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Twinstar MKII

 
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Mark K



Joined: 17 Aug 2014
Posts: 26
Location: Great Bend, PA

PostPosted: Sun Oct 29, 2017 1:16 pm    Post subject: Twinstar MKII Reply with quote

Good afternoon Kolbers. I have a Twinstar MKII that I am redoing and looking for some pointers on the aft cage tubing bending and fastening. I have scoured the build manual and plans and photo build manual and don't find any details on the shape to bend the tubing to. Riveting and gusseting is described but nothing on shaping. Any and all input will be greatly appreciated. Thanks in advance.

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Mark
Twinstar MKII
Great Bend, PA
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PostPosted: Mon Oct 30, 2017 6:46 am    Post subject: Twinstar MKII Reply with quote

Mark, I originally built my Twinstar MK II (TS215) back in 1989 I believe. In those day they came with 1”  diameter 6061 T6 aluminum struts . They didn’t hold up very well. Homer (Kolb)then went to providing 1 1/8” diameter aluminum struts which is the standard to this day. I think? You had to pull an aluminum sleeve out of the cage assembly to install them. They hold up very well and are very forgiving to the airframe if you happen to slam a landing. I have a set installed on my 1986 Firestar and they’ve worked fine for 28 years. They’re beginning to  sag a little now so I plan on replacing them this winter with new ones that I bought from Kolb along with the new spindles. One other thing that can cause bent landing gear struts also is a lack of positive ( toe in.)chamber at your wheel spindles. No or negative chamber (toe out) try’s to stretch the landing gear apart.  This seems to be over looked  a lot.
The best advice I can offer is to learn to land. I’m a believer in practice, practice, practice. Ex- flight instructor, sorry. Power on, wheels landings  at first until some degree of perfection is reached. Then move on to power on , crosswind wheels on landings , crab approach to cross control touchdown. Then power off gliding landings. You will be called on to perform this someday if you fly a 2 stroke engine long enough. And then to 3 point. Blowing 3 point landings are not only hard on landing gear legs but also tailwheel struts and boom tubes. Keep your airspeed up on approach and fly it to the ground slowing just at touchdown. Remember, Kolbs scrub speed off quickly, just like most ultralight types. And lastly I leave you with some words of advice from the late Homer Kolb. 
“Keep thy airspeed up, lest thee smite the ground.” 
Thanks for your genius, Homer.
Congrats on your MK II! Enjoy it and be safe out there. George H.
George Helton 
Firestar “0riginal” 1986, FS100
14GDH
Mesick, Michigan 
gdhelton(at)gmail.com (gdhelton(at)gmail.com)

On Sun, Oct 29, 2017 at 5:18 PM Mark K <seanote(at)echoes.net (seanote(at)echoes.net)> wrote:

Quote:
--> Kolb-List message posted by: "Mark K" <seanote(at)echoes.net (seanote(at)echoes.net)>

Good afternoon Kolbers. I have a Twinstar MKII that I am redoing and looking for some pointers on the aft cage tubing bending and fastening. I have scoured the build manual and plans and photo build manual and don't find any details on the shape to bend the tubing to. Riveting and gusseting is described but nothing on shaping. Any and all input will be greatly appreciated. Thanks in advance.

--------
Mark
Twinstar MKII
Great Bend, PA




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Mark K



Joined: 17 Aug 2014
Posts: 26
Location: Great Bend, PA

PostPosted: Tue Oct 31, 2017 3:50 am    Post subject: Re: Twinstar MKII Reply with quote

George, Thanks for the info but I was not asking about landing gear. I am asking about the rear cage fairing tubing and if there is any detail for input on it's shape.

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Twinstar MKII
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Richard Pike



Joined: 09 Jan 2006
Posts: 1473
Location: Blountville, Tennessee

PostPosted: Tue Oct 31, 2017 5:20 am    Post subject: Re: Twinstar MKII Reply with quote

Here are some from the one blueprint page of an original Firestar. While obviously not the same, they do show the concept, so perhaps you can improvise from here. I resized these up to the biggest possible without being overwhelming. Hope this helps.

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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Mark K



Joined: 17 Aug 2014
Posts: 26
Location: Great Bend, PA

PostPosted: Tue Oct 31, 2017 3:17 pm    Post subject: Re: Twinstar MKII Reply with quote

Richard, Thanks for the input. I'll put these images in my reference binder and they will help. Have you ever seen any documentation with a top view of the same cage fairings? Mark

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Twinstar MKII
Great Bend, PA
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Richard Pike



Joined: 09 Jan 2006
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Location: Blountville, Tennessee

PostPosted: Wed Nov 01, 2017 3:55 am    Post subject: Re: Twinstar MKII Reply with quote

The blueprints I have (which seem to be complete) don't show anything.

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

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PostPosted: Wed Nov 01, 2017 9:05 am    Post subject: Twinstar MKII Reply with quote

I got the impression that the view of the connection was from the top down.
--------------------------------------------
On Wed, 11/1/17, Richard Pike <thegreybaron(at)charter.net> wrote:

Subject: Re: Twinstar MKII
To: kolb-list(at)matronics.com
Date: Wednesday, November 1, 2017, 7:55 AM


Pike" <thegreybaron(at)charter.net>

The blueprints I have (which seem to be
complete) don't show anything.

--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is
wonderful, and Grace really is amazing.




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Mark K



Joined: 17 Aug 2014
Posts: 26
Location: Great Bend, PA

PostPosted: Wed Nov 01, 2017 9:15 am    Post subject: Re: Twinstar MKII Reply with quote

The second photo is a top view of one of the rear connections and only the rear connection. Still looking for more detail if available. Hoping for more. The other photos are side views with the engine mount at the top.

thanks


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Twinstar MKII
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