Stubby Oona spout flow diagram
The water stream is fairly well behaved in the 0-2.5 GPM range. The water stream's position does not change significantly as the flows change.
Beyond 2.5 GPM the water stream deforms a bit as water touches the baffle as it exits
After 3 GPM the water begins to interact with the baffle and deform the water stream rather severely
Spout was plumbed with ¾ in. pipe using supplied slip connection.