[NSRCA-discussion] Axiom
Terry Brox
tbrox at cox.net
Tue Jan 10 06:14:56 AKST 2006
Thanks Nat. This is the kind of topic that I like to see. I enjoyed watching your voodoo fly the last time I was in Baton Rouge, but that was a couple of years ago. I still remember flying one of your old designs a few years ago, the Pussycat. I put a lot of time on that plane flying the old novice schedule. Have a great day, Terry
----- Original Message -----
From: Nat Penton
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 10:44 PM
Subject: Re: [NSRCA-discussion] Axiom
The wing must be at zero incidence in the KE to perform correctly. Since the stab is trimmed to ' raise ' the nose something has to balance the stab force. This is where the shape and/or the attitude of the fuselage comes in, to produce that force when yawed. The fuselage does have a steering effect. Nat
----- Original Message -----
From: Terry Brox
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 9:51 PM
Subject: Re: [NSRCA-discussion] Axiom
So, the wing is actually .5 pos to the stab. Very similar to most pattern models. What is the engine thrust? Do you have the vertical fin at the cg like your ealier voodoos? Would you say that your fuse shape has a "stearing" effect in knife edge that would require the wing to be set at a negative measured to the centerline of the fuse? Interesting. I have heard of some models needing negative incidence to fly right, whereas some need positive. Great topic. Terry
----- Original Message -----
From: Nat Penton
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 9:08 PM
Subject: Re: [NSRCA-discussion] Axiom
Terry,
I can see where my post was confusing. The fuselage is symmetrical. The wing and thrustline are at 0.4 deg neg to the fuse C/L and the stab is 0.9 deg neg to the C/L.
It is not readily apparent that it is flying tail low. The "incidence" of the fuse produces the pitch to gear moment, when yawed, needed to balance the lift "down" force of the stab in KE.
Nat
----- Original Message -----
From: Terry Brox
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 7:12 PM
Subject: Re: [NSRCA-discussion] Axiom
Wouldn't that mean that the wing is still positive? How does the fuse look flying by? Does it fly tail low, or is it level? At this point, what is the thrust set at? If it is set at zero in relation to the fuse centerline, wouldnt that mean it has positive thrust in relation to the wing and stab? Wouldnt you get the same effect by setting the stab at zero, and the wing at .1 positive, and the thrust at.........? What effect does your fuse shape have on the aerodynamics that creates these settings? Interesting topic, lets hear more. Thanks, Terry
----- Original Message -----
From: Nat Penton
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 5:34 PM
Subject: Re: [NSRCA-discussion] Axiom
The stab is a negative 0.5 deg to the wing
----- Original Message -----
From: Dean Pappas
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 1:58 PM
Subject: RE: [NSRCA-discussion] Axiom
Hi Nat,
I am a 4-fingered typist, and even so I manage to write a whole bunch of stuff: both toy airplane and during the day-job. It works.
So what do you figure causes the stab to see the right effective AOA?
This is only the second airplane I have heard of that flies with a negative wing vs stab incidence.
Have any of the Expresses trimmed zero-zero?
Dean
Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
Sent: Monday, January 09, 2006 2:35 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Axiom
I'm honored. I think I can get Eddie to send a picture in a day or two.
BTW another question that would be appropriate for the Quiz would be " why does the VooDoo Express, which appears symmetrical, not go to the canopy (ahem) in KE. THe answer is that it is not symmetrical. The wing is 0.4 deg negative to the fuse center line.
Some months ago you expressed the opinion that we might solve the trim mysteries if "we" got our heads together. I was hesitant to initiate a discussion via E, since I'm a one finger typist<G>. Looks like the only way, though.
Regards Nat
----- Original Message -----
From: Dean Pappas
To: NSRCA Mailing List
Sent: Monday, January 09, 2006 9:22 AM
Subject: RE: [NSRCA-discussion] Axiom
Axiom ... now there's a good name for a Pattern ship.
Hey Nat, do you have any high resolution digital pix of the latest Express? I'd like to use one in this month's (okay, March's) FM.
later,
Dean
Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
Sent: Sunday, January 08, 2006 6:04 PM
To: NSRCA Mailing List
Subject: [NSRCA-discussion] Axiom
You get the most penetration with CA when you don't want it.
Nat
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