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There was no "X-" series as such. There was a model number series, and the X- prefix was sometimes added, sometimes not.Where did you find the X-110, X-225 and X-400 designations? Here's what I have:90: submission to the AAFSS requirementX-100 Hummingbird: experimental VTOL using wing-tip tilt-propellersX-200T Tandem: acquired by USAF as the X-19A200: planned commercial version201: no data (see below)203: Light Utility Transport project205: USAF transport and rescue VTOL, an enlarged Model X-200207-8: Multi-Mission Support Transport; much enlarged derivative of Model X-200 for Army260-7: Multi-Mission (RVX) Aircraft Design (also found "M-260 Recovery Vehicle")X-300: Local Service VTOL Transport — a proposed radial lift transport with two push-pull propellers on each sideX-325: no data (see below)X-410: huge tilt-rotor VTOL transport with 12,740-15,000 lb. payload, four engines and 23' propsX-425 Light Transport (LT-1): light military VTOL Logistic Transport project, basically an enlarged version of the Model 200; 32 passengers, 3600 kg of freight, rear loading ramp; four 2200 to 3000 hp turbines500: no data (see below)Mention of Models 201, 325 and 500:Source: Francis H. Dean, The Curtiss X Planes
There was no "X-" series as such. There was a model number series, and the X- prefix was sometimes added, sometimes not.
Where did you find the X-110, X-225 and X-400 designations? Here's what I have:
Mention of Models 201, 325 and 500:
Source: Francis H. Dean, The Curtiss X Planes
