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How to increase lift on horizontal stab?
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propellerdesign(at)tele2.
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Posted: Sun Jan 13, 2008 2:42 am Post subject: How to increase lift on horizontal stab?

Ok Larry



Now even I understand what you mean, you wasn't that much off.



The Tail is there for stability and control, it doesn't do anything for 

lift. but you can improve it so you gab get most out of the wing.



As I said flaps increase lift, without having to increase angle of the 

aircraft, it really work the opposite, wing will stall at a lower angle 

relative the basic airfoil, with flap.

But the effective AOA is increased when flap is deployed, if you draw a line 

from trailing edge of flap to the nose of airfoil you see what I mean.



Increasing the span of the horiz. plane is a good way to increase 

effectiveness. an airfoil isn't bad either, maybe with some camber 1% or so 

(upside down) and making the elevator 10% thicker then  the basic airfoil at 

the hingeline.



I would keep the washout in wings, better safe then sorrow.



Jan



Ps. just make sure you have power to overcome the extra drag from effective 

flaps...

---

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Sun Jan 13, 2008 3:33 am Post subject: Re: How to increase lift on horizontal stab?

Larry , What model  AVid do you have anyhow ? 



The flaps on AVID HH i have flown  are restricted and I never found them to be as usefull as mine on the Kitfox IV -  I do get over 30 degree down and they are a really attribute to getting off quicker.  Avids i think might see 15 degrees if  that.

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LarryM

Joined: 27 Nov 2007
Posts: 63
Location: Genoa, IL

Posted: Mon Jan 14, 2008 8:10 am Post subject: Re: How to increase lift on horizontal stab?

I have a mk1V stol wing.  They are restricted, but Dean suggested to go ahead and adjust them just above the point of reversal.  You can always retract them if it does reverse.   - just waiting for the weather to co operate.



  Ref: washout - they must have changed the wing since Dean sold it, as the wing is too stiff to adjust.  Looking at the manual - they glued everything impermanently to keep the washout in - so I guess that stays.



  Hopefully, I'll get the gear extended 6" this week, then test fly.  I'd rather not have to do the airfoiled tail.  Remember it's a quest - not a necessity.



larry

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Jan 14, 2008 6:31 pm Post subject: How to increase lift on horizontal stab?

Larry:  

   

Are you putting pipe into the gear legs or bigger tires??  Bigger tires could open up lots more fun!  

   

Noel  

   

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Mon Jan 14, 2008 7:09 pm Post subject: Re: How to increase lift on horizontal stab?

Same thing I been asking about , 

making a new gear 6 to 10 inches taller.



hopefully it would get me off quicker with greater AOA ?  

Tail seem to be restricting me now?  http://www.youtube.com/watch?v=itqyBYxU0lU

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