Control surface design question

"Montblack" wrote in message
...

)
I tried to get some pics but Goggle is acting up this morning.


http://www.flyingflea.org/docs/SprattControlwing.htm
Here's some pics

Ooohh! That looks scary! g
--
Jim in NC

Chris W wrote:

I'm sure everyone here is familiar with the combination of the
horizontal stabilizer and elevator to make a stabilator. I think I have
even heard of the concept being used for a ruder. My question is has
anyone ever made a plane taking the concept all the way and made a
"wingeron"? My guess is no one has, seems to me it would be difficult
to do and maintain the required strength with out adding a lot of weight.

It's probably not practical for a real plane but I thought it might be
an interesting experiment to try on an RC plane.





Only one I ever heard of would be the Spratt "Control Wing"

Lots of links from Google...

Richard

http://www.flyingflea.org/docs/SprattControlwing.htm

http://www.georgespratt.org/docs/PaulsonArticle.htm

http://www.georgespratt.org/Articles...nianSpratt.htm

http://www.maam.org/aircraft/spratt.htm

members.eaa.org/home/homebuilders/selecting/kits/Spratt%20Controlwing.html

http://wings.avkids.com/Book/Wright/...1_1902t64.html

On Jul 13, 12:18 am, Chris W wrote:
I'm sure everyone here is familiar with the combination of the
horizontal stabilizer and elevator to make a stabilator. I think I have
even heard of the concept being used for a ruder. My question is has
anyone ever made a plane taking the concept all the way and made a
"wingeron"? My guess is no one has, seems to me it would be difficult
to do and maintain the required strength with out adding a lot of weight.

It's probably not practical for a real plane but I thought it might be
an interesting experiment to try on an RC plane.

Have you looked up the "flying flea". The elevator was fixed and the
wing pivoted to provide more or less lift. There were no ailerons but
the wing had so much dihedral it stayed fairly level, even when you
turned with the big rudder. A bunch of them were built in the 1930s,

The first ones had a problem where the wing did not have enough travel
to pull out of a steep dive. It was easy to fix once it was known, but
by that time some people had died and the plane's reputation was not
recoverable.

John Halpenny

The Biplum is an ultralight biplane with a lower wing that swivels
in lieu of ailerons. It may even have a mixer arrangement adjust
the angle of attack too, I don't remember.

http://frederic.secchi.free.fr/ULM/P...ges/Biplum.htm

--

FF

On Jul 14, 11:49 am, John Halpenny wrote:
On Jul 13, 12:18 am, Chris W wrote: I'm sure everyone here is familiar with the combination of the
horizontal stabilizer and elevator to make a stabilator. I think I have
even heard of the concept being used for a ruder. My question is has
anyone ever made a plane taking the concept all the way and made a
"wingeron"? My guess is no one has, seems to me it would be difficult
to do and maintain the required strength with out adding a lot of weight.

It's probably not practical for a real plane but I thought it might be
an interesting experiment to try on an RC plane.

Have you looked up the "flyingflea". The elevator was fixed and the
wing pivoted to provide more or less lift. There were no ailerons but
the wing had so much dihedral it stayed fairly level, even when you
turned with the big rudder. A bunch of them were built in the 1930s,

The first ones had a problem where the wing did not have enough travel
to pull out of a steep dive. It was easy to fix once it was known, but
by that time some people had died and the plane's reputation was not
recoverable.

John Halpenny

The issue with the original flea (the HM-14) was not that it didn't
have enough control travel to get out of a dive but that it had too
much control travel. If you pulled right back on the stick you would
stall the front wing, the back wing would still deliver lift and put
you into a steep dive. Pushing forward too far could put you in the
same position, as can severe turbulence (ie no lift = no tension on
the control cables and the wing slams to the full down position and
stalls).

The earliest Flying Fleas used cables to pull the front wing down and
required the wing to pull up itself. This has problems when the wing
stalled. The fix was to put rigid tubes in place of the cables to the
control column as per the later HM-14e to permit the wing to be pushed
back up to flying position. The original flea (the HM-14) aerofoil
has a sharp leading edge and a consequent vicious stall if pushed this
way.

Recovery required the controls to be centred so the front wing would
start lifting again, once lift was re-established recovery would occur
rapidly and automatically. (This feels very wrong to a pilot trained
on a conventional aircraft, to center the controls in a dive rather
than pull back)

The fleas oversized rudder will put the plane in a 60 degree bank all
by itself.

There are other issues a well with the design regards center of
gravity but this is not the probably forum to discuss them. But the
plans were fixed and the later fleas are quite safe aircraft if you
are aware of the piloting peculiarities.

Regards Allan Gibson