If you tape a "soda straw" at the trailing edge (outboard) with packing tape,
you ca get an idea of how a small trim tab will affect the heavy wing. It is
quick and easy, and will tell you if a large tab may be needed. The extra fuel
in one tank though sounds like the logical solution ... All my airplanes fly one
wing heavy until I transfer my Big ^&* to the other seat! Then of course
they fly with the other wing heavy... I'll be putting the "left-right-both" fuel
valve in my Rebel.
On 3/13/2007 8:36 PM,
beep@sympatico.ca wrote to rebel-builders:
->
-> Hi Mike !
->
-> Aaaaaaahh ! You have the droop tips !! -- I was wondering how
-> you could have enough variation between tips to have a roll problem
-> with the standard Elite tips ... it would be VERY unusual, because
-> they are so short .... Now we have an explanation !!
-> It only takes less than 1/4" variation in tip angle to give
-> noticeable roll input - and the droop tips are a lot longer
-> than the standard tips !
->
-> If you cut a strip of Lexan, about 2" wide, and maybe 8"
-> long, and bend one end down a bit over 90 degrees, about 1"
-> from the end, then bend that section about 1/2" from the end
-> so that it is parallel with the longer section, you have the
-> shape. It will look like a slightly flattened "Z", except the top
-> leg will be much longer. A couple of rivets at the front and
-> back will hold it to the tip - it should be as far out as possible,
-> just inside the drooped part.
->
-> What that gives you is a long ramp that slopes down 1/2"
-> or so, with a leg at the back to support it. The measurements
-> are very vague, as this will be a matter of 'cut & fit' and test -
-> you might want to just tape it in place initially. Use strong,
-> wide tape !! :-)
->
-> It may well be that a 3" wide strip with just 1/4" rise
-> will be more than enough .... or a strip 1" wide even ...
->
-> I would only try that IF an extra 1/4 tank of fuel on the
-> light side doesn't help -- OR if going to full reflex flap doesn't
-> help. If you were wanting to run without the reflex because
-> of roll input, then I would definitely adjust one flap down to
-> level things. It should fly well with the flaps all the way up -
-> this should give you about 128 - 132 mph cruise with 180 hp.
->
-> Which way does it roll ??
->
-> Just had another thought - if the drooped part is solid glass,
-> you could maybe just run a grinding wheel along the bottom of
-> the drooped part at the back, on the wing that wants to go UP.
-> That would reduce the angle at the rear of that tip by 1/8" - 1/4",
-> and might be enough to stop the roll .... Might as well use that
-> drooped piece as a ramp - it certainly does nothing for the
-> aerodynamics ! (If it went up, like a winglet, it would be
-> beneficial - going down just reduces roll stability ....)
-> (Before anyone yells --- this is just MHO ... ;-) )
-> (Anybody ever seen a high-performance glider, or a jet,
-> with droop tips ??!!! :-) ) (How about winglets ??) :-)
->
-> --
-> ......bobp
->
http://www.prosumers.ca
->
http://bpatterson.qhealthbeauty.com
->
http://apatterson2.qhealthzone.com
->
-> -------------------------------orig.-------------------------
-> On Wednesday 14 March 2007 00:02, Mike Betti wrote:
-> > Good information Bob, I like the lexan idea if I understand it correctly.
-> > Could you give me a little more detail on the lexan at the wing tip? How
big
-> > of a piece? Where? Mounted how? I have the droop tips.
-> > Thanks,
-> > Mike
-> > ----- Original Message -----
-> > From: "Bob Patterson" <
beep@sympatico.ca>
-> > To: <
rebel-builders@dcsol.com>
-> > Sent: Tuesday, March 13, 2007 2:11 PM
-> > Subject: Re: [rebel-builders] Elite - Flying time
-> >
-> >
-> > >
-> > > Hi Mike !
-> > >
-> > > Feels great, doesn't it !! :-)
-> > >
-> > > You can run the flaps faster in notch 1 - but why ???
-> > > I always go to negative (2 notches) on the Rebel, as soon as I'm
-> > > done climbing ! It makes it more stable, and a bit faster.
-> > > You may find a small roll change with flaps in different
-> > > positions - it's not unusual .... You should be landing WITH
-> > > flaps in ALL wind conditions !! At least 2 notches....
-> > > People often make the mistake of trying to fly Murphy's
-> > > like Cessnas - they are different aircraft !
-> > >
-> > > It's always better to lower a flap a bit, rather than raise the
-> > > opposite one - adding to lift ! How heavy IS the wing ?? It is
-> > > standard practice to keep about 1/4 tank more fuel on the
-> > > lighter wing .... to help with balance. Maybe that's all you
-> > > need. A small Lexan ramp on the bottom of one wing tip
-> > > will also give good results.
-> > >
-> > > Rudder trim tab is best in the center - lower is partly
-> > > blanketed by the fuse & stab. A longer tab is better than a
-> > > short, wide tab.
-> > >
-> > > FWIW, I have always added internal aileron trim to my
-> > > Rebels - this is simply a bungee cord from the right side
-> > > stick base hole in the cross tube, running up to the left
-> > > stick, wrapped 2 or 3 turns & hooked to itself. To trim,
-> > > just slide the bungee coils up or down the stick to add
-> > > tension to pull the stick to the right. This is the same setup
-> > > used on gliders for years, and does a great job of fine-tuning
-> > > the trim for long flights. We can often fly for literally
-> > > HOURS without touching the stick. Of course, you
-> > > will have to be much more attentive to the elevators
-> > > with the Elite ... especially on bouncy days.
-> > >
-> > > --
-> > > ......bobp
-> > >
http://www.prosumers.ca
-> > >
http://bpatterson.qhealthbeauty.com
-> > >
http://apatterson2.qhealthzone.com
-> > >
-> > > -------------------------------orig.-------------------------
-> > > On Tuesday 13 March 2007 00:42, Mike Betti wrote:
-> > >> Hi all,
-> > >> Finally getting some time in my Elite this weekend. The wind finally
quit
-> > > gusting around here for the time being anyway. Have about 3 hours
logged
-> > > and
-> > > got the landing down pretty well now. I can see the need for some
weight
-> > > in
-> > > the back seat to get that tail down, but able to make nice no throttle
-> > > landings as is.
-> > >> Can I run the flaps in notch 1 beyond flap speed since they are
actually
-> > >> in
-> > > the nuetral position at that point? Flaps at 0 is reflex.
-> > >> Also looking at drooping a flap to get rid of a heavy wing. Does it
help
-> > >> to
-> > > raise the opposite or should I just droop the heavy one?
-> > >> Also added a trim tab to elevator to help with lack of offset. I been
-> > >> told
-> > > to mount it at 1/2 way point on rudder. I notice many certified planes
-> > > have
-> > > this toward the bottom. Could it be more effective say inline with the
-> > > stab?
-> > >> Thanks,
-> > >> Mike Betti
-> > >
->
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