UNDERSTANDING THE PHYSICS OF TRIM

Thrust deductionShould be as low as possible in order to gain on the hull efficiency!Function of the propeller thrust (T) and the hull resistance.t=T− RTTThrust deduction0.180.160.14Fn=0.128Fn=0.164Fn=0.201Results for Froude number = 0.128Trim -2.0m 0.0m 2.0mt [-] 0.166 0.145 0.147Δt [%] 14.9% 0.0% 1.7%ΔP D t [%] 2.5% 0.0% 0.3%0.12Trim (m)0.1-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2