Really grateful for everyone taking the trouble to respond.
So to summarise so i have this clear in my head some people do use a longshaft on their SIB but this does result in lower top end and unwanted splash black due to the hight of the prop. Does the long shaft also affect handling/stability assume the SIB may wheelie greater with the longshaft. Once on the plane would there be any adverse handling apart from a load of water spraying over the transom?
With regards to using a <3m SIB I have read which surprised me (but I am a newbie) that the shorter the SIB can result in it taking longer to get on the plane? As I have a bigger boat I liked the idea of something small will the 9.8 have problems getting a <3m on the plane with 1 or 2 people? 24stone combined and yes I am carrying a bit of timber at the moment!
Again responses greatly received