Scaling up a design

[AnJo888]

Hello fellows.

I've just got a dinghy project I intend to build as my first one.

The boat is about 1.7 m (5.5') long and I want to "stretch" it a little.

I intend to use an 1.25 scaling factor.

My question is:

Is it ok to apply a constant multiplier to all length mesures, or do I have to consider any other values, due to curved surface? Furthermore, should I use a ticker plywood (let´s say 6mm instead of 4mm) to ensure more resistant longer surfaces?

Thank you for your attention and support.

[mmd]

There are things to consider beyond merely length factors when considering "stretching" a design. In most cases, it is not reccommended to lengthen a design by more than 10%. In the case of a simple ply dinghy, and especially with your first boatbuilding project, why not just get a set of plans for a 2.15m dink? There are plenty of them available, and you won't run into any surprises during construction.

[AnJo888]

I think you're right.
I've got that feeling, in the back of my head, that it was not as simples as multipling the lengths.
Anyway, it is great to be a new member of this forum.
Thank you for attention and prompt response.