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Nov 11, 2014, 05:40 PM
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1/3rd scale GPS racer?


I'm just trying to gauge peoples opinions on which 1/3rd scale (non up-and-go class) to look into getting.

Two I'm ruling out are the Arcus (I don't like duo's) and the AN66...I prefer T-tails, aesthetics come into play as much as performance for me!

My current favourites are the the KC HpH304 Shark or the Windwings JS1.
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Nov 13, 2014, 08:29 PM
More gadgets please.
pete914's Avatar
I would look into the ChocoFly's Diana 2 if you are looking for a single seater. Seems the Antares available through USA Soaring is a known winner.
Both beautiful ships. The Diana 2 is slight bigger than 1/3, not sure if there are classes that allow 1/2 scale in GPS racing
Nov 14, 2014, 12:00 AM
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The GPS class is 1/3, the Diana 2 is 40%, so as of today the competitive choices are the Antares, the Arcus, the AN-66 and the Shark, and of course any other 1/3 model which will do the task, just slower, there is a 1/3 Quintus in the works, but that is a year away, the Shark is by far the most economical. The AN-66 is a great choice because it breaks down into a fairly small box, but it's cost is double the Shark, the others are somewhere in between.
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Nov 14, 2014, 04:38 AM
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This is my current 'top of the list'...on paper it should perform well but I haven't read/heard about it in competition:

http://www.windwings.de/eng/js1.html

Slightly more than the Shark but considering it's one whole metre wider I don't think that's too bad.
Nov 14, 2014, 07:05 AM
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Quote:
Originally Posted by mark_snipz
This is my current 'top of the list'...on paper it should perform well but I haven't read/heard about it in competition:

http://www.windwings.de/eng/js1.html

Slightly more than the Shark but considering it's one whole metre wider I don't think that's too bad.
All Windwing (Jörg Etzler) models are made in the Paritech factory. Reports I have seen of the quality and fit on the Mistrals and the JS1 are very enthusiastic. Jörg is also fantastic to deal with by email, he responds quickly and fully (unlike some others )...
Nov 14, 2014, 04:03 PM
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Is anyone importing the JS-1 to the USA? It looks to be a very good contender, depending on what country you are in it can be VERY expensive bringing in a single model, I forgot about the LET ASH-31, it should do pretty good.
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Mar 01, 2015, 12:47 AM
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GPS racer


Have a look here for a new development: https://www.facebook.com/groups/GPSs...?ref=bookmarks
Mar 01, 2015, 02:17 AM
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Originally Posted by namibchris
Have a look here for a new development: https://www.facebook.com/groups/GPSs...?ref=bookmarks
Well Chris... some old farts like me do not have a FB account... Do you have an other solution to have access to this new development?

Just a personal comment regarding some posts above: a 1/3 scale glider will have to perform at a very different Re than its big brother and the modern gliders have a very high aspect ratio. Even if your 1/3 scale flies at high speed it is still to slow (compared to the true scale speed) to benefit from the aerodynamic choices of the full scale glider.

I believe that looking at the first gliders from the "plastic" era might be a better solution performance wise for the GPS racing class.
Mar 01, 2015, 06:01 AM
dare to thermal
some new developments:
http://www.klapptriebwerk.de/produkt...ge/arcus-race/
http://www.rc-network.de/forum/showt...gle-Wettbewerb!

concerning some of the older open class gliders:
ASW12, ASW17
D36 Circe
Jantar 2
BS1
ELFE S4a http://lesgpr.free.fr/construire/elfe-s4/elfe-s4.htm

/Bernd
Mar 02, 2015, 11:57 AM
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Sarg


Herewith part 1 of the SARG development, part 2 to follow soon
Mar 02, 2015, 12:06 PM
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Sarg
Mar 03, 2015, 01:01 AM
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Bernd, I have looked for the Elfe 18 at 1/3scale for sometime now. As soon as I have some time I am planning to check what its potential is. The wing planform is rather "interesting" and the choice of wing sections and their distribution might be a chalenge for the model size (even at 6 metres span). Il truly like the fuselage shape for the (lower) Reynolds numbers, the proportion of the tail with the long moment arm and the oversize rudder.

Chris, thank you very much for the informations. Looking forward for the SARG part 2: I am sure you will end-up with an other outstanding performer. The fuse had such workout that it needed to be wrapped with a sweat towel? Cheers.
Mar 03, 2015, 01:16 PM
dare to thermal
:-) do you have also checked ASW12/D36 which is similar to the AN66 (except the V-Tail).
Mar 03, 2015, 09:44 PM
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Quote:
Originally Posted by Bernd Brunner
:-) do you have also checked ASW12/D36 which is similar to the AN66 (except the V-Tail).
Yes, this is definitely an other very good contender. With the crow function the lack of air brake is not a problem (for a true scale machine).

Just two comments:

It has a higher aspect ratio (than the Elfe) and you will need to check the effect on the performances at 1/3rd scale. But the wing planform might be easier to deal with for a good lift distribution.

The rudder efficiency is not going to be as good as on the Elfe. Something that is too often overlooked on scale gliders.
Mar 04, 2015, 10:44 PM
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SARG part2


Herewith part two of the SARG (South African Racing Glider) design, part 3 to follow soon


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