Hello and welcome to the Forum.
A lot of very knowledgable people on here.
Don't be afraid to ask anything, but before you do use the search function
As your answer might be there.
The Tamar is a lovely model.
For brushed motors
Dave at Action recommended
Action 755/775 12000rpm version
With action esc's, The component shop.
I agree with Flack
Overlander 3548/05 900kv Kings lynn model shop
On lipo or nimh
Hawk esc's 60amp Cornwall model boats.
Bow thruster, Jackie at Ms recommended
Raboesch 16/19
Available from model boat bits>Steve
Whilst your looking at it online, check out the couplings Steve has
Reasonable price and does the Job.
Protean Design/ Simon Higgins for props 40mm
5 blade contra rotating. But apparently on the model 4 bladed is the way to go.