Pete Brady calls it "Displanning" this hull form runs very efficiently in the displacement mode, but has enough area aft, fine entry and low drag sections with consequent low wave making drag to lift get on top with very low horsepower, it however has a limited top speed compared to a full on planning hull design. The Manta at 44 ft. runs very efficient at 8-8.5 knots (displacement) and 15-18 knots (semi-displacement or planning), but is in the not efficient pre-lift off hole, at 10-13 knots. If it were longer with same beam it would be more efficient in the 9-10 knot range in the displacement mode. These numbers of course could vary slightly based on overall weight and to a lesser degree bridgedeck clearance.