Re: [ULF-1] Reduced scale drawings

From: Member 72
Date: 2018-05-23 12:58 UTC-04:00
Message: #0585
Hi Austin,

This one time I recommend you NOT do what we tried with enlarging the drawings to full size.  Although Dieter’s plans drawing are very good, when one blows them up to full scale, like we did for the tail spars, errors creep in, and they become inaccurate.  We had to hand draw out the corrections over the blowups to keep all the dimensions true.  This was a pain.  It would have been cheaper and quicker just to hand draw to full scale on white paper to start with!  This is what we did on the rest of the assemblies.  We pinned these drawings down to a flat building board with thumb tacks, covered with wax paper, and built over that—just like a big model plane kit!

Best regards,
Member 67


Sent from my iPhone

> On May 22, 2018, at 6:12 PM, Member 111 <[email]> wrote:
> 
> Hello again everyone 
> 
> I noticed in Member 67’s picture build log that it looked as if he had enlarged the drawings of the horizontal stabilizer spar and the main bulkhead specifically, and laid up the parts right over this. The folks at alpha graphics tell me that this is prohibitively expensive to do, since their personnel would have to go through the scan and crop to make it fit on their large format paper.  I will try a different copy shop to see if they have a different answer.  If anyone has a better way to do this please let me know. Reading through the plans and build guide, it seems that Dieter wants the builder to hand draw the dimensions out using the loft line drawings as the final controlling dimension.  I guess that blowing up a scaled drawing doesn’t get you this unless you match it up carefully to the loft lines at the spars. Which brings me to me next nagging question: is the loft line drawing printed on a stable medium? It looks and feels like regular copy paper, is the purpose of using it as the control to standardize any irregularity in dimensional stability, ie everyone’s playing. 1/4 step off to the same tuning fork?
> 
> Thanks
> 
> Austin in UT
> _______________________________________________
> ULF-1 discussion list -- [email]
> 
> Subscribe, Unsubscribe, Preferences, List information:
> http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com