EZFW-Programm - FEMA Modelltechnik

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Retractable undercarriages The undercarriages are available in four sizes For models of the scale 2.0-2.8 for wheel diameter of 165, 152 and 140 mm, ........... stock number 9800A. For models of the scale 2.5-3.2 for a wheel diameter of 127 or 112mm, ...................... stock number 9810A. For models of the scale 3.3-3.7 for a wheel diameter of 100 or 90mm, ........................ stock number 9820A. For models of the scale 3.8-4.8 for a wheel diameter of 72 or 80mm, ............................ stock number 9830. Super retractable undercarriage for the 4m class. Stock number 9830A for model airplanes of a scale between 3,8-4,5 now with solid tires of a wheel diameter of 82 and 70mm. Options: available with wheel brake and in a spring-loaded version. A retractable undercarriage is essential for scale and semi-scale models. The “FEMA retractable undercarriages” are being used successfully for years and have demonstrated their ability in fl ight practice. Mr Gardemin wrote in his test report about retractable undercarriages: »FEMA retractable undercarriages are without any technical paraphernalia but they are designed 100% functional and sturdy.« We still feel obliged to this statement, now and in future. The new generation of FEMA retractable undercarriages for large sail-planes is a logical development of the proven undercarriages which we have been producing since 1988. The retractable undercarriages are designed modularly and thus can be adapted perfectly to different conditions. The undercarriages can be installed either fi rmly between two fuselage bulkheads or spring-loaded. If they are used together with FEMA solid tires, these retractable undercarriages withstand even extreme strains. The infl exible mounting between two bulkheads of the fuselage is perfect for standard models. It is advisable to use spring-loaded carriages for really soft touch-downs. The gas pressure spring makes the best possible damping even on the roughest runways. The damping can be adjusted to the weight of the model by three damping variations all of them available for immediate delivery. The required springiness of the gas pressure spring can be calculated as follows: springiness (N)=model weight in kg x 40 (1kg~t10N) Gas pressure springs are available with a springiness of 200N, 300N, 400N. Models of more than 10kg require the attachment of 2 springs, more than 20kg require the attachment of three springs. We have made the mounting of the springloaded version considerably easier and also made room for the attachment of the moulded seat. The additional kit for spring-loaded mounting includes two stable aluminium angles with borings for the mounting. They are attached to the fuselage bulkhead with the same screws as the retractable undercarriage. This makes it possible to prepare the fuselage bulkhead as shown in the illustration and you obtain enough room for building in the moulded seat. For the safety of your model, we recommend the attachment of a wheel brake independently of whether the undercarriage is attached fi rmly or spring-loaded. The wheel brake is operated by a servo and it can be applied extremely sensible though its high brake power. If the retractable undercarriage is attached fi rmly, the brake-servo can be mounted on the front fasteningbulkhead or directly on the chassis of the undercarriage.
Retractable undercarriages If it is attached spring-loaded, the brake-servo has to be attached to the chassis of the undercarriage in order to ensure the safely functioning of the wheel brake when the retractable undercarriage is spring defl ected. If the brakeservo is attached to the chassis of the undercarriage, an additional reversing lever (stock number 9890/22) is necessary. The retractable undercarriages have the following outstanding features: ● Reliable functions - Bolt mechanisms on both fi nal positions. ● Highly effi cient wheel brake - safety for model and operator. ● Spring-loaded installation - for really soft touch-downs. ● Robust attachment in the fuselage - between two plywood bulkheads. ● Installation height in the fuselage is relatively variable . ● Installation of 1 to 4 servos is easily possible in connection with the servo holder (landing gear rudder, vertical rudder and elevator rudder) ● The wheel frame made out of spring steel ensures a safe function of the ventral fl aps. ● A detailed instruction manual makes the installation as easy as possible. With these retractable undercarriages, we set new standards concerning quality, modularity and price. We are looking forward to equipping your sail plane with a FEMA-retractable undercarriage. Degree picture: masses in mm hanger servo-holder Part number A B C D E F Weight* Model-weight 9800A 272 80 68 140 - 165 66 92 680 g 12 - 25 kg 9810A 220 72 60 110 - 127 56 68 420 g 8 - 16 kg 9820A 196 62 50 90 - 100 46 60 350 g 5 - 10 kg 9830A 172 54 44 70 -80 36 54 200 g 3 - 7 kg *without wheel, servo-holder and wheelbow
Page 1: EZFW-Programm ● FEMA-Retractable

EZFW-Programm - FEMA Modelltechnik

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