OK, lets try something more specific.  Anyone with a Piantedosi rowing unit: can you tell me the measurement from the bottom of the monorail to the lowest point in the sliding seat?   I am just trying to match the seat level of my custom sliding seat to match the Piantedosi, since that is what the Annapolis Wherry was designed for.

Thanks in advance,

Scott

   I made one for a Dave Gentry Ruth rowing boat that I built. I think the Angus rig can probably be adapted to a lot of different boats. But you have to take care for proper placement and proper height of the sliding seat vis-a-vis the oarlocks. The folks at Angus are very helpful in case you have questions. The advantage of this rig, by the way, is that it's much lighter than a Piantedosi.

Thanks Overland,

I came to understand exactly what you were saying about the position of the rigger, sliding seat and heelcups relative to the waterline and each other.  Since the A. wherry was essentially designed for the Piantedosi, I was attempting to use the various dimensions and measurements for that rig to guide my construction.  I was able to get an answer from CLC staff about the height of the sliding seat above the monorail (2 and 5/8ths inches).   

Did you build the Skin-on-frame version or the wood version?  I was tempted to try the skin-on-frame next simply for the lightness of it.

   Yes, we did it on our build, fairly straightforward for adapt the design.  Our build log is here.

I added a couple of blocks under the riggers to lift them to the correct height.  You'll need to look for rowing geometry to get the measurements.