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A ram air turbine power system includes a ram air turbine having a turbine shaft, turbine blades for rotating the turbine shaft; and an electrical generator or other power source device driven by a power shaft, for providing power. The power shaft has a generally hollow tubular shape, and the turbin

A ram air turbine power system includes a ram air turbine having a turbine shaft, turbine blades for rotating the turbine shaft; and an electrical generator or other power source device driven by a power shaft, for providing power. The power shaft has a generally hollow tubular shape, and the turbine shaft extends coaxially within the power shaft. The ram air turbine power system also includes a gearbox housing a planetary gear train, where one end of the gear train is a planetary sun gear spline coupled to the power shaft and the other end of the gear train is a planetary ring gear spline coupled to the turbine shaft so that the rotating turbine shaft drives the power shaft through the gear train increasing the speed of the power shaft over the speed of the turbine shaft.

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We claim: 1. A deployable ram air turbine power system comprising: a ram air turbine having a turbine shaft; a power shaft; and a gear train that transfers rotation from said turbine shaft to said power shaft, wherein said power shaft is part of a first power source device; and said gear train comp

We claim: 1. A deployable ram air turbine power system comprising: a ram air turbine having a turbine shaft; a power shaft; and a gear train that transfers rotation from said turbine shaft to said power shaft, wherein said power shaft is part of a first power source device; and said gear train comprises a gear train disposed forward of said first power source device. 2. The deployable ram air turbine power system of claim 1, wherein said gear train comprises a planetary gear train having a sun gear coupled to said power shaft. 3. The deployable ram air turbine power system of claim 1, wherein said gear train comprises a planetary gear train having a planetary ring gear coupled to said turbine shaft. 4. The deployable ram air turbine power system of claim 1, wherein said gear train comprises a planetary gear train disposed in-line to said turbine shaft. 5. The deployable ram air turbine power system of claim 1, wherein said gear train comprises a planetary gear train disposed in-line to said power shaft. 6. The deployable ram air turbine power system of claim 1, wherein said gear train comprises a planetary gear train disposed aft of said ram air turbine. 7. deployable ram air turbine power system comprising: a ram air turbine having a turbine shaft; a power source device; a power shaft coupled to said power source device; and a gear train that transfers rotation from said turbine shaft to said power shaft, wherein said power shaft is coupled to said power source device aft of said ram air turbine. 8. The deployable ram air turbine power system of claim 7, wherein said gear train comprises a planetary gear train disposed in-line to said turbine shaft. 9. The deployable ram air turbine power system of claim 7, wherein said gear train comprises a planetary gear train disposed in-line to said power shaft. 10. The deployable ram air turbine power system of claim 7, wherein said gear train comprises a planetary gear train disposed aft of said ram air turbine. 11. The deployable ram air turbine power system of claim 7, wherein said gear train comprises a planetary gear train having a sun gear coupled to said power shaft. 12. The deployable ram air turbine power system of claim 7, wherein said gear train comprises a planetary gear train having a planetary ring gear coupled to said turbine shaft.