<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">The most important thing about a flying stab is the balance point. Always...always balance nose (leading edge) heavy. This is critical. Otherwise it will “fly back” and nose down with no control. Deflection is more than a normal elevator. Remember that you need down force to balance lift. I scratch built a ducted fan F15 and had good success. I can’t tell you the amount of deflection. Unfortunately it’s trial and error. Start with large and dual rate it. Keep it slow for the first few flights. Experiment with faster speeds. Good luck! ...Charlie<br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPad</div><div dir="ltr"><br>On Sep 26, 2019, at 10:46 AM, Matt Griffitt via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="auto">The actual throw should be these numbers, <div dir="auto">High. 15 to 17 deg</div><div dir="auto">Med. 8 to 14 deg</div><div dir="auto">Low. 5 to 8 deg.</div><div dir="auto"><br></div><div dir="auto">You have to remeber that is way more effective than a elevator. </div><div dir="auto"><br></div><div dir="auto">The size of the stab is the same as a elevator and the cord also. <br><br><div data-smartmail="gmail_signature" dir="auto">Matt Griffitt <br><a href="http://ADGaero.com">ADGaero.com</a><br>334.380.8228</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 26, 2019, 12:37 PM Scott McHarg via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif;color:rgb(153,153,230)">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!</div><div class="gmail_default" style="font-family:georgia,serif;color:rgb(153,153,230)"><br></div><div class="gmail_default" style="font-family:georgia,serif;color:rgb(153,153,230)">Scott</div><div class="gmail_default" style="font-family:georgia,serif;color:rgb(153,153,230)"><br></div><div><div dir="ltr" class="m_3229909184682106818gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b style="color:rgb(153,153,230)"><font style="font-family:comic sans ms,sans-serif" size="4">Scott A. McHarg</font></b></div><div dir="ltr"><br></div><div dir="ltr"><div>Takeoff is optional. Landing is mandatory!</div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 26, 2019 at 12:32 PM Matt Griffitt via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" rel="noreferrer">nsrca-discussion@lists.nsrca.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">A flying stab is more effected than a elevator. Travel will be 60, or 70%.of a elevators travel. <div dir="auto">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. </div><div dir="auto">I hope this helps.<br><div dir="auto"><div dir="auto"><br></div><div dir="auto"><br><br><div dir="auto">Matt Griffitt <br><a href="http://ADGaero.com">ADGaero.com</a><br>334.380.8228</div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 26, 2019, 12:11 PM Richard B. Strickland via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" rel="noreferrer">nsrca-discussion@lists.nsrca.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">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!</p>
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<div id="m_3229909184682106818gmail-m_-4912059987787141514m_2885262860516693405divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> NSRCA-discussion <<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" rel="noreferrer noreferrer" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>> on behalf of John Decker via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" rel="noreferrer noreferrer" target="_blank">nsrca-discussion@lists.nsrca.org</a>><br>
<b>Sent:</b> Thursday, September 26, 2019 11:49:19 AM<br>
<b>To:</b> General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" rel="noreferrer noreferrer" target="_blank">nsrca-discussion@lists.nsrca.org</a>>; Scott McHarg <<a href="mailto:scmcharg@gmail.com" rel="noreferrer noreferrer" target="_blank">scmcharg@gmail.com</a>><br>
<b>Subject:</b> Re: [NSRCA-discussion] Flying stab travel</font>
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<div dir="ltr">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.</div>
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<div dir="ltr">Hope that helps,</div>
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<div>On Thursday, September 26, 2019, 11:29:40 AM CDT, Scott McHarg via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" rel="noreferrer noreferrer" target="_blank">nsrca-discussion@lists.nsrca.org</a>> wrote:
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Howdy,</div>
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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.</div>
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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.</div>
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Thanks!</div>
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Scott</div>
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<div dir="ltr"><b style="color:rgb(153,153,230)"><font style="font-family:"comic sans ms",sans-serif" size="4">Scott A. McHarg</font></b></div>
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<div>Takeoff is optional. Landing is mandatory!</div>
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