Its too windy to fly here on the east coast of Florida, so maintanence
time. (Yes, I know, what a wimp. I can and have flown contests in pretty
bad wind but why risk a plane when there will be better days soon.) The
question is about batteries. I need to replace a number of sailplane
batteries.
Personally I'd recommend the 1100MAH NiCd. They have plenty of capacity
for thermal duration. Although I own and use NiMH batteries I prefer
nicads for receiver packs.
Either technology will do but in either case be SURE to do a FORMING charge
FIRST. Don't get new cells and start quick
James,
Actually, sailplanes can draw quite a bit of power, especially 6ch
planes with digital servos. I have long been convinced that the reason
for many crashes is due to catastrophic voltage drop-offs caused by
high current loads. If you've ever seen a plane that was thoroughly
Jim Laurel wrote:
James,
Actually, sailplanes can draw quite a bit of power, especially 6ch
planes with digital servos. I have long been convinced that the reason
for many crashes is due to catastrophic voltage drop-offs caused by high
current loads.
FWIW I have calculated that my average
@airage.com
Cc: James R MacLean [EMAIL PROTECTED]
Sent: Sunday, April 17, 2005 9:07 PM
Subject: Re: [RCSE] battery choices
James,
Actually, sailplanes can draw quite a bit of power, especially 6ch planes
with digital servos. I have long been convinced that the reason for many
crashes is due
-
From: Rick Eckel [mailto:[EMAIL PROTECTED]
Sent: Sunday, April 17, 2005 1:53 PM
To: James R MacLean; soaring@airage.com
Subject: Re: [RCSE] battery choices
Personally I'd recommend the 1100MAH NiCd. They have plenty of capacity
for thermal duration. Although I own and use NiMH batteries I
On Sun, Apr 17, 2005 at 09:55:41PM +0200, Stefan Smets wrote:
| Hmm, this tread got me thinking about the batteries I use ... How
| can one know the impedance? I'm using Duracell AA cells with these
| data on them AA/HR6/DC1500NiMH/1,2V/2050mAh.
Ultimately, you'd measure the voltage produced by
James,
I have just read this thread and there is a lot of very good
information being passed. I prefer NiCd's wherever I can, I will use NiMH
cells if I need to keep the weight down only. There a lot of NiMH cells
coming out that are of poor quality, and some of them will NOT take a fast
I've found that the best and most convenient choice for AA receiver packs are
the Energizer 2300 or 2500 MAH NiMh cells available from local department
stores for around $10 per four-pack. I use them in all my sailplanes and
radios and have never had a pack come close to reaching a discharged
The modern digital servos can draw more than 1 amp at stall.
George, you are confusing stalled with fully deflected under load. The
JR 368 has a full stall current of 1 or 1.1 amps. Can't pull more than
that or it will fry. The flaps are NOT stalled when loaded under full
deflection, and
No Way!! For the same package size decent (Sanyo) nicads have higher terminal
voltage under load, lower internal resistance, faster dependable charge and
discharge rates and a much longer charge retention time.
I will admit that NiMH cells have more capacity per volume than NiCads but you
must
I've been flying with NiMH flight packs since starting in this game
(about 5 years ago) with open-class ships. The 1600-ish sized packs
seem to be the sweet spot for hydrides with regard to consistent
performance. The 2000 and above packs are (I think) pushing the limits
of capacity in the
Hi James,
NiCD's will deliver the most PWR on demand, but offer the least watt/Kg.
THis may require recharging at some point in the day.
AA NiMH's have significantly higher internal resistance (lack of
reactive surface area in the form factor), and will demonstrate a lower
voltage under a
Consumer grade batteries fall short in a number of areas:
- poor construction, do not meet the same vibration/drop test
specifications as industrial cells
- poor electrical performance, significantly higher internal resistance
than the worst of the industrial offerings
- exagerated specs to meet
14 matches
Mail list logo
