[NSRCA-discussion] Flying stab travel

[Scott McHarg]

Thank you all for responding.  Matt or Richard, can y'all give me maybe an
"ish" idea of the chord at the root of the stab and a span or, even better,
sq. in. of the stabs?  The numbers so far seem to be what I was expecting.
I was planning on having them set 3 rates.  Maybe one at 20 deg., one at 15
deg. and one at 10 deg.  I was wondering if it'd be about the same as the
throw on an elevator.  Thanks again!

Scott

*Scott A. McHarg*

Takeoff is optional.  Landing is mandatory!


On Thu, Sep 26, 2019 at 12:32 PM Matt Griffitt via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:

> 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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