Re: [ULF-1] Reconcile Rear Fin Spar Widths with Loft Diagram

From: Member 72
Date: 2012-06-06 21:21 UTC-04:00
Message: #0377
Hi Dieter,

Thanks. We will set the spar heights from the loft lines shown on drawing No. 18.  I think our confusion began because we are building over the spar drawings enlarged to full scale with a professional copy machine.  When we did this, the enlarged front spar drawing measured out correctly, but we could not make the rear spar drawing "fit".  This puzzled us, and we thought we were somehow measuring incorrectly.  We will make the necessary adjustments to the full scale drawing of the rear spar as needed to make sure the ribs will fit.

Best regards,
Member 67


---- Member 9 <[email]> wrote: 
> Hi Member 67,
> 
> all spar heights must be taken from the loft line drawings.
> 
> In this case see drawing No. 18
> 
> Regards,
> 
> Dieter
> 
> 
> 
> 
> -----Ursprüngliche Nachricht----- 
> From: Member 50
> Sent: Wednesday, June 06, 2012 7:15 PM
> To: [email]
> Subject: Re: [ULF-1] Reconcile Rear Fin Spar Widths with Loft Diagram
> 
> Member 67, Have you taken into account the doubler built into the fin rear
> spar where it is attached to the fuselage. This is through the position of
> rib one (base rib) and effectively takes up the space of the rear of the
> largest fin rib, it means the rib is shorter than it would be if the doubler
> was not present.
> 
> Andy Member 50
> 
> 
> 
> 
> 
> -----Original Message-----
> From: [email] [mailto:[redacted]
> On Behalf Of [email]
> Sent: 06 June 2012 03:26
> To: [email]
> Cc: [email]
> Subject: [ULF-1] Reconcile Rear Fin Spar Widths with Loft Diagram
> 
> Folks,
> 
> Our rudder and elevator spars are built.  We are starting on the fin spars
> and have planed the spar caps to their double taper as per plan.
> 
> We are having difficulty reconciling the width of the rear spar plan drawing
> with the rib widths on the loft diagram.  The widths of ribs #1,2,4,6, and 8
> on the rear fin part of the loft diagram do not match up at all with the
> width of the rear spar drawing at the respective rib stations.  In fact,
> they are way off. The front spar drawing seems to be OK.
> 
> Has anyone noticed any discrepancies in the rear fin spar drawing??  My
> build team and I are quite perplexed by this.  Should we just modify the
> rear spar plan to match up with the rib widths shown on the loft diagram??
> 
> Many thanks for your help,
> Member 72
> 
> 
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