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Two settings for wing Angle of Incidence.

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gotime242

Joined: 09 Jul 2010
Posts: 52
Location: West Palm Beach, FL

Posted: Sun Aug 08, 2010 9:54 am Post subject: Two settings for wing Angle of Incidence.

Hello all, 



I'm pretty new to the kolb. I have a firestar II that i have flown twice so far. 



It has two holes for the main wing spar, i have been flyng on the lower one, so it has a higher angle of incidence. 



How would the airplane handle with the lower angle of incidence setting? I understand the aerodynamics of it, but i would like to hear from kolb specific flyers. 



So far i am still getting use to having to come in and land this thing with no flare and its interesting way of losing elevator authority at slow speeds while trying to land. (For now im just landing with a little power).



With the other setting (lower angle of incidence)....how does it land? How does it cruise? Stall characteristics? 



Thanks!!

donaho1(at)verizon.net
Guest

Posted: Sun Aug 08, 2010 12:41 pm Post subject: Two settings for wing Angle of Incidence.

It has two holes for the main wing spar,

If I remember correctly, the plans only call for one hole in the 

middle of the tab. If your`s has two holes they either changed the 

plans or it was a builder modification. I don`t know how changing to 

the other hole will change the way it flies. Also my guess is, not 

many of the FSII`s have two holes. I could be wrong, so this 

information is worth what you paid for it. Lanny FSII  N598LF

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Aug 08, 2010 2:12 pm Post subject: Two settings for wing Angle of Incidence.

This is one that needs to be talked over with Travis and the guys at the factory, IMHO.Assuming you would get a similar effect that the Mark IIIX gets, lowering the angle of incidence will raise the nose of the fuselage. The wing has to fly at a given angle to produce lift based on airspeed so the only thing that can change is the angle of the fuselage.

 



Rick Girard



On Sun, Aug 8, 2010 at 3:40 PM, Lanny Fetterman <donaho1(at)verizon.net (donaho1(at)verizon.net)> wrote:

[quote] --> Kolb-List message posted by: Lanny Fetterman <donaho1(at)verizon.net (donaho1(at)verizon.net)>

 

 It has two holes for the main wing spar,

 If I remember correctly, the plans only call for one hole in the middle of the tab. If your`s has two holes they either changed the plans or it was a builder modification. I don`t know how changing to the other hole will change the way it flies. Also my guess is, not many of the FSII`s have two holes. I could be wrong, so this information is worth what you paid for it. Lanny FSII  N598LF

  

 

 

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Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Sun Aug 08, 2010 5:18 pm Post subject: Re: Two settings for wing Angle of Incidence.

The lower wing incidence will make the tailwheel hit the runway even sooner when landing making a flare even more impossible.

gotime242

Joined: 09 Jul 2010
Posts: 52
Location: West Palm Beach, FL

Posted: Sun Aug 08, 2010 5:31 pm Post subject: Re: Two settings for wing Angle of Incidence.

Hmm...kind of worries me now. The kit was built in 1996/97 if that makes any difference (if it was diff then). 



I really hope it wasnt just a modification 



Eugene does your kolb have these two holes?



Does anyone else have two holes? Ill have to check the plans tomorrow...

Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Sun Aug 08, 2010 6:21 pm Post subject: Re: Two settings for wing Angle of Incidence.

I believe any hole that is there was put there by the builder or a subsequent owner modifier.



I may be wrong but It is my opinion that  Kolb did not drill any wing attach holes for  the wing spar attach points. At least that was the case on all the kolb planes I built.

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Aug 08, 2010 6:41 pm Post subject: Two settings for wing Angle of Incidence.

 	  Quote: 	
		   



 The lower wing incidence will make the tailwheel hit the runway even 

 sooner when landing making a flare even more impossible.


	




Gene/Folks:



One of the first things I noticed first time I flew  Sling Shot was the 

exagerated tail low attitude of the SS at slow speeds caused by much less 

wing incidence than I was familiar with in the other model Kolbs.



Pull on the flaperons and it leveled up pretty good.



john h

mkIII - Learning to walk before I can fly again.

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Aug 08, 2010 6:47 pm Post subject: Two settings for wing Angle of Incidence.

 	  Quote: 	
		   



 Hmm...kind of worries me now. The kit was built in 1996/97 if that makes 

 any difference (if it was diff then).



 I really hope it wasnt just a modification 



 Eugene does your kolb have these two holes?



 Does anyone else have two holes? Ill have to check the plans tomorrow...


	


gotime242/Folks:



Sounds like your builder made a mistake when he originally rigged the wings, 

then went back and corrected it, or....he was experimenting with less wing 

incidence to see the difference in flight characteristics and performance.



Just a big ole guess.



john h

mkIII

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

gotime242

Joined: 09 Jul 2010
Posts: 52
Location: West Palm Beach, FL

Posted: Sun Aug 08, 2010 6:58 pm Post subject: Re: Two settings for wing Angle of Incidence.

Crap. Wish i never asked now, because thats a little unsettling. Oh well....it still flies well.



Here is a pic:

DSCF0145.JPG

Description:

Wing spar, two holes.

Filesize:

36.7 KB

Viewed:

6675 Time(s)

williamtsullivan(at)att.n
Guest

Posted: Sun Aug 08, 2010 8:30 pm Post subject: Two settings for wing Angle of Incidence.

One of my sets of wings for the Firestar had three holes to set incidence.  I asked about it, and somebody said to use the center hole, but the others could be used without any problem.  Just a matter of fine tuning, I guess.

  

                                    Bill Sullivan

                                    Windsor Locks, Ct.

                                    FS 447

 [quote][b]

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Aug 08, 2010 9:55 pm Post subject: Two settings for wing Angle of Incidence.

I'd say the original builder screwed up when he drilled the upper hole and corrected it. Both my Mk III and my Firestar are drilled in approximately the same as the lower hole. It's your experiment, but I'd leave it where you have it if it was me. As Beauford says, "Worth what ye paid for it". 



Rick Girard



On Sun, Aug 8, 2010 at 9:58 PM, gotime242 <dylanshine(at)gmail.com (dylanshine(at)gmail.com)> wrote:

[quote] --> Kolb-List message posted by: "gotime242" <dylanshine(at)gmail.com (dylanshine(at)gmail.com)>

 

 Crap. Wish i never asked now, because thats a little unsettling. Oh well....it still flies well.

 

 Here is a pic:

 

 

 

 

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Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Mon Aug 09, 2010 5:22 pm Post subject: Two settings for wing Angle of Incidence.

242,



In the picture, the hole that has  the pin looks to me like it is in  

the normal plans built  position.

I'd guess someone tried to improve on Homer, and discovered Homer knew  

what he was doing.

Gene,

On Aug 8, 2010, at 10:58 PM, gotime242 wrote:



 	  Quote: 	
		   Crap. Wish i never asked now, because thats a little unsettling. Oh  

 well....it still flies well.



 Here is a pic:

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