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#1
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New Glider Dream Elon Musk Flow
How about one that flys backwards?
A canard gives lift instead of the horizontal stab pushing the tail down. Also gives a nice high place to put the FES. Also might put more crush space in front of the pilot. |
#2
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New Glider Dream Elon Musk Flow
On Sun, 11 Feb 2018 10:52:02 -0800, stu857xx wrote:
How about one that flys backwards? A canard gives lift instead of the horizontal stab pushing the tail down. It's been tried a few times in the competition Free Flight model building world. Its easy to to make them fly quite well. I lost one, a 27" McCanard with a TeeDee .010 on it, upward in a thermal. I remember it was quite easy to trim, but had no d/t provision on the plan so I hadn't fitted one: hence it climbing several hundred feet on the glide and disapearing over a hill. Doug Joyce got into the US F1C team with a set of canard models but, whoile the climb was good, they didn't glide as well as conventional layout models. The problem is that the main lifting surface has to operate at a lower AOA than the foreplane because the latter MUST stall first for the aircraft to be stable. This means that in almost all cases the mainplane will be operating at a less than optimal AOA. -- |
#3
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New Glider Dream Elon Musk Flow
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#4
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New Glider Dream Elon Musk Flow
On Sunday, February 11, 2018 at 12:52:05 PM UTC-6, wrote:
How about one that flys backwards? A canard gives lift instead of the horizontal stab pushing the tail down. Also gives a nice high place to put the FES. Also might put more crush space in front of the pilot. Burt Rutan tried it, and won an SSA contest with his design - mostly because he was Burt Rutan, not because the glider (Solitaire) was any good - because it basically sucked as a glider and was hideous to look at to boot. Think about the aerodynamics of gliders a bit (in thermalling flight) and it's easy to see why. And by the way, in cruise, my LS-6's tail isn't pushing the tail down, either - and with the CG adjusted correctly isn't pushing down much while thermalling either. Look up "decalage" if this doesn't make any sense. Many of the ideas in this interesting thread have been tried: Telescoping wings, variable geometry, flexible skins (there are two Speed Astirs at our field with that feature!). I'd like to see new, automated building procedures and materials that would result in stronger, lighter, more accurately profiled (and re-profiled, when needed) gliders. Active BLC could add a few percent performance, but why? Keep it simple, cost down, light enough for a small FES to get you home, and revamp the cockpit to better display all the data that is available (air data, weather, other aircraft, etc.). My idea panel would have one big display with everything on it for navigation, tactics and weather, and all performance data (airspeed, altitude, attitude, climb, AOA, STF, etc) projected on the visor of a lightweight, positionally tracked helmet. Directional audio so you can hear where the center of the thermal is. Icons showing where all the traffic (FLARM, ADS-B, PCAS) is in the vicinity, as well as navigation and thermal markers (where someone else just climbed). Ballistic chutes of course, so comfort is increased. Kirk 66 |
#5
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New Glider Dream Elon Musk Flow
Well, screw the helmet idea!Â* Who needs the weight?Â* If you're gonna go
that far, why not a set of light weight glasses with a bluetooth receiver built in and all of your flight and collision avoidance information focused at infinity through the glasses kinda like a HUD.Â* Cockpit sensors would track the glasses and adjust the picture to the viewing angle. On 2/11/2018 1:01 PM, kirk.stant wrote: On Sunday, February 11, 2018 at 12:52:05 PM UTC-6, wrote: How about one that flys backwards? A canard gives lift instead of the horizontal stab pushing the tail down. Also gives a nice high place to put the FES. Also might put more crush space in front of the pilot. Burt Rutan tried it, and won an SSA contest with his design - mostly because he was Burt Rutan, not because the glider (Solitaire) was any good - because it basically sucked as a glider and was hideous to look at to boot. Think about the aerodynamics of gliders a bit (in thermalling flight) and it's easy to see why. And by the way, in cruise, my LS-6's tail isn't pushing the tail down, either - and with the CG adjusted correctly isn't pushing down much while thermalling either. Look up "decalage" if this doesn't make any sense. Many of the ideas in this interesting thread have been tried: Telescoping wings, variable geometry, flexible skins (there are two Speed Astirs at our field with that feature!). I'd like to see new, automated building procedures and materials that would result in stronger, lighter, more accurately profiled (and re-profiled, when needed) gliders. Active BLC could add a few percent performance, but why? Keep it simple, cost down, light enough for a small FES to get you home, and revamp the cockpit to better display all the data that is available (air data, weather, other aircraft, etc.). My idea panel would have one big display with everything on it for navigation, tactics and weather, and all performance data (airspeed, altitude, attitude, climb, AOA, STF, etc) projected on the visor of a lightweight, positionally tracked helmet. Directional audio so you can hear where the center of the thermal is. Icons showing where all the traffic (FLARM, ADS-B, PCAS) is in the vicinity, as well as navigation and thermal markers (where someone else just climbed). Ballistic chutes of course, so comfort is increased. Kirk 66 -- Dan, 5J |
#6
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New Glider Dream Elon Musk Flow
On Sunday, February 11, 2018 at 6:23:56 PM UTC-6, Dan Marotta wrote:
Well, screw the helmet idea!Â* Who needs the weight?Â* If you're gonna go that far, why not a set of light weight glasses with a bluetooth receiver built in and all of your flight and collision avoidance information focused at infinity through the glasses kinda like a HUD.Â* Cockpit sensors would track the glasses and adjust the picture to the viewing angle. Agree on the weight - what I'm thinking is more like a shell to hold the visor, electronics, mike, earphones, position sensor, cooling fan (why not?). More like a bike helmet than what we used to wear. Glasses are OK but the field of view is limited - If you have tried a Hololens vs Oculus Rift you know what I mean. I would want the "HUD" to have at least 200 degrees of FOV so it would show traffic that I'm not looking directly at. Anyway - all the cool sports wear helmets - chicks dig them! Kirk 66 |
#7
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New Glider Dream Elon Musk Flow
Can’t believe no one has suggested a robotic trailer that rigs/derigs for you.
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#8
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New Glider Dream Elon Musk Flow
On Sunday, February 11, 2018 at 5:16:28 PM UTC-8, WB wrote:
Can’t believe no one has suggested a robotic trailer that rigs/derigs for you. I love it. Tesla has an automatic cable that pugs into car, just don't bend over near it! |
#9
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New Glider Dream Elon Musk Flow
On Sunday, February 11, 2018 at 9:07:16 PM UTC-6, Jonathan St. Cloud wrote:
On Sunday, February 11, 2018 at 5:16:28 PM UTC-8, WB wrote: Can’t believe no one has suggested a robotic trailer that rigs/derigs for you. I love it. Tesla has an automatic cable that pugs into car, just don't bend over near it! Shocking! |
#10
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New Glider Dream Elon Musk Flow
My wish-list of what should be feasible today:
*Pylon or shoulder wing. The Mü31 or a bit more radical. *Ditch Schempp-Hirth drag brakes. They are heavy, complex and require an enormous amount of man-hours to build. Use "crow-foot" flaps instead, a bit like the AS system, but much more extreme. *3-piece wing that's mounted on top of the fuselage. By using such a mid-wing you can drastically reduce structural wing mass. *Use the above to build a 10m2 wing with an AR of 45-50 that's no heavier that today's racing class. Easily do-able with a sparless center wing and pultrusions. *FES, with a raised main gear so you can take-off. *Reduced battery pack for the FES. Replace that with a 5 HP 4-stroke generator and you loose all drawbacks of FES. |
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