KR> Surface temps & paint

[Timothy Witmer]

Enclosed find the graph chart for aviation paint colors & surface temps.
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KR> Post curing wings

[Pat and Robin Russo]

Well done! It is always  good advice when backed by research. Thanks.

-Original Message- 
From: Oscar Zuniga
Sent: Saturday, November 02, 2013 1:47 PM
To: krnet at list.krnet.org
Subject: KR> Post curing wings


Good information about post-curing.  Check the heat distortion temperature 
for the foam board that you're using if you decide to post-cure.  Some of 
the molded polystyrene boards (such as pink Owens-Corning Foamular; blue Dow 
Styrofoam) have heat distortion temperatures in the 100-105C range 
(210-220F), but others may be lower.  If the foam substrate gets into those 
temperatures, you could find that the piece that you're post-curing may take 
on some permanent distortion.

This topic has come up over the years when discussing the use of less 
reflective, generally darker paint colors on composite airplanes with a foam 
substrate... like the KR.  A darker airplane parked out in the sun can 
develop temperatures in the foam that can exceed the distortion temperature, 
which is one of the reasons that KRs have traditionally had white or light 
colored paint jobs.  Not saying that it will melt like Icarus' wings, but it 
could result in a droop, twist, or other distortion.

The urethane foams (such as Last-A-Foam) have much higher distortion 
temperatures than polystyrene board.

Oscar Zuniga
Medford, OR

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KR> W apps

[smwood]

The Excel spread sheet that we used at the 2013 Gathering does the same 
thing as these apps.  A plot of CG numbers is included at the bottom of the 
spread sheet (standard Excel operations).  E-mail me off-line and I will 
send you a copy for free.

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

-
> From AOPA
> Thought some might be interested
> Larry Flesner
> ++
>
> Weighing in on weight-and-balance apps
>
> October 28, 2013
>
> By Ben?t J. Wilson
>
> Weight-and-balance apps seem to be very popular
> with pilots. The last time I did a column on them
> June
> 6, I received a flood of others they say I
> missed. So here are five more recommended by
> members. These are not endorsements of any app.
>
> FlightScale ($3.99  in
> iTunes
> and $1.99 in
> Google
> Play)?This tablet app allows users to add
> aircraft data, including the envelope limits, and
> see the weight and center of gravity plot on a
> live graph. The app includes three different
> templates that allow users to enter data for analysis.
>
> EZ Load ($3.99 in
> iTunes)?This
> iPhone/iPad app was designed for users of smaller
> general aviation aircraft to do accurate checks
> of weight and balance. Users enter the necessary
> information for each aircraft type and the app
> provides four primary and one auxiliary view:
> list, main, graph, description, and info.
>
> Avilution Weight and Balance ($4.95  in
> Google
> Play)?This smartphone app can compute aircraft
> weight, balance, mean aerodynamic chord, and
> center of gravity. The weight/balance range information is shown on a 
> chart.
>
> Aircraft Weight and Balance ($9.99 in
> Google
> Play)?This smartphone app is preloaded with the
> Cessna 152, Cessna 172, and Piper Cherokee, but
> you can add and remove aircraft as needed.
> Features include ability to enter fuel by weight
> instead of volume, compute weight shift/ballast
> suggestions when needed, and share reports via email or save to an SD 
> card.
>
> NextGen Systems Weight & Balance (free in
> iTunes)?This
> iPhone app allows users to customize the
> parameters of almost everything and include all
> of their airplanes under a single program.
> Features include building an airplane (this will
> cover more than 80 percent of the general
> aviation fleet), creating a load sheet with
> graph, and offering in-app tech support and
> tutorials. While the app is free, users must pay
> between $3.99 and $4.99 for each aircraft type.

KR> Post curing wings

[Oscar Zuniga]

Good information about post-curing.  Check the heat distortion temperature for 
the foam board that you're using if you decide to post-cure.  Some of the 
molded polystyrene boards (such as pink Owens-Corning Foamular; blue Dow 
Styrofoam) have heat distortion temperatures in the 100-105C range (210-220F), 
but others may be lower.  If the foam substrate gets into those temperatures, 
you could find that the piece that you're post-curing may take on some 
permanent distortion.

This topic has come up over the years when discussing the use of less 
reflective, generally darker paint colors on composite airplanes with a foam 
substrate... like the KR.  A darker airplane parked out in the sun can develop 
temperatures in the foam that can exceed the distortion temperature, which is 
one of the reasons that KRs have traditionally had white or light colored paint 
jobs.  Not saying that it will melt like Icarus' wings, but it could result in 
a droop, twist, or other distortion.

The urethane foams (such as Last-A-Foam) have much higher distortion 
temperatures than polystyrene board.

Oscar Zuniga
Medford, OR 

KR> W apps

[Larry Flesner]

 From AOPA
Thought some might be interested
Larry Flesner
++

Weighing in on weight-and-balance apps

October 28, 2013

By Ben?t J. Wilson

Weight-and-balance apps seem to be very popular 
with pilots. The last time I did a column on them 
June
 
6, I received a flood of others they say I 
missed. So here are five more recommended by 
members. These are not endorsements of any app.

FlightScale ($3.99  in 
iTunes 
and $1.99 in 
Google
 
Play)?This tablet app allows users to add 
aircraft data, including the envelope limits, and 
see the weight and center of gravity plot on a 
live graph. The app includes three different 
templates that allow users to enter data for analysis.

EZ Load ($3.99 in 
iTunes)?This 
iPhone/iPad app was designed for users of smaller 
general aviation aircraft to do accurate checks 
of weight and balance. Users enter the necessary 
information for each aircraft type and the app 
provides four primary and one auxiliary view: 
list, main, graph, description, and info.

Avilution Weight and Balance ($4.95  in 
Google 
Play)?This smartphone app can compute aircraft 
weight, balance, mean aerodynamic chord, and 
center of gravity. The weight/balance range information is shown on a chart.

Aircraft Weight and Balance ($9.99 in 
Google
 
Play)?This smartphone app is preloaded with the 
Cessna 152, Cessna 172, and Piper Cherokee, but 
you can add and remove aircraft as needed. 
Features include ability to enter fuel by weight 
instead of volume, compute weight shift/ballast 
suggestions when needed, and share reports via email or save to an SD card.

NextGen Systems Weight & Balance (free in 
iTunes)?This 
iPhone app allows users to customize the 
parameters of almost everything and include all 
of their airplanes under a single program. 
Features include building an airplane (this will 
cover more than 80 percent of the general 
aviation fleet), creating a load sheet with 
graph, and offering in-app tech support and 
tutorials. While the app is free, users must pay 
between $3.99 and $4.99 for each aircraft type.