R617FS Receiver power?? - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Electronics Discuss radios, chargers, etc...

Closed Thread
Thread Tools Display Modes
Old 09-17-2009, 12:20 AM   #1
RCC Apprentice
benz30's Avatar
I am: Ben R
Join Date: Jun 2008
Location: Laval

Feedback: 1 / 100%
Posts: 80
Total Props: 0
Question R617FS Receiver power??

       Remove this ad - become a site supporter!
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??

M.A.A.C. 78164
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

benz30 is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 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%
Posts: 572
Total Props: 5
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.

bobreib is offline   Quick reply to this message.
Old 09-17-2009, 08:22 AM   #3
I am: Boolean21
Join Date: Sep 2002
Location: Singapore

Feedback: 0 / 0%
Posts: 38,228
Total Props: 56
Re: R617FS Receiver power??

You will be fine with that Rx and servos.
PurgatorY is offline   Quick reply to this message.
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Your Name
Your first name and last initial is required if you plan on using the forum.
Which city & province you live in. This is mandatory for classified listings.
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
vBulletin Message

Thread Tools
Display Modes

Forum Jump

All times are GMT -5. The time now is 05:22 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.