Flight Times

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Re: Flight Times

Post by blue cobra » March 28th, 2010, 9:11 am

illusionist wrote:does anyone have an idea as to where i can get curved wing ribs to create the aerofoil?

IMS sells them.

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Re: Flight Times

Post by illusionist » March 28th, 2010, 10:42 am

Will having an aerofoil give me a large advantage? Is it going to significantly improve the flying ability of the airplane?
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Re: Flight Times

Post by blue cobra » March 28th, 2010, 11:28 am

I believe you can fly on a flat wing, but it has to be at a high AoA, which means a lot of drag. I believe it flies similar to those light rc planes that fly basically solely on thrust from the propeller and the ailerons. Many people on here know more about the physics involved with airfoils, but I'd say you definitely want to use an airfoil to be competitive. I'm not sure what's making people think of using a flat wing, since real planes and every plan I've seen use airfoils.
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Re: Flight Times

Post by eta150 » March 28th, 2010, 12:14 pm

There was a document link posted somewhere that describes the lift given by an aerofoil, but the gist of it is that the differences in air pressure cause it to rise. Therefore, the lift is much better and the rag is lower (for the amount of lift).
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Re: Flight Times

Post by jander14indoor » March 28th, 2010, 7:44 pm

illusionist wrote:does anyone have an idea as to where i can get curved wing ribs to create the aerofoil?
Cut them yourself. Its easy once you see how.

Make a pattern (a simple arc works fine for these planes, simplex curve is nice too) from heavy poster board, mat board, illustration board, the back cardboard off a notepad. Start with a simple rectangle, say 3-4 inches wide by the longest rib you want (say 15 cm) Now, along the 15 cm edge draw a nice smooth curve (you can print out a curve from you 'puter and paste it on the cardboard). Cut along that curve as smooth as you can. Harden by soaking it with thin CA. Sand smooth.

Now, take a rectangle of balsa as long as your rib. Grain should run along the length of the rib. Cut along your pattern so that rib length edge is now curved. Slide the pattern down 1/16 to 3/64 of an inch (or per plan). Repeat cut. You now have a nice curved rib piece. Slide down again, repeat cut. Another rib. And so on.

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Re: Flight Times

Post by Draylon Fogg » March 31st, 2010, 3:03 pm

Ok just to verify, what is everyones prefered band size??
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Re: Flight Times

Post by eta150 » April 2nd, 2010, 10:40 am

For rubber bands? you have to trim your plane yourself to find out. It seems like a lot of people are flying on rubber a little above 0.090" though.
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Re: Flight Times

Post by blue cobra » April 3rd, 2010, 3:16 pm

I got my personal best time today with 2:14.50
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Re: Flight Times

Post by Chantofox » April 4th, 2010, 9:52 pm

Congratulations, mine was about 2:18
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Re: Flight Times

Post by YadoMestor » April 5th, 2010, 7:40 am

Wow, those are really nice times.
How high were the ceilings?

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