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Twinstar Mk3 Wing Incidence Question

 
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Steve Sands



Joined: 08 Jul 2020
Posts: 1

PostPosted: Wed Jul 08, 2020 11:46 am    Post subject: Twinstar Mk3 Wing Incidence Question Reply with quote

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


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rascaljohn



Joined: 02 May 2013
Posts: 23

PostPosted: Wed Jul 08, 2020 5:48 pm    Post subject: Twinstar Mk3 Wing Incidence Question Reply with quote

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











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gdhelton(at)gmail.com
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PostPosted: Thu Jul 09, 2020 2:12 am    Post subject: Twinstar Mk3 Wing Incidence Question Reply with quote

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
>
>
>
>
>
>
>
>
>







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neilsenrm(at)gmail.com
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PostPosted: Thu Jul 09, 2020 5:44 am    Post subject: Twinstar Mk3 Wing Incidence Question Reply with quote

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






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