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Hanker
Posts: 6
Location: Ronan, U.S.A.
Joined: 2/19/2009
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Curve Formulas |
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| Hello all, I am preparing to retake my Mt. PLS exam in April, and this may sound way off course but,......can any of you all tell me some of the formulas for horizontal curve resolution? I am writing a program for the HP50 that will allow you to enter any 2 of the main components, less degree of curve. I am lacking a few and developing ulcers looking for and/or trying to derive my own formulas. Any reply appreciated, thanks
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Sunday, March 01, 2009 at 4:58:40 AM |
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Thomas LaCorte
Posts: 62
Joined: 10/17/2008
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Re: Curve Formulas |
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| Go buy a blank field book at the local survey supply shop. They have lots of curve formulas in the back. Good luck on the test!
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Sunday, March 01, 2009 at 9:23:26 AM |
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Dave Lindell
Posts: 14
Location: Hacienda Heights, USA
Joined: 10/20/2008
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Re: Curve Formulas |
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Well...there's the radius, tangent, chord, middle ordinate (sagitta), external, arc length, central angle (delta), apothem (radius minus sagitta).
If you are ready to take a PLS exam you should be able to derive these by simple trigonometry.
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Sunday, March 01, 2009 at 6:15:51 PM |
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james.roepel
Posts: 3
Joined: 3/13/2009
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Re: Curve Formulas |
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| Hanker, your going for the PLS Exam. If you dont have these formulas to memory and are relying on a programable calculator to give you the answer, you are not ready for the exam. Secondly, as Thomas said, get a peg book. With the required experiance needed for the exam I am suprised that don't have one. Advise, hit the books hard, and keep hitting them for another year. With the extra time and gained knowledge you will lose that ulcer and take that exam with confidence!
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Friday, March 13, 2009 at 1:04:57 PM |
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Hanker
Posts: 6
Location: Ronan, U.S.A.
Joined: 2/19/2009
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Re: Curve Formulas |
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| James, I appreciate the input, but don't need the attitude. I can calculate anything that has ever been put in front of me, short of spirals, and the exam had less than a dozen questions on it requiring trig calcs anyway. What I said is that I am trying to write a program to solve for the curve data. I want to be able to input any 2 of the 7 main components and solve for the remaining components. You are quick to respond, but not help. Can any of you solve a horizontal curve knowing only the LC and the L?
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Monday, March 16, 2009 at 1:42:57 PM |
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Isleno
Posts: 40
Location: Gonzales, La USA
Joined: 10/20/2008
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Re: Curve Formulas |
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| The manipulation of equations to provide for differing known values is called Algebra. There two solutions for a given LC and L depending upon the delta angle. (Think about it). Calculation is different from deriving equations. If you want to derive equations based upon known relationships, you need to brush up on your algebra and your manners.
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Tuesday, March 17, 2009 at 9:37:11 AM |
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Isleno
Posts: 40
Location: Gonzales, La USA
Joined: 10/20/2008
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Re: Curve Formulas |
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| Oooops, There are two delta angles for a given LC and Radius, only one LC and L. My bad.
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Tuesday, March 17, 2009 at 10:50:05 AM |
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Isleno
Posts: 40
Location: Gonzales, La USA
Joined: 10/20/2008
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Re: Curve Formulas |
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| Oooops, There are two delta angles for a given LC and Radius, only one LC and L. My bad.
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Tuesday, March 17, 2009 at 10:50:07 AM |
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Isleno
Posts: 40
Location: Gonzales, La USA
Joined: 10/20/2008
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Re: Curve Formulas |
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| Oooops, There are two delta angles for a given LC and Radius, only one LC and L. My bad.
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Tuesday, March 17, 2009 at 10:50:09 AM |
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Hanker
Posts: 6
Location: Ronan, U.S.A.
Joined: 2/19/2009
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Re: Curve Formulas |
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| Oh, well pardon me for not labeling things as you might like. It matters not to me if you want to call it rocket science, oragami or meditation. The point is rote memory is one thing, writing a program is another, and sitting for the LS exam is yet another. I didn't say I cannot calculate a curve. I said I want to write a program that will allow you to enter any 2 components and have the program return the remaining components. And as far as manners, hmmm. Let's see here, how can I put this that you will find ethically proper???? Seeing as how I asked for help so that I could write this program and got nothing but criticism, I don't think I am the one lacking in manners.
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Tuesday, March 17, 2009 at 5:37:59 PM |
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Isleno
Posts: 40
Location: Gonzales, La USA
Joined: 10/20/2008
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Re: Curve Formulas |
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Hanker:
You got me. I couldn't do it. The length of arch and long chord relationship require the solution of the theda angle and the sin of theda/2. I could reach a soultion through an iterative process, but could not find a simple solution. Maybe some body else can. I give up. I tried it through cartesian coordianes as well and it fell to an iteraive process also.
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Tuesday, March 17, 2009 at 9:14:38 PM |
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Hanker
Posts: 6
Location: Ronan, U.S.A.
Joined: 2/19/2009
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Re: Curve Formulas |
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| Isleno, I sincerely appreciate your response. I have a "competitive challenge" with my dad about which one can write the program first. Now, he has about 6 years on me programming the HP48 so the odds are in his favor but a fun endeavor nonetheless. Again, I thank you. Have a good day!
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Tuesday, March 17, 2009 at 10:39:56 PM |
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james.roepel
Posts: 3
Joined: 3/13/2009
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Re: Curve Formulas |
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| I finally got back to this thread. Did you get into the poison oak that day? You confused my encouragement for your study for an attitude. Yes Hanker. I wrote a program for the 48 that does that, and many other cool little field tool programs. Good Luck!! You will be burning a lot of midnight oil to replicate them. Now...... that's attitude.
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Friday, August 14, 2009 at 6:18:00 PM |
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