[NSRCA-discussion] Flying stab travel

[Matt Griffitt]

A flying stab is more effected than a elevator.  Travel will be 60, or
70%.of a elevators travel.
I have been flying a flying stab for the last 8 years . On all of BJ
Craft's planes the total amount of travel is 2.25 inches at the frount stab
tube.
I hope this helps.



Matt Griffitt
ADGaero.com
334.380.8228

On Thu, Sep 26, 2019, 12:11 PM Richard B. Strickland via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:

> I agree on a pattern airplane (I have two BiSides with flying
> stabs—anybody want one?) as you have the advantage of forced airflow over
> the stab, but on an F4 twin 70 EDF, I run out of elevator on low rate at
> around 20 with flaps and slats on landing.  Maybe run 10-13 on low, but
> have some significant reserve on high, like 25+ and maybe 14-22 mid range
> for maneuvering speeds. Sounds like a fun project!
>
>
>
> Richard Strickland
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
> ------------------------------
> *From:* NSRCA-discussion <nsrca-discussion-bounces at lists.nsrca.org> on
> behalf of John Decker via NSRCA-discussion <
> nsrca-discussion at lists.nsrca.org>
> *Sent:* Thursday, September 26, 2019 11:49:19 AM
> *To:* General pattern discussion <nsrca-discussion at lists.nsrca.org>;
> Scott McHarg <scmcharg at gmail.com>
> *Subject:* Re: [NSRCA-discussion] Flying stab travel
>
> Scott,
>
> Normally, I set elevators at 10 degrees to 12 degrees for maiden. When I
> had a Nuance with a full flying stab it was so responsive I had it dialed
> down to 8 degrees by the time I had it trimmed out. And I found the radii
> could get sharp pretty fast so I had about 20% more expo programmed as
> well. Definitely more surface area makes a big difference. The nice thing
> is that once initial incidence is set, you adjust using elevator trim
> rather than incidence adjusters.
>
> Hope that helps,
>
> John
>
> On Thursday, September 26, 2019, 11:29:40 AM CDT, Scott McHarg via
> NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
>
>
> Howdy,
>
> I'm looking for a little advice on a full flying stab.  I'm teaching an
> Aerospace Senior Capstone Design class at Texas A&M and one of my students'
> teams is scratch building a plane based on a supersonic business jet in
> sub-scale utilizing an EDF.  That part isn't really part of the equation
> but wanted you to understand what they're doing.
>
> The team has figured out the design and mechanical connections which I
> have approved but we are needing an idea of how much travel the stab
> needs.  I understand that there are many variables including size of the
> stab, CG, AC, etc. but I'm looking to give them a place to start.  I was
> thinking of the Bi-Side and wondering if someone could give me, in degrees,
> the amount of travel for the stab so that we have a starting point.  I'm
> sure I'll have fun with the maiden but, hopefully, we will be in the
> ballpark.
>
> Thanks!
> Scott
>
> *Scott A. McHarg*
>
> Takeoff is optional.  Landing is mandatory!
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