You can fill a 500 page book with that !

The number of factors involved won't allow it to be fully discussed in just a few posts.

In danger of repeating myself I would like to repeat a newer version of the basic question

Why does a 122 kg M20 with 150 kg crew on board suffer from lack of momentum while a 135 kg Prindle 16 with 150 kg crew on board doesn't ? This is considered a lightweight baot the latter a normal weight boat. The momentum difference between both is less than 5 %.

(This included the new PRODUCTION version weight of the M20 which has been determine by Texel committee in 2003)

Indeed we can now expand the question to why this difference is felt, but that may involve many many pages filled with text.

Wouter