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Old Jun 06, 2012, 09:35 AM
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lipo flight pack?

is it possible to use a 7.4v lipo fligh tpack with my hitec recivers? would i need anythign inbetween the batery and the RX?

i am talking about powering the servos and RX with this batt.

thanks
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Old Jun 06, 2012, 11:20 AM
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I don't know what the max. voltage is for the Hitech RX, you would have to look up the spec. but IIRC some other brands are good up to about 9v.

Most servos are rated for 6v nominal voltage, 6v batteries are higher than that when fully charged but that Lipo would be about 8.4v fully charged, too much for normal servos, but there are servos rated for the Lipo voltage.

So unless you have high voltage servos you would need a voltage regulator between the battery and electronics. Something like this.

http://www.hobbyking.com/hobbyking/s...ly_6_23v_.html
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Old Jun 07, 2012, 07:11 AM
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I would use a voltage regulator....Servos except the high voltgae type are rated at 4.8V to 6.0V.
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Old Jun 07, 2012, 07:18 PM
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Originally Posted by jetmech05 View Post
I would use a voltage regulator....Servos except the high voltgae type are rated at 4.8V to 6.0V.
Ditto.....
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Old Jun 07, 2012, 07:26 PM
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Ditto all of the above.

I use lipos in all my fuel planes. I use Castle 10A BEC's as the regulator.
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Old Jun 08, 2012, 08:51 AM
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i looked at going the Castle way, but it meant $25 for the 10a bec, $25 for the Castle link, and then the batery.

in the end for this plane at least, (twist 40) i just threw a 1800mAh LiFe 6.6v battery in there. seems to be working great.

i will probably go the lipo way in the future in larger planes.
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Old Jun 08, 2012, 12:43 PM
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I use 3cell lipos in case one quits I still have more than enough volts at 7.4-ish I get my regulators from guy in our club who sells them for 15. default is 5 v with a switch to bump up to 6 v. No frills and work great for a couple years now. Very much worth it when you compare the price of the regulator and 1300 mah battery say 22 bucks compared to a single 4.8v NIMH of comparable mah. Add in easy charging, not having to charge the day before, light weight, etc. I"m never going back.
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Old Jun 08, 2012, 02:33 PM
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...Add in easy charging, not having to charge the day before, light weight, etc. I"m never going back.
But LiPos don't like to be stored fully charged, so surely you should discharge them down to storage level after your flights, and then charge them back up when you want to fly They also need to be supervised whilst charging.

Personally, I find nothing simpler than a 4-cell or 5-cell NiMh pack, overnight slow-charged before each flying session
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Old Jun 08, 2012, 02:46 PM
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When you use a regulator are you in fact "burning off" some of the energy in the pack, and sacrificing some of the weight advantage of the Lipos. Just curious.
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Old Jun 08, 2012, 03:15 PM
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When you use a regulator are you in fact "burning off" some of the energy in the pack, and sacrificing some of the weight advantage of the Lipos. Just curious.
If it's a linear BEC, yes you are converting the excess voltage into heat; but if it's a switching BEC, that's not the case. But no electronic devices are 100% efficient, so you are certainly sacrificing some of the theoretical extra watt-hours.
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Old Jun 25, 2012, 09:08 AM
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Surel adding a lipo + bec is going to make the setup less reliable? More potential points of failure ( connections, BEC robustness ) ...
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Old Jun 25, 2012, 04:30 PM
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I've used tiny lipos on half-A nitro planes, using a 10A ESC (obviously, with no electric motor). It was to power the 9 gram servos only, with a way to protect the 250 mah lipos from being drained too much (ESC would shut down before this happens, just like flying electric motors do). I make sure to change out the lipo each flight or two.
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Old Jul 18, 2012, 11:14 PM
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Not saying you have to agree with the lipo / regulator idea just saying what I switched too.

I'm not concerned about the extra one + ounce of my regulator on a 40 or 60 size glow plane. I dont store them charged. In fact i charge up before I leave in the morning or the night before and leave them where they are when I'm done which is about where the storage volts should be anyway.

I don;t use a switch connecing / disconnecting battery from the reg itself., so there are no add;l connections, In fact I prefer that to the switch and am thinking about going to the arming type connection I have seen advertised.
Mike
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Old Jul 19, 2012, 10:04 PM
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If you leave them where they are, still connected to the regulator, they will eventually discharge completely. Disconnection when not in use is a must.
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Old Jul 21, 2012, 08:14 AM
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You don't need to disconnect if you wire the circuit like this battery, switch, voltage reg, then load( the rest of the plane). The switch can handle the higher voltage, better than the rest of the circuit does. But aben is correct if you place the regulator between the battery and the switch.
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