SEN-456 August 23 2000

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Category: Archive 2000

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News and Reports 2000 - second half
SCAT Electronic News 23 August 2000 issue 456

Table of Contents
==================
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Dihedral ribs. - Woodhouse
Dihedral ribs again !! - King
dihedral breaks - Blackam
Re: Icarex - Blackam
re: Non-Stick building surface - Andressen
Looking for a Champion Coupe - Campbell
2001 World Champs - Pudney
Looking for Icarex - Goodnow

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Dihedral ribs.
==============
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I use a similar method to Mike Fantham on my F1B's.  The end ribs are 
from 3 mm as against the main ribs being 1.5mm.  I also incude small 
balsa blocks at the corners.  The panel ends are sanded and mated, takes 
a little cut and try.  I butt glue with no keepers.  Once dry the joint 
area is covered over the te and the d box with wedges of 93gsm carbon 
cloth fixed with cyano.  I cover the carbon with Fablon (self adhesive 
plastic), the wedges are then cut to size.  Cyano is then applied to the 
surface of the wing the wedge is then laid on and rubbed down.  The 
Fablon is removed and the whole is lightly sanded.  I don't use braces as 
I am a member of the school of clean breaks!



Michael J Woodhouse



Dihedral ribs again !!
======================
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Mike Fantham's method sound like the best method by far,  provided you have 
the tools.  I guess it would be ideal if you have a power saw that cuts on an 
angle.   In this case I would cut both sides of the rib so they were the same 
thickness top and bottom.   This saves extra unnecessary material and saves a 
bit on the weight of the wood and the carbon.    My method with inserted TE 
stock, is OK but has one problem.  Because I  CF cap them after they are 
formed,  the slant in them causes a slight compound curvature in the CF caps 
which can present a problem.  I haven't found it in surmountable, but it is 
there.

Peter King

 

dihedral breaks
===============
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If I recall the original question was related to how to get really neat 
fits at dihedral joints. When I started making foil F1C wings I worked 
out how to do this.

Like many others I use thick dihedral break ribs on each side of the join 
and sand or pare the correct angle (same on both panels) in each side 
before gluing.

For me the secret to making wing panels fit together perfectly is that 
the two halves of the wing must have identical sections. To achieve this 
I always sand dihedral break ribs as PAIRS. If there's a balsa sheet 
covering (such as in an F1C wing) I thickness sand the adjacent sheets at 
the same time and laid out dihedral join to dihedral join, that way I 
know that both the ribs and the sheet covering are identical thicknesses 
at adjacent points on the section.

Then you need to be careful in actual construction that all skinning 
(whether CF shells or other sheet) is accurate and identically performed 
on both sides of the dihedral joint.

Finally I sand the dihedral angles in a temporary jig, set up the same 
for both sides. The joint is glued with epoxy (slow cure), sometimes with 
an internal dihedral brace, sometimes with a glass cloth overlay on the 
joint. A surface overlay is much more efficient at preventing broken 
dihedral joints (because it's the furthest distance away from the neutral 
axis of the structure) as long as you can bond it well to the wing skin. 
The big problem with internal dihedral braces is that when they break 
they usually do terrible structural damage as well.

Richard

 

Re: Icarex
==========
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I've seen a lot of models covered in various types of icarex fabric 
(mostly glider and power models). An interesting (subjective) observation 
I've made to myself is that none of those models seem to glide as well as 
I'd have expected (given the quality of the builders/designers/fliers). 
I've often thought that the surface texture of the icarex fabric might 
have something to do with that...

cheers
Richard

 
re: Non-Stick building surface
==============================
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Roger,


If all else fails there's always Teflon(TM).

Yes, it is hard to see thru, however there is a clear version that isn't 
used much (probably cause no one can afford it), but it does exist as I've 
seen it in action, providing non-stick barrier for clampled joints in a 350F 
oven.  Also don't know source.

Glad to be of help,
                   H

Looking for a Champion Coupe
============================
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One of my customers is looking for a Champion Coupe kit.

Lee F. Campbell     This email address is being protected from spambots. You need JavaScript enabled to view it.    1-765-289-7753


2001 World Champs
=================
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I must be looking in the wrong places (CIAM/FAI websites) - but I can't 
find the dates for the 2001 World Champs, to be held at Lost Hills.  As I 
have to calculate just how many pennies to put in the penny jar between now 
and whenever, any information will be gratefully received.

Thermals.

Jan Pudney
Adelaide, South Australia

[Jan, the date is not announced yet. It will almost certaimly be
in October 20001. October is the best flying month at Lost Hills.]

 

Looking for Icarex
===================
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Icarex sounds interesting as a covering material. Where can I order some? 
Thermals: Brooks Goodnow
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________________________________________________________________________
Roger Morrell

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