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Thanks to all for you input

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nickc(at)mtaonline.net
Guest

Posted: Sun Jan 04, 2009 9:24 pm Post subject: Thanks to all for you input

Thanks you all for your input on the extension of my wing spars! For those unfamiliar with my project. I bought the Kolbra prototype fuselage, and plan to build a duplication of the “new Kolb wing”. The production Kolbra has the highest listed stall speed of the fleet. Built as a dual control trainer, also does not have flaps. My hope is to build a wing, with flaps, that will have a lower stall speed.   

   

Thanks, Nick  

   

Do not archive   

       [quote][b]

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Mon Jan 05, 2009 4:25 pm Post subject: Re: Thanks to all for you input

If you want to lower stall speed and improve low speed handling, the easiest way to do it is by adding VG's along the entire span of the wing, if you have not seen my VG demonstration video, you can watch it here.



http://www.youtube.com/watch?v=EjI7-kBptrA



Your idea of extending the wing is also a very good one for lowering stall speed and improving low speed handling.  In the Titan Tornado SS, extending the wingspan 4 feet actually INCREASED the airplanes cruise speed as the wing flew at less angle of attack with the longer wing than it did with the shorter wing, creating less induced drag.  Increasing the wingspan by 4 feet also worked well to improve the slow speed handling of the Tornado SS.   Properly designed wingtips will also decrease stall speed.    If it were me, I would do all of these things.   I have been considering adding two feet to each wing of my MK III Xtra and using the new Kolb wingtips,  I am just not ready to stop flying my Kolb for the amount of time it would take me to do this work...



As far as where to lengthen the spar, you most definitely do not want to do it on the inboard section of the wing, the forces at the inboard section are many times greater than at the wingtip, resulting in a much higher chance of catastrophic and sudden wing failure if you do not do a perfect splice.



Good Luck,



Mike

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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

jstewart(at)inebraska.com
Guest

Posted: Mon Jan 05, 2009 4:52 pm Post subject: Thanks to all for you input

Hi neighbor.  :>)



	You're right in that the extra drag of the wingspan was negated by

the smaller angle of attack.  I wouldn't say it increased the cruise speed,

but we didn't really lose anything either.  And yes, stall speed went way

down.  

	One thing to keep in mind is that by increasing the wingspan, you're

going to decrease the roll rate.  The SS is considerably slower in roll than

the regular wing.  That didn't mean I couldn't roll it, but it's just

fighter-fast like the others.



Co-designer of the SS,



J.D. Stewart

UltraFun AirSports, LLC

www.ultrafunairsports.com

Titan Aircraft E-mail list

http://groups.yahoo.com/group/Titanaircraft/

Challenger E-mail list 

http://challenger.inebraska.com



 

 	  Quote: 	
		   

 

 If you want to lower stall speed and improve low speed 

 handling, the easiest way to do it is by adding VG's along 

 the entire span of the wing, if you have not seen my VG 

 demonstration video, you can watch it here.

 

 http://www.youtube.com/watch?v=EjI7-kBptrA

 

 Your idea of extending the wing is also a very good one for 

 lowering stall speed and improving low speed handling.  In 

 the Titan Tornado SS, extending the wingspan 4 feet actually 

 INCREASED the airplanes cruise speed as the wing flew at less 

 angle of attack with the longer wing than it did with the 

 shorter wing, creating less induced drag.  Increasing the 

 wingspan by 4 feet also worked well to improve the slow speed 

 handling of the Tornado SS.   Properly designed wingtips will 

 also decrease stall speed.    If it were me, I would do all 

 of these things.   I have been considering adding two feet to 

 each wing of my MK III Xtra and using the new Kolb wingtips,  

 I am just not ready to stop flying my Kolb for the amount of 

 time it would take me to do this work...

 

 As far as where to lengthen the spar, you most definitely do 

 not want to do it on the inboard section of the wing, the 

 forces at the inboard section are many times greater than at 

 the wingtip, resulting in a much higher chance of 

 catastrophic and sudden wing failure if you do not do a 

 perfect splice.

 

 Good Luck,

 

 Mike

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