[NSRCA-discussion] YS Questions+more - Rolls

[Wayne Galligan]

your upside down..............


----- Original Message ----- 
From: <shinden1 at cox.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, March 06, 2008 4:14 PM
Subject: Re: [NSRCA-discussion] YS Questions+more - Rolls


> what happens when you fly inverted?
> 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
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> >
>> >        _______________________________________________
>> >        NSRCA-discussion mailing list
>> >        NSRCA-discussion at lists.nsrca.org
>> >        http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>> >
>> >
>> > ------------------------------------------------------------------------------
>> >
>> >
>> >  _______________________________________________
>> >  NSRCA-discussion mailing list
>> >  NSRCA-discussion at lists.nsrca.org
>> >  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>> > _______________________________________________
>> > NSRCA-discussion mailing list
>> > NSRCA-discussion at lists.nsrca.org
>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>> >
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion