KR> First Flight Issues - Elevator Trim Tab

[Sid Wood]

On the first flight the elevator trim tab Nyrod sheath anchor point broke 
loose and moved the trim tab to the full nose up position resulting in near 
loss of control.  Epoxy does not stick to well to plastic surfaces.
For the fix: I installed an aluminum angle to support an Adel cushion clamp. 
The clamp captures a 1/4 inch fuel hose that was slipped over the Nyrod 
sheath.  Wrapped the Nyrod with vinyl tape for a snug fit in the hose.  The 
clamp keeps the cable from wiggling around and prevents the sheath from 
moving without pinching the inner cable.  Operation of the trim tab is now 
smooth and positive.
Here is a picture from my website for the re-worked cable support:
http://websites.expercraft.com/sidwood/index.php?q=log_entry_id=71589

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA

KR> Glass cloth shelf life

[smwood]

The glass in fiberglass cloth does not have a shelf life.  The glass is 
inorganic.  The sizing coating on the glass strands is an organic compound 
and has a definite shelf life.
I use to teach this fiber glass stuff for the EAA Sport Air Workshops and 
still do at AirVenture.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA

---
> Sid said  - Fiber glass cloth has a sizing coating on each strand to help
> the epoxy
> resin to bond to the glass. The shelf life for most fiber glass sizing is
> five years. After that time the wetting out with the resin becomes more
> difficult and will result in a weaker structure. The older the cloth the
> worse the situation will be.
>
> I posted this question to the group some time ago and was told that there 
> is
> no end shelf life on fiber glass cloth. Would someone in the industry, (If
> there is someone in the group), please check in and clear this up.
>
> Patrick Driscoll
> Saint Paul, MN
> patrick36 at usfamily.net
> www.pensbypat.com
> If you can read this, Thank a teacher
> If you are reading this in English, thank a veteran
>
> 

KR> Glass cloth shelf life

[brian.kraut at eamanufacturing.com]

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KR> First Flight Issues - Elevator Trim

[brian.kraut at eamanufacturing.com]

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KR> First Flight Issues - Elevator Trim

[Lawrence Bell]

Thanks, Sid, good heads up for the rest of us. I like your throttle setup,
I'm going to try to copy it, Larry Bell

On Tue, Mar 26, 2013 at 5:57 PM, Sid Wood  wrote:

> On the first flight, 3/23/13, moments after lift off, the elevator trim
> jumped to Full Nose Up.  Trim control in the cockpit was non-responsive.  I
> had to hold firm forward pressure on the stick to maintain level flight
> with the stick position about neutral.  The bounced landing bent the nose
> strut.
> Investigation after the flight revealed the epoxy seal on the sheath of
> the Nyrod trim tab rod had broken.  The Nyrod center rod and the sheath
> were not damaged.  The break is at the entrance to the horizontal
> stabilizer leading edge inside the fuselage.  This allowed the sheath to
> move resulting in the trim tab moving to the Full Nose Up position.  The
> fix is to secure the Nyrod sheath.  This is the same practical installation
> requirements for any Bowden cable.
> NV aero is shipping a new nose strut.
> Here are some pictures from my website showing the Trim Control in the
> cockpit at Full Nose Down, the Elevator Trim Tab at Full Nose Up, and the
> broken Nyrod sheath anchor area:
>
> http://websites.expercraft.**com/sidwood/index.php?q=log_**
> entry_id=71577
>
> Sid Wood
> Tri-gear KR-2 N6242
> Mechanicsville, MD, USA
>
>
>
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