REFLECTOR: Thrustline change

[steve korney]

Richard...

I have a question...

In general...........Does it take more energy to keep the nose of a canard aircraft down with elevator trim, or to keep the nose of a conventional aircraft down with elevator trim...? 


Steve 

> From: richard at naples-air-center.com
> Date: Fri, 29 Mar 2013 16:29:04 -0400
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Thrustline change
> 
> David,
> 
> Think of it as reflexing your Canard. That is very efficient since you are removing lift and drag from the control surface. 
> 
> Richard
> 
> Sent from my iPhone 5
> 
> On Mar 29, 2013, at 1:29 PM, "David Ullman" <ullman at robustdecisions.com> wrote:
> 
> > When I cruise with only me in the SEFG I have to put in 1/2 inch of down
> > trim (elevator up) or more.  This is clearly inefficient.  I already have
> > 18lb of lead in the nose and don't want to add more.  A friend suggested
> > shimming the top of the engine mount for a little downward pitch moment.  I
> > sort of like the idea but am worried that it might increase my take off
> > distance as it will drive the canard downward a little.  He thinks it may
> > help as the engine thrust line is slight more upward.  
> > 
> > Any thoughts or experiences?
> > 
> > 
> > David Ullman
> > N444DX
> > President EAA 292
> > 541-760-2338
> > david at davidullman.com
> > 
> > 
> > 
> > 
> > 
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