Incidence or CG?

[Jim Ivey]

Tom
 The way I understand is to put 1/4 degree pos incidence,(wing AOA)so that the plane has a tendancy to stabilize upright then, balance so that inverted, the down elev input is minimal depending on your preferences as Troy likes his a little nose heavy. in this case. At this point you are ready to continue the trimming process.
my 2C

Jim Ivey
> 
> From: "Thomas P. Fiorentino" <super7 at adelphia.net>
> Date: 2005/09/11 Sun PM 09:56:34 EDT
> To: <discussion at nsrca.org>
> Subject: Re: Incidence or CG?
> 
> Symetrical airfoil wing design needs some AOA to create lift though...no?
> 
> I'll buy a dozen of those perfect planes if they are out there!
>   ----- Original Message ----- 
>   From: Ken Thompson 
>   To: discussion at nsrca.org 
>   Sent: Sunday, September 11, 2005 3:35 PM
>   Subject: Re: Incidence or CG?
> 
> 
>   You shouldn't need an aft CG to create lift, the wing design will do that for you.  If your "assumption plane" flies level, both upright and inverted, with no elevator input, I call that the "perfect" CG.
> 
>   At least that is my opinion.
> 
>   Ken
>     ----- Original Message ----- 
>     From: Thomas P. Fiorentino 
>     To: discussion at nsrca.org 
>     Sent: Sunday, September 11, 2005 8:51 PM
>     Subject: Re: Incidence or CG?
> 
> 
>     OK thats helpful Ken.  I have a pattern ARF that I am tinkering with and having some fun.  The downlines are really nice, but I hold too much down on inverted flight.  I'll move the CG aft a little and see where that takes me.
> 
>     Here is my follow-up question because I can't help myself.  Lets assume you have a plane with wing and stab at 0 degrees.  Lets assume further that you have no elevator trim and the engine has no thrust adjustments.  If this assumption airplane actually flew level...would an aft CG be responsible for creating the right AOA on the wing to create lift?  Am I understanding this correctly?
> 
>     Thanks for your input!
> 
>     Tom
>       ----- Original Message ----- 
>       From: Ken Thompson 
>       To: discussion at nsrca.org 
>       Sent: Sunday, September 11, 2005 6:38 AM
>       Subject: Re: Incidence or CG?
> 
> 
>       If you had a little positive incidence in the main wing, to fly level in upright flight, you would have it corrected by incidence in the stab or possibly elevator trim.  When you roll inverted the correction remains constant.
> 
>       Ken
>         ----- Original Message ----- 
>         From: Thomas P. Fiorentino 
>         To: discussion at nsrca.org 
>         Sent: Sunday, September 11, 2005 12:29 PM
>         Subject: Incidence or CG?
> 
> 
>         Bear with me on this question guys...
> 
>         I know the test for CG is to roll inverted and watch for nose down or tail down.  But relative to everything else why wouldn't wing incidence screw you up inverted?  Seems to me that all things remaining equal, if you had a little positive wing incidence and level flight upright that the nose would drop when inverted....Where is the blind spot in my logic?
> 
>         Tom Fiorentino
> 

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