Who using A123 batteries?

[cjcyclesrc]

	Quote: Originally Posted by KrisW
	There is still the problem with routing major current to multiple servo/control surfaces, though. 3 7955's on an Aileron, or 3-4 on rudder, should still have their own voltage supply from a discrete switch, simply because of the limited number of pins on an AR9100 receiver. If you have 3 servos per channel, you will quickly overload the connectors into the AR9100, so external power, from a switch, is still kind of necessary to keep the servos fed and happy. Dual AR9100's might solve the problem, but then you are shelling out $200+ just so you can have another power buss and receiver in the plane, instead of just adding a switch and some wires to provide direct power while tapping into the signal coming off the receiver. If you are using external switches to add additional servo power feeds, it kind of makes the AR9100 setup unnecessary, and you can use almost any receiver you want since you have the power draw isolated from the receiver power buss anyway. It still requires additional feeds on the bigger planes . . . but on 35% birds the AR9100 is a great option.

Yes the AR 9100's are Great on 35%ers. The R1222 would be a better choice in the application you're talking about.

Another option would be to use a seperate battery for the rudder servos and power them through a matchbox. Then run extra power leads from the AR9100 to the wing servos. Then you would have a fail safe switch for the RX and a switch for the rudder.

There are many ways to get it done. The seperation of the power and signals you are talking about would work great also. I personally feel like the AR9100 with 4 Remotes gets a stronger signal than a AR9000.

[littlecrankshaft]

I agree. The AR 9100s are the bomb. On my 40% Carden Extra I run A123s and two AR 9100s with JR 12X aileron mix to provide power between both halves of the airplane. The rudder servos are on a self adjusting arrangement that allows them to be split between the two receivers as well.

This arrangement provides a very good power supply situation while affording completely separate and independent (redundant) control systems in the plane.

[cjcyclesrc]

	Quote: Originally Posted by littlecrankshaft
	I agree. The AR 9100s are the bomb. On my 40% Carden Extra I run A123s and two AR 9100s with JR 12X aileron mix to provide power between both halves of the airplane. The rudder servos are on a self adjusting arrangement that allows them to be split between the two receivers as well. This arrangement provides a very good power supply situation while affording completely separate and independent (redundant) control systems in the plane.

That is a sweet set-up for sure.

[rcbirk21]

i am flying fromeco iron corps packs on my 30% magic hand yak 55. great batts. unregulated through a spektrum 9 channel receiver and 5 hitec 7955tg servos. My only beef is measuring whats left in them after some flights

[Scott Gerber]

Second season on an AR9100, soft switch, single 2300 Mah A123, 7 dig servos and all on HD JR servo leads including charging with a CellPro 4 through HD JR connectors.. Zero issues on a 50cc class plane.

Scott

[billgw]

	Quote: Originally Posted by rcbirk21
	i am flying fromeco iron corps packs on my 30% magic hand yak 55. great batts. unregulated through a spektrum 9 channel receiver and 5 hitec 7955tg servos. My only beef is measuring whats left in them after some flights

Would you post the wiring positions ( polarity ) of your balance connector? Thanks

[rcbirk21]

I actually am not using a balance connector. Kurt from Fromeco put an internal balancer on the packs. It seems to work perfectly as I have three flights a day and have to put in almost nothing back to the batteries.

[billgw]

Thanks, the internal balance is the way to go. I don't have that feature so I better get on the phone and call. Thanks for the reply.

[rcbirk21]

yeah, kurt will get you taken care of. the best way to get in contact with him is pm him here on flyinggiants. his user name is fromeco.

[sportflyer1]

I have been using NiMh for now and would like to change over to A123 .

a) Do I need a voltage regulator for the 2300mah 2S A123 cell pack? Can the Futaba and Hitec servos which are rated at 6V handle a fully charged 2S A123 pack?

b) Can one pack be sufficient of both receiver , servos and ignition ? I am flying only 50cc size planes so my current need is modest . Do I need to add some form of RF choke on the ignition line to prevent noise feedback to the receiver ?

Thanks

[cjcyclesrc]

	Quote: Originally Posted by sportflyer1
	I have been using NiMh for now and would like to change over to A123 . a) Do I need a voltage regulator for the 2300mah 2S A123 cell pack? Can the Futaba and Hitec servos which are rated at 6V handle a fully charged 2S A123 pack? b) Can one pack be sufficient of both receiver , servos and ignition ? I am flying only 50cc size planes so my current need is modest . Do I need to add some form of RF choke on the ignition line to prevent noise feedback to the receiver ? Thanks

A) No Regulator. Yes 6V rated servos are fine

B) It can work as long as you are on 2.4 ghz. I like to just have a seperate ignition pack myself.

[STLAV8R]

	Quote: Originally Posted by rcbirk21
	I actually am not using a balance connector. Kurt from Fromeco put an internal balancer on the packs. It seems to work perfectly as I have three flights a day and have to put in almost nothing back to the batteries.

What is an internal balancer?

[STLAV8R]

	Quote: Originally Posted by rcbirk21
	i am flying fromeco iron corps packs on my 30% magic hand yak 55. great batts. unregulated through a spektrum 9 channel receiver and 5 hitec 7955tg servos. My only beef is measuring whats left in them after some flights

Get the Fromeco Weasel. Displays the mah used in the battery pack.

[rcbirk21]

yeah, but i know i would forget to reset it or i would be stupid and not turn it on. i do plan to eventually get it, but its still nice on other battery types to just plug a voltmeter in to check it.

An internal balance is a little computer chip that comes on every 5 seconds in this case and checks the balance of the cells. if they are fairly unbalanced, it will direct the voltage to be used from the higher voltage cells until they are balanced. if they are balanced, it simply goes back asleep. kurt told me that they are very low use, so they do not suck hardly any voltage out of your battery pack, so no worries aobut that.

[STLAV8R]

I also noticed that if you unplug your batteries (like me) at the end of the day, when you replug them in, it can reset them to zero.

The internal balancer sounds interesting. Where is it on the web site?

	Quote: Originally Posted by rcbirk21
	yeah, but i know i would forget to reset it or i would be stupid and not turn it on. i do plan to eventually get it, but its still nice on other battery types to just plug a voltmeter in to check it. An internal balance is a little computer chip that comes on every 5 seconds in this case and checks the balance of the cells. if they are fairly unbalanced, it will direct the voltage to be used from the higher voltage cells until they are balanced. if they are balanced, it simply goes back asleep. kurt told me that they are very low use, so they do not suck hardly any voltage out of your battery pack, so no worries aobut that.