Thanks for your kind comment, coming from a professional designer !
I was not aware of your production that I discover through this thread, your CIY 16 looks great and well adapted for a broad programme.
For my Dolfi R&S, the average deadrise is ~ 70° at bow section regularly decreasing to ~ 11° at midship and reincreasing to ~ 22° at transom, associated with an accentuated round bilge close above the waterline to favor the dynamic stability.
Some comments about my guidelines and choices :
** For the rowing performance, my rationale was to consider that an average rower can sustained during one hour or more a speed of about Froude 0,30 (on calm water no wind,here for Lw 4,35 m >> ~ 3,8 Knots). For that kind of speed, a prismatic coefficient Cp 0,52 is optimal, no need to search for more Cp, that helps to have less wetted surface and finer water entry.
** The delicate point is the trade offrowing versus sailing : it is an hybrid programme with the risk of poor performance for both functions, and which can be resumed mostly by the beams issue :
** For Dolfi R&S, a 15,7' with Beam at sheer 1,34 m and Beam at waterline Bwl 1,03 m (for the designdisplacement 191 kg = boat fully equiped 91 kg + sailor 80 kg + itsroaming equipment 20 kg), I think we are on the rowing side of the programme.
** With about 15% more Beam at sheer (let say Beam ~ 1,55m) and at Bwl (let'say ~ 1,18 m), then I think we are on the sailing side of the programme.
** Both extra beams are important for the sailing programme :
Bwl is important for the intrinsic stability : when sailing, the sailor is not always sit low in the boat as a rower, you need to give him a more stable platform.
Beam at sheer contributes to give him more righting moment when heeling under sails, and dynamic stability during tacking or gybing.
Dolfi R&S waterlines :
Waterlines.jpg