NavList:

   

Reply

I also had a look at Datalizer.  They offer 2D models, not 3D.

Gary's 2D model requires motion in X and Y to align scale 1 to scale 2.  This 
combined motion cannot be executed in the models shown on the Datalizer site.

A linear 2D model, such that it conforms to the type of models offered by 
Datalizer, would be huge.  Ronald has determined the length of the scales and 
they would be impractical for a linear 2D type of slide (4.143 meters and 
7.584 meters for inner and outer scales, respectively).  This assumes, of 
course, that you would wish to maintain the result within 1-2 arc minutes. 
Further, these lengths presume that you only wish to solve for when the 
values are between 0d 20' and 89d 40'

Similar rules (Otis cylindrical and Fuller cylindrical) have very long scales 
that are made practical by wrapping around a cylinder.  As a practical 
matter, once the length of the scales is above 0.5 meters, these become a 
nightmare to store and use.

In a study provided to the NavList, I estimate that to obtain 1 arc minute 
errors over 0 to 90 degrees, inclusive, you need a scale length on the order 
of 70+ KILOMETERS, highly impractical.  In order to use this, in a 2D model, 
you would align the scales and then get in your car to drive to the other end 
to observe results.

I believe Datalizer to be a non-starter.

Best Regards
Brad



-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of rob
Sent: Wednesday, July 22, 2009 9:57 AM
To: NavList
Subject: [NavList 9178] Re: Bygraves


according to a pdf on the site, typical one time setup fees are
$1,500.00 and run costs 3-5 per unit (I think this assumes commercial
runs in the 1,000s). Seems interesting.

Rob

>
> PS: To your knowledge has anybody talked to " Datalizer Slide Charts" 
(datalizer.com)? The site seems to be indicating they are open to small runs 
of related products.
>



"Confidentiality and Privilege Notice
The information transmitted by this electronic mail (and any attachments) is 
being sent by or on behalf of Tactronics; it is intended for the exclusive 
use of the addressee named above and may constitute information that is 
privileged or confidential or otherwise legally exempt from disclosure. If 
you are not the addressee or an employee or agent responsible for delivering 
this message to same, you are not authorized to retain, read, copy or 
disseminate this electronic mail (or any attachments) or any part thereof. If 
you have received this electronic mail (and any attachments) in error, please 
call us immediately and send written confirmation that same has been deleted 
from your system. Thank you."

--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---

   

Reply