Kremlinology:
My guess is the following cells by Kokam: www.kokam.com
SLPB100216216H Nominal 40 A-h 0.99 Kg each. 31Kg
for 28 cells plus pack/protection circuitry sound about right.
Petrol isn't flammable until mixed with air +
ignition source. Can happen. We've seen the
pictures of the Nimbus 4DM in Namibia and I've
seen pictures of a fried ASH26 engine
installation. LiPos are. Read some of the stuff
on electronics stack exchange. Allegedly they burn in vacuum. Great.
Not that happy about the cylindrical Li-ion cells
either. These are very protected but laptops still catch fire.
LiFePO4 is MUCH safer chemistry but lower
specific energy. All need protection circuits so
we're down to how reliable the electronics is
particularly when soldered with environmentally
friendly, lead free Eurocrap solder.
I've been tracking these guys for a while now:
http://www.solidenergysystems.com/ seems to be a
much safer* technology and higher energy density.
* Carol says read : None have caught fire yet
Mike
At 09:10 AM 9/29/2017, you wrote:
Content-Type: multipart/related;
boundary="----=_NextPart_000_001C_01D338FE.90514450"
Content-Language: en-us
They were LiPoâs Bernard.
EASA had surprisingly certified their their use
when theyâre known to be unsafe.
All FES types are currently grounded in Europe..
It seems LiFePoâs are a much safer option.
Regards
Noel.
From: Aus-soaring
[mailto:[email protected]]
On Behalf Of Future Aviation Pty. Ltd.
Sent: Friday, September 29, 2017 6:33 AM
To: Discussion of issues relating to Soaring in Australia.
Subject: [Aus-soaring] FES fire in the UK
Good morning all
This was sent to me over night by a German friend of mine.
As you can see, no mention was made of the type of battery used here.
From my visits to the AERO trade fair I know
that some manufacturers use LiPo Batteries.
They have the best power to weight ratio but
they are known to be extremely dangerous.
I will attempt to find out if this type of
battery was installed in this glider.
Kind regards to all
Bernard
From UK, newspaper report:
[]
The Air Accidents Investigation Branch has made
a safety recommendation after a sailplane burst
into flames shortly after landing in Parham
Airfield. On August 10, 2017, the glider
sailplane set off from the airfield between
Storrington and Pulborough at 10.21am for a
flight lasting approximately two hours. The
glider was flown normally to a smooth touchdown,
according to the AAIB, until the pilot heard an
âunexpected noiseâ. The AAIB report said:
âAs the glider slowed during the ground run,
the pilot smelled burning and the cockpit filled
with smoke that was moving forwards from behind
the pilotâs head. âHe vacated the cockpit
normally, without injury, and observed that the
Front Electric Sustainer (FES) battery
compartment cover was missing and that smoke,
followed shortly by flames, was coming from the
battery compartment. âThe airfield fire truck
arrived promptly and an initial attempt was made
to extinguish the fire using a CO2 gaseous
extinguisher, but this proved unsuccessful.
âAqueous film-forming foam (AFFF) was then
sprayed into the FES battery compartment and the fire was extinguished.â
The pilot was the only person on board the glider, according to the AAIB.
He did not report observing any warning messages
or illuminated LEDs, when asked by the AAIB,
although his attention was drawn outside the cockpit during landing.
The AAIB report found existing FES battery
installations âdo not provide sufficient warningâ to a pilot of a fire.
As a result, the AAIB made a safety
recommendation that âall powered sailplanes
fitted with an FES system, must be equipped with
a warning system to alert the pilot to the
presence of a fire in the FES battery compartmentâ.
The AAIB investigation confirmed the âorigin
of the fireâ was the forward FES battery.
The report added: âIts battery box was
ruptured along the rear left corner and the
battery assembly was heavily fire damaged.
âThe rear FES battery box suffered from
external fire damage although the internal
components were only slightly damaged and the cells remained charged.
âThe FES battery compartment was heavily fire damaged.
see also
<https://www.gov.uk/aaib-reports/aaib-special-bulletin-s3-2017-on-hph-glasflugel-304-es-g-gsgs>https://www.gov.uk/aaib-reports/aaib-special-bulletin-s3-2017-on-hph-glasflugel-304-es-g-gsgs
http://www.front-electric-sustainer.com/news.php
<http://publicapps.caa.co.uk/docs/33/20170906EASAAD20170167E.pdf>http://publicapps.caa.co.uk/docs/33/20170906EASAAD20170167E.pdf
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www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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