2.1. Rankine’s method of tangential angles

Try these first

1. 1.

   What is a deflection angle?

   Hint

   Think about how curves are measured.

2. 2.

   What instrument is commonly used in Rankine’s method?

   Hint

   This instrument measures angles.

3. 3.

   What is the formula for calculating deflection angles in Rankine's method?

   Hint

   Remember the components - chord and radius?

4. 4.

   The total deflection angle for multi-chord curves can be calculated as the sum of what?

   Hint

   Think about how angles build upon each other.

5. 5.

   You have a radius of 75m and a chord length of 60m. Calculate the deflection angle and explain why it's essential.

   Hint

   Plug into the formula and think of the implications of misalignment.

6. 6.

   If you mistakenly calculated the deflection angles without subtracting for a left-handed curve, what might the consequence be?

   Hint

   What role do adjustments play in maintaining accuracy?