Hero is a mermaid Setting is outer planet Important object is a special potion Key Theme is search inside for wisdom After Hippolytus was cursed by his father, Theseus, a tornado came out of nowhere knocking him off from his chariot, and the chariot slammed down on him. Then, a wave of tsunami swept away Hippolytus and a dozen villagers of Troezen, and it swallowed Phaedra’s dying body. Aphrodite was still passionate about Phaedra’s love for Hippolytus and brought a healing potion delivered from Europa by mermaids. It kept Phaedra alive in the water. But the potion contained the deep sea superfluid found 10 times deeper than earth’s deepest ocean. The superfluid made her grow older by 30 years in mere 3 weeks. The mermaids from Europa also surgically removed the drowning victims lungs and implanted gills on them so that they could survive in the water for the time being. Hippolytus’s trampled body was repaired, but any surgery removed parts of their memory of the recent events. When Hippolytus and Phaedra woke up from the surgeries, they had to learn to breathe with the gills and walk underwater. They needed to learn to speak with whistling voices in water like dolphins did around them. Hippolytus and Phaedra could not recognize each other due to the lost memory and the change of appearance of Phaedra with aging and surgeries. After the situation stabilized, Phaedra and Hippolytus and the drowned villagers were carried back to Europa to start a new life. Hippolytus’s intelligence and stamina eventually shined through. He dove down to the deepest abyss of Europa to obtain superfluid for a selfpropulsion craft. He told Jupiter that he wanted to visit Earth using the superfluid propulsion. Life in the Jupiter planet system was not new, though. The Jupiter gas giant had been guarding the universe's top secret in Europa with the help of mermaids for thousands of years. Selfsustaining superconductors and superfluids were buried deep in Europa, while antigravity and fifth dimension drives were hidden in Jupiter clouds. He knew that humans were prone to abusing technology and were not to be trusted with the powerful tools. He watched humans create hydrogen bombs from Dr. Einstein's equation that was meant to benefit humanity. Perfectly good meaning technologies almost annihilated earth with many nuclear bomb launch scares and accidents. Jupiter showed mermaids how to use the superfluid packets to obtain information of earthling’s activities across long distances, including voices, videos, and news. He asked any one that wanted to leave Europa for earth to understand what they are going into before embarking on the journey. They watched and listened to the events occurring on earth. And they learned the selfdestructive human inflictions. Countless days passed, each day on Europa was a year on earth. Phaedra and Hippolytus meet again after two thousand years. They realized that they could not go back to earth any more. They realized they were meant to be together and have children. They had been helping Jupiter guard the universe’s secrets ever since, by building a thick ice cap on top of Europa’s ocean surface. Postscript: Mermaids are a reference to people in regions where Covid19 is less prevalent. And selfdestructing earthlings is a reference to countries in lockdown. Latest news report that immigration and guest worker programs are all put on moratorium by a presidential executive order in late April 2020. And the myth is a reasoning for the situation.

Thursday, July 30, 2020
Friday, May 22, 2020
IoT Platform Endurance
The GensAce900mah/Tattu1000mah airsoft riffle battery has capacity of 970mah. 4S configuration. Flight time is 0.97Ah x 90% x 4 x 3.7V / 22.2W(power for cruise with HD video) = 0.582 hour = 35 minutes. The implication is that the craft should be reproduced for 1 billion units and deployed around the globe for traffic monitoring/road side assistance applications. Every person should have an assistant drone nearby whenever they step out of the door. Think terminator micro drones but on human's side. Each cell weighs 18.9 grams. Energy density 0.97Ah x 3.7V / 0.0189kg = 190Wh/kg. Takeoff weight is 250 grams. Total battery energy is 0.97Ah x 4 x 3.7V = 14.4Wh.
The DJI Mavic mini has 50% less flight time of 23 minutes with HD video while carrying 20% more "fuel" with 17.28Wh battery energy, as this video shows, .
The reason DJI's drone is much less fuel efficient is because the disk area of our IoT platform is much larger. DJI's 4 4inch props have a combined 50 square inch area, which can be covered by a single 8 inch prop. Our IoT platform has a 19 inch prop with 280 square inches area, but the straight blades give a sloped wing loading halving the effected area to 140 square inches, equivalent of being covered by a 13.4 inch prop. We can calculate that our IoT platfrom's fuel efficiency is (17.28Wh/0.383h) / (14.4Wh/0.582h) = 45W / 24.7W = 1.82 times that of DJI's efficiency, or 1.68 times considering GPS power consumption of 8% is absent in this IoT build. So, the 140/50=2.8 disk area ratio is roughly the square of fuel economy ratio because 1.68x1.168=2.8. And fuel economy is proportional to prop diameter ratio, 13.4 / 8.0 = 1.68. This is expected Newtonian physics.
The endurance build dives in this video,
Carbon fiber main shaft
ESC Build
Fasteners
16 Amp ESC Substitutes
Further fuel economy optimization
We will optimize toward the first hump because the second hump's efficiency can only be, at best, 70% of the first hump's efficiency. We will not optimize with the thumbnail/front chart of the video because it only optimize the motor electrical input/output power ratio for the second humps, not the overall efficiency.
efficiency is 15.4g/W , 15.4/14.3 = 1.077 , or 7.7% better efficiency
fuel quantity is (807)/80 = 0.9125, or 8.8% less fuel
so it actually reduces flight time by about 1.1%
>>> print len
13
>>> print th
6.501
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
3.589681671911649e05
>>> th = 6.5
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
0.0001730334889344931
>>> th = 6.5005
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
6.856830542645298e05
>>> len = 11
>>> th = 5.5
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
0.0005539328105257368
>>> th = 5.409
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
0.018321437736627644
>>> th = 5.4095
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
0.018217716300952702
>>> th = 5.49
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
0.0015200932865191419
>>> len = 12
>>> th = 6
>>> math.sqrt((12*math.cos(math.radians(th))len*math.cos(math.radians(6)))**2 + (12*math.sin(math.radians(th))+23len*math.sin(math.radians(6)))**2)  math.sqrt( 23**2 + (len12)**2 )
0.0
>>> 13 / 12
1
>>> 13 / 12.0
1.0833333333333333
>>> 6.5 / 6.0
1.0833333333333333
>>> 11 / 12.0
0.9166666666666666
>>> 5.5 / 6.0
0.9166666666666666
>>> 13 / 11.0
1.1818181818181819
>>>