More on engine size

I found an interesting site: sizing the engines on a power boat.

While acknowledging that there are many models, some of which may be close, they have a simple diagram which I liked:

Speed-prediction-500x932

They have put their boat Platypus on it as an example. Note that the diagram and scales are for “high speed boats capable of planning”.

It is pretty good for the Ligure 50 as for 36,000lb, 135hp motors (note 2x) would give an estimate of about 11kn, which is about right.

135hp motors – 11kn
170hp motors – 15kn
250hp motors – 18kn
320hp motors – 20kn

Of course all of these are simply close guesses. A particular boat really needs some good analysis like Snodog did.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s