# What is the typical blade pitch angle of a ram air turbine?

I'm building a simple 3d model of one and because reasons I won't be able to give it a variable blade pitch so I need to find a typical value. My google-fu has failed me so far on this.

• A Radial air turbine? A radial turbine in a turboshaft, or a propeller-like Ram Air Turbine such as deployed by the A320 if all power fails? – Koyovis Aug 10 '17 at 3:42
• @Koyovis sorry meant to say ram air turbine – Aidan Aug 10 '17 at 4:15

• Blade root: R = 0.1 m, rotational speed $V_{rot}$ = 0.1 * 700 = 70 m/s. With incoming air at 130 m/s, this creates a local velocity pitch angle of arctan (130/70) = 62 deg
• Blade centre: R = 0.3, $V_{rot}$ = 0.3 * 700 = 210 m/s, velocity pitch angle = arctan (130/210) = 32 deg.
• Blade tip: R = 0.5, $V_{rot}$ = 0.5 * 700 = 350 m/s, velocity pitch angle = arctan (130/350) = 20 deg.