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#21
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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
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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
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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
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ras
Is this site working?
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#25
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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
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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
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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
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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
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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
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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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