Introducing the newest addition to our Paramotor line – the paramotor auxiliary motor kit by Opale! Never fear the return of your Paramotor during slope or thermal flying when this Auxiliary Motor Kit is near.
With the use of the Opale auxiliary motor and spinner/prop assembly, you can regain altitude while still operating your pilot in optimal free flight conditions. This kit is very efficient allowing you to operate it on a very small battery pack. The lack of a large prop ring and backpack frame maintain the clean paragliding profile of the pilot.
This kit can also be used to launch the model for flying sites where slope is not available.
In the last Flight School, we discussed the different power set-ups for your RC airframe, but now, I want to dig into the electric side of things. In this segment I am going to discuss the different motors available and just what those little specs mean.
First, let’s take a look at the basics of electric motors. An electric motor converts energy from electricity into mechanical energy (Electrical4U, 2021), ultimately spinning your prop or rotor blade(s). When you break it down, you have windings, permanent magnets, a rotor, and a stator – which these parts can vary depending on the motor. For easy understanding, the stator is stationary and the rotor is what rotates. In some cases you may have a commutator (Lnelectric, 2020) and brushes (which I will touch on in a bit), but most motors used in our hobby today are brushless.
To get these parts to spin, we use the science of electromagnetism. By coiling wire around an iron rod (the windings) and running an electrical current (from a battery) through the wire, we can produce a magnetic field with both a north and a south pole. Then by using permanent magnets (and the help of an electronic speed control) we can use the science behind magnetic poles to push or pull the rotor – creating spin. When we change polarity of each pole on the stator, the rotor will spin.
If we are looking at brushed motors, there will be two graphite pieces, known as the brushes. The brushes send electric current to the commutator. The commutator is used to reverse the polarity of the poles which, as mentioned earlier, allows the rotor to spin. Remember though, this type of motor is no longer common in the sport.
Outrunner vs Inrunner: An inrunner motor has the rotor (the spinning part) inside the stator (the part that doesn’t move). An outrunner motor is opposite; it has the rotor on the outside of the stator. There are different applications for each type of motor. An inrunner tends to use epoxy or resin material (Wikipedia, 2022) instead of an iron rod to hold the windings. This reduces the “cogging” due a change in the magnetism inside the motor, leading to a more efficient motor. Inrunners are great for high KV (RPM) applications, but have much less torque.
The Specs: When you look at a motor, there are a lot of specifications, and it can easily become overwhelming. I am going to explain some common bits of information that can help you.
KV – The Kv of an electric motor is simply the RPM (K) per volt (v) under no load – meaning that is it not spinning a prop or rotor blade. In a fully efficient motor, this would be how many times the motor turns for each volt applied (Brown, 2022)
Power is the amount of energy expended over a period of time. It is measured in Joules/Second (or Watts). So your maximum power rating on a motor is going to be the maximum amount of energy expended (or work done) over a period of time.
Electrical charge, or current, is measured in Coulomb/Second ( or Amps). This rating (maximum Amps) on the motor states the current demand of the motor at full load. The Io, or no load Amp draw, is the amount of current the motor draws when not spinning a prop or rotor blade.
Efficiency of a motor is the mechanical output of the motor divided by the electrical input. The more efficient the motor, the less energy is lost.
Electric Motors also have resistance measurements. Resistance is opposition to electrical current, and many factors can effect the resistance in a motor. Some of those factors can include; length of wire in windings, temperature of the wire, and what the wire is made out of (Copper or Aluminum) (Snell Groups, 2021). The resistance of a motor will play into how efficient the motor is and how much heat is produced.
The number of poles in a motor is the “number of permanent magnetic poles, north and south, on the rotor” (Celra Motion, 2023). A good example is a 12 pole motor. It will have 6 North and 6 South poles for a total of 12 poles. There are benefits to having a high pole count, such as reduced weight, higher frequency, and higher torque. However, if you are looking for higher RPM output, then a smaller number of poles is what to look for, as less magnetic poles will produce less cogging (Celra Motion, 2023).
Selecting the right motor: When selecting a motor, there are a few things to consider. First, what type of flying are you going to be doing. Sport/Leisure flying, Racing, 3D, Scale… etc, all come with different power requirements. The second thing to consider is the weight of your airplane. According to Hooked On RC Airplanes, we can safely estimate a need of 100 watts/pound for sport flying and 150-200 watts/pound for 3D style flying (Brown, 2022). A great way to check your power system (voltage, current draw, and power output) would be to invest in a watt meter. You can find them here. In addition, the prop you run can change the need of the motor (or vice versa). “The larger the propeller’s diameter and pitch, the more current the RC electric motor will draw for a given RPM” (Brown, 2022).
Whatever your needs are, there is bound to be a motor for you. Whether you are matching the power of an internal combustion engine (listed as equivalent “cc” designation), fitting inside a narrow fuselage (check out our sailplane motors), running a gear box, or choosing between an outrunner or an inrunner, we can help! Check out our line of motors and find what works for you.
How To Install a Gear-boxed Motor in Your Hotliner
Check out this motor and ESC installation we finished! This beautiful hotliner was in need of some decent equipment, but space was clearly an issue. To solve that problem, we direct soldered the Jeti Phasor Motor and Jeti Mezon ESC with an inline configuration. This type of soldering job allowed us to keep the motor and ESC in a straight line, and close to each other, leaving room for the batteries. Check it out below!
Possibilities are endless with the Falcon Line of ESC’s. Due to the advanced processor capabilities inside the equipment, Falcon ESC’s offer many advantages. Check out this video we made to demonstrate motor reversal by simply flipping a switch on your Jeti transmitter!
AXI’s special Radian XL Motor is on its way! These motors were specifically designed with the Radian XL pilot in mind. AXi’s special motor gives you the flexibility of a motor that will fit with in the fuselage restraints, but with the quality you know and love! Order yours today and we will ship it the same day thy arrive (expected mid July).