RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

li-po for reciever and trans???

Reply

Old 06-27-2007, 08:50 AM
  #1  
Dwaine
Junior Member
Thread Starter
 
Join Date: May 2006
Location: st louis park, MN
Posts: 28
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default li-po for reciever and trans???

I was wondering what li-po to use? do i use a resister?
Adam Drake uses them for both. Sounds like a good idea. please help
Dwaine is offline  
Reply With Quote
Old 06-27-2007, 09:48 AM
  #2  
piper_chuck
My Feedback: (12)
 
piper_chuck's Avatar
 
Join Date: Jun 2004
Location: Columbia, SC
Posts: 8,039
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

you need a voltage regulator. However, given the issues with lipos, I would never use them in a plane or a transmitter. Lithium Ion, maybe, but not lipo.
piper_chuck is offline  
Reply With Quote
Old 06-27-2007, 03:57 PM
  #3  
Gulliver
Senior Member
 
Join Date: Aug 2004
Location: Boulder, CO
Posts: 275
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

According to Don Schulman, all transmitters have a voltage regulator that will handle 15v. I have been running a 3-cell Lipo in my Futaba 9C for a couple of years now with no problem.

Running receivers over 6v is problematical, however. You need a regulator and preferably a 2-cell lipo pack.
Gulliver is offline  
Reply With Quote
Old 06-27-2007, 08:20 PM
  #4  
Wlouigene
My Feedback: (66)
 
Join Date: Oct 2003
Location: Coral Springs, FL
Posts: 100
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

I have been running a 3-cell Lipo in my 9303 with no problem and all my plane and heli have lipo
http://www.grandrc.com/inc/sdetail/50357
http://www.troybuiltmodels.com/LiIonBatteries.htm
Wlouigene is offline  
Reply With Quote
Old 06-27-2007, 08:23 PM
  #5  
JNorton
My Feedback: (2)
 
JNorton's Avatar
 
Join Date: Jan 2002
Location: Coopersville, MI
Posts: 4,326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

Given the fact that at least once a season I either leave the transmitter or a receiver pack on I'll stick to my NiCads! Do it with a Lipo pack and you'll be replacing it. I usually only fly for 4 hours or so at a time so the longer life the Lipo pack offers doesn't matter to me. The ability to put the pack on a C/10 charge for 16 hours and have it perform like new is worth the extra weight. I'm only a sport flyer so I don't care about shaving a few ounces off the airplane. Your mileage may differ.
John

PS Gulliver
According to Don Schulman, all transmitters have a voltage regulator that will handle 15v.
Given todays cost cutting programs I certainly wouldn't take that advice to the bank. I'm not saying your 9C doesn't have a built in regulator but I certainly wouldn't give it a blanket statement like that.
JNorton is offline  
Reply With Quote
Old 06-27-2007, 08:40 PM
  #6  
Wlouigene
My Feedback: (66)
 
Join Date: Oct 2003
Location: Coral Springs, FL
Posts: 100
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

Given the fact that at least once a season I either leave the transmitter or a receiver pack on I'll stick to my NiCads! Do it with a Lipo pack and you'll be replacing it.
You need to be careful; you would not leave your stove on for a season, why would you leave your receiver on. I know these things are toy but you need to be careful with them as with anything else
Wlouigene is offline  
Reply With Quote
Old 06-28-2007, 04:39 AM
  #7  
JNorton
My Feedback: (2)
 
JNorton's Avatar
 
Join Date: Jan 2002
Location: Coopersville, MI
Posts: 4,326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

Bad analogy. A stove gives off heat. Pretty darn obvious that you left it on, yet people burn their houses down doing it. Nothing shows if you leave a transmitter or a receiver on. If you haven't done it you will. Obviously if I leave only one or the other on in a 4 months time frame it's not like I'm not being careful. Besides I don't own any toy airplanes. At $400 to $2000 a copy it more like an obsession than a toy.
John

PS EDIT -> Ever leave a basement light on all night? It usually happens when I'm shooting the bull with some of the guys. It interupts my routine and I forget to turn the darn thing off. Usually at the end of the nights flying when I run the fuel out and start the engine up to clear it of any left over fuel in the tank.
JNorton is offline  
Reply With Quote
Old 06-28-2007, 08:37 AM
  #8  
pilotpete2
 
pilotpete2's Avatar
 
Join Date: Oct 2002
Location: Lyndonville, VT
Posts: 3,298
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

