Though similar in design to the Sonnet 17.5, the Sonnet Double is longer, wider and taller, and uses larger diameter sponsons ( 4.75" vs 4.25"). The following link provides instructions for making PVC sponsons. Use the (BACK) key to return.

NOTE: Since homebuilt sponsons are critical to successfully completing the Sonnet 17.5 and Sonnet Double I recommend that builders first make small "test" sponsons to perfect the technique before starting construction of these boats. Contact me if you are having difficulties.