Hi Tim,

It seemed to me the original poster was working from a line drawing of some type. Don't know if it is the same as what you are using though. One thing I did notice though is the issue of the curves not matching up. Moreover, they were off by quite a bit in some places. It looks like he digitally traced them and got some really funky results. In places where you would have a line, a radius, and another line, it was just one huge curve. You couldn't make it like that if you wanted to using normal tools. So I have to believe it was some sort of conversion. Other places where a fillet would be logical was not a fillet. But some sort of curve. That is why I was saying the profiles were not quite right and needed fixing. But other more advanced forum users where able to work with them.

I have to agree with you though, I can't imagine this is very accurate. I know with propellers I'm extremely accurate with the points and curves. To get the right aero performance. What you are saying makes me think you are doing the same to get the right marine performance. I'm not sure what the original poster's intent was. However, most of the people that post here aren't worried about engineering. There methods are advanced in terms of modeling technique but terrible from an engineering point of view. Burman brought this up years ago and got his head ripped off. He's since disappeared from here mostly, which is a shame.

I have found that most of the questions on the forum relate to a lack of understanding of the real world. If you use Rhino and MoI like you would build something in the real world, there isn't many questions you run into. Most of the people here are coming from Poly modeling though.

Anthony