I am an experienced road cyclist but new to tandems.
I purchased a used tandem a few months ago.
My stoker will be one of my 6 year old daughters. I am comfortable with the variety of ways I see to get the pedals up to her height.
They know how to ride a 2 wheel bike.
I have been taking the tandem out for some practice runs so I can get a feel for it before letting them on with me.
My question is how to get the rear bars far enough back so the kids can reach them? Are there different, very long stoker stems that you use, or a bar shape that I am not aware of?
I take my kids on an older Bike Friday tandem. I believe the current models use more standard stoker stems, but mine is a 2 piece system that uses a standard quill stem as one of the parts, which allows for some adjustability. It has been sufficient to use with the stock handlebars since my kids were about 4 or so. I don't know whether such a thing is available for purchase, but I believe there adjustable stoker stems out there.
Find an adjustable stoker stem where the male adjustable part measures 28.6mm, remove the male adjustable part and put it aside. Buy a cheap, long, 28.6 seatpost and cut the seatpost clamp off the top. Put the bottom of the seatpost into the female part of the adjustable stoker stem. Clamp a standard 1-1/8" (28.6mm) stem to the top of the cut-off seatpost, and add your child stoker bars. That's it.
For a quick change option, put adult stoker bars on the original male part of the stoker stem, then you can swap back and forth from the kid bars to the adult bars.
PS- you want the bars above the seat for a kid, maybe 3-4".