Recent content by paults2

Try the NASG site. They have polars for many airfoil shapes. http://www.nasg.com/afdb/list-polar-e.phtml UIUC also has lift and moment data (vols 1 to 3): http://www.aae.uiuc.edu/m-selig/pub/lsat/ Airfoil comparison: http://soaring.cnde.iastate.edu/calcs/frames.shtml...

They said in the post-flight press conference that it achieved positive thrust. Pretty good accomplishment considering this was an engine contained within a vehicle that flew on its own.

NASA is doing a test today (3-37-04) of the X-43 attached to a B-52. If you have access to NASA TV, check it out right now. I'm watching right now on NASA TV.

Yes, SSTO is not easy. Trying to add a significant amount of enthalphy to the gases with an airbreathing engine at hypersonic speeds is tough. Nonetheless, there was a great deal of progress made during the X-15 program. It would have been great if that project and ones similar to it had...

Drag, you won't understand much if you draw conclusions based on one picture and are not willing to listen to other people's views. What Bush is proposing is a farce. We can't go to Mars on a 1% a year incease in the NASA budget and by trying to save some bucks by abandoning the ISS and...

That's due to the wing vortex, which is a result of the lift distribution. Often the tip vortices are more noticeable than the wing vortex. http://home.flash.net/~lauras34/sav15a.jpg

http://www.cnn.com/2004/TECH/space/03/04/glenn.space.reut/index.html

Ken, I don't know if you're familiar with the motocalc software. It's made for modeling performance of rc airplanes. Among other things, it calculates a table of thrust vs. rpm, prop make and type, and airspeed. It also estimates airframe drag. They give a 30-day free trial. It's made...

The following page shows a nice animation of how a tuned exhaust two-stroke works (2nd pic from top). This doesn't apply directly to four-strokes. http://www.coolskunk.com/two_stroke_engine.htm It takes a minute or two for the animation to load.

One has to question how sincere Bush is about the Moon and Mars missions. He didn't even mention them in his State of the Union address, although he took the time to talk about a Constitutional amendment banning gay marriages. The admin is concerned about the fact that the Chinese recently...

Here's another report from the NACA server that discusses relations between airspeed, thrust, rpm, and engine power: NACA Technical Note 237 Propeller Design: A Simple System Based on Model Propeller Test Data III Fred E. Weick May 1927

The measurement you did on your engine gives only the thrust at zero airspeed, which is 9.5N. It doesn't give the engine power. For comparison, the power for a 2.5cc OS Max engine is listed on the OS website as 0.41 brake HP at 17,000 rpm, which is about 306 W. This is a maximum power and...