[NSRCA-discussion] Flying stab travel

[Richard B. Strickland]

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

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________________________________
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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