Hurricane Mk Is

[canonuk]

Hi guys,

I've been gathering various references and photos etc and have been trying to get the early and late Hurricane Mk I variants sorted in my head. So far I think I've got a basic idea, but I'm still unsure about a few points.

The way I understand it is the main difference between the early and late MkIs was the fabric/metal wing. I'm aware that the early MkIs were fitted with a 2-blade propellor, but some were retrofitted with 3-blades. That makes it awkward for me to distinguish based on that feature. Also, the ventral strake present on late MkIs also seems to sometimes be present on early MkIs

As you can see, I'm pretty confused. Would someone be able to help me with some nice clear rules/answers for ID?

Many thanks for any help,

Joe