Boaty
HI Boaty
I have not built either of your models but the original Aerokits were designed for IC engines and performed well at speed. RC was in its early stages so the boats needed to be very stable rather than exact scale so your assumtion is spot on. Les Rowell the designer made very good kits for the period and his original models are still sought after by collectors and restorers. I have two Crash tenders, a Sea Queen and Solent lifeboat. Apart from the Solent I use brushless in all the models and the performance is just as the designer intended. 👍
There are reproductions based on the original designs and no doubt another member will advise if the PT boat is available.
Live long and prosper
Dave