Fast Tracks http://fasttracks.net/forums/ 

Radius of arch"N" scale http://fasttracks.net/forums/viewtopic.php?f=4&t=1317 
Page 1 of 1 
Author:  flexiflyer [ Sat Aug 01, 2015 10:40 am ] 
Post subject:  Radius of arch"N" scale 
How many degrees of arch does each "N" 24' radius cover. On my Ntrak modules, I use a 24" radius to move the 3 lines from their normal position to a position some 1216 inches toward the front of the module (the module is oversized). This is, of course, sweeping the rails into to a 24 in radius followed by a reversing radius to straighten out the run across the front of a 2 module set up. All this is reversed on the second module to bring the tracks back specified position. I am trying to figure how many pieces to order. flexiflyer 
Author:  jtfirth [ Sat Aug 08, 2015 7:15 am ] 
Post subject:  Re: Radius of arch"N" scale 
Hello flexiflyer, Each SweepStick is approximately 10" long and there are 2 SweepSticks in each package for a combined length of 20". To determine how many would be required to create a 90degree arc with an 24" diameter, for example, use the following formula: C over d equals Pi where C = Circumference, d = diameter and Pi = 3.141592 therefore, C = (24" x 3.141592)/4 = 18.850" and, 18.850" = 1 package 
Author:  hoborob [ Tue Aug 18, 2015 11:26 am ] 
Post subject:  Re: Radius of arch"N" scale 
Wanna try that again Terry. With a diameter of 24" the Circumference is determined by C = Pi * D, C = 3.14 * 24 = 75.39. with each Sweepstick being 10" long you would need 8 total to complete the full circle or 4 packages. That is unless there is some new form of math I am unfamiliar with. 
Author:  jtfirth [ Fri Aug 21, 2015 7:54 am ] 
Post subject:  Re: Radius of arch"N" scale 
To All, Sorry, my mistake. The formula should be as follows: C = Circumference, d = diameter and Pi = 3.141592 therefore with a diameter of 48", C = (48" x 3.141592) = 150.796" and a 90degree arc would be 150.796"/4 = 37.699" and, 37.699" = 2 packages (rounded up) 
Page 1 of 1  All times are UTC  5 hours [ DST ] 
Powered by phpBB® Forum Software © phpBB Group https://www.phpbb.com/ 