I'm looking at a first 4-stroke build on a Sun Atlas with Shimano coaster brake on the rear. I thought I would add a Sturmey Archer drum to the front wheel. This combo should be adequate for a conservative (gray-haired) rider, right?
I have no idea what you mean by that. I run discs on all my bikes as do many others. Never had one "lock up".They dont lock up like a disc brake, but with a front drum and rear coaster (which is also a form of drum brake) you should be fine.
I'm running the same brakes you want, on my bike. For me they offer plenty of stopping power.I'm looking at a first 4-stroke build on a Sun Atlas with Shimano coaster brake on the rear. I thought I would add a Sturmey Archer drum to the front wheel. This combo should be adequate for a conservative (gray-haired) rider, right?