What's the capacity of a 4.8V 600mAh RX pack?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> What's the capacity of a 4.8V 600mAh RX pack?
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What's the capacity of a 4.8V 600mAh RX pack? - 4/29/2002 10:03:29 AM   
panzer66


 

Posts: 77
Joined: 4/29/2002
From: New York, NY, USA
Status: offline 		Hi, I wonder if a 4.8V 600mAh RX pack could handle 5-6 servos on a .60 size scale plane. I intend to use the airpack on a Top Flite P-47D kit which has retract and flaps in the future.

How many flights will it last? Three or four? Currently, I'm flying a SIG LT-40 trainer (4 servos). A pack like this will have the capacity for at least 5-6 fligts.

In addition, I wonder if I can use a 50mAh charging rate to charge a 4.8V 1000mAh pack. JR recommends a 120mAh charging rate. They offer a different charger for helis. My question is whether I can use a lower, say 50mAh rate, and charge it for a longer time.

Thanks for your information.
       Post #: 1

What's the capacity of a 4.8V 600mAh RX pack? - 4/29/2002 2:18:15 PM   
ks221


 

Posts: 14
Joined: 3/5/2002
From: west aust
Status: offline 		i fly a 4.8v 600maH battery on a 5 servo FF. and have no worries getting 4or 5 flights of up to 10min ,
i think but not to sure on this, correct me any one if im wrong.
at 50mah it will take 20 hours to charge 1000mah pack, the 120mah charger will do it in 8.5 to 9 hours.
there is a way to calculate the mah used during flight but i dunno it, but someone will be able to help u

Battery Clinic:
Know what your system consumes in the way of energy per minute of flight. This can be determined by first charging a pack and then discharging it on a cycler to determine how much capacity it has - fully charged. Then recharge and go fly. Record your system on time and immediately discharge the pack when you return home. This will tell you how much capacity you have left. Lets say you fly for 40 minutes and when you discharge the pack you get 390 mAh. From your initial discharge from a fully charge pack you got 585 mAh. This would mean that you discharged 195 mAh in the 40 minutes you flew or about 5 Ah/min. From this you would know that your pack is good for 116 minutes of flight time under the actual flight loads. Now we don't want to take it this close so give yourself (and your plane) some margin of saftey -25%. So this would set your SAFE flight time to 75% of 116minutes or 1 hour 27 minutes. This should be done for each plane. Also it should be done for your transmitter at least once just to acurately characterize its "flight time". The system usage will vary, depending on your flying style, size of the plane and number of servos used.

< Message edited by Red Scholefield -- Apr 29 2002 10:20AM >

(in reply to panzer66)
       Post #: 2

What's the capacity of a 4.8V 600mAh RX pack? - 4/29/2002 8:07:13 PM   
Jazzy



Posts: 1097
Joined: 1/8/2002
From: Erie, PA, USA
Status: offline 		Personally, I wouldn't put a 600 mAH pack in your TF P-47. Think of it this way: Is your plane worth a couple of extra bucks for a larger pack?
I put 1100 mAH packs in all my .60 size planes. The control surfaces are usually larger and due to increased air pressure when deflected, the servos will draw more current than in your LT-40.

A basic way of determining charge time for a wall wart and a packs is as follows:
Charger output: 50mA
Pack capacity: 1000mAH

1000mAH X 1.5 = 1500mAH
1500mAH / 50mA = 30H

However, since the charger's output is below the C/10 charge rate, 40 hours may be a more adequate charge time.

Check out the Battery Clinic.

_____________________________

Aww $#!^.... I left the )@#& transmitter at home!

(in reply to panzer66)
       Post #: 3

What's the capacity of a 4.8V 600mAh RX pack? - 4/30/2002 6:54:10 AM   
Geistware



Posts: 12946
Joined: 4/9/2002
From: Locust Grove, GA, USA
Status: offline 		I charge 1800maH batteries on the standard wall wart. It just takes a LONG time to charge it. I usually leave it in for 3 days for a full charge.

I have a 600maH pack in a 60 size extra and can get 6 flights with no problem.

_____________________________

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http://www.rcaircraft.net/
Information on the building and flying of Radio Control Aircraft.
Site for hobbyist in the R.C. Aircraft modeling world.

(in reply to panzer66)
       Post #: 4

What's the capacity of a 4.8V 600mAh RX pack? - 4/30/2002 9:27:41 AM   
panzer66


 

Posts: 77
Joined: 4/29/2002
From: New York, NY, USA
Status: offline 		Hi Guys,

Thanks very much for your information. It's really nice to
have RC Universe - a website where I can get some help.

(in reply to panzer66)
       Post #: 5

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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> What's the capacity of a 4.8V 600mAh RX pack?
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