My model aeronautics knowledge is also pretty limited!
I switched to model boats after my first two attempts (from Kiel-craft kits) ended as matchwood and my third attempt, own design glider cut from 3 planks of 36x4x1/4 inch balsa flew so well that on it's maiden flight it caught a thermal off Hemswell Cliff in Lincolnshire and spiralled higher and higher and higher until it disappeared in the direction of Denmark or Norway☹️ Often wonder where it came down!
After that, early sixties, I started building my 1/72 H class destroyer HMS Hotspur. Scaled up from the 1/600 Airfix kit!
One of the flying boats is a PBY Catalina, ca 1,5m wingspan.
Paul, pm_devlin, here on the site put me on to the Cat model some time ago.
He has posted some vids of his flying on the site, under the title of 'not quite a boat' or summat like that!
The other is a kind of fantasy model you can either drive as a boat or fit wings, ca 1m span, and fly it, if you have the bottle to try!
Both are of polystyrene foam construction and feather light, that in itself worries me re stability in anything more than a balmy breeze😮
I'll dig out some pics and details tomorrow, er ... later today!
Cheers, Doug 😎