[ULF-1] New spar cap width questions

From: Member 62
Date: 2010-10-11 21:00 UTC+01:00
Message: #0252

Hi, 

Sorry if this has been posted before, but I didn't find it 
searching the archives ...

The technical notes show a new Spar Cap 
width diagram.  It is a little difficult to get all the readings from 
such a small diagram though, so I have a few questions.

1)  I presume 
that the plan view of the width shown in the diagram is with the 
leading adge towards the top of the page.  Is this correct ?

2)  It is 
not clear how far along the spar cap changes from being 30mm wide to 
tapering down to 9mm.  It looks like it may be at rib 2.  Can anyone 
confirm this ?

3)  If 1) is correct, this means fixing the ply webbing 
to a face with two changes of angle.  Should there be a gentle radius 
at these points ?

4)  The wing rib diagrams show a common line for the 
back of the spar, but at ribs one and two there will be 1mm ply on the 
back of the spar.  Why does this not appear to be taken into account on 
the marked profiles ?  Rib one (L/E) is shown 32mm in front of the back 
of the spar (cap?), while I would expect it to be 31mm, and the rear 
section to start 1mm behind the (spar cap) line.  I hope what I mean by 
this is clear !

I'm sure there are people out there who have built 
spars to this new specification, but it all seems to be pretty quiet, 
both here and on the yahoo group, when it comes to people who are 
actually building - and I know I'm going to have plenty of questions.


Hope someone can help.

Thank you.

Member 62