[NSRCA-discussion] YS Questions+more - Rolls

[Koenig, Tom]

My head is spinning!!! The more I think about this, the more questions I
have.........rather than answers!

Maybe the contra rotating prop set up on a Voodoo X( Nat??) maybe the
answer??

I still 'feel', that the best rolls I get are with a 0 differential set
up-BUT- somehow I 'drive' that wing to 0 ( or should that be some sort
of equilibrium??) during the rolls. Certainly in my case, it seems to be
Pilot dependant!!!
I'm starting to think that my rudder control has turned to the
proverbial trying to micro analyse what's happening!

Tom

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
shinden1 at cox.net
Sent: Friday, 7 March 2008 9:15 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] YS Questions+more - Rolls

what happens on a 4piont?
Bryan
---- Del Rykert <drykert2 at rochester.rr.com> wrote: 
> The general consensus has been that the faster moving molecules over
the top surface don't require as big as a deflection as the aileron that
deflects towards the bottom of the plane. What one tries to achieve is
the plane tracks as purely straight on a string as possible while one
rolls both directions without introducing any yaw. 
>  
>     Del   
> 
> ----- Original Message -----
> From: <glmiller3 at suddenlink.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Thursday, March 06, 2008 2:49 PM
> Subject: Re: [NSRCA-discussion] YS Questions+more - Rolls
> 
> 
> > Nat and all you other aerodynamicists,
> > 
> > I thought that the rational for "aileron differential" was that
upward deflection causes more drag than downward deflection so to
equalize drag and prevent yaw with aileron deflection, aileron
differential is needed.  It seems that you guys are now saying that
ain't so.  Please elaborate.
> > 
> > George
> > 
> > ---- Nat Penton <natpenton at centurytel.net> wrote: 
> > 
> > =============
> > IMO center hinged or top hinged is OK. With top hinge, to achieve
equal vertical travel of the trailing edge requires different angular
travel, up vs down. The objective is zero aerodynamic differential.
> > 
> > Ron I don't think a fairing would prevent separation but, how are
you able to fair the gap using the top hinge ?            Nat
> >  ----- Original Message -----
> >  From: ronlock at comcast.net
> >  To: NSRCA Mailing List
> >  Sent: Thursday, March 06, 2008 7:20 AM
> >  Subject: Re: [NSRCA-discussion] YS Questions+more - Rolls
> > 
> > 
> >  And while your at it, I'd appreciate some discussion of the impact
of the top hinge system as seen on Viavat, and Prestige birds -     (top
hinged, with fairing that eliminates the gap at deflection)
> > 
> >  Thanks, Ron Lockhart
> > 
> >    -------------- Original message -------------- 
> >    From: vicenterc at comcast.net
> > 
> >    Nat,
> > 
> >    Could you explain why the differential should be different for
non-center hinged?  I understand that the mechanical configuration of
non-center hinged requires differential to obtain same travel in both
directions.  However, the travel up and down should be close to equal.  
> > 
> >    Thanks,
> > 
> >    --
> >    Vicente "Vince" Bortone
> > 
> >      -------------- Original message -------------- 
> >      From: "Nat Penton" <natpenton at centurytel.net>
> > 
> >      Tom
> >      It's just something that is peculiar to the Southern
Hemisphere.
> > 
> >      Changing wing incidence will not help. Unless things are really
screwed up <G>, at our roll rates, centrifugal forces are too low to
cause a problem. You want zero differential, aero speaking ( same
up/down if center hinged ).
> > 
> >      I find the best check is the fast half-roll in the vertical up.
Regards     Nat
> >        ----- Original Message ----- 
> >        From: Koenig, Tom 
> >        To: NSRCA Mailing List 
> >        Sent: Wednesday, March 05, 2008 7:24 PM
> >        Subject: Re: [NSRCA-discussion] YS Questions+more
> > 
> > 
> >        Hi Troy!
> > 
> >        Thanks for the info. I thought you would be toiling away on
the next developmental stage of these engines!!
> > 
> >        Hopefully soon, I can find the time to get flying again. I am
looking forward to running this little beast. I am still a little
concerned in keeping it quiet though.
> > 
> >        Four blade props? I have some of the 18.1 x 12 two bladers
but I just cant see how I'll shut the thing up with these paint
stirrers??
> > 
> >        Also-one more question to any of you out there in pattern
land.
> > 
> >        I have struggled with aileron differential for years. I am
just not happy with the rolls. I have tried various design fixes-but
about the only one that seems to work is to get the wing back to 0-0 (
which can be achieved by a few ways, design, mix or thumbs) Differential
itself does not seem to work if the wing is POA ( well...it works for
half the roll !)
> >        Another black magic fix appears to be to run parallel
ailerons-but this only 'sorta' seems to fix it. I like the feel of
equal% chord ailerons however.
> > 
> >        I am frustrated with it-I like my planes to roll as if they
had a string up its ...........well you know!
> > 
> >        OK-any 'secrets' I need to know??? Very good elevator work 
> > fixes it ( hence my 0-0 comment)
> > 
> >        Tom
> > 
> > 
> > --------------------------------------------------------------------
> > ----
> > 
> > 
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