HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Sep 23, 2002, 04:05 PM
Oxymoron: Rap Music
GForceStress's Avatar
Upstate NY
Joined Sep 2002
791 Posts
How important is dihedral.

Uh say I knew a guy who had a flat wing(dihedral). Would it affect flight?

Dave
GForceStress is offline Find More Posts by GForceStress
Reply With Quote
Sign up now
to remove ads between posts
Old Sep 23, 2002, 04:10 PM
Live to ride... and fly!
Tres Wright's Avatar
Forney, TX
Joined Mar 2002
15,165 Posts
==had a flat wing(dihedral). ==

Huh? You can't have both, you either have a flat wing or you have dihedral. Yes, it affects flight. Typically you see flat wings on aerobatic planes, usually with ailerons; and dihedral (or polyhedral) on rudder/elevator ships.
Tres Wright is offline Find More Posts by Tres Wright
Reply With Quote
Old Sep 23, 2002, 05:00 PM
Dude, where's My Plane?
JasonJ's Avatar
Green Lane PA USA
Joined Mar 2001
2,167 Posts
Yeah, if you have a more or less straight Leading Edge wing and a rudder, you will need dehiedral to help bank the plane durring rudder turns and to return it to level flight when you let off the rudder. Even on an aliron ship, with out dehiedral the plane will tend to stay in the roll attiude you leave it in and not return to level flight.
There are exceptions though, if you have a heavy sweep angle in your wing leading edge, like a Delta wing, Zagi, Twinjet, ect, the rear sweep works as dehidral, so dose forward sweep in the wings, like the X-bow.
JasonJ is offline Find More Posts by JasonJ
Reply With Quote
Old Sep 23, 2002, 05:02 PM
Mountain Models Wannabe
CoClimber's Avatar
Ithaca, NY USA
Joined Mar 2001
4,371 Posts
Dihedral buys you two things: roll stability and the ability to turn with a rudder. Once in a bank, a wing without dihedral will stay in a bank but a dihedral wing will self right. The rudder on a flat wing will make the plane yaw but will not lift the wing. With dihedral, the angle of attack on the outside wing will be greater, creating more lift and causing the plane to bank.

On an aerobatic plane, both these things are bad.

Doug
CoClimber is offline Find More Posts by CoClimber
Reply With Quote
Old Sep 23, 2002, 05:46 PM
The effect is sadly temporary
Hippo's Avatar
Ann Arbor, Michigan
Joined Oct 2001
1,675 Posts
Consider this...

Don't forget the best thing about using the sweep effect for dihedral: It works just as good when you're upside down!

-Dan
Hippo is offline Find More Posts by Hippo
Reply With Quote
Old Sep 23, 2002, 07:13 PM
Registered User
Vermont
Joined Mar 2002
2,706 Posts
Sweep works as dihedral? Can the xbow run as a vtail?
fdisk is offline Find More Posts by fdisk
Reply With Quote
Old Sep 23, 2002, 07:49 PM
Crashmaster Extraordinair
Clarksville, TN
Joined Apr 2002
730 Posts
and dont forget anhedral! not only does it make a plane more aerobatic, it provides inverted stability.
Sparr is offline Find More Posts by Sparr
Reply With Quote
Old Sep 23, 2002, 09:55 PM
Leave me alone!
Martin Hunter's Avatar
Kamloops, BC, Canada
Joined Feb 2002
15,106 Posts
Dihedral requirements will vary depending on the position of the wing. For the same stability, you will need less dihedral for a high wing than you would for a low wing. This is due to the pendulum effect the weight of the fuselage has under a high wing.

Martin
Martin Hunter is offline Find More Posts by Martin Hunter
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
How important is slow charging a new pack? houdini Batteries and Chargers 2 Feb 03, 2003 09:45 PM
Pre-build, greasing bearings. How important? Sanman Electric Heli Talk 4 Apr 26, 2002 11:53 AM
how rudder and dihedral cause banking Bob Chiang Power Systems 5 Mar 13, 2002 09:45 PM
How much dihedral NECESSARY on a 'Moth? segal3 Parkflyers 8 Feb 04, 2002 11:00 PM
How important is it to time a Speed 400 motor? Red Baron 47 Electric Plane Talk 4 Jul 12, 2001 12:47 AM