From graham butler:
I have attached pictures of the seat with the 3 angles that we talked about.
Conclusion: sitting on it 110 is definitely a nice low rider position. With this particular handcycle I end up too far from the cranks.I definitely want to be more upright for high rider. 90 is too upright, but I think that 95 will be quite comfortable for high rider. It feels upright enough to be good for interacting with people.