Originally Posted by jeffstevens763@g
it would give drag as the hull wouldnt pierce the waves
Depending on the size, the size of the delta / planing pad may decrease wave-piercing performance, and increase pounding if not properly designed (oversized). The boat tends to slam and stop on the flat section, rather than gracefully cut and glide until displacement takes over.
This is why the early generation Avon Adventure 560 rides poorly in rough conditions. If you examine the Searider vs the Adventure, you can see the size of the delta was substantially increased on the rear 1/3 of the hull. It gives amazing planing performance, but at a loss of comfort in rough conditions.
If you look at the hull of the Zodiac Hurricane 733, you'll see it barely has any planing pad to speak of.
Jet drives are another animal entirely, they usually have a rounded section towards the stern in order to boost pump performance.