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#121
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Best Overall Motorglider available today?
The EB29 with 25M span is listed at 63, same as the 21 M span JS2. Four more
meters doesn't buy you what it used to! jfitch wrote on 10/6/2020 8:39 AM: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I think it is best explained by a mistake in their math. I'd be interested in seeing the test data proving it. On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't understand why they advertise these dimensions in a different way). JS2 seems to be a nice project overall. Hard to me to understand where they streched out those +4 points of efficency in 21m, according to their calculated polars, compared to ASH31 (yes I know that '31 profiles are a bit superseeded and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be comparable - one internal cockpit rim and one external I guess. The 525mm shoulder width for the JS2 is exactly the same as the quoted figure for the JS1 (and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e and they are so similar that it would be hard to know which cockpit I was in with my eyes closed. Looking at the JS2 cockpit photographs it obvious that its structural cockpit rim design is the same as the 31, 26 and JS1. JS do not make small cockpits. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#122
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Best Overall Motorglider available today?
At 15:39 06 October 2020, jfitch wrote:
They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... |
#123
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Best Overall Motorglider available today?
Link? Google produces zero results.
On Tuesday, October 6, 2020 at 1 1:00:06 AM UTC-7, Paul T wrote: At 15:39 06 October 2020, jfitch wrote: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... |
#124
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Best Overall Motorglider available today?
The JS website says it's 60 for the JS1C/21M; 63 for the JS2/21M.
jfitch wrote on 10/6/2020 1:37 PM: Link? Google produces zero results. On Tuesday, October 6, 2020 at 1 1:00:06 AM UTC-7, Paul T wrote: At 15:39 06 October 2020, jfitch wrote: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#125
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[quote='Eric Greenwell[_4_];1030860']The EB29 with 25M span is listed at 63, same as the 21 M span JS2. Four more
meters doesn't buy you what it used to! Only a lower span loading :-) Colin |
#126
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Best Overall Motorglider available today?
At 20:58 06 October 2020, Eric Greenwell wrote:
The JS website says it's 60 for the JS1C/21M; 63 for the JS2/21M. jfitch wrote on 10/6/2020 1:37 PM: Link? Google produces zero results. On Tuesday, October 6, 2020 at 1 1:00:06 AM UTC-7, Paul T wrote: At 15:39 06 October 2020, jfitch wrote: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg.../download-the- guide-1 Yes they say 60:1 for the JS1, but Idafleig measured it at 63:1 - there is a Youtube video where Uys states this somewhere maybe this one https://youtu.be/yoek1na7L98 - if your that interested contact Jonkers yourself ..... or buy one and measure it yourself...... the JS5 will be 70:1 with 24m.. |
#127
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Best Overall Motorglider available today?
On Tuesday, October 6, 2020 at 9:48:47 AM UTC-7, Eric Greenwell wrote:
2G wrote on 10/6/2020 8:33 AM: On Monday, October 5, 2020 at 3:37:33 PM UTC-7, Dave Nadler wrote: On Sunday, October 4, 2020 at 8:04:18 PM UTC-4, 2G wrote: The telling difference for was when I did a 30nm glide at Ely in my 26e with an ASG29; I ended up 3,000ft below him! Apologies all, I guess Tom's '26 perhaps isn't the "Best Overall Motorglider Available Today"... Moral of the story: wing loading matters. Tom So, you were flying too fast for your wing loading, trying to keep up with the 29? -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 No, we were gliding at the same speed, but not flying wingtip to wingtip. Tom |
#128
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Best Overall Motorglider available today?
On Tuesday, October 6, 2020 at 1:58:06 PM UTC-7, Eric Greenwell wrote:
The JS website says it's 60 for the JS1C/21M; 63 for the JS2/21M. jfitch wrote on 10/6/2020 1:37 PM: Link? Google produces zero results. On Tuesday, October 6, 2020 at 1 1:00:06 AM UTC-7, Paul T wrote: At 15:39 06 October 2020, jfitch wrote: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 Someone might ask them how they came up with these L/D figures because I understand that they aren't from actual flight tests. Tom |
#129
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Best Overall Motorglider available today?
At 04:12 08 October 2020, 2G wrote:
On Tuesday, October 6, 2020 at 1:58:06 PM UTC-7, Eric Greenwell wrote: The JS website says it's 60 for the JS1C/21M; 63 for the JS2/21M. jfitch wrote on 10/6/2020 1:37 PM: Link? Google produces zero results. On Tuesday, October 6, 2020 at 1 1:00:06 AM UTC-7, Paul T wrote: At 15:39 06 October 2020, jfitch wrote: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg.../download-the- guide-1 Someone might ask them how they came up with these L/D figures because I understand that they aren't from actual flight tests. Tom THE JS1C TO MY KNOWLEDGE HAS BEEN MEASURED AT 63:1 BY THE IDAFLEIG IN ITS FLIGHT TESTS- PROBABLY THE MOST RELIABLE WAY OF MEASURING A GLIDERS POLAR. (I THINK THE JONKERS BOYS WHERE SUPRISED BY THAT FIGURE AS IT IS RARE FOR A GLIDER TO EXCEED ITS THEOROTICAL FIGURE -BUT IT DOES HAPPEN.) ALL MANUFACTURERS FIGURES ARE AT BEST 'THEORETICAL' UNTIL MEASURED.................. SOME ARE WILDLY OPTIMISTIC - BUT BEST L/D DOESNT MEAN MUCH THESE DAYS REALLY................. ITS NOT AS THOUFGH THIS AIRCRAFT AS NOT PROVED ITSELF IN THE CONTEST ARENA IS IT....... |
#130
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Best Overall Motorglider available today?
Idaflieg measurements are never published to the public.
Le mardi 6 octobre 2020 Ã* 22:37:22 UTC+2, jfitch a écritÂ*: Link? Google produces zero results. On Tuesday, October 6, 2020 at 1 1:00:06 AM UTC-7, Paul T wrote: At 15:39 06 October 2020, jfitch wrote: They are claiming 63:1, that is 7 points higher than AS claim of 56:1. I th= ink it is best explained by a mistake in their math. I'd be interested in s= eeing the test data proving it.=20 On Tuesday, October 6, 2020 at 12:53:25 AM UTC-7, Carlo Orsini wrote: Thank you for your first hand infos, those are good news for me (I don't = understand why they advertise these dimensions in a different way). JS2 see= ms to be a nice project overall. Hard to me to understand where they strech= ed out those +4 points of efficency in 21m, according to their calculated p= olars, compared to ASH31 (yes I know that '31 profiles are a bit superseede= d and the aspect ratio is a factor too but 4 points are a huge amount!!). Those two dimensions for the JS2 and the ASH31 are clearly not be compa= rable - one internal cockpit rim and one external I guess. The 525mm should= er width for the JS2 is exactly the same as the quoted figure for the JS1 (= and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from = which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e = and they are so similar that it would be hard to know which cockpit I was i= n with my eyes closed. Looking at the JS2 cockpit photographs it obvious th= at its structural cockpit rim design is the same as the 31, 26 and JS1.. JS = do not make small cockpits. I believe the Idafleig measured a JS1C at 63:1......so the JS2 witH its few improvements on the JS1C should achieve that.... |
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