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Jul 26, 2017, 11:15 AM
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High_Start's Avatar
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RCM Funster 20 parkflyer project


Hello fellow balsa builders,

After giving away my Piper Super Cub parkflyer as a gift to my dad, I want to build a new parkflyer. Should be about 90 cm wingspan and full house control. The tailwheel wasn't a big succes on our small runway so needs to be a trike as well, and in addition, it should look and fly decent... After browsing the web and outerzone in particular, my eye fell on the RCM Funster 20 by Dick Tichenor, and it seems perfect!
Reduced to 58%, it gives me a wingspan of 35,09 inches or a little over 89 cm. I liked the park 250 motor for this size airplane, but I managed to break a lot of shafts and the mounting is a little goofy. Instead, powerplant will be a park 300 motor, with a 7x4 prop and a 2S 1000mah lipo, should be more that enough. I might even prop down to a 6,5x3,5 if it turns out to be too much for this little airframe. This one flies on the wing, not the prop. I won't build it with flaps, but like the Piper, it will get lights. I've already got the plans printed, so next step is to cut myself a kit. I already changed to fin outline to my taste, I know, heresy... Looking forward!
Last edited by High_Start; Jul 26, 2017 at 04:33 PM.
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Jul 26, 2017, 01:41 PM
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I am not a real electric guy, but think a 280 is not anywhere near the power of a .20 glow. Maybe if you build light.
Jul 26, 2017, 01:47 PM
AndyKunz's Avatar
He's building it at 56% so it should be just fine.

Andy
Jul 26, 2017, 04:33 PM
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High_Start's Avatar
For a full size Funster 20 spanning 60,5 inches, a park 300 would be way underpowered, but like Andy said, this one will be just a mere 35 inches wingspan. Nice parkflyer size. I've spotted a typo in the first post, it will be build at 58%.
Jul 27, 2017, 10:25 AM
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Ok, I thought 36" span was pretty small for a .20. Should GLH that way.
Nov 09, 2017, 01:44 AM
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So after a very busy period at work, I have finally started working on the little Funster. The fin and stab went togeather very easily, I really like the fact that the stab is airfoiled, should fly nice and allow for the CG to be quite rearward. Wing framing has started as well, and it goes together nice and easy. I got myself a set of permagrid needle files, and oh my, they make balsa feel like butter, how could I have ever build without them? Good tools are sure worth their money.
Last edited by High_Start; Nov 09, 2017 at 02:14 AM.
Mar 13, 2018, 11:12 AM
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Way too much time has gone by without stuff being done on the little Funster, but I am finally back on the project.
I had to spend a lot of time getting promoted at the job, and I want to do it properly of couse.
Anyway, the fuselage is coming together pretty well, the wing mount is pretty much done and it is basically starting to look like an airplane.
Putting the components roughly where they should be indicated a pretty nose heavy situation... which got me thinking of downsizing the
motor after all. Maybe I should put in the venerable Park 250 instead, which would save quite some weight, and I think it has enough power as well.
Mar 13, 2018, 12:12 PM
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So I just weighed the Park 300 and the Park 250 motor, and the weight saving is apporx. 13g, which doesn't sound like a lot, but being at the extreme end of the plane it will make the difference between nose heavy corrected with lead, or almost no lead at all. I just orderd the new motor and I need to figure out a way to make this one fit, probably need to change the existing motor mount.
Mar 14, 2018, 02:05 PM
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Today I got some more stuff done on the Funster, changed the nose section to fit the smaller motor, and got a lot of balsa glued on, which promises some sanding, but hey, that is the only way to get a nice looking flying machine.
Mar 15, 2018, 11:39 AM
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Facinating what sanding paper and a little effort can do to square shapes.
Last edited by High_Start; Mar 15, 2018 at 12:11 PM.
Mar 30, 2018, 10:39 AM
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Yesterday I got the replacement powerplant in the mail, according to the watt meter it puts out just short of a whopping 40 watts, while pulling almost 5 A and turning a APC 7x4 prop. Sounds like nothing, but I am pretty sure it is more than enough to get this little Funster flying. Did some more sanding and shaping. Pushrods are in as well and I solderd the extension wires for the aileron servos. Now I will need to plan the linkage for the steerable nose gear and the wires for the lighting system, make a battery hatch and finish up the cockpit interior. Although that last step will have to wait for the crew to arrive, and they are currently still on a boat, far far away... On the other hand, the covering stage is not so far away anymore. I am still not sure which colors to pick. I has to be a military trainer, but do I go Yellow, classic Air Force red and white, or a grey and yellow Navy scheme...? Well there is still time to make up my mind.
Last edited by High_Start; Mar 30, 2018 at 10:47 AM.
Jun 10, 2018, 03:44 AM
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It has been pretty quiet around this thread latley, but things have come together. I did a succesful maiden flight 2 days ago, and just love the way it flies.
It can really be slowed to a walk for landing, and flying at dusk was great due to the nav lights. I still need to decide on the markings though, any ideas?
The crew was made out of 2 Williams Bros pilots modified to wear headsets and I painted them as well. The airframe was covered in Oralight, which is very easy to use and keeps down the weight. The canopy was made out of a Vivak sheet, heated in the oven at 150 degrees C, and than forced over the balsa plug. It came out pretty well, considering I don't have a vacuform box. Using a 2S 800mah the total weight came out a 340 grams (12oz) and I can fly for 9 minutes leaving about 25% in the battery. All in all I am very pleased with this small Funster, I can only imagine how well the original must fly. Now I need to get my decals from Callie and finish up the cockpit. More pictures and moving film is on it's way.
Jun 17, 2018, 04:38 AM
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So here are some inflight pictures, still a little naked without the decals... It was great dealing with Callie from Callie Graphics, and I can't wait for the decals to arrive. More pictures to follow.
Jun 18, 2018, 12:03 PM
B for Bruce
BMatthews's Avatar
The in air stills show a great looking model. But how can you keep us in such suspense! ? ! ? ! How's it handle? Is it just the ticket for where you fly and how you want to fly or would you do anything different next time? How did the smaller motor work out for power? COME ON! ! ! Perspiring minds (it's getting warm around here these days) need to know these things! ! !
Latest blog entry: Garden Gliders
Jun 25, 2018, 03:14 AM
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Haha you are right, how could I? The model was build to fly from our 21 x 4 metre runway, and she can easily take off and land within it. The trike gear makes tracking nice and straight and the lift off speed is very low. It flies around quite stable and the litte motor even produces enough power to keep her going level at about 60% throttle. Loops are fine, rolls are... well it is a flat bottom airfoil, so much more than a barrel rol is not going to happen. The 2S800mah has enough power for about 12 mins of flight and as a topping on the cake the nav lights are a really nice sight flying during dusk. All in all I am very happy with the litte Funster, and I can't wait to finish the cockpit interior and put on the decals from Callie.


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