[NSRCA-discussion] Air Breaks

[brett terry]

the spoilerons decrease the apparent AOA of the wing, in essence giving the
wings "washout" effect.  If I remember correctly, at the same speed there is
actually less flow separation with the spoilerons activated, despite the
decrease in total lift.  The effective wing loading increases (relative to
the amount of lift generated), but the wing is simultaneously resistant to
tipstalling and the plane's ability to penetrate increases.  Perhaps the
decrease in chordwise flow separation precludes the vortices which create
spanwise flow?  I am just speculating at this point.

Back when I flew slope soarers some of my lighter planes would not land
without spoilerons deflected.  The rotor would just toss them about with
devastating results.  With the spoilerons up the plane would punch right
through and was much less likely to tipstall.

I also had little luck creating an elevator mix.  I haven't tried the
spoilerons on a pattern plane for many years now, but I remember some planes
pitched up while others pitched down, and the rate and magnitude of pitch
change was speed-sensitive.

On 5/13/06, Ed Deaver <divesplat at yahoo.com> wrote:
>
> I use the "spoilers" as we call them a little different than has been
> mentioned.
>
> Use 10-25% up ailerons but I don't mix in any Elevator.  My reasons are
> simple, don't need it for landing.  As I am flying the downwind leg and
> activate the spoilers the plane pitches up, and actually have used them for
> spins on very calm days, but as soon as the plane slows down a bit it flies
> level.  For me to add the mix in destroys the glide path I like.
>
> The spoilers do have a very noticeable effect on cross wind landings
> suprisingly, eliminating a lot of the choppy effect but I don't understand
> why.
>
> Have done this method on 3 different style planes all with the same
> result.
>
> ed
>
>
> *John Pavlick <jpavlick at idseng.com>* wrote:
>
> Bill,
> What plane are you trying this on? I have my both my Focii set up with
> this
> and I like it. I use ailerons up and down elevator. In Futaba land I have
> +30% Flaps (ailerons up) [= ~ 5 degrees] and -20% elevator (down) but
> you'll
> need to experiment. On some planes I use very little down elevator in the
> mix, I just do it manually when I land. I found that using the "airbrakes"
> helps me to be able to transition into a nearly flared condition very
> early
> on final without worrying about any tip stalling. You basically head
> downwind, chop the power, hit the airbrakes and point the nose down. When
> you get close, start to raise the nose and bleed off speed. You can then
> drag the plane to the mark with a little power if you need to. Try it at a
> field where you have some room. You may find that you undershoot the first
> few landings until you get used to how the plane comes down with the
> airbrakes on.
>
> John Pavlick
> http://www.idseng.com
>
>
> > -----Original Message-----
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of
> > Bill Markovitz
> > Sent: Saturday, May 13, 2006 10:00 AM
> > To: nsrca-discussion at lists.nsrca.org
> > Subject: [NSRCA-discussion] Air Breaks
> >
> >
> > I'm interested in using the air brake function for
> > slower and more controlled landings. Any suggestions
> > for a starting point on the aileron and elevator
> > throws would be appreciated. Is it better to have the
> > ailerons up and the elevator down or the ailerons down
> > and the elevator up?
> >
> > Thanks, Bill :)
> >
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