Possibly!
I tend to look at other motors within the seagull range (40 series for example) and see which changes i can spot for a specific time period.
You might be right Chas. in that the 4 bladed cloverleaf props (same things happening in the 40 series with LS's and early SJP's) could have been produced till the mid/late 50's, but i think it's perhaps somewhere nearer 57 when an exterior design change to the gearboxes across the board from holed to slotted water inlets. This i think is a fundamental change to props from rounded blades (cloverleaf etc.) to square blades (hydrofan etc.) across the entire motor line up. Late 70's/early 80's onwards different again due to gearbox differences, same with props for these motors.
As its been suggested previously in other topics there have been several different types of props, common and not so common, weedfree,big and small etc. etc. with some being better than others in that they don't pick up so much weed as others. 1970's seems to have quite a few variations on "weedfree" within the 102 line. There's 2 and 3 bladed "meatcleavers" as i call them, maybe even a 4 bladed version too (very different in shape to anything before or after a cloverleaf or bowtie)
Trying to work out which prop was fitted to any particular motor when it left the factory can be a minefield at times as so many of these motors have been doctored at some point in their lives, but slowly i think i'm getting there with it until someone finds something hidden in a box for years that puts all our thinking in the bin
Which reminds me, how far did we get with a prop recognition thingamewotsit that somebody was trying to do.
That would help loads.
At least we could start trying to put some dates more accurately to some of these props.
Jon
