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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › Best Battery power system for FBL 700
04-06-2012 02:51 AM  9 years ago
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DEDO

rrApprentice

FREDERICA, DE.

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Best Battery power system for FBL 700
I just built a 700 HeliBug. All servos are 6v rated, SPEKTRUM H6040 and a SAVOX SH1290mg on the tail. What would be the best way to power this birds electrical system? thanks guys.
Peace Out BOBBY D.
"GOBLIN PRo GASSER"
ZeN G290,HC3SX,MKS,
Maidened 8/24/12 FL
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04-06-2012 04:28 AM  9 years ago
jsenicka

rrProfessor

Eagle River, WI

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I am a big fan of LiFePo4 packs.
I run Hyperion LiFe 3000mah packs on my 700N's and 600N's.
The Hyperion, or LiFeSource packs are great
Jim Senicka
Team Manager, GrandRC Flight Team
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04-06-2012 06:11 AM  9 years ago
DEDO

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FREDERICA, DE.

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I was thinking about using a life type battery. Do you use a regulater are just a switch harness. I am using a Cgy 750 and worried that just the S BUS cable is not going to supply enough power to all servos. Are does it?Peace Out BOBBY D.
"GOBLIN PRo GASSER"
ZeN G290,HC3SX,MKS,
Maidened 8/24/12 FL
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04-07-2012 12:53 AM  9 years ago
Heliosprime

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NY,

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No regulator needed with the LiFePo4 packs Machete, don't text!
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04-07-2012 02:25 PM  9 years ago
NitroAl

rrApprentice

Gold Coast Aus

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No need for a reg with those servo's, They have proven themselves on 2s LiPo!
I wouldn't count on one servo lead to carry enough current for the entire system, especially with FBL!
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04-07-2012 03:12 PM  9 years ago
Kaborkian

rrNovice

Lafayette, LA USA

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All this talk about servo power though an sbus cable, and no supporting evidence....

A foot of 24 awg wire has a resistance of .026 ohms. Servos can spike to an amp or so. 5 amps across 0.026 ohm is a voltage drop of about 0.13 volts. Using a 6.6v life, that means it will drop to 6.5v or so at the 750 controller. No problem.

Even if it were 10 amps, the drop would put you down to 6.4v, still no problem.
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04-07-2012 03:14 PM  9 years ago
Kaborkian

rrNovice

Lafayette, LA USA

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On and I assumed a 24 awg cable. Not sure but the sbus may be 22 awg, which would cut the resistance to 0.016 ohms and change the voltage drop to about 1/2 of my numbers above,
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04-09-2012 07:57 AM  9 years ago
NitroAl

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Gold Coast Aus

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That's just the wire, what about the header pin and connector? Once you exceed 6 amps those voltage drops are going to increase dramatically and with no over head for the unexpected!
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04-09-2012 08:16 AM  9 years ago
westwindpilot

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Las Vegas, NV

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I agree with the life batts. Been using one for a long time.
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04-22-2012 04:24 AM  9 years ago
McKrackin

rrProfessor - Lucasville,Ohio MyPosts All  Forum  Topic

My 700N has a V Bar,three 8717's,a 9256 and an old cheap Spektrum throttle servo...

I use a tiny 2S LiFe pack(1500 mAh).

Also has a Jewel Generator so I can get nearly unlimited flights on a single charge.

I literally never use the word literally right.
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04-22-2012 05:22 AM  9 years ago
rilopez825

rrVeteran

Pembroke Pines, FL

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Not sure you can do this with the 750 but I have a deans on the battery and two servo extensions to it. Then I just plug it in to two ports on my vbar.Richard
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