Question

If a seaplane has velocity at stall as V mph then, what will be the value of deadrise angle?

(a) ɑdeadrise = 0.5*(v – 20) degree

(b) ɑdeadrise = 0.5*(v / 20) degree

(c) ɑdeadrise = 0.5*v degree

(d) ɑdeadrise = 0.5*(v^2 – 20) degree

This question was addressed to me during an interview.

I'd like to ask this question from Landing Gear and Subsystems topic in section Landing Gear and Subsystems of Aircraft Design

Answer 1

Correct choice is (a) ɑdeadrise = 0.5*(v – 20) degree

The explanation is: When we use V shaped bottom on seaplane, deadrise is then defined as the height of the V and angle is called deadrise angle. Typically, deadrise angle can be approximated as follows, ɑdeadrise = 0.5*(v – 20) degree where, v is stall speed in mph.