HI Dave, Thanks for the reply. I'm more interested in the stern section of the original boat, eg how the tubes are held, if they are faired in,and if the original keel has to be extended to the stern as other twins. Although I would like to see my boat "flying" I'm more interested in the scale effect and keeping with the prototype design. Has anyone seen a picture of the underside of the real boat ??? At the moment it's all guesswork. Thanks again Bill.

HI Billy
Welcome to the site. Had a quick look through the power setups on the site and 34" Fireboats with twin props are a bit thin on the ground. I did see a 34" MTB with twin props and 600 Graupners driving 35mm props. if you look in power setups you will find the details. I suggest you try sending a personal email to the builder as the details will be pretty similar and you may be able to get some pics of the props set up on the model. 👍
With the restricted space in a 34" Fireboat you will probably have to choose and position the motors then align the shafts allowing for the chosen props and twin rudders. I think a flat carboard sheet the shape of the inside of the hull would be a good starting point. You can then align everything and when satisfied transfer the relevant holes to the wooden hull. Weight is going to be a problem so you need to plan where your receiver, ESC(s) and battery(ies) will also fit. A floatation test with all the bits loose in the hull will help get matters right. 👍
I have a 34" Fireboat with a single brushless motor. My motor is slowed right down using exponential control on my transmitter and the model still tries to take off unless I am very careful.
Good luck with the restoration and please ask if you need any more help. 😀