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nickc(at)mtaonline.net
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 Posted: Wed Feb 03, 2010 10:00 pm Post subject: Pre-construction advise wanted |
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Kolbsters,
I am just about to start piecing together my wings, and then tail. Over time I have picked up a few hint about possible improves to avoid weak areas of design, or maybe I should say weak materials. I have read enough to know these are great plane, but does anyone have a list of thing they would change or materials they would upgrade if they were doing it all over again…?
Thanks as always,
Nick Cassara
Palmer, Alaska
Proto type Kolbra is going to have wings again!
[quote][b]
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Thu Feb 04, 2010 5:43 am Post subject: Re: Pre-construction advise wanted |
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| nickc(at)mtaonline.net wrote: | Kolbsters,
I am just about to start piecing together my wings, and then tail. Over time I have picked up a few hint about possible improves to avoid weak areas of design, or maybe I should say weak materials. I have read enough to know these are great plane, but does anyone have a list of thing they would change or materials they would upgrade if they were doing it all over again…?
Thanks as always,
Nick Cassara
Palmer, Alaska
Proto type Kolbra is going to have wings again!
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As I recall, the only thing I wanted to change on my FS II was the pullies under the seat that carry the control cables to the tail. I found the pully diameter to be borderline too small which led to a tight angle for the cables where they ran over the pullies. There were broken strands on the cables where they ran over the pullies after about 15 or 20 hours as a result (the original cables were scary, about 1/3 of the strands broken when I finally discovered the problem). I made several sets of cables as a result, tho the last set using cable I ordered from Travis at Kolb held up fine until I sold the plane.
If I do another FSII, I'd look at modifying this pully block to use larger pullies. The design is ok according to AC 43.13 because of the angles involved, but it's borderline on one of the elevator cables that goes to the (upper horn) on the stick. I'd go with larger pulies to add more fudge-factor here.
I literally couldn't find anything else on the plane that struck me as goofy or needing modification etc. The original builder did go with a nice swivelling tailwheel instead of the stock Kolb one, and I've heard about the weakness of the lower vertical stab piece, which some guys mod to strengthen it.
I love the construction of the Kolb, it's all aircraft grade stuff with no weird problems, etc. That's why it's near the top of the list of planes I'm considering building when/if I ever get to that spot in my flying career....
LS
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LS
Titan II SS |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Thu Feb 04, 2010 5:44 am Post subject: Pre-construction advise wanted |
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Nick, corrosion protection, corrosion protection, corrosion protection. Alodyne, epoxy, drain grommets at the trailing edge, and inspection ports so you can see that it's all working. I can send pictures of what happens if you don't do these things and it ain't pretty.
Rick Girard
On Wed, Feb 3, 2010 at 11:59 PM, Nick Cassara <nickc(at)mtaonline.net (nickc(at)mtaonline.net)> wrote:
[quote]
Kolbsters,
I am just about to start piecing together my wings, and then tail. Over time I have picked up a few hint about possible improves to avoid weak areas of design, or maybe I should say weak materials. I have read enough to know these are great plane, but does anyone have a list of thing they would change or materials they would upgrade if they were doing it all over again…?
Thanks as always,
Nick Cassara
Palmer, Alaska
Proto type Kolbra is going to have wings again!
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