[Aus-soaring] Record Ratified

[pam]

 

GFA has ratified the following Australian Record flown by Harry and Wendy
Medlicott in their Arcus M on 18/1/16 from Corowa:

20m 2-seater class

Free Distance via up to 3 TPs

Distance awarded: 948.5 Km.

>> 

Pam Kurstjens

Records Officer

Gliding Federation of Australia

 

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Re: [Aus-soaring] phone number

[Mike Borgelt]

Anyone have a phone number for Bruce Tuncks? Off line please.

Mike





Borgelt Instruments - design & manufacture of 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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Re: [Aus-soaring] Autonomous soaring

[Mike Borgelt]

At 08:45 PM 2/10/2016, you wrote:

First 100km task flown autonomously (and all below 4000ft)

A commercial off-the-shelf RnR Products SBXC sailplane was outfitted 
as a UAV and performed more than 100 test flights of the ALOFT 
algorithm, with a nominal endurance of 3 min after a winchlaunch to 
approximately 100 m altitude. A notable success was unofficially 
breaking the cross-country soaring goal-and-return world record by 
flying 97.2 km (60.4 mi) declared distance over approximately 4.55 
hr. Best endurance demonstrated by the algorithm was 5.3 hr and best 
range demonstrated by the algorithm was 113.4 km (70.47 mi) open 
distance. There was no motor on the ALOFT sailplane for any of these 
flights, so all the endurance and range performance clearly came 
from flying in thermals


http://www.dtic.mil/get-tr-doc/pdf?AD=ADA614555


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I plotted the polar for the model glider using the polar coefficients given.
Min sink is about 0.5 knots at 10 KIAS, best L/D is about 20 at 13 
knots or so and 4 knots of sink at 25 KIAS.


Makes the speed look a fair bit better.

They ought to put the autopilot in a two seat sailplane and have the 
human pilot follow the autopilot commands. Preferably with another 
glider of the same type flying the same course.


Things to note: They use netto in the cruise to find the best air. 
They seem to do a g compensated netto for climb too. This isn't quite 
what you want as when climbing you want to climb fastest. This isn't 
necessarily the same as being in the best air as the sink speed of 
the glider  through the air varies with G load(bank angle) although 
the way their algorithm works it is effective. A human pilot will 
only use the bank angle required to maximise climb rate. You all do 
that don't you?


Mike

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Re: [Aus-soaring] Aero Glass BVLOS

[DMcD]

>>Small aircraft really haven't made much progress over the 1946 Beech Bonanza, 
>>70 years ago.

David Thurston wrote in Design for Flying, "… it may be safely noted
that private aircraft performance has not experienced any great leap
forward over the past 40 years. Our speeds are where they were in the
30s. During that period of grass airfields, a four seat, streamlined
fixed gear Percival Vega Gull cruised at…"

Presumably with a Gypsy major engine. If you have not already done so,
have a look at Neville Shute (Norway)'s book Slide Rule where he talks
about starting Airspeed Aircraft for a few thousand pounds and running
it for the first decade or so until they were employing hundreds of
workers and still not making a profit.

It's hard to make progress when half the industry is still working in
inches, poundals and slugs.

D
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