HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jul 13, 2001, 10:41 PM
Question gravity.
KMKAZE's Avatar
Kane County, Il
Joined Sep 2000
1,585 Posts
Need help with ailerons!

I bought 2 $1.99 24 inch wingspan foamies today from K-mart and im sitting here attempting to convert them to speed 400 with 2 micro servos.

Really I have two questions...Is it better to just put a rudder on my conversion or can I go the Aileron route?

...And more importantly,if I use ailerons,I could only use one servo,and to make things worse I cant see any way of using one servo to deflect both ailerons on each wing,so can I get away with one large aileron with lots of deflection on just one wing?

The plane has a wingspan of about 24",so this will probably be a zippy little plane...what do you think I should do,rudder or elev?
KMKAZE is offline Find More Posts by KMKAZE
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 13, 2001, 10:46 PM
Registered User
buckeyes1997's Avatar
columbus, oh, usa
Joined Jun 2001
426 Posts
i usually only use one servo in the middle of the wing with a torque rod setup to deflect both ailerons. it works great.
buckeyes1997 is offline Find More Posts by buckeyes1997
Reply With Quote
Old Jul 14, 2001, 12:32 AM
Now with more COWBELL!
U2Steve's Avatar
United States, KY, Lexington
Joined Mar 2001
804 Posts
You can also use simple music-wire pushrods if you make the control horns slightly tall and mount them on top of the ailerons. Small dowels glued in place with a hole drilled through them work ok. Mount the servo in the middle of the wing and use a double-sided arm, and wire pushrods to each control horn. You may have to reverse the channel for things to work.
U2Steve is offline Find More Posts by U2Steve
Reply With Quote
Old Jul 14, 2001, 04:29 AM
Registered User
Tel-Aviv,Israel
Joined Apr 2001
457 Posts
I did come across an article about a model that flies with only one aileron, and no one could tell by its flying. what you must do is make sure there is no gap in the hinge line, so there won't be any air 'leaks' which decrease the aileron efficency

best of luck
Avi
avie is offline Find More Posts by avie
Reply With Quote
Old Jul 14, 2001, 05:13 AM
T-52 over Seattle
Silver's Avatar
Seattle
Joined Jun 2001
267 Posts
KMKAZE,

I found this picture on JK Aerotech's web site. They are the company that makes the T-52 trainer and other foamies. They have a great picture of their foam Mig-3 that shows the single servo aileron setup.

<a href="http://www.jkaerotech.com/Mig3/migbs45.JPG" target="_blank"><img src="http://www.jkaerotech.com/Mig3/migbs45.JPG height="90"></a>


Hope this helps.


Silver

[This message has been edited by Silver (edited 07-14-2001).]
Silver is offline Find More Posts by Silver
Reply With Quote
Old Jul 14, 2001, 05:51 AM
Registered User
swami's Avatar
Ursel, Belgium, Europe
Joined Jul 2001
181 Posts
Quote:
Originally posted by KMKAZE:
I bought 2 $1.99 24 inch wingspan foamies today from K-mart and im sitting here attempting to convert them to speed 400 with 2 micro servos.

Really I have two questions...Is it better to just put a rudder on my conversion or can I go the Aileron route?

...And more importantly,if I use ailerons,I could only use one servo,and to make things worse I cant see any way of using one servo to deflect both ailerons on each wing,so can I get away with one large aileron with lots of deflection on just one wing?

The plane has a wingspan of about 24",so this will probably be a zippy little plane...what do you think I should do,rudder or elev?

