HrMs O-13 by FreekS - 1:50 - RADIO - 1931-1940 - Last Dutch Sub “on eternal patrol”

[FreekS]

Piets O-19 was very nice. We exchanged some details drawings at the time - I was building O-1. I’ve not heard from him in a long time ….

[amateur]

It’s 5 years ago Piet lastvisited MSW.

If he is still around, he turned 91 last week.

 

Jan

[GrandpaPhil]

Very cool build!

[FreekS]

I’ve made the first international trip with O-13, to Nürnberg in South of Germany where there was a big submarine meet in a pool. Hung a GoPro over the Edge  of the basin and spend two days sailing. 
 

Done quite a lot of optimising ballast, tweaking the movement of the front diveplanes and much more. Also replaced the props with nylon/carbon 3D printed ones with much smaller pitch, to sail slowly enough at periscope depth. And found room to install an automatic leveler. Now the boat is near stable at periscope depth with the rear planes being controlled by the leveler and both front and rear planes also by the transmitter.

 

Edited May 30 by FreekS

[ccoyle]

Looks like O-13 might be hunting a Skipjack-class sub there.

[Jim Lad]

She looks splendid underwater.

 

John

[FreekS]

On 5/31/2025 at 1:04 AM, ccoyle said:

Looks like O-13 might be hunting a Skipjack-class sub there.

Both boats in this pic operate close to their scaled max depth, for O-13 around 60 meter (one boat length) and skipjack likely over 200m. It’s also amazing to realise “only” 25 years separate building these two subs!