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From: | onefastdaddy |
Subject: | Re: [Paparazzi-devel] Quad Tilt Rotor using Lisa/M |
Date: | Fri, 17 Jan 2014 15:00:59 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
What is the expected max speed during airborne deployment? I was thinking something like wingsuits for skydivers that inflate with air pressure. A structure like arms swivel out and create the wings..air fills the holes and make the airfoil. I imagine if it was self righting (in case it lands upside down) you could just use wire legs extended as landing gear to point the nose up enough for vertical takeoff. Likely enough air could be blown into the wings to inflate them from the front propeller. Just thinking out loud. This way you have flexible retractable wings that could enable very high speeds during deployment. Another thought. Maybe once on the ground a quad is built into this that can separate from the lander and fly off again to one or many other locations. Sort of lunar lander type thing. Deploy from altitude at high speed, winged flight to the ground. Right itself. If you need to re-deploy the top half is a complete quad rotor that separates and flies off. At the end of the mission(s) do you need it back? Is it expected to go back up or is it a ground based recovery? -David On 01/17/2014 02:34 PM, Richardson,
Mark E C1C USAF USAFA CW/CS13 wrote:
Hey Reto, We came up with our prototype requirement based on a combination of customer needs and what we believed we could develop in the time frame. I must mention that the mission profile is almost exactly how you've said; but instead of just landing and being done, having the capability to take off again to go to different areas. Our customer has asked not to publish the requirements on line so I cannot go into too much detail on this setting but I can discuss them with you in a private setting. We have considered the motorized parachute (powered paraglider) but as you have said, flying with a paraglider wing is inefficient. Also, since we would like the ability to move after landing, getting the wing to inflate just right for a takeoff would be a big challenge. We have not considered a gyrocopter, this is basically for the same reason we couldn't go with just a deployable quad, it is not capable of sustaining a glide. I did see one video of a copter/plane that some company developed http://www.youtube.com/watch?v=vBfW4mbrodA which would almost fit our entire profile; however, just like the VERTI4 it cannot fit in a small space. Helicopter was the same way... range is insufficient. So I described this prototype to be launched and deployed with the help of a drag chute, for our prototype purpose, that is just fine. However, once perfected and having the ability to inflate the wings in fractions of a second we would it could to autodeploy without a chute. Thanks for the tip on the Vtail, I will incorporate that onto our final prototype. David, The landing requirements are anywhere from an open/deserted environment full of whatever nature has to an urban environment - atop houses/buildings. And this thing? https://www.facebook.com/photo.php?fbid=10152152603155874&set=a.101521526029 05874.1073741834.590205873&type=3&theater we are actually considering building a carbon wing like the one on it for out prototype. Its pro/s compared to the inflatable wing are : no need for CO2/inflating mechanism lower possibility of damage if props strike wing lighter than inflatable wing however, as you can see on the second image, in order for the wing to fold it is made up of a couple of layers on a mold of the airfoil without an internal structure -- although this is doable, I doubt we can get as much efficiency as with the inflatable wing, even in a final model. I would like to clarify that although we are attempting to have a flying prototype by may, it does not mean it has to be perfect; in fact, our only job is to really present this tour customer and for them to decide wether or not the idea is worth developing further. Thanks to all! --Mark |
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