What do I need for my electronics?

[airsiler]

I am about to start work on a 35% 260 and was wondering what kind of power expander do I need? I will be using the 2.4 radio gear. I have read about some people having trouble with losing power to the receiver or something to that affect. I will also be using Hitec servo's. What kind of batteries should I use?

[Hawk-i]

I've flown the following set up for 2 yrs in IMAC using a similar plane with 7 - 8611a servos. I've got about 300 flights to back up my recommendation.

two 6v, 4/5 A cell, low impedance, 1950 mah, NiMH packs (from NoBS Batteries) ran through 2 JR heavy duty switches directly into a 9ch RX.

I used a similar 6V pack ran through a HD switch on the ignition.

This keep-it-simple set up is good for about 5 to 6 flights of IMAC sequence practice - WARNING your mileage may vary. I have no experience with LiIon nor power expanders so I won't comment other than to say I think they can do the job if wired up properly. I do plan to test the A123 cells over the winter. They don't require requlators so that fits my KIS approach.

Hope this helps and regardless what provides the juice use that batt load tester.

[Drimalitis]

I think you have to use LiPo-Lion batteries especially for 2.4Ghz system.
From what I’ve read when the power drops down the Rx probably shot down. If you use a NiMH or Nicd batteries even if they are full charged when you …push the servos they draw plenty of power. In that second the voltage may drop enough to shot down the receiver. If you use Lipo batteries with regulator or another electronic circuit the voltage still same at any time.
On my 33% Hangar9 Extra and on 35% Composite ARF …Extra I use powerBox evolution with two Lipo powerBox batteries 2800mha. Yesterday I make 4 flights, the day before 3 and tomorrow I hope more than 5. All with one charge.
I hope you understand me (my English are not very good).

[airsiler]

Thanks guys for the response. I am very new to all the new technologies that are available for the big airplanes now. Want to buy correct the first time.

[djbullseye111]

I am also going to begin a 35% build as soon as I get what I want narrowed down. As far as electronics go, I'm pretty much set on 2 2600mAh fromeco's into a smart fly turbo regulator and power expander eq10. I'll probably be running (8) 8611a's and a 2.4gHz radio and as far as I can tell this seems to be a great way to keep the voltage from dropping below the reboot range. The turbo reg. keeps the current drain equal over the two batteries plugged into it and the power expander allows multiple servos to be connected to each channel on the reciever.
Hope I helped more than I confused!
Good luck with your build!

DJ

[exeter_acres]

	Quote: Originally Posted by airsiler
	what kind of power expander I need?

None... Your system would work fine without one...

if you WANT one.. then fine, but you do not NEED them..

IF it were mine, I would do two Fromeco 2600 or 5200 LiIon packs (the bigger pack would add a bit of weight, but you could fly all weekend)
each into a switch, into a regulator, into your RX (each reg would have at least 2 outputs... plug them into available channels or "Y" them with others...)

[Drimalitis]

Hi again!
Perhaps Exeter_acres is right.
But when you do a .. hard snap roll for example the servos will draw almost all the power they need. So if you have 8x JR 8611 the power they need is more than 10-15Amps (2.8Amps each stalled). I’m not sure if the Rx can handle this power. Maybe yes but I don’t want me to make this experiment.
But you have cheaper solutions. You can use just an Isolator. Is not only the power that they can handle. They do many other things like battery backer, signal amplifier etc..
Have a good …landings.

[Pale Rider]

My vote would be for 2 2s A123 packs--they can handle 40+ amps with ease--

[Drimalitis]

Pale Rider the question is if the Rx can handle 40+ Amps. What do you think about this? This is what our friend Airsiler asking for. I agree with A123 .

[Pale Rider]

Good question--I dunno-- but if you are drawing that much power then Im thinking something is wrong
Nothing wrong with a PE but guys have been flying without them just fine too--

[Imac Kiwi]

	Quote: Originally Posted by airsiler
	I am about to start work on a 35% 260 and was wondering what kind of power expander I need? I will be using the 2.4 radio gear. I have read about some people having trouble with losing power to the receiver or something to that affect. I will also be using Hitec servo's. What kind of batteries should I use?

I would use 2 Fromeco Li-ion 2600 packs through the new Smartfly "Sport Power System". This has a regulator and ign cut-off built into the power expander.

The EQ 10 is not required as you are using Hitec servos that can be programmed if necessary.

[airsiler]

OK, I understand you can program the Hitec servo's with there programming box. I also read that with the EQ10 you can match the servos as well? So I can pay the money for the Hitec programming device, or I can pay a little extra for the EQ10 and let it do the servo matching. As I said I am new with all of this stuff so I might not be correct with my thinking, and if so please let me know. I have been out of flying for some time know, and am really looking forward to building the plane and then getting back to flying again.

What about the differences between the Smartfly and the Duralite bower boxes? Any bad experiences with one or the other?

[exeter_acres]

or you can set your linkages up mechanically proper and not need any matching device.....