| Title: | Welcome To The Radio Control Conference |
| Notice: | dir's in 11, who's who in 4, sales in 6, auctions 19 |
| Moderator: | VMSSG::FRIEDRICHS |
| Created: | Tue Jan 13 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1706 |
| Total number of notes: | 27193 |
I get bored quite easy, so I decided that with my oldest kit I would
experiment a little and this note is about just that.
Since I did not see note on this subject. I will start one. I
appologize to the aeronautical engineer if some of the ideas coming out
of this note seems "candid".
If some of you have been experimenting let us know what you did or want
to do.
As for me I would like to try something this summer.
I notice that the early airplane design made the whole wing flex to get
the aileron effect. I have been wondering what would happen if I cut
the tips of my wings and arrange them so that they can rotate, running
a shaft in the center of the wing and activating it with a servo so
that each tip rotate in a different direction. Would this be more
effective then ailerons, simpler to do or no difference at all. I have
a SIG Klipper with foam wing which I would like to modify for this
purpose.
Has anybody tried something like this before?.
Jacques
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1325.1 | Try it and report back | ELMAGO::TTOMBAUGH | A Fistful of Epoxy | Wed May 15 1991 14:28 | 19 |
Jacque,
The system you describe is usually called "wingerons", and is used
on several different types of slope gliders.
Normally the entire wing rotates on a shaft, not just the outboard
section. This causes a very powerful aileron/banking action and
is useful for making the sudden pylon turns in a slope racing event.
It is hard to control the amount and rate of roll when used in a slower
flying thermal design. The few scratch built thermal designs that
I have seen attempt to use wingerons, have been near disasters in
the air.
However, your idea of pivoting only the outboard area of the wing
may be feasible. Only way to find out is to try it.
My guess would be that the large induced drag would be a efficiency
killer in the turns, but you wouldn't need much surface deflection
to get good roll response.
Terry
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| 1325.2 | Try it this way... | NEWOA::WINSLADE | Wed May 22 1991 08:11 | 16 | |
If you try this, the pivot wants to be around 25% - 35% of the mean
chord of the surface to be deflected, to reduce servo loads and the
likelihood of flutter. Pivotting at the centre will put the aerodynamic
load ahead of the pivot.
Incidentally, a few years ago here in the UK, someone tried this
except that both tips were free to pivot in unison, and the servo's
function was to change the angle between them. The theory was that they
would take up the angle of least resistance against the airflow, with
the difference in incidence between them giving the roll control.
It was supposed to work quite well....on the other hand nothing has
been heard of the idea since.
Best of Luck,
Malcolm
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| 1325.3 | I'd be concerned about the servo load | ZENDIA::REITH | Jim Reith DTN 226-6102 - LTN2-1/F02 | Wed May 22 1991 09:10 | 6 |
Model Aviation (the AMA magazine) had a slope soaring plane in it (as a
construction article) that used wingerons. The wings pivoted at the
root. If you don't have access to back issues of MA, someone in here
can probably remember to bring it in and copy the article (my brain
doesn't wake up until I'm at work so I always forget stuff like that in
the morning)
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