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HomeAircraftHelicopterHelicopter Main Discussion › Which Receiver pack is right for me?
02-20-2013 03:37 AM  5 years agoPost 1
Jonnybegood

rrNovice

Georgetown, TX

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Welcome Ladies and Gents, I have a small but very important question.
I just received my TRex 700N DFC super combo, DX8 Transmitter and 0.S .91HZ-R 3D Motor. I would like to hear what kind of receiver packs everyone is using on there Heli's. I will not be doing 3D (YET) just smooth flying for now. thanks for your time. (Leaves stage)....

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02-20-2013 04:11 AM  5 years agoPost 2
mustang67ford

rrKey Veteran

Central Pennsylvania

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I run 4.8v NIMH packs which are 4 AA. I recently went thru a debate on changing to 6v packs. 6v definitely have their advantage, but what kept me at 4.8v was info on futaba's website. Futaba noted that operating their equipment at 6v reduces the life of the equipment. After reading that, I decided to stay at 4.8v and just replaced a nicd with a new NIMH. Also, like to keep my packs permanently installed in my helis. If you go lipo with a regulator, you can swap packs around between helis.

Team HeliProz - Retired
AMA #513507
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02-20-2013 04:37 AM  5 years agoPost 3
Aaron Hartwell

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Duvall, Wa.

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I just built my first nitro after flying large'ish Trex helis. Because I only speak LiPo and have tons of batteries and a really nice charging set-up, I went with a 7.4v 5000 mah battery and used a castle BEC to step down the voltage. It works like a champ. I flew around 5 tanks through the other day and when I tested the rx pack I still had over 4 volts on each cell.

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02-20-2013 10:14 AM  5 years agoPost 4
McKrackin

rrProfessor

Lucasville,Ohio

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I use a 3200mAh LiFe pack.
Easily 8 flights per charge.

I never take it off the heli.Never unplug it since I have a power switch.

I charge it on the heli since LiFe packs don't catch fire.

I use a cheap LiFe charger.

The pack and charger are Life Source from Tower.

I literally never use the word literally right.

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02-20-2013 01:14 PM  5 years agoPost 5
Four Stroker

rrElite Veteran

Atlanta

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Hey, go with McKrackin or get an A123. AA pack completely inappropriate in a 700.

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02-20-2013 01:26 PM  5 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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There was a time when I switched over to new 2.4 GHz stuff from my older 72 MHz radios where I continued to use 4.8V Nicads or NiMh packs to provide power to my electronics. But then I was flying 50 sized helis with servos that were adequate, but not in the same speed and torque class that is generally available today.

Fast forward four or five years, times have changed. If you are building a 700 anything today, you are generally going to be using high torque, high speed servos whose current demands can be relatively large. Further, you have a CCPM heli where at least three servos will be drawing current simultaneously, with a tail rotor servo that may or may not be moving at the same time.

You are also building a DFC heli, meaning that you are going flybarless. This puts an even heavier demand on your batteries and their ability to deliver adequate power to the system.

From your DX8 manual comes the following advice:
Recommended Power System Guidelines

1. When setting up large or complex aircraft with multiple high-torque servos, use a current and voltmeter (HAN172). Plug the voltmeter in an open channel port in the receiver, and with the system on, load the control surfaces on your aircraft by applying pressure with your hand. Monitor the
current as you load control surfaces. The voltage should remain above 4.8 volts even when all servos are heavily loaded.

2. With the current meter inline with the receiver battery lead, load control surfaces while monitoring the current. The maximum continuous recommended current for a single heavy-duty servo/battery lead is 3 amps. Short-duration current spikes of up to 5 amps are acceptable. If your system
draws more than these currents, you need to use multiple packs of the same capacity with multiple switches and multiple leads plugged into the receiver.

3. If using a regulator, perform tests for a 5-minute period. A regulator may provide adequate short-term power, but this tests its ability to maintain voltage at significant power levels over time.

4. For really large aircraft or complex models, multiple battery packs with multiple switch harnesses are necessary. No matter what power systems you choose, always carry out test #1. Make sure the receiver is constantly
The Spektrum receivers will operate down to 3.5 volts, however, it only takes a very short duration voltage droop to cause your receiver to stop working and have to reset itself when power is restored to proper voltage.

The parts above highlighted in blue pretty much say DO NOT USE a 4-cell 4.8 volt nominal battery pack.

