Picture of 8 Ft Wingspan Coroplast RC Piper Cub Flown by 25cc Weed Trimmer
I love Radio controlled airplanes and have built several kinds from balsa to this large scale plastic one.

This one is made from $25.00 worth of plastic I bought locally at a sign company.
The plastic is Coroplast or corrugated plastic, its cheap and builds fast.

You could also use old election signs, you just need to paint them or make a patchwork airplane.

Total cost with radio and motor was around 350 bucks.

This is an extensive build and can be scaled down for a smaller plane if you wish.
A working knowledge of RC airplanes is recommended to build one of these.

Its also a tough model, it can take several crashes without too much problem.

I have built a couple of the Aircore brand fold and glue airplanes and used them to learn how to fly, I strongly recommend starting out with one if you want to get into glow engine airplanes.

Balanced properly its a predictable airframe. Due to the simplified flat wing it will tip stall with you at low speeds, so learn how it stalls at high altitude before slowing down for your landing. The ailerons are large enough for a decent roll rate.

As with all gas powered airplanes please be careful wile starting it and have fun flying.

Zachary M.

Step 1: Specifications:

Picture of Specifications:
Semi Scale J4 Super Cub

8 Foot wingspan 16" chord wing with landing flaps
4.6 Foot fuselage without motor, I moved the motor forward to balance the airplane. So max length can be 5.75 feet

25cc motor with 9.5 pounds of thrust.

Total weight with fuel is 15.75 pounds.

Max speed around 45MPH

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EvanM76 days ago

I can't find the plastic at any local company or home depot. Any suggestions?

Tweakster1 month ago


Thanks for your reply and yes you are right but the nerve of that clown after someone spends time to give us something.... I had not even flown a rc plane for a full week and stumbled across this instructable, and must say a very Kool website... started building this plane the hobby shop in town were a little shaken I decided to start building at such and early start, mouths were hanging... did not tell em Zac has a website out...

bsamuel22 months ago

what are included in the plans for this plane. I wanted to know because I do not have a pro membership and I wanted to know before I buy it

bmoreau11 year ago
The link to "Wackerengines", is dead. Page doesn't exist.
nickademuss (author)  bmoreau12 months ago

yes sadly they have gone under, so its a little harder to make the craft now, you need to find someone who can make the parts for you....

Where can I get instructions or watch videos on how to build an rc airplane with a weed wacker motor? Also parts? I am new to this hobby, but i am very excited to build one of these. Thanks.
ekici443 months ago
hi we can use the electric motors in the aircraft
nickademuss (author)  ekici442 months ago

you would need a very large pricy motor and many batteries, yes you could do it, but the cost would be very high. Thats why real aircraft burn fuel as well.

nickademuss (author) 2 months ago

Its been many months since I looked at my own instructables and wow, I am glad people are enjoying them thank you for the kind comments. I have had a couple of kids in the past two years and have been very busy with them. I see a lot of questions and some complete builds. Also some criticism of my instructions, thats fine, I am not nor do I claim to be a professional writer of instructions. After all you get what you pay for.

Tweakster5 months ago

Goof Muhammad dont talk to Zac like that the guy did us a favor not our fault your mentally challenged and did not understand his plans, other is you sound foreign go back to your country, goofball take a walk clown we were having a good time till you opened your fat lips

weish Tweakster3 months ago

was it really necessary to bring race into this, tweakster? yeah he was a bit rude in his comment, but turning the hostility up to 11 isn't the answer. please remember the instructables "be nice" comment policy exists so that our community remains a friendly one, for newcomers, foreigners, and even the rare rude person.

DouglasJ1 weish3 months ago

Foreigners... It's an interesting concept. At this stage of the conversation it may be well to point out that everyone in the USA is a foreigner to the rest of the world.

The Internet is an International website. I don't remember being told when I signed up that it was a US only website. I do recall when I open a window to write a comment, I'm reminded of the "be nice policy". So is everyone else so really, there is no reason to tolerate rude or insulting people for any reason.

90% of the ideas here were at one time invented or described on similar sites to this one but totally alien to most Americans who more often than not expect everyone they meet to speak English.

That might be the reason why the largest nation in the world (China) teaches Foreign languages to its children. I think you're right in what you say Weish but I don't believe there is any place here or anywhere else where rudeness should be tolerated. Rarely or not.

I think Zachary did an excellent job of describing his project. If someone didn't comprehend it, all they need do is ask for clarity. I can't speak for Zachary but I'm sure the majority of people in this group would be only too happy to explain whatever it is someone doesn't understand. I've thought for a long time about using a small 2 stroke "brush cutter" engine to power a model.

Sorry I used your reply as my launch pad for posting my opinion but I thought about foreigners and figured I'd put in my 9.23¢ worth. (at exchange rates).

And this folks, is why everyone in our world is dying. Because, we have people with 1/8 of a brain saying rude things about one another! So please, think before you speak. PS: Awsome project dude! I love RC planes too.
robotfrick4 months ago
hw much is the tc pad
robotfrick4 months ago
good but if I want it in an aeroplane shape how will I do it and how will I get the materials.how many motor will I use and the power of the motor.plz I need reply I wanna do mine too in an aeroplane shape.
Muhammad Ahmed Khan made it!7 months ago

HI Man !

