As the saying goes, the bigger they are, the better they fly, making this lightweight, but large Cub ideal for trainee club pilots or for those looking for a Cub just a little larger than the normal foam models.
This model is nicely finished, with hinged control surfaces, a solid under-carriage set up, ply U/C & motor mounts as well as battery tray. Full fitting kit, screwdriver and even epoxy glue are included.
Specification: Material: EPS/Ply Wing Span: 1500mm Length: 1150mm Dry Weight: 860g Motor: 35-36 class (not included) 4 Channel, 4 x Park size Servo (not Included)
Required: Your own 4ch Transmitter & receiver 35-36 Brushless Motor 30A~40A ESC 2200mAh 3S1P 20C Lipoly Pack 4 x 19g "park" size servo's
I put a pic of my cub with the new scale wheels from Du-bros. Part number is 250t. Rear wheel is a larger foam covered wheel as well. Unfortunately I had to widen the axel for these wheels to fit up front. I tig welded a wider 4mm shaft in place of the narrow factory unit.
Check out my pics In the files section of my windowed cub. I simply cut out the foam then use the leftover epoxy from the kit and brush it on the exposed EPS foam to reinforce it. then simply paint it black with a marker or paint. I then chose some very thin lexan cut to fit wider than the opening. And mounted it with 3/8 inch wide double sided tape. It is removable and allows access to mounting frame inside plane. I sometimes mount my ipod there to take awesome videos.
I received one this week. Should be an interesting build given an instruction manual that consists of a one page black and white picture with some screw sizes and arrows.
So far all the pieces are dry-fit loosely together and the screw and attachments seem logical. Next step is to glue the tail pieces together with the supplied epoxy. Not sure if I'm supposed to glue anything else together since there are no instructions.
The suggested Turnigy S3317B servos don't quite fit the mounting locations (too large.) So I will start sanding away some wood to enlarge openings in fuselage for servo mounting. Will use exacto knife to fit them into their locations on the foam wing. All for now. Since no one is really discussing this plane I'll just record my findings as I assemble it for anyone who cares to read along.
What about the wheels. I would like to replace the bicycle wheels with something closer to scale. And maybe a little oversized. What is the axel diameter and width? Sorry for all the questions. Just want to be prepped when I get mine.
This weekend I worked some more on the plane. I was able to easily enlarge the servo mounting plate in the fuselage with some 60-grit sandpaper and a small sanding block. The Turnigy S3317B's are mounted now and connected to the pushrods for elevator and rudder.
Next I'll buy some servo wire extensions and use my X-acto to make a custom fit for the aileron servos and enlarge the wire channel that's molded into the wing. Smaller servos may fit this plane better but I don't know if they have the required power for the control surfaces...so I'll just custom fit what I have. This will give me something to do while waiting for my motor mount to arrive from the international store.
Here are the measurements on the main landing gear: axle diameter=.158" and usable length=.675". Wheel diameter=2.450". I agree that some other wheels would be nicer. I haven't looked into that yet so maybe you can turn something up given these dimensions.
Only wheels close to fitting that I can find from HK is part number 312000004. These are 75mm wheels with no mentioned width. Seems they like to leave all the needed info out for most wheels. Id rather know before I buy so I can be a satisfied customer. But for $3.69 a pair what the heck, ill try them when I order the motor parts and such. I don't see why I couldn't mount a pair of bolt on spindles from a rc 10 car or another model with the width and diameter I need to fit. Just have to remove and modify the original gear. Or at least it looks that easy to me.
Ps. 75mm is 3 inches. And they state that the hole diameter is 4mm. That's just. 0132mm too small for the axel measurement you gave us. So with a little round file work and some grease they should fit. If they are not too wide!
After work today I mixed up the supplied 10 min. epoxy and glued the tail section together. Forgot how much fun epoxy is. A lot of surface area to cover so I had to mix up a second batch. Some of it was wanting to set up as I was assembling. Epoxy is tough stuff so I figure it'll all cure and hold just fine in the end.
