For a long time, radial aircraft engines have been arranged in a circle with their unique cylinder shells, which is very common on aircrafts. As an experiment, [KendinYap] wanted to see if he could combine 3 small DC motors into a usable RC airplane motor, effectively creating an electric radial engine.

The assembly consists of three "180" type brushed DC motors, which are installed radially in a 3D printed housing. A 3D printed bevel gear is connected to each motor shaft, which drives a single output gear and a shaft mounted in the center, with two bearings. The transmission ratio is 3:1. Various propellers can be installed using 3D printing adapters. As a benchmark, [KendinYap] tested a single motor on a scale with a 4.25 inch propeller that produced 170 grams of thrust at 21,500 rpm. Once integrated into the engine housing, these three motors generate 490 grams of thrust at a speed of 5700 rpm, with larger propellers. Three independent motors and propellers should theoretically provide 510 g of thrust, so there will be some mechanical losses when three of them are combined in one component. However, it should still be able to power small remotely controlled aircraft. It is not impossible that different propellers can produce better results.

Although there is no doubt that it can't match the brushless RC motor, the random idea is tested just to see if it might be generally fun and an excellent learning experience. We have seen some crazy flyable remote control power plants, including cordless drills, squirrel-cage blowers, and leaf blowers.

Call it triple redundancy and sell it to the army. They will make it a standard.

Interestingly, several types of plastics have been used.

I want to know if the main gear can also be made into a conical shape so that the motor can be aligned with the propeller axis instead of being perpendicular.

Then it doesn't look like a radial engine, does it ;-)

I think I can make a layout similar to the Duke engine to save some space

I have never heard of it, so I DAGS

I did not see any mention of the cooling system.

If the motor is coaxial with the propeller shaft, a simple spur gear can be used. Then maybe you can reduce some inefficiencies and use a single larger motor ;).

Add another bevel gear on the top and on the coaxial shaft, and you will easily get a counter-rotating propeller. Improved aerodynamic efficiency and less torque allow for a lighter structure.

Excellent work. Are there parallel diodes in the solenoid?

Don't expect a reply. It is just a person who has something to say about everything. I want to know what kind of radial motor he designed. Leave it to the armchair professionals. There is nothing constructive.

Finally, a single-motor 4.25×6 blade 3 seems to have more thrust than a 3-motor gear with 10×6 struts. Add in all the extra materials, friction, etc., is it really worth it? We don't see power consumption, so there is no news about efficiency. Whatever the cool concept, it looks like a solution to a problem.

I doubt it can win in any practical aspect until you really start to push really high-power micro motors that need better cooling than inline/direct drives really provide.

But damn it looks cool, a little improvement may be a good engine that can fit into your RC Piston Engine Warbird-it looks very suitable and works fine.

Did he subtract the initial weight from the final result? It doesn't look like...I want to know how the variable pitch blade performs.

The sound is great. I want one please...

Now this is an electric radial. Can't wait for 7 and 9 and then enter multiple rows. Be sure to recover the back-EMF spike, not burn it in the suppressor diode.

I want to see a 16 "cylinder" model with a pager/vibration motor

But first remove the unbalanced weight! B^)

Back in 2007, when I was in Okinawa, I saw a person using this device using motors that looked like three large drilling rigs. Spin a self-made 24-inch pillar on his remote control plane.

If 3D printing, I am worried about melting gears. If you use metal processing, etc., the sound may disappear. Maybe just use a big brushless... or a saito radial after all.

This is not the true way a radial engine works. If you use a crankcase surrounded by electromagnetic coils as a cylinder to accomplish this, I will be impressed.

Search "Electromagnetic Radial Motor" on youtube, you will find many such things!

How does this thrust measurement work? Curious people want to know. Is the kind of old-fashioned push-me pull-you going on? I suspect the measured value is too low?

How does he connect the motor to the scale? I will be nervous and laugh out loud. I have a motor with only 5 inches pillars that I can get for free, and it’s very intense haha

De-screw/screw to reduce noise

https://ae01.alicdn.com/kf/HTB1daVLiC8YBeNkSnb4q6yevFXas/Aiyima-1-pair-1-Modulus-1-3-Small-Spiral-Bevel-Gear-Carbon-Steel-Heelical-Gear-Electrical.jpg

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