Narai Mk IV Cruising Speeds?

[Allen Bosely]

Obviously it depends on the wind speed. But what speeds does a Narai Mk IV tend to get. In general I mean. She wil be Schooner rigged with Wharram Wingsails.

Speaking of masts & sails. Is the Narai Mk IV a bit under sailed or is the Schooner rigged Wingsails about as big as would want to go and keep the safety factor. 

Could she use a little more sail area by making the masts a bit taller to gain a some more sail area? Thinking about light wind in particular.

I have no idea about the Narai sail size, so not saying that it's under sailed and needs more. Just asking out of curiosity.

Cheers, Allen