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Old 07-08-2016, 10:34 PM   #11
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Re: Understanding HV sytems


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Originally Posted by cosmith View Post
6.6v Life batteries are fine with LV servos, a fully charged NIMH battery is giving you roughly the same voltage anyway. Life chemistry provides 6.6v from fully charged to nearly dead...disadvantage being it is hard to accurately tell what state of charge they are in.
True enough! Paranoid chap that I am, I have telemetry on all the planes that I run separate rx packs for (I fly electric only, so far), so I know if there's a voltage dip. And I use fairly big packs.
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Old 07-09-2016, 10:46 AM   #12
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Re: Understanding HV sytems

This bad boy will be the heart of my new setup.
I'm going the HV servo route with two LiFe packs
I really like this setup.
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Old 07-09-2016, 11:39 AM   #13
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Re: Understanding HV sytems

This setup I am using would work fine for HV also. Rx has 6 spots to plug in power so load is spread out. I am using four input wires. Nothing wild for servos, 8 Digitals of around 125-150 ounces.
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Electric flying is pretty much seeing how close to a dead short you can run without setting it on fire.
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Old 07-09-2016, 12:05 PM   #14
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Re: Understanding HV sytems

Nice tidy setup there, where are your batteries located?
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Old 07-09-2016, 03:56 PM   #15
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Re: Understanding HV sytems

Rx and lighting batteries in trays meant for LiPo powered plane, where the foam fillers are taking up extra space.

Ignition battery is under front edge of windscreen.
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Old 10-07-2016, 09:45 AM   #16
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Re: Understanding HV sytems

Thinking of switching my gas (30cc) plane from 6v NIMH to Life packs over the winter. regular hs625 and 645 servos x 6. Does anyone run a 6vBEC from life pack to on/off switch? (then to receiver etc)
Or is it really necessary to have the bec?
my 6v packs when charged usually settle in the 6.4 - 6.5 range so it would be sweet if i didnt have to add a bec of some sort!
Any advice would be great!
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Old 10-07-2016, 02:01 PM   #17
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Re: Understanding HV sytems

I have just started using life, and my servos didn't die on me yet (2 flights so far). Hopefully they won't...

A five cell nimh will be 7.25 volts off the charger. A life pack will be 7.2 of the charger, but will almost immidiately drop to 6.6/6.7, and sit around there until it is almost completly discharged. A nimh will also drop in voltage, but will surely be above 6 volts with a 5 cell.

It's up to you, but a bec is always another point of a possible failure.
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Old 10-07-2016, 02:46 PM   #18
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Re: Understanding HV sytems

Read thru and unless I missed it , what would be your thinking for wanting to use HV receiver and servos ? What type or size of aircraft are you looking at ?Thanks
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Old 10-07-2016, 09:53 PM   #19
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Re: Understanding HV sytems

I'm going the other direction back to NIMH. I've had rotten luck with lipo. Life as well they don't balance well on my charger. High voltage with high current available for high surge current equals big smoke when things get ugly. I
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Old 10-08-2016, 01:24 AM   #20
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Re: Understanding HV sytems

Problem with nimh is limitations with higher current draw unless you parallel them. Great for light duty jobs such as transmitter packs and simple 4 servo setups that don't have any linkage and hinge binding issues to create higher current draws.

Robert : what charger are you using as that could be the problem and not the batteries ? Also do you
Store your lipos at near fully charged or do you storage charge/discharge them to about 3.85 v per cell ?

As for the use of Castle Creations 10 amp BEC ,that one is pretty much rock solid and very dependable. Haven't heard of any issues , only great comments. The early power 20 amp ones they did have issues
But that has been fixed several years ago when they found a chip in the system didn't measure up to specs.

The thing with using servos over 5 v is that some servos are not rated higher than that. Go with what the manufacturer allows. Some brands are more critical than others.

Last edited by stegl; 10-08-2016 at 01:36 AM.
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