Build collections of Super-Powered Bookmarks (we call them Jetpaks™) to save or share your web searches!
Tue, 15 Apr 2008 20:53:09 GMT
Jet Packs Are the shit
Jet Pack Sale
51. RE: Jet Packs Finally On Sale: How to Buy Your Rocket Belt
Yes, my contact info- e_totherow@yahoo.com The person talking about the 70 hp recipricating power plant with two side by side rotating airfoils over head- Great idea, now lets look at the ups and downs to a design like this...On the positive side, this design would cost less to design and manufacture, because much of the technology and concepts already exist. In other words, much less of a design and analysis schedule would need to be implimented. Another plus is fuel consumption. Now you're talking 9 litres an hour, not minute! That's great, considering this type of propultion! I could go on and name many other up sides to this design, such as the benifit of natural ballancing, due to such a large seperation of the power source from the lifting source, not as easily attainable with rockets, turbines, or jets...unless you vent the exaust- which would cause parasitic drag, plus back pressure, making for hotter engine start ups and a less efficient system. (hot start = bad) etc...Now for the questions to be answered about your design- Remember, there has to be ballance to a system like this, not only for all practical reasons ie, keeping your butt below you, but also in the way the blades generate lift! The two blades must produce similar amounts of thrust in an atmosphere that WILL change from inch to inch as you fly through the air. How will you off set this dissymmetry of lift from an 'un even' atmosphere, especially in forward flight? Will the blades be variable pitch? They don't have to be. We also have the issue of 'sharing' turbulent air from one spinning prop to another. One little gust of wind could rob one half of your rotor system of vital lift. As blade tips spin (or create lift of any kind), they create little votex rings of horizontally spinning air that can get pushed into your other airfoil, causing it to loose lift. No more ballance! How will you stop this cross contamination of turbulence? It's possible...This is the perfect design to be optimized with the use of a gas angle on the intake side of your two props! Check out the tail totor of a new EC 120 helicopter to help visualize what I'm talking about. Not everyone uses the concept, but you can squeeze a little more performance out of your rotor system! You must make sure the props are rigid! So much goes into the designing process, but this design is simple enough in concept to be approached by a rather crafty, mindful, and organized hobbyist! It's a cool idea, get to work! e
Yes, my contact info- e_totherow@yahoo.com The person talking about the 70 hp recipricating power plant with two side by side rotating airfoils over head- Great idea, now lets look at the ups and downs to a design like this...On the positive side, this design would cost less to design and manufacture, because much of the technology and concepts already exist. In other words, much less of a design and analysis schedule would need to be implimented. Another plus is fuel consumption. Now you're talking 9 litres an hour, not minute! That's great, considering this type of propultion! I could go on and name many other up sides to this design, such as the benifit of natural ballancing, due to such a large seperation of the power source from the lifting source, not as easily attainable with rockets, turbines, or jets...unless you vent the exaust- which would cause parasitic drag, plus back pressure, making for hotter engine start ups and a less efficient system. (hot start = bad) etc...Now for the questions to be answered about your design- Remember, there has to be ballance to a system like this, not only for all practical reasons ie, keeping your butt below you, but also in the way the blades generate lift! The two blades must produce similar amounts of thrust in an atmosphere that WILL change from inch to inch as you fly through the air. How will you off set this dissymmetry of lift from an 'un even' atmosphere, especially in forward flight? Will the blades be variable pitch? They don't have to be. We also have the issue of 'sharing' turbulent air from one spinning prop to another. One little gust of wind could rob one half of your rotor system of vital lift. As blade tips spin (or create lift of any kind), they create little votex rings of horizontally spinning air that can get pushed into your other airfoil, causing it to loose lift. No more ballance! How will you stop this cross contamination of turbulence? It's possible...This is the perfect design to be optimized with the use of a gas angle on the intake side of your two props! Check out the tail totor of a new EC 120 helicopter to help visualize what I'm talking about. Not everyone uses the concept, but you can squeeze a little more performance out of your rotor system! You must make sure the props are rigid! So much goes into the designing process, but this design is simple enough in concept to be approached by a rather crafty, mindful, and organized hobbyist! It's a cool idea, get to work! e
From: http://www.popularmechanics.com/technology/transportation/4217989.html
Jet Pack - 2 New Rocket Belts On Sale - Personal Flying Machine - Popular Mechanics
Jet Pack - 2 New Rocket Belts On Sale - Personal Flying Machine - Popular Mechanics
Jet Pack Video
From: http://www.youtube.com/watch?v=THEcWrznicY&feature=related
Jet Pack Man Video
From: http://www.youtube.com/watch?v=2gcurwcPs3U
http://www.ohgizmo.com/wp-content/uploads/2007/06/jetPI.jpg
Summary: http://www.ohgizmo.com/wp-content/uploads/2007/06/jetPI.jpg
From: http://www.ohgizmo.com/wp-content/uploads/2007/06/jetPI.jpgLast Modified: 04/15/08 | Email Jetpak | Atom Feed