under the marketing name Omni-Vision, following the pattern already set by other Cessna models. The new rear window improved rearward visibility, and many people found the new cabin more "airy" and pleasant, due to the increased light. The baggage compartment was also enlarged, and the weight allowance for baggage was increased from to . The gross weight of the aircraft was correspondingly increased to , where it would stay for all later 150 models. Because of the higher gross weight with the same engine power, Cessna's claimed performance figures for the 150D and later models are worse than for earlier models: maximum and cruise speeds are reduced, range is shortened, takeoff and landing distances are lengthened, and climb rate and service ceiling are lower. Such changes are only to be expected, because performance is weight-dependent and is normally specified at maximum gross weight. Cruise performance may also have been lessened because the new rear window made the 150D's rear fuselage less well streamlined than the former "fastback" fuselage. The 150D retained the straight tailfin and rudder of previous years. However, to lighten control loads, aerodynamic balance horns were added to the rudder and the elevator. These horns also contained weights (mass balances) to eliminate any possible control flutter that might be induced by the changed aerodynamics of the rear fuselage. The 150D moved the heavy electrical battery from the previous rear location, behind the baggage compartment, to the front, just ahead of the engine firewall. It had a broader range for its center of gravity than earlier models, which allowed more flexibility in loading. The 150D also had more permissive airspeed limits for its never-exceed speed, its maneuvering speed, and particularly its maximum flaps-extended speed, which was raised from to . Partway through the 150D's production, an option was added for a heavy-duty nose landing gear with a larger 6.00×6 inch (150×150 mm) nosewheel; this had a tire whose tread was wider than standard but was only slightly larger in diameter. The folding torque links on this heavy-duty nose gear were also reversed, being mounted in front of the nosewheel strut instead of behind it. 804 150Ds were built. 150E The 1965 Cessna 150E saw only minor changes, like the addition of an optional rear-view mirror. The "E" model saw production increase to 1637 aircraft. 150F The 1966 model, the 150F, was greatly changed from previous versions, most obviously in