 years agoPost 4
OICU812

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Edson, Alberta, Canada

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Yup remember seeing that. This is apparently Spektrums own gig. Friend saw some demos at Ircha with some bench stuff. Haven't heard hide or boo since.

...Once upon a time there were Nitros, flybars and frequency pins...

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10-09-2012 01:30 PM  5 years agoPost 5
Darren Lee

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Woodstock, GA

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That would be a very nice feature indeed. Would convince me to finally retire my DX7 for a newer model.

Team Synergy / Rail Blades / Morgan Fuel

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10-17-2012 12:53 PM  5 years agoPost 6
ChristianM

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Oslo, Norway

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I agree that would be a very nice feature. In the mean time if you are using a Castle creation ESC they have now added a feature that reduces power or oscillates the rpm when reaching a preset voltage. This allows you to fly without woring about timers and such as the ESC will tell you when you have reached the capacity limit. Just a tip, it works like a charm.

Christian

Burn fuel, be happy

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10-17-2012 01:03 PM  5 years agoPost 7
Darren Lee

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Woodstock, GA

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This allows you to fly without woring about timers and such as the ESC will tell you when you have reached the capacity limit.
Castle reduces power when voltage hits a preset point, not capacity used. The reason for wanting capacity telemetry is that voltage alerts are not accurate because voltage varies with load.

However, it seems to me that Castle could actually incorporate a capacity limit alert since the capacity used is something that's displayed in the logs. Right?

Team Synergy / Rail Blades / Morgan Fuel

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10-17-2012 03:51 PM  5 years agoPost 8
Justin Stuart (RIP)

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Plano, Texas

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Subscribed.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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10-17-2012 04:02 PM  5 years agoPost 9
meowguy

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Saco, ME

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Correct me if I am wrong, but to measure the amperage you need some type of device in series between the battery and the load. When you consider the amperage range, that would have to be some heavy duty device. Further, because it's in series, if the device failed you would lose all power.

Do we really want something else in the current stream that could foul up?

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10-17-2012 04:23 PM  5 years agoPost 10
cbflys

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Nesconset, NY - USA

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You know, the Castle ICE ESCs are already measuring (and logging) current. Perhaps they can add a telemetry tap? That would be cool. Plus, there's a whole bunch of other parameters they can expose (like RPM, voltage, etc.)

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10-17-2012 04:39 PM  5 years agoPost 11
JKos

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Redondo Beach, CA

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It would seem "easy enough" for Castle to add the telemetry output and for radio companies to interface with that and go from there. Perhaps there should be a telemetry communication standard established. (Good luck with that...)
When you consider the amperage range, that would have to be some heavy duty device. Further, because it's in series, if the device failed you would lose all power.
Most modern ESCs already have current measurement built in. It's whether any external device can access it or not that needs to be explored and utilized.

- John

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10-17-2012 04:47 PM  5 years agoPost 12
JKos

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Redondo Beach, CA

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As beeflyer2 mentioned, it would seem the next logical step for Castle would be to implement a capacity warning.

- John

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10-21-2012 02:14 PM  5 years agoPost 13
GScott

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Lewis Center, OH

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The JR one should be adaptable for HV setups assumimg you are running one of the new XG transmitters. I know it only supports 10s but why couldn't you just wire it to one of the 6s packs in a 12s setup. The capacity is drawn equally from each pack so why couldn't you set the alarm to 1/2 of the capacity you wanted?

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10-29-2012 05:00 PM  5 years agoPost 14
OICU812

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Edson, Alberta, Canada

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Gscott....."exactly" I agree!

...Once upon a time there were Nitros, flybars and frequency pins...

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10-29-2012 05:42 PM  5 years agoPost 15
aerocal

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Central California

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Im not trying to start an argument or anything so please dont take it that way.Capacity is highly variable depending on a number of conditions.In high current draw applications like we have with helis its very likely many are abusing packs beyond the design limitations.The biggest limitation is minimum voltage "under load".
The "under load" part is critical.If you are getting a premature low voltage reading or what would be considered a false alarm it means one thing.The pack/cells are not capable of delivering voltage with the amount of current they are being expected to provide.This could be for a number of reasons.If your sucking the voltage down before you use the full capacity of the pack it means that the C rating is being exceeded.
Just because a pack says it will deliver 30,40 or 60C doesnt automatically mean that in actual use it will do that.As packs age they will lose C rating.Many are simply over rated and cant supply what they are expected to.Suck them down below the minimum voltage the chemistry is able to provide and problems will show up.They will start to offgas and puff and/or make serious amounts of internal heat and only further be unable to do what is expected of them.Regardless of the rated capacity if you try to get current out of them too fast you will get voltage sag.This means the pack in inadequate and your pushing it past its design limits.There can be a huge difference in what the label says it will do and what it actually will do in use.The latter is the most important.We all want to be able to use 5000mah out of a pack that is rated for that but in actual practice this isnt always possible without exceeding the voltage limitations.If this wasnt true we would still be using 15 and 20C packs.There is a fine balance between what we expect and what we actually get.
Its a slippery slope trying to use a fixed capacity from a pack and ignoring the minimum voltage limitation.If the voltage is dropping and the capacity is not used yet there is only one solution.Reduce the load.Simply thinking that setting a limitation based on capacity isnt going to solve the root cause.You cant force a pack to do something its not capable of by fudging or ignoring the actual numbers.

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10-29-2012 06:06 PM  5 years agoPost 16
JKos

rrProfessor

Redondo Beach, CA

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Excellent point and well stated, aerocal.

- John

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10-29-2012 06:28 PM  5 years agoPost 17
Ace Dude

rrProfessor

USA

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Perhaps there should be a telemetry communication standard established. (Good luck with that...)
Perhaps we modelers should establish our own standards group (with participation from the vendors) and then ask them to comply. Once one of the major players comes on board the others might not have much choice.

Yeah, I know, good luck with that....

  

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10-29-2012 06:45 PM  5 years agoPost 18
Four Stroker

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Atlanta

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aerocal gets the gold star today. Battery retailers are full of it, always have been. The manufacturer specs. are usually OK if you read them carefully. But considering where the cells come from ?

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10-29-2012 07:27 PM  5 years agoPost 19
Frank Bostwick

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Cincinnati Ohio

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Dont forget we have many points in our systems that can rob efficiency, especially under load. The battery is not the only culprit of voltage sags under load. More than a few links in that chain.

RIP ROMAN

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10-29-2012 07:36 PM  5 years agoPost 20
JKos

rrProfessor

Redondo Beach, CA

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> The battery is not the only culprit of voltage sags under load.

If you are measuring battery voltage, then that's all that counts. What loads the battery doesn't matter.

- John

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HomeAircraftHelicopterRadio - Spektrum DSM › MAH Capacity Telemetry ever going to happen?
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