The video is about a person who built a paper plane launcher using electromagnets and wants to increase its speed. They try to increase the input power, but it's limited by the voltage and current limits of the electronic components. They then use a different approach by reducing the number of turns of wire in the coils, which increases the speed of the launcher. They also use a better power source, redesign the sled, and create a mini 3D printable glider that attaches to the sled. After these modifications, the launcher's speed increases from 26 miles per hour to over 40 miles per hour.
Here are the key facts extracted from the text:
1. The video is sponsored by Ren.
2. The creator built a launcher that accelerates paper planes using electromagnets.
3. The paper planes reached speeds of up to 26 miles per hour.
4. The creator wants to increase the speed of the launcher using a purely mechanical method.
5. The launcher uses a linear motor.
6. The magnetic field strength of each coil can be calculated based on its length.
7. The creator replaced the coils with new ones that have fewer turns of wire.
8. The new coils resulted in a 35% increase in speed.
9. The creator used super capacitors as a power source.
10. The super capacitors were initially charged to 16.5 volts.
11. The voltage dropped to 13 volts when the first coils turned on.
12. The creator also tested lithium batteries as a power source.
13. The lithium batteries provided 20% higher voltage than the super capacitors.
14. The creator redesigned the sled with magnets at the perfect height.
15. The redesigned sled resulted in a top speed of 18 meters per second.
16. The speed of the launcher was increased from 26 miles per hour to over 40 miles per hour.
17. The creator designed a mini 3D printable glider that attaches to a sled.
18. The glider is designed to launch at high speeds without taking off prematurely.