@hermank well I’m new to this forum so I may have screwed up being on the learning curve 🤣. It was thanking you for your kind offer of the plans, and to cover any shipping costs you may incur 😊.

MSJB a good evening
I haven’t noticed a PM
No problem there are no secrets
Regards
Herman

@hermank that is very kind of you 😊. I have sent sent you a PM.

MJSB a good afternoon
I have made the Perkasa and gave it to a friend including all the pictures, plans and booklet.I will see him on Sunday during our last event. I can sent you pictures of the wanted details early next week
If is that ok for you
Regards
Herman

Trim tabs are typically operated hydraulically Hard to tell for certain in your photo but those tabs appear to be fixed in their position.

Hey all, I’m building a 1/24 Brave Borderer from a Perkasa kit which is extremely basic for my ambitions, but I’ll be scratchbuilding and engineering a lot of it.

I wonder if anyone here can tell me anything I can’t find on t’internet about the transom mounted trim flap on these beauties? I can find plenty of low resolution photos, and a description of the angle to which they were set in different sea states, but I just can’t see how they operated mechanically.

There are three exhaust port covers, sometimes called transom flaps (because they’re flaps and on the transom I guess 🤦‍♂️), but those aren’t what I’m wondering about.

Then there’s a shelf below those with a compound curve underside.

Then there’s what looks to be a single, hinged trim tab or flap at the bottom of the transom, which appears to be the hydrodynamic control surface that trims the boat on the plane.

I can see two actuator rods between the shelf and the trim tab, but in different photos the shelf is at different angles, horizontal in this photo. What I don’t know is whether the shelf angle was fixed (what I suspect from the apparent construction) but varied at different periods or between different vessels, or whether this shelf was articulated up and down with the trim tab.

Oh, and judging by the position of the ensign staff holder and the prop handedness, this photo appears to have been mirrored.

Has anyone got any ideas how the trim flap was articulated? Or got any suggestions where I might find out more?