|09-17-2009, 12:20 AM||#1|
I am: Ben R
Join Date: Jun 2008
Feedback: 1 / 100%
Total Props: 0
R617FS Receiver power??
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I was just getting my last bird together for final finishing (1/4 scale Cub), As I started to buy the servos(2X Hitec HS-805 Mega 1/4 scale , 2X HS-5645 Digital High torque+ one standard for throttle), A123 battery (2X 2300mAh) and Fromeco Failsafe Wolverine Switch...
One question was raise.... Is my RX (Futaba R617FS) can deliver all the current that the servos will draw??? Is ALL that power passing through the RX will fry it ??o I need to add a smart-fly PowerExpander?? How much power (mAh) is the R617FS is built for?? I was told that the new 2.4Ghz Futaba Receiver was build way stronger that the old 72Mhz but how much can it take???
If any one can help me on this one... It's my fist BIG bird an don't want to be under power or burn something on the fist flight !i!i!
Here is some spec on the servos:
HS-5645 RUNNING CURRENT @ 6V: 450mA unload
HS-805 RUNNING CURRENT @ 6V: 800mA unload
X2 of each= 2500mAh... unload! how much can they need loaded??
Futaba 10CAP and 7CAP
Alpha-40 - 1/4 Scale Cub(Sig Kit)
Delta wing W/.61 glow scratch build
P-51 PTS - Thunder Power eXtreme 450 Helicopter
Indoor 3D foamie
Go FASST or Go Home
|09-17-2009, 08:21 AM||#2|
RCC Senior Contributor
I am: Bob R.
Join Date: Sep 2005
Location: Chatham, Ontario
Radio of choice:
Futaba 12FG & Graupner MX-16
Feedback: 6 / 100%
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Re: R617FS Receiver power??
I have never seen a rating on Futaba receivers. It will be interesting to see what people have to say about this. I believe that the connector used to supply the battery power is rated at 5 amps MAX.
22 gauge wire is good for 7 amps ( in short runs as used in models ) so the connector will likely be the limiting factor.
Here is a chart showing the current carrying capacity of printed circuit wiring. http://www.interfacebus.com/PWB_Exte..._Capacity.html
You could measure the width and thickness of the traces between the connector pins to estimate the current carrying capacity.
Estimating the real world current drain of the servos will be the biggest challenge. I guess you could load them to 75% of their rated capacity and measure the current used to move each servo and then add up the total current draw.
Here is a link to a Futaba FAQ that discusses this concern on a 14 channel receiver.
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