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  #11  
Old December 12th 16, 08:01 PM posted to rec.aviation.soaring
J. Nieuwenhuize
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Default JS3 chatter

Ah, should have put the news in a fresh thread.

Anyhow, congrats to Jonkers.

I'm surprised that they haven't gone for a center-wing with two light short tips. The high wing is a natural for using a one-piece center wing. By eliminating the most complex structural and control joint, there could be a significant reduction in build time, cost and weight. Putting it together should also be easier.

I hope their considerations to go conventional (as opposed to for example the Mü31) will one day be discussed.

For those interested in the aero background, a thread I started a few years ago discussed the aero of higher positioned wings in a bit more detail: http://www.homebuiltairplanes.com/fo...ad.php?t=15371
  #12  
Old December 12th 16, 09:31 PM posted to rec.aviation.soaring
Roy Pentecost[_2_]
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Default JS3 chatter

At 14:49 12 December 2016, krasw wrote:
maanantai 12. joulukuuta 2016 15.26.23 UTC+2

kirjoitti:
On Monday, December 12, 2016 at 6:15:26 AM UTC-5, krasw wrote:
Looks nice, congrats for the new bird! According to fb rumours it is

not going to make Australia WGC, if that is true, too bad.

Because?


I guess glider being in the different continent three weeks before WGC
might have something to do with it?

Look at the WGC 2017 Benalla entry list, Joncker brothers x2 entered in 15m

class!
Of course they will be there!

  #13  
Old December 13th 16, 12:44 AM posted to rec.aviation.soaring
Jonathan St. Cloud
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Default JS3 chatter

Sure have three weeks to test fly and ship bird to Benalla, clear customs. What are they going to do with the extra time?


On Monday, December 12, 2016 at 12:45:05 PM UTC-8, Roy Pentecost wrote:
At 14:49 12 December 2016, krasw wrote:
maanantai 12. joulukuuta 2016 15.26.23 UTC+2

kirjoitti:
On Monday, December 12, 2016 at 6:15:26 AM UTC-5, krasw wrote:
Looks nice, congrats for the new bird! According to fb rumours it is

not going to make Australia WGC, if that is true, too bad.

Because?


I guess glider being in the different continent three weeks before WGC
might have something to do with it?

Look at the WGC 2017 Benalla entry list, Joncker brothers x2 entered in 15m

class!
Of course they will be there!


  #14  
Old December 13th 16, 04:05 AM posted to rec.aviation.soaring
Dan Daly[_2_]
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Default JS3 chatter

On Monday, December 12, 2016 at 6:44:34 PM UTC-5, Jonathan St. Cloud wrote:
Sure have three weeks to test fly and ship bird to Benalla, clear customs. What are they going to do with the extra time?

Certificate of Airworthiness comes to mind...
  #15  
Old December 13th 16, 06:05 AM posted to rec.aviation.soaring
Sean[_2_]
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Default JS3 chatter

The glider is rumored to be on a Quantus 747 headed this way...

I really dont care much about how it looks (beautiful in my opinion). I care how it performs (all aspects) in "the big show."

It is obvious to me that (far) more development time/effort/energy went into this glider than the Ventus 2's new wing ;-). But that said, what's the payoff going to be? Sometimes great computer designs are miserable in reality. We shall see the results start to come in fairly soon. It's a bummer that they will not both be in flying in both 15 & 18m.

I have a feeling this JS3 is going to be the real deal.

Sean
  #16  
Old December 13th 16, 05:00 PM posted to rec.aviation.soaring
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Default JS3 chatter

New panel and cockpit pictures posted on Facebook.

Hooray! The mechanical altimeter and compass are missing on the new panel. Hopefully the JS3 minimum equipment list will allow GPS to replace these steam gauges.

The instrument below the LXNAV 9070 flight computer is in a LXNAV case. Guessing this is a water ballast or battery management system.

The two switches mounted above the jet management system are marked master something. Guessing this is power on/off.

Perhaps the switches on to left side of the seat pan are bug wipers.

New canopy releases (very sexy) hopefully will reduce glare.

Very tidy panel. A++
  #17  
Old December 13th 16, 05:48 PM posted to rec.aviation.soaring
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Default JS3 chatter

On Tuesday, December 13, 2016 at 8:00:40 AM UTC-8, wrote:
New panel and cockpit pictures posted on Facebook.



Some things I notice:

Eyeball vent on the side of the cockpit is gone. We are back to the little flip out vent in the sliding window?

The cockpit extraction vent on the fuselage behind the pilot’s head is gone. In one of the photos there is something on the bottom of the fuselage just in front of the gear doors – has the vent been relocated there?

Due to the nose up attitude, on the takeoff roll it will be hard to see the towplane, and after landing it will be hard to see the runway. True, those are only a few seconds on each flight, but those are important seconds.

Maybe it is an optical illusion, but the canopy appears “squished” – from the side, the curve of the canopy appears flatter than the contour of the fuselage. Less headroom.

Wing shape appears almost identical to the one on the 18 meter version. It fact, without knowing better, I would think that this is just the 18m wing on a new fuselage.

Tail appears substantially higher than on the JS1B -- more like the tail on the JS1A. This might improve handling, but wouldn't it increase drag?





  #18  
Old December 13th 16, 09:51 PM posted to rec.aviation.soaring
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Posts: 114
Default JS3 chatter

Interesting design. With higher wing you'll have a better chance of clearing low obstacles, benefits landout situations, narrow runways. Nice on an 18m.
  #19  
Old December 13th 16, 11:22 PM posted to rec.aviation.soaring
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Posts: 190
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Would be interested to know details of four tubing connector fittings required to "plumb" the probes in the tail each assembly and disassembly sequence. Surely its not a "press tubing onto a barbed in-line connector" process. Thinking it would be a two person job...one to balance the horizontal and the other to connect the fittings.
Better yet...you assemble once at beginning of contest, tie out every night, and disassemble once at end of contest. Awh... the convenience of good weather, a sustainer, poly paint, and good covers.

  #20  
Old December 15th 16, 03:53 PM posted to rec.aviation.soaring
Tim Taylor
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Jonkers posted an update this morning with technical details.


Wing area under 94 ft^2 and wing loading over 12 lb/ft^2 possible. Minimum wing loading will be well over 8 pounds for most pilots.


http://www.jonkersailplanes.co.za/js3revealed.htm
 




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