Freewing F14 Tomcat twin 80mm EDF build by 4stripes - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-07-2017, 08:42 PM   #1
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Freewing F14 Tomcat twin 80mm EDF build by 4stripes


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In fact this thread is kind of late as it was started over a year ago but I will post most of the relevant changes to the stock kit.
Here is a recent video thanks to a club member (Max).
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Old 09-07-2017, 10:19 PM   #2
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

The 80mm fans are well designed and sound pretty decent right out of the box but I did disassemble them and reassemble them using locktite on all screws. A drop of triflow oil was added to each bearing for longevity. The fan adapter is keyed to the motor so that there is little or no chance of it changing position. In order to dynamically balance it I placed small squares of duct tape (trial weight) on the spinner, trying all positions "around the clock". Once the trial weight was in the smoothest running position it told me that the opposite side was the heavy side. I then drilled away material from the fan until it ran smooth. This method of removing weight is much easier than adding weight to the light side of the fan as the fan does not need removal or loosening. The metal shroud had a rough edge on the lip near the fan so it was filed away to make smooth.
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Old 09-07-2017, 10:31 PM   #3
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

The ESC's are only 80 amps each and the motors draw close to that with a strong battery. They are mounted under the belly in channels with perforated covers for airflow in stock configuration. Lack of cooling and pushing them close to rated limits helped me decide to change their location to be exposed to the intake duct airflow and to add additional cooling fins from salvaged failed ESCs in my junk drawer. The alloy fins are simply glued to the metal plate on each ESC with JB weld which seems to hold well and transfer heat.

The stock sepate BEC turned out to have relatively weak voltage to power the radio when tested with a simple RX voltage tester so it was replaced with a YEP 20 amp BEC. Having lost too many jets due to weak BECs we were not taking any chances with this lovely model.
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Old 09-07-2017, 10:37 PM   #4
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

My father Chris was busy making numerous scale details and improving the cockpit. The original pilots were used but pretty much everything else inside the canopy was new fabricated from scratch. Bits of balsa, plastic, leather, wire, tubing, photos for instruments and paint are some of the materials used.
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Old 09-07-2017, 10:43 PM   #5
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

Exterior details like the arrest or hook needed fabricating as it seemed to be missing from the kit. Other odds and ends like the vents beside the canopy added and nonslip sandpaper added to the walkway.
The wing center section cover has several screw holes which we covered with plastic hatches held in each hole with a snug fitting balsa plug.
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Old 09-07-2017, 10:48 PM   #6
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

Battery cooling was a concern so some additional holes were made under the nose for intake and exit holes bored from the rear of the battery bay into each duct. Holes were cut using sharpened brass tubing.
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Old 09-07-2017, 10:56 PM   #7
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

The fan thrust exit area had some gaps where air could escape near the elevator servos and where the motor wires run so they were closed off with foam and plastic sheet.
In order to reposition the ESCs into the duct some extensions were fabricated to lengthen the motor wires.
I didn't like having the motors running off of separate batteries so I made a harness that puts the two 6S packs in parallel. This way equal voltage is supplied at all times to both motors keeping them in sync for better sound. The parallel connection has a built in 15 amp fuse just in case one side has some bad short or fault. One side could short completely and the other battery and fan will continue to run thanks to the fusible link.
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Last edited by 4stripes; 09-08-2017 at 12:22 AM.
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Old 09-07-2017, 10:59 PM   #8
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

This shot of the bays on the underside shows where the receiver, BEC and HobbyEagle gyro are mounted. You can also see where the ESCs are under the cheater intakes with the cooling fins inside each intake duct.
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Old 09-07-2017, 11:07 PM   #9
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

Great care must be taken when assembling the wing sweep linkages as the actuators are very powerful. Powerful enough to rip the linkage attachments from the wing or bend the metal "servo" arms. Our wing servos had more travel than the wing would sweep by just a hair so some plastic was filed from each wing where it would come in contact with the spar system. Don't connect the linkage and then try a wing sweep as the results could be disasterous. Only once free and full travel is assured can the linkages be safely screwed solid.
These sweep servos are not proportional and end point adjustment is futile. They go full travel each way and can not be stopped part way like a regular servo. Proportional sweep servos would have been nice so that partial sweep could be selected but that is not the case.
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Old 09-07-2017, 11:19 PM   #10
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Re: Freewing F14 Tomcat twin 80mm EDF build by 4stripes

The original stock main wheels are the best quality wheels I have seen to date with actual ball bearings! The trouble is with no friction this jet will roll right off the end of the paved runway so Lander (aka Dr Mad Thrust) electric wheel brakes were fitted. They fit without much trouble and work surprisingly well. So well that the rubber wears pretty quickly off the tires and retreads were made from bicycle inner tubing. The amount of braking can be limited using end point adjustment on the radio but even at the lowest setting the braking is fairly strong. We use a tiny 180mah 3S pack to power the brake controller. It is only at storage charge but has lasted many flights without any need for recharging. It must be disconnected once the flight is over or it applies brakes once the radio is powered down. In hindsight we could have powered it directly from the flight battery like on our SU47. Perhaps we may do this in the future...
The long gear legs give a lot of leverage to damage the retract mounts should the plane hit the grass or a rut so we added fishing line to limit the rearward movement. All the legs retract forward and extend aft so the lines provide tension in the right direction.
Plastic plates were added beside the wheel wells to cover the exposed wheel when retracted. In stock form the alloy wheel is quite visible on a flyby but now the wheels are no where to be seen.
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Last edited by 4stripes; 09-08-2017 at 12:26 AM.
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