Go Back  RCU Forums > RC Airplanes > RC Gliders, Sailplanes and Slope Soaring
Reload this Page >

Can I plug a 7.4 lipo directly into a receiver?

Notices
RC Gliders, Sailplanes and Slope Soaring Discuss rc gliders,rc sailplanes and slope soaring in this forum. Thermaling techniques, airfoils, tips, etc

Can I plug a 7.4 lipo directly into a receiver?

Old 06-23-2008, 05:36 PM
  #1  
Dr.Oates
Junior Member
Thread Starter
 
Join Date: Jun 2008
Location: Antioch, TN
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default Can I plug a 7.4 lipo directly into a receiver?

I have an old micro receiver that I am planning on using with a lipo. The receiver is an old JR R610M.. this will be placed in a 9 oz. DLG and I dont need an ESC.... so how do i go about plugging this thing in? I dont know much about the receivers voltage specs...so I am wondering about how to do this. I'd like to use my Parkzone 7.4 10C 800Mah battery, but it may weigh to much...still the questions remains.... even with a smaller 2S 270mah -2C lipo.... how do i plug it into the receiver?

Old 06-23-2008, 06:11 PM
  #2  
SoarLA45
Senior Member
 
Join Date: May 2006
Location: mara, AB
Posts: 345
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

You either need to connect a micro ESC with BEC to the system or you ahve to use a power regulator. Power regulators are large and are made for giant scale planes where size is not a concern. Do not plug a LiPo directly into the receiver.

If you can find a micro transformer or regulator, use it, if not the Micro ESC will do the job well.
Old 06-23-2008, 09:31 PM
  #3  
Dr.Oates
Junior Member
Thread Starter
 
Join Date: Jun 2008
Location: Antioch, TN
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Thats what i wanted to know... thanks!
Old 06-23-2008, 09:32 PM
  #4  
SoarLA45
Senior Member
 
Join Date: May 2006
Location: mara, AB
Posts: 345
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Try using one of those cheap 5-8 amp ESCs...

Old 06-23-2008, 09:40 PM
  #5  
SoarLA45
Senior Member
 
Join Date: May 2006
Location: mara, AB
Posts: 345
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

GWS sells very cheap ones on Tower

Old 06-24-2008, 07:33 AM
  #6  
Dr.Oates
Junior Member
Thread Starter
 
Join Date: Jun 2008
Location: Antioch, TN
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Thanks Zagiz, out of curiosity what is the voltage for most receivers...is it 4.7 or something close? Ill check into the Bec... i have a small Electrifly, but I got a feeling im gonna run into a weight issue with this. I just remeber back in the day, I would plug my nimh directly to the receiver, but of course the voltage was different.
Old 06-24-2008, 01:49 PM
  #7  
SoarLA45
Senior Member
 
Join Date: May 2006
Location: mara, AB
Posts: 345
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Receivers work on four cell reciever batteries made of NIMH or NICAD. Small ESCs dont weigh much BTW. The votage is 1.5 volts per cell x 4 so it is a six volt battery.
Old 06-24-2008, 03:49 PM
  #8  
tmproff
My Feedback: (5)
 
tmproff's Avatar
 
Join Date: Apr 2002
Location: Humble, TX
Posts: 1,064
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

The votage is 1.5 volts per cell x 4 so it is a six volt battery
Actually, each cell is 1.2 volts so a 4 cell will be 4.8 volts.

You can plug a 5 cell battery (6.0V) into your receiver and your servos will become stronger and quicker. I have a Giant Scale Yak that I use 2 cell Lipo's / BEC to power my receiver.
Old 06-24-2008, 04:36 PM
  #9  
SoarLA45
Senior Member
 
Join Date: May 2006
Location: mara, AB
Posts: 345
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Oh what a [email protected]$$ I am! Of course, reciever batteries are 4.8 not 6 volt.
Old 06-24-2008, 06:09 PM
  #10  
aa2dd
Senior Member
 
Join Date: May 2004
Location: Frostproof, FL
Posts: 486
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?



there were some posts recently, a few weeks ago, about running a 2 cell LiPO directly into the receiver with no regulator. I tried it, and have been flying ever since, using 2 cell lipo with no regulator. For your information, take a voltage check of your 5 cell NIMH or nicad when you first charge it and start flying it. It is well above 6 volts. I seen an ad recently, for I believe, a HItec receiver, and it was rated at 8.4 volts.

Bruce
Old 06-25-2008, 05:36 PM
  #11  
keiko
Junior Member
 
Join Date: May 2007
Location: Mo i Rana, NORWAY
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

a four cell recieverpack will be "flat" when it's 4.8 volts,as will a car battery be flat when it is 12 volts....
I don't know too much about lipos,so I can't say how they are...
hope this was helpfull...
Old 06-26-2008, 08:49 AM
  #12  
tmproff
My Feedback: (5)
 
tmproff's Avatar
 
Join Date: Apr 2002
Location: Humble, TX
Posts: 1,064
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

For your information, take a voltage check of your 5 cell NIMH or nicad when you first charge it and start flying it. It is well above 6 volts. I seen an ad recently, for I believe, a HItec receiver, and it was rated at 8.4 volts.
I agree that a fully charged 5 cell battery will be over 6V, but it will only be in that state for a very short time. I am not so much worried about the receiver than I am about the servos being able to handle above 6V. I think it's a huge risk to plug a 2cell lipo directly into a standard receiver.
Old 06-26-2008, 12:21 PM
  #13  
SoarLA45
Senior Member
 
Join Date: May 2006
Location: mara, AB
Posts: 345
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Some Spektrum receivers have built in LiPo capability so you can use them on giant scale planes and they still deliver normal voltage to servos..
Old 07-01-2008, 06:40 PM
  #14  
mred33
Senior Member
 
mred33's Avatar
 
Join Date: May 2006
Location: Glenwood, GA
Posts: 360
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?


ORIGINAL: keiko

a four cell recieverpack will be "flat" when it's 4.8 volts,as will a car battery be flat when it is 12 volts....
I don't know too much about lipos,so I can't say how they are...
hope this was helpfull...
A 4 cell NiCad will be 3.2 volts when flat, and 4.8 is nominal voltage. Nicads and NiMah's are the same, flat is .8 volts per cell. A LiPo cell is flat at 3 volts per cell. A 2 cell lipo may burn out a receiver and or the servos, so I would not do it. A fully charged 2 cell LiPo will read 8.4 volts and that is to much for most receivers and quite a few servos. You can use a UBEC or an ESC and get 5 volts out of either and no harm will come to your system, but don't try a 2 cell LiPo unless you like to see the smoke come out. By the way, 12 volts out of a car battery is nominal too. That is what you will read under load. That's why they call them 12 volt batteries.
Ed
Old 07-04-2008, 11:00 PM
  #15  
trickydevil
Junior Member
 
Join Date: Jul 2006
Location: CALGARY, AB, CANADA
Posts: 22
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Can I plug a 7.4 lipo directly into a receiver?

Hyper flight in the uk do a small voltage regulator for dlg's.


[link]http://www.hyperflight.co.uk/products.asp?cat=Hyperflight+R%2FC+electric+%26+gl iders&subcat=Electronics[/link]

HtH

Richard

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.