Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 19-04-2020, 11:00   #1
Registered User

Join Date: Oct 2016
Location: Monroe, Ga
Boat: 1987 Sabre 42 C/B
Posts: 348
Parallel rule/distance question

To those smarter than me... when measuring between 2 points on a chart that is longer than my parallel rule is there a trick other than grabbing a longer ruler to connect the dots?

Thanks for the help

Foster
flee27 is offline   Reply With Quote
Old 19-04-2020, 11:06   #2
Registered User

Join Date: Jul 2016
Location: East Coast USA
Boat: Boatless at the moment
Posts: 918
Re: Parallel rule/distance question

If you have a pair of dividers, set the dividers to a known distance on the chart's scale and "walk it off" by going point to point.
kenbo is offline   Reply With Quote
Old 19-04-2020, 11:09   #3
Registered User

Join Date: Oct 2016
Location: Monroe, Ga
Boat: 1987 Sabre 42 C/B
Posts: 348
Re: Parallel rule/distance question

I am trying to draw the course line to measure degrees on the compass rose. I can’t connect the dots with the parallel rule. I did it with a yard stick but was curious if there is a trick using normal plotting tools.

Thanks
flee27 is offline   Reply With Quote
Old 19-04-2020, 12:08   #4
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 13,386
Re: Parallel rule/distance question

If I understand your question, you can "walk" parallel rulers all over a chart regardless of how far apart the points are located. This is their purpose...to move a line parallel to the original to another point on the chart. For example, from a course line to the nearest compass rose.

A good demostration here:

https://youtu.be/xKSBYfscA80

You can use a similar technique to extend a line or connect two points which are seperated by a distance longer than the parrallel ruler.
belizesailor is offline   Reply With Quote
Old 19-04-2020, 12:27   #5
Marine Service Provider
 
Snore's Avatar

Join Date: Jan 2011
Location: St. Petersburg, FL
Boat: Moving Other Peoples Boats
Posts: 3,499
Send a message via Skype™ to Snore
Re: Parallel rule/distance question

The only ways I know to make sure your course line intersects the two dots are

a) the obvious- use a longer straight edge or

b) a second ruler/straight edge that is placed such that the two rulers overlap for about 3Ē. This effectively lengthens the original ruler.
__________________
"Whenever...it requires a strong moral principle to prevent me from deliberately stepping into the street, and methodically knocking people's hats off- then, I account it high time to get to sea..." Ishmael -a link to my delivery website is in my profileó
Snore is online now   Reply With Quote
Old 19-04-2020, 12:29   #6
Registered User

Join Date: Oct 2016
Location: Monroe, Ga
Boat: 1987 Sabre 42 C/B
Posts: 348
Re: Parallel rule/distance question

Thanks for all the responses. I guess I am not asking my question clearly. I understand walking with the parallel rule. My question is not as much for practical usage but for testing. With testing, the answer (as I understand) have to be within 2 degrees. I donít feel like I can guess the angle between 2 places at opposite ends of the chart and walk the line accurate enough to be with in 2 degrees.
Attached Thumbnails
Click image for larger version

Name:	198D47BF-C4DE-4E03-87A2-67C39F63EA30.jpg
Views:	58
Size:	449.6 KB
ID:	213227  
flee27 is offline   Reply With Quote
Old 19-04-2020, 12:30   #7
Registered User

Join Date: Oct 2016
Location: Monroe, Ga
Boat: 1987 Sabre 42 C/B
Posts: 348
Re: Parallel rule/distance question

Thanks snore. That’s all I could come up with. Was thinking there might be some trick I was missing.
flee27 is offline   Reply With Quote
Old 19-04-2020, 12:53   #8
Registered User

Join Date: Apr 2020
Boat: Amel 53, Super Maramu
Posts: 428
Re: Parallel rule/distance question

A "trick" that has almost always worked for me: Use the edge of the chart. It's straight. Just use the edge of the paper to extend the line of the rules. It is always there...

Depending on how you fold/roll your charts it might not work for you, but it is one I keep in my back pocket for those long course or bearing lines.
SVHarmonie is offline   Reply With Quote
Old 19-04-2020, 13:01   #9
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 13,386
Re: Parallel rule/distance question

Quote:
Originally Posted by SVHarmonie View Post
A "trick" that has almost always worked for me: Use the edge of the chart. It's straight. Just use the edge of the paper to extend the line of the rules. It is always there...

Depending on how you fold/roll your charts it might not work for you, but it is one I keep in my back pocket for those long course or bearing lines.
You can also use this trick to mark some intermediate points and then walk off and draw a straight line w the parallel ruler.
belizesailor is offline   Reply With Quote
Reply

Tags
rule

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Parallel wiring question Mr O Electrical: Batteries, Generators & Solar 4 11-08-2017 09:40
Question: Batteries in Parallel, all loads from main + & - Mr Big Electrical: Batteries, Generators & Solar 33 14-10-2015 22:30
Chargers in parallel, lowish output question. neelie Electrical: Batteries, Generators & Solar 13 12-04-2014 09:34
Rule Hose (for Rule Pumps) kjames Plumbing Systems and Fixtures 3 09-01-2012 05:51
Four Solar Panels - Parallel , Series or Series-Parallel west coaster Electrical: Batteries, Generators & Solar 76 07-07-2011 14:35

Advertise Here


All times are GMT -7. The time now is 11:31.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.