36% 106" Katana - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-27-2010, 03:44 PM   #1
Terrence Allen
RCC Junior Contributor
I am: Terrence Allen
Join Date: Sep 2007
Location: North York, Ontario
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# of RCs: 24

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36% 106" Katana

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• Now, we get to the most advanced (and largest) model I have to describe. It’s a 106” span (36%) sport scale model of the ‘Katana’…well known in aerobatic circles. This ARF came originally from California-based Airborne Models and was manufactured by World Models. Construction of the fuselage and tail group is conventional balsa/ply with balsa-covered, molded foam turtle deck. Wing panels are balsa covered foam cores and the whole affair is film covered with the exception of course of the fiberglass cowl. Powering this model is a Fuji Imac model BT-86EI currently swinging a 24/10 wood prop. This is a twin cylinder, horizontally-opposed ‘boxer’ design with Walbro pump carburetor and a stamped steel muffler with six exhaust stacks. The “EI” in the model designation refers to ‘electronic ignition’ and a portion of its function is to advance or retard the ignition timing to improve starting ease without having to compromise on optimum advanced timing for the top end performance. Thus far, it has shown itself easy to start with a low, reliable idle and smooth transition through the midrange on up to full throttle. Access to the manually-operated choke (as well as the high and low speed needles) is through the lower front of the cowl. A total of nine servos are used with two each on each wing panel, the elevators, the rudder and one on the throttle. The four aileron servos and two elevator servos are Futaba while the two rudder units are Hitec and all are high speed, high torque units with digital amplifiers supplying power to coreless motors driving dual ball bearing-supported, all metal gear trains. The ninth, on the throttle, is an analogue ball bearing Futaba servo. While most would likely opt for 2.4 GHz transmission technology in such a model, both PCM and FM receivers are also usable without concern for interference from either the engine’s ignition module or the abnormally long servo extension leads. This is accomplished by the use of fibre optic servo extensions used on the two outboard aileron servos, the four mounted in the tail grouping plus one more for the throttle servo (as it is mounted in close proximity to the ignition module). These devices (five in total) comprise both an encoder unit which converts the electrical receiver signal to an infrared light signal which is then routed through fibre optic cable to the decoder unit adjacent to the servo which converts the light signal back into an electrical signal and presents it to the servo. Power for each servo is supplied directly by the decoder module which connects directly to the batteries thus bypassing the receiver bus. The four aileron servos are connected also through a Futaba four channel servo synchronizer for ease of adjusting. Power for all on-board avionics (including the engine ignition module) is supplied by a pair of 2s1p, 2200MaH lithium polymer packs. A pair of high current, linear regulators are incorporated (diode-isolated from each other) and switched with shorting plugs to eliminate the need for external switches. These regulators feature a switchable five or six volt output and also an externally-mounted LED that flashes different colours should the supply voltage fall to a critical level. The only externally-mounted switch serves the ignition module. Please note that this redundant power supply system was installed after the pictures were taken and so does not appear in any. Fueling is through a Great Planes gas ‘Easy Fueler Valve’. I have flown the model for one single flight only towards the end of last year’s flying season (my knees finally quit shaking only recently) and it seemed rock solid in the air and this is precisely what one would expect from such a model… purpose-designed and built for precision aerobatics. Please…only serious enquiries. The listing price for this package is $1745. I am listing several prepared radio controlled fixed and rotary wing (helicopter) models on this site suggesting sell process that I feel are fair. If the interest is sincere, I will negotiate fairly such that, if common ground can be found, both parties come away from the consummated transaction feeling they’ve been treated that way. Realistically, I know I can not expect to recover anywhere near the original cost of each but, that said, I will not entertain even for a moment offers that I deem as entirely unrealistic and motivated by pure opportunism.

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Last edited by Terrence Allen; 08-13-2010 at 07:07 PM. Reason: Deleted...re-listed at reduced price
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