Flattie DRAG BOAT Top Speeds...

[Sharp shooter]

Can a legal drag/circle flat have ANY keel OR gull at all?

Yes

IS a TRUE flat just what the name implies?

Sometimes. Some true flats have a tiny amount of V and some don't and some true flats have dropped chines.

What are the rules for CIRCLE and for DRAG ?

You're crazy if you think I'm gonna list all the rules.YOU can look that up. Circle bottom rules are on line. Drag boat rules might be too, but I don't really know.

When you look at KILO records for this hull type and top speeds from back in the day with FUEL boats it leads me to believe that there is a limit but that is just my simple and UNexperienced view.

Are there more variations/changes that can be made to make them safe at 180 and up like additional bottom refinement/wind tunnel testing/wings/capsule shape/weight/balance?

Your guess is as good as mine.

At this point, 40-50 years later, have all of the LEGAL ENHANCEMENTS to the bottom been tried at this point?

I couldn't say...

Are there chine differences that are legal/not legal helpful somehow in high speed stability?

I have no idea...

Hope this helps.