Hey John,
If the new Sanyo Eneloop cells are as good as some are saying, then we may come to the day when if the question is raised of using lipos in a Tx, it will be met with, You want to do what??!!
pilotpete2 is offline  
Reply With Quote
Old 06-28-2007, 08:49 AM
  #9  
rmh
Senior Member
 
rmh's Avatar
 
Join Date: Dec 2001
Location: , UT
Posts: 12,630
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

the 2.4 DX7 tx comes with a large NiMh--will fly all day - yet people persist in putting in LiPos - go figure
I left my DX7Tx on - (what else is new ). plugged the ol wall wart in - the next day back in business-- no issues .
as for the rx -- 2 A123 cells beat anything power wise, weight wise, reliability and instant current -no reg needed.
but
having a setup which will "run all weekend" means more to some - even if the reg or cells go up in smoke
What's up with that?
rmh is offline  
Reply With Quote
Old 06-28-2007, 09:16 AM
  #10  
Rafael23cc
My Feedback: (6)
 
Rafael23cc's Avatar
 
Join Date: May 2002
Location: Junction City, KS
Posts: 2,957
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

All of you missed the point that the original poster is a car racer.

If that even matters to some of you. Some of your points are valid, some of your points do not apply as not all radios are made the same, specially car radios.

Rafael
Rafael23cc is offline  
Reply With Quote
Old 06-28-2007, 10:37 AM
  #11  
JNorton
My Feedback: (2)
 
JNorton's Avatar
 
Join Date: Jan 2002
Location: Coopersville, MI
Posts: 4,326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

What difference does having a car transmitter or receiver bear upon the fact that a LiPo will be toast if it is left on? Not trying to be a smart a** I just don't see the differece?
John
JNorton is offline  
Reply With Quote
Old 06-28-2007, 11:18 AM
  #12  
Rafael23cc
My Feedback: (6)
 
Rafael23cc's Avatar
 
Join Date: May 2002
Location: Junction City, KS
Posts: 2,957
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

You ask:
ORIGINAL: JNorton

What difference does having a car transmitter or receiver bear upon the fact that a LiPo will be toast if it is left on? Not trying to be a smart a** I just don't see the differece?
John
I said:
Some of your points are valid...
Why would you argue?

I just wanted to bring the discussion back onto subject. RC Car radio subject.

Rafael
Rafael23cc is offline  
Reply With Quote
Old 06-28-2007, 11:42 AM
  #13  
Panzlflyer
Senior Member
My Feedback: (15)
 
Panzlflyer's Avatar
 
Join Date: Feb 2002
Location: Goldsboro, NC
Posts: 1,960
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

I think A123s for the car....although the original poster is far from specific
I use Eneloops for the transmitter (Car)as they stay charged as advertised and the usual 1500 in my DX7.
Panzlflyer is offline  
Reply With Quote
Old 06-28-2007, 11:48 AM
  #14  
Rafael23cc
My Feedback: (6)
 
Rafael23cc's Avatar
 
Join Date: May 2002
Location: Junction City, KS
Posts: 2,957
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

He was specific enough:
Adam Drake uses them for both.
If you rub elbows with car racers you know who Adam Drake is. Just like if you rub elbows with heli pilots you know who Alan Szabo and Curtis Youngblood are. Quique Somenzini comes to mind when you say airplanes.

Doesn't matter, let's go back to the subject.

Rafael
Rafael23cc is offline  
Reply With Quote
Old 06-28-2007, 12:28 PM
  #15  
piper_chuck
My Feedback: (12)
 
piper_chuck's Avatar
 
Join Date: Jun 2004
Location: Columbia, SC
Posts: 8,039
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

ORIGINAL: Rafael23cc

He was specific enough:
Adam Drake uses them for both.
If you rub elbows with car racers you know who Adam Drake is.
Gosh, how could people have missed something so obvious?
piper_chuck is offline  
Reply With Quote
Old 06-28-2007, 12:52 PM
  #16  
Dwaine
Junior Member
Thread Starter
 
