Matronics Email Lists :: View topic - Twinstar Mk3 Wing Incidence Question

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Twinstar Mk3 Wing Incidence Question

Matronics Email Lists Forum Index -> Kolb-List

View previous topic :: View next topic

Author Message

Steve Sands

Joined: 08 Jul 2020
Posts: 1

Posted: Wed Jul 08, 2020 11:46 am Post subject: Twinstar Mk3 Wing Incidence Question

I am working on an older Mk3 that has never flown.  We are part of an EAA group in Oregon.  We are trying to correctly set up the wing incidence as the plans we have are not clear. 

1. Do we set the wing incidence 9 degrees and 7 1/2 inches from horizontal at leading edge when the boom tube is level or do we set the horizontal stab as level then set the wing incidence?



2. We have a 80 Hp Rotax 912 UL mounted.  Does the thrust line need to be parallel with the boom tube or parallel with the horizontal stab line?



Thank you all for any guidance you can share.



Steve

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kolb-List

_________________
Steve Sands
EAA-292

rascaljohn

Joined: 02 May 2013
Posts: 23

Posted: Wed Jul 08, 2020 5:48 pm Post subject: Twinstar Mk3 Wing Incidence Question

I have a firestar 2. In order to correctly calculate the weight and balance for my plane- step 1 is to cause the wing to be at 9 degrees (7 1/2”) by raising the tail. Simulate the scale’s thickness with a similar block under all wheels if you only have one scale... the plane must remain at the 9 degree wing angle throughout the weighing. The block is removed when each individual wheel is weighed. 

My plane required that I was in the pilots seat to put the CG within the allowable range. After talking with Brian at Kolb I suggested that maybe I could move the engine forward 1”. He said that I should then install a 1” spacer to move the prop backwards to it’s original clearance from the wing. 

John Fitt 



 	  Quote: 	
		   On Jul 8, 2020, at 12:46 PM, Steve Sands <ssands10(at)gmail.com> wrote:

 

 

 

 I am working on an older Mk3 that has never flown.  We are part of an EAA group in Oregon.  We are trying to correctly set up the wing incidence as the plans we have are not clear. 

 1. Do we set the wing incidence 9 degrees and 7 1/2 inches from horizontal at leading edge when the boom tube is level or do we set the horizontal stab as level then set the wing incidence?

 

 2. We have a 80 Hp Rotax 912 UL mounted.  Does the thrust line need to be parallel with the boom tube or parallel with the horizontal stab line?

 

 Thank you all for any guidance you can share.

 

 Steve

 

 --------

 Steve Sands

 EAA-292

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=497209#497209

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kolb-List

gdhelton(at)gmail.com
Guest

Posted: Thu Jul 09, 2020 2:12 am Post subject: Twinstar Mk3 Wing Incidence Question

Yes. That sounds about right. Especially if you’re running a Ivoprop, because of the blade flex. 

Sent from my iPhone

 	  Quote: 	
		   On Jul 8, 2020, at 9:51 PM, John Fitt <jpfitt(at)sbcglobal.net> wrote:

 I have a firestar 2. In order to correctly calculate the weight and balance for my plane- step 1 is to cause the wing to be at 9 degrees (7 1/2”) by raising the tail. Simulate the scale’s thickness with a similar block under all wheels if you only have one scale... the plane must remain at the 9 degree wing angle throughout the weighing. The block is removed when each individual wheel is weighed. 

 My plane required that I was in the pilots seat to put the CG within the allowable range. After talking with Brian at Kolb I suggested that maybe I could move the engine forward 1”. He said that I should then install a 1” spacer to move the prop backwards to it’s original clearance from the wing. 

 John Fitt 

> On Jul 8, 2020, at 12:46 PM, Steve Sands <ssands10(at)gmail.com> wrote:

> 

> 

> 

> I am working on an older Mk3 that has never flown.  We are part of an EAA group in Oregon.  We are trying to correctly set up the wing incidence as the plans we have are not clear. 

> 1. Do we set the wing incidence 9 degrees and 7 1/2 inches from horizontal at leading edge when the boom tube is level or do we set the horizontal stab as level then set the wing incidence?

> 

> 2. We have a 80 Hp Rotax 912 UL mounted.  Does the thrust line need to be parallel with the boom tube or parallel with the horizontal stab line?

> 

> Thank you all for any guidance you can share.

> 

> Steve

> 

> --------

> Steve Sands

> EAA-292

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=497209#497209

> 

> 

> 

> 

> 

> 

> 

> 

>

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kolb-List

neilsenrm(at)gmail.com
Guest

Posted: Thu Jul 09, 2020 5:44 am Post subject: Twinstar Mk3 Wing Incidence Question

Steve

I gave the issue of engine thrust line a bunch of thought when I built my engine mount for my VW powered MKIIIC. It all depends on wing incidence. You don't want the engine thrust pushing you down and the wing is more efficient at producing lift than engine thrust so set the engine to point straight back in flight. Also not right or left. So the answer is no don't set the engine thrust even with the fuselage boom or the horizontal stabilizer. Set the engine thrust even with the bottom of the wing plus a few degrees for the wing to produce lift.

Watching Kolbs fly I see some flying close to boom tube level but most flying tail high. We had one on the list that must have built his MKIII to fly way tail high so the fuselage tube is a poor reference. The horizontal stabilizer frequently gets adjusted after a few flights for pitch stability. Remember the horizontal stabilizer's function is to push the tail down and then stabilize pitch.

As usual, worth what you paid.

Rick Neilsen

Redrive VW Powered MKIIIC   

On Wed, Jul 8, 2020 at 3:49 PM Steve Sands <ssands10(at)gmail.com (ssands10(at)gmail.com)> wrote:



 	  Quote: 	
		  --> Kolb-List message posted by: "Steve Sands" <ssands10(at)gmail.com (ssands10(at)gmail.com)>

 

 I am working on an older Mk3 that has never flown.  We are part of an EAA group in Oregon.  We are trying to correctly set up the wing incidence as the plans we have are not clear. 

 1. Do we set the wing incidence 9 degrees and 7 1/2 inches from horizontal at leading edge when the boom tube is level or do we set the horizontal stab as level then set the wing incidence?

 

 2. We have a 80 Hp Rotax 912 UL mounted.  Does the thrust line need to be parallel with the boom tube or parallel with the horizontal stab line?

 

 Thank you all for any guidance you can share.

 

 Steve

 

 --------

 Steve Sands

 EAA-292

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=497209#497209

 

 

 

 

 

 

 ===========

 -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Kolb-List

 ===========

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ===========

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kolb-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Kolb-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum