Questions and Answers If you have general RC questions or answers discuss it here.

On board battery charger

Reply

Old 05-08-2008, 03:58 PM
  #1  
spiral_72
Senior Member
Thread Starter
 
spiral_72's Avatar
 
Join Date: Mar 2007
Location: Chesnee, SC
Posts: 511
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default On board battery charger

My guy at the field bought a H9 Cub. It's huge and a very impressive plane. He's having problems with current drain from the ignition system.

I saw an ad for a prop shaft mounted generator that put out a DC voltage to run things or charge batteries on a plane. I can't find or remember where I saw it. I've been on Google and on the forums. It was $99 and come in a pack. I saw the think in a magazine best I remember. I think it fit .60 - 1.20 engines or something. I found one made by Sullivan but it's quite expensive, and one called the "Jewel" made for helicopters.

Any ideas?
spiral_72 is offline  
Reply With Quote
Old 05-08-2008, 09:30 PM
  #2  
ChuckW
Senior Member
 
ChuckW's Avatar
 
Join Date: Jun 2006
Location: Clovis, CA
Posts: 5,165
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

I've only seen the Sullivan generators but I'm sure there are others out there. A cheaper option might be to get a larger capacity ignition battery or maybe run 2 or more in parallel.
ChuckW is offline  
Reply With Quote
Old 05-09-2008, 06:12 AM
  #3  
Flying freak
Senior Member
 
Join Date: Jun 2006
Location: granby, QC, CANADA
Posts: 1,407
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

If hes got the cash go all a123 batteries never a problem no regs and they can supply 60c burst (30c constant)
Flying freak is offline  
Reply With Quote
Old 05-09-2008, 09:59 AM
  #4  
bbbair
Senior Member
 
Join Date: Jan 2003
Location: Belleville, ON, CANADA
Posts: 963
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

If the fellow is having troubles with the current drain ā€“ Iā€™d suggest he finds out why.

It will be a servo that is humming, not correctly centered or too many servos etc. After that the solution is to get a higher capacity battery ā€“ much less expensive and less weight to tow around that an on board generator.
bbbair is offline  
Reply With Quote
Old 05-09-2008, 11:05 AM
  #5  
spiral_72
Senior Member
Thread Starter
 
spiral_72's Avatar
 
Join Date: Mar 2007
Location: Chesnee, SC
Posts: 511
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

Nah, the ignition has it's own battery. Many people have complained about the ignition hogging so much current. I guess Horizon or Hanger 9 is looking into it. But for now, he's kinda stuck.

I believe he's running a 1600mA 4.8 battery for the ignition. It'll suck dry in about 10 minutes.... Ok, not completely dry, but low enough to worry about. That's not even a tank of gas! I mentioned running two on a y-cable, but that still 20minutes with 2hrs of charging.

The Sullivan is still the only one I've found, and I haven't even found anyone who sells it yet. I used all the "where to purchase" links on the Sullivan website.

Guess I'll keep looking. An extra battery is kind of a temporary fix really. Maybe two 2500mA batteries. I don't think the plane will care about the extra weight. It's huge!

I'll look up the a123 batteries too. I'm not familiar with those.
spiral_72 is offline  
Reply With Quote
Old 05-09-2008, 08:42 PM
  #6  
ChuckW
Senior Member
 
ChuckW's Avatar
 
Join Date: Jun 2006
Location: Clovis, CA
Posts: 5,165
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

You might post this in the gasoline engine forum. I remember reading something there once about using a different ignition on the G20 that uses less battery power.
ChuckW is offline  
Reply With Quote
Old 05-09-2008, 08:54 PM
  #7  
DMcQuinn
My Feedback: (13)
 
Join Date: Jan 2002
Location: Chesterfield, MO
Posts: 1,857
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

Spiral - it's almost impossible to drain a 1600 mAh battery in 10 minutes. That implies it is putting out 10 amps continously for 10 minutes. Has he checked the battery with a metered discharger?
DMcQuinn is offline  
Reply With Quote
Old 05-10-2008, 11:51 PM
  #8  
broke_n_bummin
Senior Member
 
broke_n_bummin's Avatar
 
Join Date: Mar 2006
Location: Kershaw, SC
Posts: 838
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger

How old are these batteries? If they're NiCd batteries, it is very possible that they have created the dreaded "chemical memory" and will only allow the battery to drain so far. Invest in NiMH batteries. I would use a minimum 6V 2100 MaH. Also, cycling the batteries will add to their life (even NiMH).
broke_n_bummin is offline  
Reply With Quote
Old 05-12-2008, 12:18 PM
  #9  
spiral_72
Senior Member
Thread Starter
 
spiral_72's Avatar
 
Join Date: Mar 2007
Location: Chesnee, SC
Posts: 511
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: On board battery charger


ORIGINAL: ChuckW

You might post this in the gasoline engine forum. I remember reading something there once about using a different ignition on the G20 that uses less battery power.
Thanks, I'll do it. It really is a nice plane.


For all: Thanks for the posts. I really don't know how old the batteries are. I was under the impression they were new.

My buddy has flown the plane once. He's been working on this and planning for a month (or longer) now. That's a long time for an ARF! He didn't take any short cuts. After the first flight, there was an obvious problem with the ignition current draw. He found some reviews for the plane and confirmed that this was a problem. That's when another guy and I mentioned the on board generator thing.

I'll post this on the gasser forum and let him know about the Sullivan unit. I still haven't found a supplier for it yet. Dern!
spiral_72 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