Looking at the ASH and ASH25Mi data on the
Schleicher website the rotary engine installation
is 110Kg. For the ASG32/ASG32Mi this seems to be
80 Kg. It may be that the wing structure for the
25 needs extra strength hence weight for the
motor and the ASG32 already is designed for it.
To keep a 750 Kg 50:1 glider airborne requires
4.5kilowatts of power. At this low power with a
reasonably large prop, prop efficiency might get
up to 60% or even a little better. So 7.5 KW from
the battery. For about 1 hour to get 100Km range under power.
So somewhere in the range 80 to 100Kg of added
weight sounds about right. Be interesting to know
what power the electric motor in the ASG32EL is.
You can do this with a glider designed for the
extra load in the fuselage. You need to be
careful with max NLP when proposing an existing sailplane be motorised.
Mike
04:33 AM 25/06/2014, you wrote:
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Hi Peter
I have just returned from a visit to the
Schleicher factory where I checked on the progress of the ASG 32 EL.
The designers have managed to bring the weight
of the electric propulsion system (including batteries) down
to the weight of the self launching rotary
engine including accessories and fuel. It means that there is no problem
with the "maximum weight of non lifting parts"
although all batteries are located in the engine bay. Consequently
there is no need to modify any structural
components and the ASG 32 Mi and EL versions are almost identical.
Quite remarkable, they still get a range of 100
km under power. However, please keep in mind that the ASG 32 EL
is not a self launching glider - Â only a sustainer (or turbo)!
Regardless, it shows the advances in this field
quite clearly. There are interesting times ahead!!!!
Kind regards
Bernard
From: [email protected]
[mailto:[email protected]]
On Behalf Of Peter Champness
Sent: Sunday, June 22, 2014 1:09 PM
To: Discussion of issues relating to Soaring in Australia.
Subject: Re: [Aus-soaring] Zero Motorcycles
Australia The Electric Motorcycle Company - Official Site
Thanks Mike,
That accords with my experimental results so far.
I am talking retrofit here.
Launch is still just out of reach because of
weight considerations. It has been done with very light weight gliders.
Sustainer is practical, but range is
limited. 20 minutes sustainer power seems
achievable with either LiFePO4 or LIPolymer for
about 10-12kg battery weight (perhaps a bit
less) . Motor is lighter than petrol so it is an option currently.
That could be get home from quite a lot of
situations, especially if you have applied some judgement during the flight.
On Sun, Jun 22, 2014 at 11:23 AM, Mike Borgelt
<<mailto:[email protected]>[email protected]>
wrote:
Unfortunately there is a "maximum weight of non lifting parts".
You may need to put the batteries in the wings.
See The Binder EB29DE at
<http://www.binder-flugmotorenbau.de/eb2900.html?&L=1>http://www.binder-flugmotorenbau.de/eb2900.html?&L=1
Not a show stopper but extra complication.
To raise a 500Kg glider through 2000
meters(launch plus retrieve) requires 10
megajoules of energy plus what energy was
required to keep it in level flight for the time
taken to get there. Say 1/3 of that. More
powerful motors are better but prop efficiency
suffers as you put more through the same
diameter prop. Interesting tradeoff and design iteration.
1 kilowatt hour = 3.6 megajoules.
Prop efficiency and motor efficiency losses will
be at least 50% so you need around 7.5 kilowatt
hours of energy in the battery. You won't want
to discharge it deeply if you can help it so a
little extra helps. Say 8 kilowatt hours.
Currently the LiFePO4 batteries (currently
safest Li technology) can get around 100 watt
hours per kilogram so 80 Kg of batteries. Maybe
100 Kg installed with portable charger, motor, prop and controller.
It will end up similar to flying a motorless glider with water ballast.
Not impossible. That retrieve should get you to
an airfield of some sort at least but probably
not home if you like the longer cross country flights.
Li - ion batteries may do a little better but
need more protection circuitry/physical barriers
etc all of which add to weight.
Mike
At 08:09 AM 22/06/2014, you wrote:
<http://www.zeromotorcycles.com/au/>http://www.zeromotorcycles.com/au/
54 horsepower for 20 Grand, FES and electric
refits for old sustainers and self launchers are
getting closer by the day. By the look of it you
can add power packs easily. There is a video in
there some where about supermoto racing, for
those of you not into motorcycles the standard
engine is very similar to a self launcher albeit in 4 stroke mode.
I know it's simplistic but
Keep mast, prop and prop flange.
Remove engine and fuel tanks.
Epoxy in battery holders and bobs your uncle.
Justin
Justin Sinclair
17 Queen st.
Scarborough Qld 4020
Hm 07 3885 8949
Mob 0421 061 811
Email <mailto:[email protected]>[email protected]
Sent from my iPad
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quality soaring instrumentation since 1978
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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