kaitak744
Posts: 2092
Joined: Fri Jul 22, 2005 1:32 pm

Plane Constuction Help

Sun Sep 03, 2006 5:27 am

For a science project, I am in an event where I am supposed to make a plane with a wing span of 50cm, maximum wing chord of 7cm, maximum stabilizer span of 30cm, and maximum stabilizer chord of 4.5cm. It will be powered by a single propeller which is turned by a rubber band (which is winded before flight). The objective is to have it fly for the longest possible time (before any part of the plane touches the ground). Now, does anyone have any design recommendations?

So far, I was thinking of 787 style wings with raked wingtips, but I don't know if that will be so good for a plane going this slow.

Thanks in advance for the help.
 
sv2008
Posts: 591
Joined: Tue Aug 29, 2006 11:05 pm

RE: Plane Constuction Help

Sun Sep 03, 2006 5:46 am

I doubt it would make any aerodynamic difference, but it might win points for style.
 
jetmatt777
Crew
Posts: 2902
Joined: Sun Jun 26, 2005 2:16 am

RE: Plane Constuction Help

Sun Sep 03, 2006 1:31 pm

Obviosly you need to build a high lift wing. Try to find a picture of an eagle's wing. they can fly for hours without flapping they're wings.

Good luck and hope you win the competition.  bigthumbsup 

-Matt  Smile
Lighten up while you still can, don't even try to understand, just find a place to make your stand and take it easy
 
RichardPrice
Posts: 4474
Joined: Sat Apr 23, 2005 5:12 am

RE: Plane Constuction Help

Sun Sep 03, 2006 6:47 pm

Quoting Jetmatt777 (Reply 2):
Obviosly you need to build a high lift wing. Try to find a picture of an eagle's wing. they can fly for hours without flapping they're wings.

Thats mainly because they find the thermals and sit on them for hours on end, hence one of the main reasons for their massive wing area.

Personally I would dump all examples of powered flight and go and take a look at gliders. They have a fantastic glide ratio, and THATS whats going to win the competition here, not the period while the aircraft is under power.
 
QFA380
Posts: 2013
Joined: Fri Jul 22, 2005 4:38 pm

RE: Plane Constuction Help

Mon Sep 04, 2006 5:16 am

What are you making it out of?
 
kaitak744
Posts: 2092
Joined: Fri Jul 22, 2005 1:32 pm

RE: Plane Constuction Help

Mon Sep 04, 2006 11:43 am

Quoting QFA380 (Reply 4):
What are you making it out of?

Well, anything really at this point. I have not firmed anything yet. But most likely it will be balsa wood and tin foil.

Oh, I forgot to mention a few things, sorry. The plane can't be a pre-built kit. I need to make it from scratch. This does however give me alot of design flexibility. Also, I have a prop which is about 18cm in diameter and 1.5 cm in chord. Sounds good enough for a plan this size right?

By the way, Sv2008, Jetmatt777, RichardPrice, and QFA380, thank you very much for your help so far.
 
QFA380
Posts: 2013
Joined: Fri Jul 22, 2005 4:38 pm

RE: Plane Constuction Help

Mon Sep 04, 2006 3:41 pm

Make sure you find some good designs for wings adn fuselage, taht can definitely make a difference even if it's only slight. I had a very short look around and here is something you can have a look at to get some ideas about how gliders work and stuff.

http://www.howstuffworks.com/glider1.htm

Also, I suggest getting something that is very light for the fuselage, for the wings though you should have something that is strong and light. For the fuselage I would recommend styrofoam, light kind of strong but the only problem is getting it aerodynamic enough.

Hope this has helped slightly and make sure you post a pic when you have finished.

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