The Physics of Fly Casting
Fly casting is merely a combination of action and physics. If you can understand the physics relating to fly casting, then you can have an accurate cast. First, you need to have an understanding of kinetic (moving) energy and potential (stored) energy. When many people think about fishing, they think about strength and casting heavy gear out there. All you really have to understand are the essential movements:
- Pull all of the line out that you intend to use in your cast
- REMEMBER: ONE CAN ONLY CAST AS FAR AS THE LINE YOU LET OUT
- Do some initial casts to get the line out the top guide so it is ready for your cast
- When you are all set to cast, strip down to make the line you have out taught
- This is where the physics really come in. When you pick up the line to cast it, you are creating kinetic energy with your rod. It is like the movement of pushing down a spring. You are loading it.
- When you reach the back of your cast, do a sudden stop without breaking your wrist. You want to make your rod tip bend, thus transferring the kinetic energy to potential energy. It is like the spring you theoretically just pushed down. It has the potential to do work.
- Once you have achieved a sudden stop, watch your line straighten out behind you so that you avoid tangles.
- DO NOT START YOUR FORWARD CAST UNTIL THE LINE HAS STRAIGHTENED OUT BEHIND YOU
- Now transfer all of that potential energy into your forward cast. Remember this is not about strength, it is about using the fly rod as a tool to direct energy into the fly line.
- Begin to accelerate forward. It doesn’t matter what your hands or arms are doing, the tip is the important part. The tip needs to be kept high to keep a tight loop in your fly line (I will discuss loops in a late post).
- Remeber that your line will go exactly in the direction that you rod stops. So forget about where your hand or arm is pointed. Look to the tip because all of that energy is being directed at the fly line through the tip of your rod.
- As they say, “It is like flicking paint off a paintbrush”. The faster you stop, the more paint you will get off that brush. So don’t hesitate to be abrupt in your stop.
Now it has been awhile since I took any form of physics, but I think these tips will come in handy. I hope it helps if you are a physical thinker. Happy fishing!
