Thanks Jacques and Matt for both your explanation regarding the efficiency of the C21 hull for my plans of use.
I appreciate both your efforts and totally understand what you mean.
Your absolutely right, for my plans of use other hulls might be more full efficient.
With this Onedin 650 I had a great time this summer:
A (semi?) planning hull (totally not sure about that and absolutely not trying to be wise) with 9.9 hp 4-stroke high trust Yamaha.
900 kg displacement and max. 60 hp as specified by designer. More than enough room to sleep for two adults and a child and a lot of fun for low fuel costs.
Just for fun, here on YouTube you can see an Onedin 650 on plane with a Honda BF45, the hull is original but she is (too) heavy modified:
I really like the CX style above others and I'm sure I can get at least the same satisfaction as I got with the Onedin 650 (sold).
Of course they are two different boats, the Onedin is ugly compared by the CX, and... both hulls do have the same length but the C21 has 30 cm more beam then the Onedin and will be more stable. And I understand the wider beam makes the C21 less fuel efficient. Am I right?
When my boat will be finished I'll see how much Hp she will need to satisfy my boating style. I have no worries about that.
I'm sure about this build. I don't mind I will have less fuel efficiency or a slow boat as long as I have the boat that has the looks, size and comfort I want and need. I'm sure the CX21 has it for me!
I know, I'm stupid!