Also know that the aileron and flap control surfaces (if your using both) will need to protrude past the wing bottom surface so they can move. Understand that you will be folding this wing over, so that is why you want twice as much foam. My plane will have a 12in chord, so the foam will need to be around 24 in wide.
RC AIRPLANE FULL
For my plane, I used one full sheet (30" long) plus two 22.5 pieces on each side to equal 75in total.įor the width of the foam needed, take the wing chord and multiply it by 2. I build my wings based on the principles laid out by 1st:Start by gluing together the foam boards so they are the correct length for your wing. This is probably the most difficult step. Now, for my plane, I used this technique, but instead of glueing the foam blocks into the fuselage, I built 2 smaller "pods" that will attach to the wings via rubber bands (the same way the wing is held onto the fuselage).Ĥth: Once the glue is dry, you can screw in the motor onto the popsicle sticks, and you will have a very strong motor mount. Be sure that their spacing is the same as the spacing on the motor between the screw holes. Then glue these 2 pieces to the foam with gorilla glue and hot glue. The hot glue mainly holds the foam in place while the gorilla glue dries.ģrd: Glueing 2 sets of 2 popsicle sticks together. I recommend using a combination of Gorilla Glue and Hot Glue. The way I construct my motor mounts is by:ġst: Gluing 2 pieces of insulation foam (the thick green or blue foam found at hardware stores) that are cut to fit inside the fuselage (touching the bottom and sides of the fuselage), together.Ģnd: Glue this "block" of foam onto the sides and bottom of the fuselage. You want to be sure that your motor mount is strong enough that it won't rip of when you turn the motor on. (The BEC basically takes power directly from the battery, and drops the voltage down to a desired level, and sends power only to the servos and Receiver.) The Servos I used each drew 400mA and I'm using 6 total, so they will draw 2400mA (2.4A) total, which could be more than the ESC's can handle with their internal BEC. I knew this plane would turn out quite large, so I chose to use larger servos, which draw more Amperes.
RC AIRPLANE FREE
After equating the required spot on the receiver for the BEC (we'll get to that) I went with an 8 channel receiver so I would have plenty of free plugs. This is 5 channels, so I will need at least a 5 channel receiver. For example, I wanted my twin to have Elevator, Ailerons, Rudder, Flaps, and throttle control. I then chose a 40amp ESC (which is quite overkill, I only needed a 25-30Amp ESC, but I wanted it to run cool) for each motor.ĭetermine what controls you want your model to have, and purchase an appropriate Receiver. So, in all, I will have two 2200mAh batteries on board. I found that with a 2200mAh (2.2Ah) battery, I could get 8.8min of flight time per motor. Using this equation, (Flight Time(min)=Battery Capacity(Ah)/Motor Amp Draw(Amperes)*48) Which takes into account the 80% rule of only discharging your batteries 80% of their capacity. Once you do this, you can then pick an ESC (Electronic Speed Controller) that can handle the Amperage draw of the motor.įor this plane, I used 2 motors that would provide roughly 860g of thrust with a 10x4.7 propeller (1720g total) and draw about 12Amps each.(Info/ Recommended propeller found on motor manufacturers website). Pick a motor and battery that will give you a decent amount of thrust, and fair flight time. You will need to choose what electronics to use for your aircraft.
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