I would use ailerons.
If it's really hard to make the 2 ailerons work, you can use just one. (expect a little less response unless you use more deflection)

NOTE to the picture in Silver's reply: You see the 3 holes on each side in the servo-disk? If you use the holes closest to the trailing edge, the upward deflection is going to be greater than the downward deflection.
This means that the side you turn to is going to have a little more drag than the other side.
This is a good thing since it makes the plane turn a little more smoothly. (like making a turn with the ailerons and using that little touch of rudder)

BTW: 24 inch isn't all that much.
Have you considered Speed 280?
It would be much lighter.
swami is offline Find More Posts by swami
Reply With Quote
Old Jul 14, 2001, 08:35 AM
"Bible Thumper"
AMTJIM's Avatar
United States, AZ, Tucson
Joined Mar 2001
1,924 Posts
I have done so many of these, don't bother with the 400, way to heavy. A direct drive 280 or smaller is a better option. B-2 motors mounted on the wings in pusher config with 7 150mah cells is great fun. Ailerons and rudder both work great.
AMTJIM is offline Find More Posts by AMTJIM
Reply With Quote
Old Jul 14, 2001, 10:00 PM
Registered User
Larry Dudeck's Avatar
Williamsville, NY, USA
Joined Sep 2000
4,500 Posts
Perhaps a little known fact about ailerons on full size aircraft.

It's the ailerons that turn the plane, the rudder is used to cancel the plane's tendancy to yaw toward the higher wing.

I would think this would hold true for R/C planes as well. But I have flown R/E and A/E planes and they both turn just fine.

Larry Dudeck is offline Find More Posts by Larry Dudeck
Reply With Quote
Old Jul 15, 2001, 01:37 AM
Registered User
Joined Apr 2001
284 Posts
If you use ailerons reduce the dihedral to near zero. It will reduce aileron performance if you don't.
-fish
fisher is offline Find More Posts by fisher
Reply With Quote
Old Jul 15, 2001, 03:29 AM
Registered User
San Diego, CA, USA
Joined Aug 2000
525 Posts
Using one aileron on a very light bird may be problematic as the one aileron would create a lot of drag.
Spam is offline Find More Posts by Spam
Reply With Quote
Old Jul 18, 2001, 12:15 PM
RPV builder & operator
Pierre Audette's Avatar
Canada, QC, Gatineau
Joined Jan 2001
2,303 Posts
I've got a sport 400 with oversized ailerons. Big mistake for my flying abilities. After one of my numerous crashes, I lost the ball joint to one of the torque rods. So I taped up the wounded aileron, and flew it on only one aileron. Roll rate was slower, but better for my taste, which made the plane easier to fly.

The trick with a single aileron is that it needs to be large enough, with enough throw to work properly. There are in fact some pylon racers which are designed with only one aileron, mainly to reduce drag. It's on the left side, which most likely makes it's more efficient to 'go fast & turn left'. Creates more drag only on the left side, so which helps it turn faster in that direction. The downside is that rolls aren't very axial anymore.

I also bought a pair of 24" cheap gliders. I was thinking of using just the wings for a bipe. Anyone else tried a cheap foamie bipe yet?
Pierre Audette is offline Find More Posts by Pierre Audette
Reply With Quote
Old Jul 19, 2001, 01:34 AM
Registered User
United States, VA, Warrenton
Joined Apr 2001
1,148 Posts
Larry,

The only reason a R/E plane is able to turn is because the dihedral of the wings causes the plane to bank to stop the plane from slipping through the air. It is still the bank that gets the plane through a turn.

Theoretically, I would think a plane with no ailerons and no dihedral would never turn, but just slip through the air. Wouldn't that be a peculiar site.

-Ninjak2k
Ninjak2k is offline Find More Posts by Ninjak2k
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Need help with Eclipse 7 programming - Acro/Glid and Thottle/Ailerons jbachman Electric Sailplanes 2 Jan 29, 2007 01:33 PM
Need Help with Sluggish Ailerons...! Boss248 3D Flying 13 Dec 03, 2004 12:00 AM
I need help with motor timing. jtthebiggafigga Electric Plane Talk 3 Jun 10, 2001 12:12 AM
Need help with 400 for park flyer Cpietro Electric Plane Talk 2 May 21, 2001 02:35 AM