peter-s-c said:
The Snowbee rating system of 44 grams for any length of head has me confused as normally the shorter the head, the lighter so as to produce the same load.
Confused....I doubt it but here's what I hope is a reasoned answer to a good question...
Snowbee first introduced its 3D Spey system of producing various head lengths with the same head weights in 2003. The Scandinavian-Spey lines, introduced this year, have given us the opportunity to go slightly shorter with a 44ft head, with the same ‘Optimum Head Weights’ (OHW), we felt we’d already matched to the Snowbee XS-P Spey Rods. The OHW being based on the ideal head weight needed to load a rod effectively by an ‘Average’ caster.
Yes, a more accomplished Spey caster might opt for a lighter line to load his rod over a long cast, whilst the total beginner might need to go slightly heavier for a short cast. The OHW is what we all recognise as the line best suited to the ‘Sweet Spot’ of any fly rod…..sounds a bit like Goldilocks…..
….but eventually you find the line weight that’s just right!
The thinking behind this system involves each respective head length requiring a different amount of ‘casting energy’ for the positioning of an energised ‘D’ loop, which in turn creates an equal amount of loading on the rod.
It is generally accepted that a long line of say 75ft will ‘feel’ light when hanging outside the rod tip compared to a short line of the same head weight. However, the long line has a greater length of line ‘stuck’ in the surface film compared to that of the short line. Consequently, the longer line will at the same time produce a greater degree of rod loading during the lifting phase of the cast, compared to the short line.
If we are to create an energised ‘D’ loop with a long line, we require a long stroke and an increase in ‘casting’ energy. Conversely, the short line, whilst still being of the same weight, requires only minimal energy to position the ‘D’ loop. What’s different is we have the added ‘feel’ in the weight of the short line loading the rod.
Short Head = Heavier Line ‘feel’ (line rod loading) = Less Casting energy = Rod loads effectively
Long Head = Lighter line ‘feel’ = Increased Casting energy (applied rod loading) = Rod loads effectively
Speyliner