John,
that is really interesting. Have you sampled more than one battery or repeated
the test on the same battery?
Michael Scutter,
Education Training Consultant,
Email: michael_scut...@yahoo.com.au
Mobile: 0417822330 (Int +614178223300)
skype://michaelscutter
I don't say anything here
Repeat of old info?
The batteries in the new Schempps are sold on the accu-24.de website.
Bernard, Schleicher #27053 has the Tenergy LiFePO4 batteries in the usual
place. Still has the old school batteries in the tail, which needs the weight.
The Shorai is the wrong chemistry, unless you're
I have been trialling the shorai and can support Johns assessement . Shorai
rate their capacities on a cold cranking equivalent, its is entirely misleading
if you are looking for a battery to supply a steady current over a long period
of time. Their 14 ah will not supply 14ah for 1 hour or 1 ah
I don't have any graphs or deep knowledge to back my decisions up, but
personally I have moved back to SLA.
In my glider I have used NiMH with some success, but the lifetime of the
batteries (9Ah D cells with solder tabs) was only 2 years, and very expensive..
I think you have to be a lot more
Hi Luke, hello Scott
Thank you both for your input. It is valuable and very much appreciated -
just keep it coming!!!
This highly relevant information is useful for most (if not all) glider
pilots on this list.
Kind regards to all!
Bernard
_
From:
As I said yesterday, do proper engineering on your battery installation.
If you don't have real numbers for temperature limits, discharge
curves at various rates, charging characteristics etc etc you aren't
doing engineering, you're just guessing.
A battery designed to start a racing motorbike
Hi Mike. Really glad you mentioned the quoted rate, I forgot to mention that,
as it is how I got better batteries in my glider - point being of course that
it doesn't matter if SLA, NiMH or Li* - you have to check those discharge
rates, and temperature curves. We recently sent equipment to
Hello all
It just occurred to me that I have omitted to thank John Parncutt
for his research and his willingness to share the findings with us.
Of course, in this context Mike Borgelt's professional advice must
also be mentioned. Both contributions are extremely useful to many
of my gliding
Hello all!
Have a look and see how the beautiful fuselage design of the ASW 27,ASW 28
and ASG 29 can be misused!
http://www.jobyaviation.com/animation
Kind regards
Bernard
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Hi,
When people start talking of glider batteries I laugh at their logic. We
have a toy that cost anywhere between 2 - 10k and upwards to keep in the
air each year(not including getting to and from the airfield and
actually getting it in the air) and they are not willing to replace a
couple
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