I saw those 75mm wheels, too. I may check them out at some point. The axle diameter probably is 4mm so it should be fine. Since it's an imported kit and all the supplied hardware is metric, it probably has metric axle stock. If not some powdered graphite like used on pinewood derby cars and a drill bit should work. Even cheapo machinist drill bits have ton of different sizes. This plane is something of an ARF and not a true "kit" as are balsa planes, but is definitely "some assembly required." I think anyone with a small degree of model building skill or good mechanical skills should be able to fabricate/modify available components and get it assembled. The flying will be another story...I'm quite the novice.
Epoxy on the tail seems to be holding just fine. I also received the motor mount I ordered for the NTN 35-30 1400kv motor. I sub assembled the pieces and checked them for fit on the firewall. Will have to drill new holes for the mount and locate some appropriate screws. Looks like I'll have to add some flat washers for shims to get the propeller backer washer out past the motor compartment. Still need to attach the wing aileron servos, too. Coming together well, but I'm taking my time. I just guessed on the motor so I'll have to take a guess on what size prop, too, when the time comes.
I was surprised mine came in such good shape. It was actually pretty well packaged.
I got the tail wheel installed today. Had to make a bend in it and attach under the rudder control horn. Seems to be working correctly. Found out that my pushrods are too long when I installed the clevises on them. The servo side has Z-bends and the clevis end is threaded. I think I'll just cut off about 10mm of the end with the Z-bend. I have a pair of Du-Bro E/Z Connectors in my **** box that I'll use to attach the pushrods to the servo arms now. Easier than messing with the Z-bends.
Well mine finally arrived. The only problem i had with it is the magnets on the left side of the nose were actually glued together. So after a sharp pull the nose came off. But one magnet ripped through the foam and needs to be reglued now. I will now start the process of gathering up the electronics for the build. Let me know how the motor and prop combination works for you. Ill be ordering servos and a receiver first then i need the motor, prop, and mount numbers. Thanks!
I did the epoxy build last night. Went pretty quick. Good fitting parts helped a lot. Lack of instructions didnt hinder me too much. But i would expect some in a kit like this for first time builders. Some people would never be able to figure out they needed to bend the sterring wheel wire to fit properly in the tail. I will be ordering a proper set of wheels in front to better suit the scale appearance. The factory bicycle looking wheels have rubber but they are simply too skinny and hard. They have no cushion for landings what so ever to fit my taste. The tail wheel will do though. Also looks like my kit fixed the previous crossed control rod problem to the tail controls. Very big plane for the money. But it is EPS and it will break up if crashed hard. I did note that the motor mount is shaped correctly for torque control. It is offset to one side slightly and angled a bit to counteract the torque made by the motor. Shaft of motor will fit nicely through nose cone.
Took my first flight last night. Flew awesome. It flies nice and slow and glides well. Didn't have any problems with balance for Cg. Motor I used was putting out over 2000 grams of thrust. With a 10 x4 for Prop. Climbed vertically very fast. Glided it in home for a smooth landing. And yes I replaced the bicycle wheels with some do bro cushioned tires Part number 250 T. they are low bounce traded wheels 2 and a half inch diameter. I even replaced the tail wheel with a foam covered larger wheel.
By the way even though this is a 60 inch plane the cockpit access is not the greatest. to remedy this I simply cut out the foam windshield. that way I had 2 openings to access the inside. When all is said and done I made a Lexan windshield and taped it in place with double sided tape. now I have a spot I can mount my iPod so I can record video in flight.
Did you do a CG test on it before flight? Are your ailerons perfectly lined up with the main wing also? You might be slightly off there giving you lift or the center of gravity (CG) might be too far back. Give them a look see. If the tail is too heavy start by adding weight forward of the wings an ounce at a time between test flights.
Not so well inverted. Rolls fine. I am using a NTM 1400 kv motor. And although there is built in angle for torgue thrust to the motor mount I still see a lot of in flight turn to the left. I have thought about putting shims under my motor mount to aim motor more to the right. Maybe it is the 10/4 prop I am using and high torgue / low rpm motor? A smaller prop and higher kv motor might see less torgue thrust in my situation. Not sure will have to test this out.