Join Date: May 2006
Location: st louis park, MN
Posts: 28
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

i get the point though everyone. thank you.. planes or cars if i forget, i'm buying new li-po's.
Does enypone know if there is a programable failsafe. so i could choose the voltage cutoff..
I think the spectrum transmitter has one but i'm not sure..
Dwaine is offline  
Reply With Quote
Old 06-28-2007, 01:03 PM
  #17  
Dwaine
Junior Member
Thread Starter
 
Join Date: May 2006
Location: st louis park, MN
Posts: 28
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

I'm thinkin of building an hpi savage out of as much carbon fiber as i can find.
I was thinkin of ways to save weight. thats why i was wondering about a single cell li-po.
Dwaine is offline  
Reply With Quote
Old 06-28-2007, 05:37 PM
  #18  
JNorton
My Feedback: (2)
 
JNorton's Avatar
 
Join Date: Jan 2002
Location: Coopersville, MI
Posts: 4,326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???


ORIGINAL: Rafael23cc

You ask:
ORIGINAL: JNorton

What difference does having a car transmitter or receiver bear upon the fact that a LiPo will be toast if it is left on? Not trying to be a smart a** I just don't see the difference?
John
I said:
Some of your points are valid...
Why would you argue?

I just wanted to bring the discussion back onto subject. RC Car radio subject.

Rafael
LMAO Car forum http://www.rcuniverse.com/forum/forumid_201/tt.htm
The point was whose points are valid? I'm certainly glad you realized it was a car question. I sure didn't. I sure don't understand the electrical power requirements ie differences between car and plane transmitters either. Course I'm only an EE and didn't spent the night in a Holiday Inn either.
John
JNorton is offline  
Reply With Quote
Old 06-29-2007, 09:03 AM
  #19  
Rafael23cc
My Feedback: (6)
 
Rafael23cc's Avatar
 
Join Date: May 2002
Location: Junction City, KS
Posts: 2,957
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

I sure don't understand the electrical power requirements ie differences between car and plane transmitters either.
Me either, that is why I was watching this topic.

People here were talking about Futaba 9C and 9303 that are without a doubt more complex radios than a car radio. As to how they work internally I have no clue. All I care is that I have control over my helis, airplanes and cars when I flip the switch. Be it from a LiPo battery, a NiCd, a NiMh, or a LiIon.

If anyone has problems with leaving your radio turned on after flying, that person needs a better safety check list than what you have right now. I bet that that person has had some full throttle starts or radio off starts too. Need I say that in helicopters, that is particularly dangerous?

Rafael
Rafael23cc is offline  
Reply With Quote
Old 06-29-2007, 09:39 AM
  #20  
rmh
Senior Member
 
rmh's Avatar
 
Join Date: Dec 2001
Location: , UT
Posts: 12,630
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

You have never had these things occur ?
Fly long enough - it will happen.
rmh is offline  
Reply With Quote
Old 06-29-2007, 11:05 AM
  #21  
Rafael23cc
My Feedback: (6)
 
Rafael23cc's Avatar
 
Join Date: May 2002
Location: Junction City, KS
Posts: 2,957
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

Many years ago, I had one hot start on a heli after I switched from a JR servo to a Futaba servo. They have their movements reversed.

After that I sold the 30 sized helicopter and got myself a 50 and a 90. Those will get your attention real quick. If not, irreversible damage could occur.

Knoing that, I'm pretty cautious on the way I do my pre- and post flight checks.

we are strying away from the subject at hand. What was the concensus? You could do it on the TX, but on the RX you need a regulator, right?

Rafael
Rafael23cc is offline  
Reply With Quote
Old 06-29-2007, 11:25 AM
  #22  
rmh
Senior Member
 
rmh's Avatar
 
Join Date: Dec 2001
Location: , UT
Posts: 12,630
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

why not ?
in for a penny
in for a pound-
My own feelings?
NFW
rmh is offline  
Reply With Quote
Old 06-29-2007, 07:18 PM
  #23  
pilotpete2
 
pilotpete2's Avatar
 
Join Date: Oct 2002
Location: Lyndonville, VT
Posts: 3,298
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: li-po for reciever and trans???

ORIGINAL: dick Hanson

You have never had these things occur ?
Fly long enough - it will happen.
Very true, and while were on the topic of leaving a Tx turned on "got simulator", Getcha real easy.
Pete
pilotpete2 is offline  
Reply With Quote

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