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Another E glider concept



 
 
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  #21  
Old August 19th 20, 04:57 PM posted to rec.aviation.soaring
Soartech
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Posts: 268
Default Another E glider concept

If you are looking for controllable drag you simply need a center pull cord at the apex of the drag chute.
Cord pulled = little drag
Cord slack = full drag
  #22  
Old August 19th 20, 05:38 PM posted to rec.aviation.soaring
Dan Marotta
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Posts: 4,601
Default Another E glider concept

Seems simple enough to design in solenoid activated pins to prevent the
blades from folding during reverse.Â* ...But the reverse thrust just
might put the blade tips into the ground...

On 8/19/2020 9:31 AM, Eric Greenwell wrote:
Chris Wedgwood wrote on 8/19/2020 7:33 AM:
On Tuesday, August 18, 2020 at 3:01:45 AM UTC+2, Dave Nadler wrote:
On Monday, August 17, 2020 at 8:01:08 PM UTC-4, Cumungus wrote:
When the propeller spins backwards in the demo reel, confidence
that the
engineers will make an airworthy aircraft is instantly flushed down
the toilet.

That feature is for backing into your parking space.


Or for landing downwind on golf courses..

That's an interesting idea, sort of the modern tail parachute like I
had on my H301. It was enormously powerful, but not controllable, just
deployed or not. An electrically powered propeller could be used to
provide adjustable drag from zero to "a lot". The design issue is
keeping the propeller from folding backwards when you want it to
produce drag.


--
Dan, 5J
  #23  
Old August 19th 20, 05:39 PM posted to rec.aviation.soaring
Pierre Vav
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Posts: 18
Default Another E glider concept

Le dimanche 16 août 2020 19:33:33 UTC+2, Jonathan St. Cloud a écritÂ*:
https://www.youtube.com/watch?v=ZIYU2zkGQFQ


monerai is back ?
  #24  
Old August 19th 20, 05:48 PM posted to rec.aviation.soaring
Jonathon May
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Posts: 82
Default ras

Is this site working?


  #25  
Old August 19th 20, 06:02 PM posted to rec.aviation.soaring
Dan Marotta
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Posts: 4,601
Default ras

No!Â* I did not see your message... :-D

On 8/19/2020 10:48 AM, Jonathon May wrote:
Is this site working?



--
Dan, 5J
  #26  
Old August 20th 20, 04:51 AM posted to rec.aviation.soaring
AS
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Posts: 653
Default Another E glider concept

On Wednesday, August 19, 2020 at 11:58:03 AM UTC-4, Soartech wrote:
If you are looking for controllable drag you simply need a center pull cord at the apex of the drag chute.
Cord pulled = little drag
Cord slack = full drag


There were several Eastern European or Russian gliders with retractable drogue chutes. There was a line attached to the apex which could be hauled in or let out to retract the chute into the tail boom. I have no idea how that was done (hand cranked winch?) and how reliable that system was. It didn't stand the test of time, I guess, otherwise we would all have them.

Uli
'AS'
  #27  
Old August 28th 20, 01:35 AM posted to rec.aviation.soaring
ProfJ
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Posts: 48
Default Another E glider concept

On Wednesday, 19 August 2020 at 10:39:50 UTC-6, Dan Marotta wrote:
Seems simple enough to design in solenoid activated pins to prevent the
blades from folding during reverse. ...But the reverse thrust just
might put the blade tips into the ground...
On 8/19/2020 9:31 AM, Eric Greenwell wrote:
Chris Wedgwood wrote on 8/19/2020 7:33 AM:
On Tuesday, August 18, 2020 at 3:01:45 AM UTC+2, Dave Nadler wrote:
On Monday, August 17, 2020 at 8:01:08 PM UTC-4, Cumungus wrote:
When the propeller spins backwards in the demo reel, confidence
that the
engineers will make an airworthy aircraft is instantly flushed down
the toilet.

That feature is for backing into your parking space.

Or for landing downwind on golf courses..

That's an interesting idea, sort of the modern tail parachute like I
had on my H301. It was enormously powerful, but not controllable, just
deployed or not. An electrically powered propeller could be used to
provide adjustable drag from zero to "a lot". The design issue is
keeping the propeller from folding backwards when you want it to
produce drag.


--
Dan, 5J

You don't have to fix the propeller blades in place regardless of pitch, centripetal force does it for you. Otherwise helicopters and Carat motorgliders would not fly (for long)
  #28  
Old August 29th 20, 01:24 AM posted to rec.aviation.soaring
Steve Koerner
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Posts: 430
Default Another E glider concept

Here is a varient of this motorglider with higher wing loading for very strong soaring conditions:

http://www.cnn.com/travel/article/ce...ane/index.html
  #29  
Old August 29th 20, 03:13 AM posted to rec.aviation.soaring
kinsell
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Posts: 546
Default Another E glider concept

On 8/28/20 6:24 PM, Steve Koerner wrote:
Here is a varient of this motorglider with higher wing loading for very strong soaring conditions:

http://www.cnn.com/travel/article/ce...ane/index.html


Speed of a jet with eight times better fuel economy and six times better
operating costs. I can tell you watch too much CNN.

  #30  
Old August 29th 20, 03:37 PM posted to rec.aviation.soaring
BobW
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Posts: 504
Default Another E glider concept

On 8/28/2020 8:13 PM, kinsell wrote:
On 8/28/20 6:24 PM, Steve Koerner wrote:
Here is a varient of this motorglider with higher wing loading for very
strong soaring conditions:

http://www.cnn.com/travel/article/ce...ane/index.html


Speed of a jet with eight times better fuel economy and six times better
operating costs.Â* IÂ* can tell you watch too much CNN.


Hyuk hyuk...the CNN irony is difficult to overlook, alright! That said, good
on Mr. Otto for having the courage of his convictions, and, for not - so far
as I'm aware - going entirely down the vaporware rabbit hole. He at least has
a state-of-various-arts-pushing flying airplane....a complex one, too!

In laminar technology advancement terms, I'm reminded of the P-51
("non-laminar" laminar airfoil profile - insufficiently developed
materials/manufacturing issues) and the Piaggio P.180 Avanti (metal [mostly],
twin pusher props, produced and sold, lotsa info available online). Both
arguably-kinda-sorta *did* advance the state of the aerodynamic art and were
successes in vastly differing ways.

The latter arguably achieved many/most of its aerodynamic design goals, while
remaining unknown to the bulk of the turboprop light twin world so far as I
can tell. Unlike Mr. Otto's approach, it utilizes well-proven, "jet-thirsty"
PT-6 engines. And yes, it has a distinctive - unmistakable - overhead
engine/prop aural signature. Fuel economy? Armchair warriors arise!

With luck, maybe we'll get to see how Mr. Otto's project fares in its targeted
flying niche.

Bob W.

---
This email has been checked for viruses by AVG.
https://www.avg.com

 




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