This summary has been a long time coming and if you already follow this blog and my You Tube channel, much of what you are about to read or watch has already been covered. However, I wanted to do a bit of a wrap up to review some of the more important points and some of the items I may not have discussed to this point.😊
I have certainly become a convert to using quad motors in my single motor, prop in slot park jets. Their light weight and incredible power certainly fits the way I like to fly. Of course this power does come with a cost in both money and amp draw and requires some consideration about which plane to choose and how to build it, but for me it has been worth it.
Here is a video I shot that this blog supports.
I mentioned three major sources of information that I found very helpful making the correct choices to achieve the power setups I was looking for. Here they are.
- quad racing motors tend to be much lighter, saving anywhere from 15-25 grams just in motor weight alone;
- paired with the right prop and ESC, they can produce equal to or often far more power than the standard 2212 2200 kv or 2212/5T 2700 kv motors, so very high thrust to motor weight ratios;
- with so much time and effort being put into the development of lighter, more powerful quad racing motors all the time, the performance is increasing in leaps and bounds whereas the 2212 2200 kv motors other than perhaps becoming cheaper, have not changed much in the last several years from a standpoint of weight and power output;
- although quad motors are often more expensive, because there are so many different companies making them, the competition is fierce and you can often find them for a very reasonable price. For example, I have only paid full price on about 25% of the motors I have purchased in the last year, the rest were all picked up on sale (although one could say I might have gone broke saving money😏);
- many quad motors are designed to be run on batteries from 2-6S, so a wide choice of battery options;
- if you find a motor you really like, they are often sold in bunches of four at a more reasonable price.
- due to their smaller physical size, they often might not have the torque of a 2212 2200 kv motor. Even though the test bench numbers might show incredible performance, sometimes because they are about half the physical size of a 2212 size motor, they just don't have the "muscle" to push a larger, "draggier" plane around or deal with windier conditions. Therefore airplane size and weight becomes very critical. I have found that planes with about 27" wingspan or less and under about 21 oz AUW work the best, as always, the lighter the better;
- when you build your "prop in slot" plane, you do need to adjust the front of the prop slot quite a bit to compensate for the much shorter "bell/can", otherwise the prop will run far too close to the leading edge of the prop slot causing a lot of noise and causing the prop to run much less effectively/efficiently;
- with a couple of exceptions, I have found that motors with a stator size of 2306 or better (2406, 2307, 2207, 2208 for example) and greater than 2600 kv seem to give the best power when looking for equal or better power than produced by the 2212 2200 kv motor setups;
- they are often considerably more expensive than 2212 2200 kv motors which can often be found on Ebay for $5 USD, but there are some fairly reasonable options available that are pretty peppy and much lighter than a 2212 2200 kv motor setup; and
- they are considerably more "amp hungry" than the 2212 2200 kv motor, normally requiring a 40A ESC on 3S whereas you can often run the 2212 2200 kv motor with a 30A ESC.