I dont understand wht you have shared with us u didnt mention the fuselage width any where (fool) , I had to modify this plan at several places without those modification it was very poor in strength if u wanna share something with public so plz be honest . I made this cub u can see here !! DLA 32 motor 7 feet span :-)


Holy cow, that thing's enormous! Nice build, looks like it must be really fun to fly.

jmensi1 year ago
Where are the PDF plans. I don't see it
ndurrett2 years ago
What was your all up weight
nickademuss (author)  ndurrett1 year ago
16lbs with the 25cc motor
anime_grl2 years ago
hello! would anyone be able to send me links of where i can get some of these items online? pleease??
nickademuss (author)  anime_grl2 years ago
most parts can be had at a local hobby shop or tower hobbies online.
hello, i am about 3 quarters of the way through with the construction of my plane using yours as a guide. i have made some changes. i could not get the coroplast to hold using the glue. i used pop rivets (1/2 inch) with aluminum washers on the other side to hold the wing together. instead of using 2mm coroplast on the top of the wing i used 1mm plastic that i salvaged from an old sign. i also made my own landing gear from an old sign that was 1/8" aluminum. i made it to the measurements from the ordering page in the catalog. i cut it to shape and used a metal break to bend it, it turned out nice. i didn't exactly know how to mount my engine so i drilled two holes in the engine mount (one on each side) and tapered them and using blind nuts i bolted it to the firewall. also you must have had something that turned your carb sideways because i had to make a throttle linkage that bolted to my crankcase to pull the throttle straight back. so i had to mount my throttle servo inside my fusalage and drill a hole through the firewall to connect my pushrod. another thing i did was drill some small holes in the hinge about 2" apart to make the hinges on the tail easier to bend. i am waiting to order my radio so i can get this thing airborn. i have tuned it and fully loaded (minus the receiver) it weighs 16+ pounds.i just wanted to say thank you for all your help and wish me luck
nickademuss (author)  jonathan19762 years ago
your welcome, strange you couldnt get the glue to stick, it wasnt foam safe CA was it, that stuff is weak. And you ran a torch over the plastic to burn off the oil didn't you?
yanadica3 years ago
how does it turn
i didn't make this instructable, but almost all radio controlled airplanes of this size use servomotors to move the ailerons, rudder, and elevator to turn, the same way a full-size airplane does. to initiate a coordinated left turn, you give left aileron and rudder, then slowly increase rudder while bringing the aileron stick back to neutral, using the elevator to prevent it from nosing over. you then neutralize the rudder, and give a bit of right aileron to bring it back to level. do the reverse of this for a right turn.
Herminator3 years ago
Wow this is awesome! Planning on building this when I finish year 12.

I noticed in the Parts list that the Gas tank conversion kit, it says in the specs (do not use with Flextanks) but the tank in the parts list is a Flextank. Is that an error or does that tank hold up to gas?

One more question, I only have access to 900x600x3MM thick coroplast, would that be ok for the whole plane including the top and bottom of the wing?
BTW I will be making a two piece wing for easy transport with a small wooden spar in each wing plus a removable metal tube that goes into both wings so they don't fold.

I was actually already thinking of making a cub with a 25cc weedwacker engine then found this incredible instructable, made my day!

Thanks for your time! :)
nickademuss (author)  Herminator3 years ago
Oh he fuel tank....the tank itself works fine, the stopper and tubes that come with are not gas safe, the conversion kit makes it safe...
So i can now get a hold of 5mm and 3mm coroplast in 900x600mm sheets, its already underpowered with the 25cc weedwacker, do you think 5&3 for the wing would be too heavy?

Also i have already purchased five of these for the wing/throttle.

Would this be a suitable servo for the tail surfaces?

Just wanna make sure before i go ahead and start building :P.
nickademuss (author)  Herminator3 years ago
The rudder dont need as much power as the elevator, I would go at least 100 Oz torque on it. Thats the only way you will be sure to get enough control in a crisis situation.

!8cc was underpowered, 25cc tuned was pretty good, 35cc would be great :)

As to the thickness you plkan on using, it will work, but it will be slightly heavier and hard to fold.... 2mm top wing was easy to build...
nickademuss (author)  Herminator3 years ago
I used 2mm for the top of the wing because it curves and bends easy, 3 mm may be to thick for that, the rest could be made with 3mm though it may not be as ridged as 4mm for the hull and bottom of the wing.

I tried to make a two piece wing once, the problem you will see is that when you make a long wing it gets much more support from the long length of coroplast on the bottom and it stops the flexible plastic from giving. The two pier one I made with an aluminum pipe for a center spar let the whole wing flex allot so much I was afraid to fly it. You might have better luck!

Thanks for the comment! Ad good luck
donphipps3 years ago
Is there a set of printed plans for the large scale cub.
What a nice looking plane, I have been in RC for years but got out of it when I started to fly a Powered Parachute but seeing that I am getting older and retired and thinking I might have to give that up and I don't want to give up flying. When I was fly RC i built a BalsaUSA 1/4 scale cub which had a 108 inch wing span, I feel this is a good starting point.
nickademuss (author)  donphipps3 years ago
Their are measurements in this instructable, no plans per say. Just keep reading, its not like balsa were you build on prints, this is mush simpler.


Oh this one will not fly like balsa, its heavy, it will fly like the real plane.
Thanks, I noticed the dem. when I downloaded the plans. Looking forward to start building.
Tweakster3 years ago
thanks again Zac for this Instructional

for other builders I sent Zac 20 bucks for a case of beer but he said he is using it for Hobbies, would be nice if others could do the same as I think The Great Brain of Planes deserves to have us pay for his Plane

Believe U me I appreciate this...
nickademuss (author)  Tweakster3 years ago
your the best mate Cheers!
Tweakster4 years ago
so what is prop size?
nickademuss (author)  Tweakster3 years ago
it varies for whatever engine you use, but a 16x6 to 18x4 would be a good starting point, you want max rpm, so you may have to try a few to get it...
donphipps4 years ago
trying to figure out how to download the plans to build the cub, need help
nickademuss (author)  donphipps3 years ago
you should see a .pdf icon at the top click on it and it will let you download, if your a member....
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