I'd imagine the frog is a manufacturing artifact. But if it improves the chance of having a good functioning plane, then that's a positive.
Most of the planes over here after single iron planes went nearly extinct are common pitch. They're that pitch for a reason, because it is more effective with a double iron than is 50 or 55 degrees, but you can still use it as a single iron if you like. It works a much wider range.
The shame of it is that nobody is building a stanley bailey type plane that is similar in spec to a stanley bailey type plane built 100 years ago (including the good fine grained and not overhard iron).
I've bought a lot of vintage woodies with double irons, and some with single irons, the double iron planes are much more capable and except for two smoothers I had (one was craftsman made and senselessly bedded at 55 degrees with a double iron, the other was a modern sorby plane bedded at 50), the rest have been common pitch, including a bunch of other smoothers, but all of the try and jack planes have been common pitch. My lone remaining single iron jointer of good quality (as opposed to a later budget option - it's an early 1800s plane) is bedded at 50. It's unfortunate, as pretty as the plane is itself, it's out of its league (by a wide margin) vs. a common pitch double iron plane in every single planing task - except if a user doesn't know how to set a cap iron.
I brought up the emmerich planes because some of the people retailing them in the US have some goofy list of all of the "improvements" that they make over the stanley type, but they neglect to mention that the blade is crappy steel and the attachment for the primus adjuster is a pain in the pee pee, especially if it grabs tight on the end of the rod that retains it.
I can't comment on most of the very modern stuff (;like 55 degree frogs from lie nielsen), though I have used a 50 degree frog on a friend's plane before learning to use a cap iron, and in comparing our two identical planes planing hard maple (mine common pitch) we weren't very happy with the extra effort that we could notice trying to take a heavy shaving. Fortunately for him, building things in straight lines combined with a sander and a spiral headed planer has pretty much eliminated his use of planes.
The bailey design is exceptional. Modern low-cost versions of it are not.
Most of the planes over here after single iron planes went nearly extinct are common pitch. They're that pitch for a reason, because it is more effective with a double iron than is 50 or 55 degrees, but you can still use it as a single iron if you like. It works a much wider range.
The shame of it is that nobody is building a stanley bailey type plane that is similar in spec to a stanley bailey type plane built 100 years ago (including the good fine grained and not overhard iron).
I've bought a lot of vintage woodies with double irons, and some with single irons, the double iron planes are much more capable and except for two smoothers I had (one was craftsman made and senselessly bedded at 55 degrees with a double iron, the other was a modern sorby plane bedded at 50), the rest have been common pitch, including a bunch of other smoothers, but all of the try and jack planes have been common pitch. My lone remaining single iron jointer of good quality (as opposed to a later budget option - it's an early 1800s plane) is bedded at 50. It's unfortunate, as pretty as the plane is itself, it's out of its league (by a wide margin) vs. a common pitch double iron plane in every single planing task - except if a user doesn't know how to set a cap iron.
I brought up the emmerich planes because some of the people retailing them in the US have some goofy list of all of the "improvements" that they make over the stanley type, but they neglect to mention that the blade is crappy steel and the attachment for the primus adjuster is a pain in the pee pee, especially if it grabs tight on the end of the rod that retains it.
I can't comment on most of the very modern stuff (;like 55 degree frogs from lie nielsen), though I have used a 50 degree frog on a friend's plane before learning to use a cap iron, and in comparing our two identical planes planing hard maple (mine common pitch) we weren't very happy with the extra effort that we could notice trying to take a heavy shaving. Fortunately for him, building things in straight lines combined with a sander and a spiral headed planer has pretty much eliminated his use of planes.
The bailey design is exceptional. Modern low-cost versions of it are not.