Things he did

1.  In tirupathi, on 23rd April , when in room waiting for the full day, he told "Enaku pasikuthu " for the first time. Not sure if he was bored or really hungry, but he understood the concept of calling for food unambiguosuly.
2. Yesterday on 30th May, when asked where his white hot wheels car was, he left the room, went to his toy basket, pretended to search and told "white car kaanom".
3. On Saturday, 29th May, when I came back from Vishakapatnam in flight, and entered room, he asked "Enga pona?", meaning how you went. I told I went by Bike. He replies "Dai, nee aeroplane pona.". Then "Appa, naa aeroplane ponum".
   

#10 Helicopter: Engines with 20 HP

1.  HP and PS are almost same
2. 20HP engines are in Bullet Honda Hness. No weight information given.
3. Can make Aerolite 103 type aircraft with 2 of these engines
4. Or go and make electric motor that rotates at the same RPM as the propeller or main rotor and use that.
5. 
   
   
   
6. 

   
   
   
7. Rotax 447 40HP is 29 kg in weight
8. 

   
   
   

#9 Helicopter: 2 Designs of manned home built helicopter

1.  Nolan co-axial helicopter = https://www.youtube.com/watch?v=B21Xk6tNcBw&ab_channel=AdamAitken
   
2. BTD1982 = https://www.youtube.com/watch?v=Pz8ObaByc1M&ab_channel=btd1982
3. Cameron Carter
4. Airscooter 2 = https://www.youtube.com/watch?v=V8zqG4LRnrE&ab_channel=LightSportandUltralightFlyer
   
5. MikeUSA777 =  https://www.youtube.com/watch?v=EIBQIUANlyY&ab_channel=MikeUSA777

6. Franz Schurmann

Projects completed

1.  Digital controller based on TM4C123 for single axis AMB
2.  Digital controller based on TM4C123 for two axis AMB
3. Mechanical and electrical test rig design, assembly and testing for single axis AMB (3 versions)
   
4. Mechanical and electrical test rig design and assembly for two axis AMB 
5. Design and construction of half bridge based PWM power amplifier for AMB, 1 channel
   
6. Design and construction of full bridge based PWM power amplifier for AMB, 16 channel
7. Design and construction of DC power supply system for AMB
8. Design and construction of signal generator to mimic eddy current signal with sine and triangular wave forms
9. Radial AMB simulation model with flexible rotor
10. Radial AMB simulation model with rigid rotor
11. Automated FEM model of radial AMB using FEMM tool 
12. LQR and PID control design software for tuning radial and thrust AMB

DynCont#12: Eigen value and eigen vector 3Blue1Brown

• A vector will span a line passing through it. All points along the span, the line, can be reached by the vector using scalar multiplication.
  
•  A matrix multiplication rotates and scales a vector
• A matrix multiplication will only scale a Eigen vector , without changing its span direction.
• A rotation matrix has no eigen vector. All vectors are rotated.
• A shear matrix has one eigen vector.
• There are matrices with one eigen value and many eigen vectors, like scaling all vectors on a plane.
• See these 3 matrices and one normal eigen vector eigen value matrix in 2GBAB.
  

Optimal control to expand

1.  Graph search optimal control in grid world as a starting point of the HJB equation, Chapter 7, underactuated robotics.
2. Dynamic programming from Kirk in discretized space using the previously stored state transition cost
3. HJB equation in continuous time optimal control, also linked to Dynamic programming. 
4. Assuming a solution/ S[N] expression for the HJB equation and then substituting it into HJB equation to see if it satisfies HJB and then getting the optimal gain from it.
5. Variational calculus approach to get the optimal control in continuous time from Naidu/Lewis
6. Dynamic programming based approach to get the Kalman gain matrix from Lewis for discrete system.
7. 
   

Things he did

1.  Made a finger gun and started shooting Phew Phew Phew for thre first time.
2. When asked to pour water, told to me that my mother asked him not to pour water.
3. Started singing Waka Waka song and dancing.
4. Complained to my mother that am taking sugar from his plate.