KR> First Flight Issues - Elevator Trim

[Dan Heath]

As you all know, I even used half a mirror motor from a Mercury side mirror.
And it worked fairly well, but I eventually found it slipping.  On my first
KR, I used the push rod type you are talking about and that is why I went to
the electric trim motor.  However, I eventually found that you cannot beat
quality and reconciled myself that airplanes, even KRs are not supposed to
be cheap.  

I installed the Ray Allen trim servo using the mount bracket from VANS
Aircraft and it works perfectly all the time and I never have to be
concerned about it again.  I only wish I had done it right the first time.

See N64KR at http://KRBuilder.org - Then click on the pics?
See you Oct. 4 and 5, 2013 - KR Gathering in Mt. Vernon, Il ? MVN 
Daniel R. Heath -?Lexington, SC

-Original Message-

I am guilty as charged and hang a stupid hat on me. I assumed that since
everyone else (or I thought) was using it, it was the right product to use.
(Nyrod) I have struggled with this issue since the beginning and just
thought " what the heck is wrong with me?because?I cant get it to work and
everyone else can? "?

KR> First Flight Issues - Elevator Trim - Nyrod

[Mark Langford]

Wayne Tokarz wrote:

>> Nyrod seems to be a very popular product here in the KR group, but
honestly, I am confused, why would anyone use Nyrod at all? <<

People use it because the plans call for it and Rand Robinson sold it as
part of the KR kits.  It is lightweight stuff, but those who don't mind
trading a little money and weight for improved safety and reliability have
been moving toward Ray Allen (formerly MAC) trim servos instead...

Mark Langford
ML at N56ML.com
see experimental N56ML at www.N56ML.com 

KR> First Flight Issues - Elevator Trim

[Jeff York]

Mark,

I am guilty as charged and hang a stupid hat on me. I assumed that since 
everyone else (or I thought) was using it, it was the right product to use. 
(Nyrod) I have struggled with this issue since the beginning and just thought " 
what the heck is wrong with me?because?I cant get it to work and everyone else 
can? "?

I guess after reading your :

?"The outer sheath issueyou had Sid, has ALWAYS been an issue with this product 
and has caused more
than its fair share of grief in models. NOTHING known to man will stick to

it and because of its oily nylon composition, even clamps slide on it."??

Heck, I thought I was just an idiot for not being able to get mine to work 
right. I even replaced the Nyrod sheath several times somehow thinking if I 
replaced it, it would fix it.?

Short of tearing out a bunch of fiberglass to replace the Nyrod sheath , what 
can I use in its place and where can I get it ??

Jeff



 From: Wayne Tokarz 
To: 'KRnet'  
Sent: Thursday, March 28, 2013 11:38 AM
Subject: Re: KR> First Flight Issues - Elevator Trim

Nyrod seems to be a very popular product here in the KR group, but honestly,
I am confused, why would anyone use Nyrod at all? I have been a modeller for
over 40 years and a homebuilder/pilot for over 30, this is a terrible
product, we used to crash models because of how badly they would go out of
trim due to expansion co-efficient of this product. The outer sheath issue
you had Sid, has ALWAYS been an issue with this product and has caused more
than its fair share of grief in models. NOTHING known to man will stick to
it and because of its oily nylon composition, even clamps slide on it. I see
its attractiveness, but the reality of it is, do you want to trust your
investment and potentially your life on this? Yours should be a lesson to
all KRers. 
? On a positive note, I'm really happy this ended as well as it did and
obviously it was due in part to your most professional handling of the
situation and expert piloting skills. Thanks for sharing and helping
everyone to avoid another potential pitfall.

Wayne

-Original Message-
From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Sid Wood
Sent: March-26-13 6:58 PM
To: krnet at list.krnet.org
Subject: KR> First Flight Issues - Elevator Trim

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&log_id=71577

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



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KR> First Flight Issues - Elevator Trim

[Wayne Tokarz]

Nyrod seems to be a very popular product here in the KR group, but honestly,
I am confused, why would anyone use Nyrod at all? I have been a modeller for
over 40 years and a homebuilder/pilot for over 30, this is a terrible
product, we used to crash models because of how badly they would go out of
trim due to expansion co-efficient of this product. The outer sheath issue
you had Sid, has ALWAYS been an issue with this product and has caused more
than its fair share of grief in models. NOTHING known to man will stick to
it and because of its oily nylon composition, even clamps slide on it. I see
its attractiveness, but the reality of it is, do you want to trust your
investment and potentially your life on this? Yours should be a lesson to
all KRers. 
  On a positive note, I'm really happy this ended as well as it did and
obviously it was due in part to your most professional handling of the
situation and expert piloting skills. Thanks for sharing and helping
everyone to avoid another potential pitfall.

Wayne

-Original Message-
From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Sid Wood
Sent: March-26-13 6:58 PM
To: krnet at list.krnet.org
Subject: KR> First Flight Issues - Elevator Trim

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&log_id=71577

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



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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&log_id=71589

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

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&log_id=71577
>
> Sid Wood
> Tri-gear KR-2 N6242
> Mechanicsville, MD, USA
>
>
>
> __**_
> Search the KRnet Archives at 
> http://tugantek.com/**archmailv2-kr/search
> .
> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
> please see other KRnet info at http://www.krnet.org/info.html
> see 
> http://list.krnet.org/mailman/**listinfo/krnet_list.krnet.orgto
>  change options
>

KR> First Flight Issues - Elevator Trim

[Sid Wood]

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&log_id=71577

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