I would highly recommend AGAINST using a 4.8 volt Nicad or NiMh pack as you are simply asking for trouble. Your best bet is to either use the 6.6 volt LiFePo4 packs as recommended, or bite the bullet and use a 2S LiPo with a regulator.

If you're using Futaba servos rated for 4-cell packs, they are generally good to operate at up to 5.8 volts.

If you truly value your helicopter and the investment you have in it, don't cheap out on your battery. A 1900 mah or greater 2S LiPo coupled with a good regulator set to output 5 to 5.8 volts will keep your servos, receiver, and FBL controller very happy.

The Align 2 N 1 regulator would be a useful choice, as would a Castle Creations BEC Pro. Western Robotics is said to make good regulators. Shop for something with at least 6 amps of continuous output power capability.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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02-20-2013 01:46 PM  5 years agoPost 7
jschenck

rrProfessor

La Vista, NE.

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My Trex 700n has had a 3000MAH LiFe pack since 2009 - works great. No switch, no regulator, great performance.

I would highly recommend against AA NiMH packs. They are high internal resistance and can fall in voltage with the powerful digital servos pulling from them causing the digital RX to "reboot".

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02-20-2013 02:15 PM  5 years agoPost 8
Jonnybegood

rrNovice

Georgetown, TX

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Thank you everyone for the responses, The Heli kit did come with the Align 2in1 regulator. I will do some more searching but according to these posts i will most likely get a 2s lipo.

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02-20-2013 03:03 PM  5 years agoPost 9
GetToDaChopper

rrElite Veteran

Las Vegas , NV

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the one that fits all your needs..........

    ▲
  ▲ ▲
▲ ▲ ▲ One of a Kind !!!

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02-20-2013 09:02 PM  5 years agoPost 10
Wedge77

rrVeteran

St. Charles Missouri USA

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question on the life packs, I used the same life pack Mccrackin is using, but after looking at it, and realizing it is opnly 10-c, i was leery of putting it into a 700 size machine.. any reason for concern here?
Wedge

JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell

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02-20-2013 09:54 PM  5 years agoPost 11
heli eddy

rrNovice

galena, ohio

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I like just to run straight 2s lipo
For a 700 you can go with 3000 or so
If you are running ds 610 then you can run 2s lipo even though they are not rated for them
I have 4 sets of align 610s and run them on 2s with no problem

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02-20-2013 10:08 PM  5 years agoPost 12
Mikerobe

rrVeteran

Green Turtle Cay,Abaco, Bahamas.

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Can I use a Life with futaba servos rated at only 4.8 volts? I heard of folk not using any regulator etc.

The lot I got is not a lot, but I thank God a lot for the lot I got!

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02-20-2013 11:10 PM  5 years agoPost 13
dkshema

rrMaster

Cedar Rapids, IA

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I used the same life pack Mccrackin is using, but after looking at it, and realizing it is opnly 10-c, i was leery of putting it into a 700 size machine
McCrackin is using a 3200 mah LiFe pack. That 3200 mah is 3.2 Amp-hours. 10C rating says that pack will safely deliver 3.2 x 10 or 32 Amps. I would suspect that if you are flying electronics that draw more than 32 amps continuously, you have a real problem.

3200 mah 10C rated pack is absolutely fine for the application.

-----

Can I use a Life with futaba servos rated at only 4.8 volts? I heard of folk not using any regulator etc.

As I think I stated somewhere above, most Futaba servos rated for 4.8 volt operation are good up to 5.8 VDC. Pushing those to run from 6.6 volts unregulated, in my opinion, is a recipe for a not-so-productive day of flying.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-06-2013 08:31 PM  5 years agoPost 14
Wedge77

rrVeteran

St. Charles Missouri USA

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dkshema,
thasnks for the post, I was a little concerned, but Ill keep on using the life packs.

JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell

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03-06-2013 09:05 PM  5 years agoPost 15
datidun

rrElite Veteran

N Ireland

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I agree there it would be a matter of time before your 4.8v servos retire big time,all my helis have life packs 6.6v except one which still has a 4.8v nimh pack eneloop 2500 mah,im running it with good old 9252 servos probably one of the best 4.8v servos out and its flawless flies great,usually have 3 flights,Trex 600 pro,other option you could use a sub C nimh pack,this is all provided that you are not using very high torque servos.

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