Oona spout flow diagram
At .75 GPM and 1 GPM the flow out of the spout appears too small in relation to the size of the spout.
Between 2-5 GPM the stream is fairly laminar and holds togeteher well the entire measured distance.
The spout can handle a considerable volume of water. Moving more that 5 GPM should not be a problem. Retaining a smooth flow then becomes a function of the plumbing and having a smooth flow in the supply line
Spout was plumbed with 1¼ in pipe for all tests. Please be careful when using smaller pipe sizes as the this will change profile.