What is the typical blade pitch angle of a ram air turbine?
Ram Air Turbines have variable pitch which is set according to demanded load and airspeed, and the controller keeps the rotational speed as high as possible for maximum efficiency. Typical operational RPM of a RAT is between 5500 and 7700 rpm, at speeds between 125 - 375 knots. Let's take the averages: 6600 RPM @ 250 knots = 700 rad/s @ 130 m/s.

At a disk diameter of 1 m and a spinner diameter of 20 cm, lets look at velocity triangles at the blade root, centre and tip:


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.


Note that these are unloaded velocity triangles, the blades can only generate power with air coming in at a local angle of attack. We're rough estimating, so you could take a pitch of 25 deg at tip, 35 at centre, and linearly twist onto 45 deg at root (most of the power is generated at the outer part of the blade).