1. This is a jet aircraft, designed and developed as far as it got in response to a Navy request that must have been one of many in the fever for air supremacy with them new turbine engines.
2. More than 10 were made.
3. A classic case of a design foiled by the poor performance of early turbines, outdated by the time it was developed
4. Single engine, and I doubt it floated. (But the Seamaster is way cool)