# Lighter than Air Systems

- Institution: IIT Bombay
- Department: Aerospace Engineering
- Teacher: Prof. Rajkumar S. Pant
- Level: Undergraduate
- Language: English
- Subjects: Engineering
- Source: [NPTEL](https://nptel.ac.in/courses/101101087)
- Licence: [CC BY-NC-SA](https://nptel.ac.in/faq) (Non-commercial use only.)
- Syllabus: [at the source](https://nptel.ac.in/courses/101101087)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

## Lectures

1. [Lecture 01: Introduction to the Course Content](https://invisiblenetwork.ai/learn/nptel/101101087/d6d4cbb699df) (Video)
2. [Lecture 02: Differences between LTA and HTA systems](https://invisiblenetwork.ai/learn/nptel/101101087/37805e966b1b) (Video)
3. [Lecture 03: The three conventional LTA systems](https://invisiblenetwork.ai/learn/nptel/101101087/cc37ae32f7cd) (Video)
4. [Lecture 04: LTA gases, Types of Airships and their components](https://invisiblenetwork.ai/learn/nptel/101101087/7864103472b7) (Video)
5. [Lecture 05: Introduction of Skyship 600 and USP of Airships](https://invisiblenetwork.ai/learn/nptel/101101087/33ee4df0f3cc) (Video)
6. [Lecture 06: Applications of Airships](https://invisiblenetwork.ai/learn/nptel/101101087/9be111e9f6dc) (Video)
7. [Lecture 07 :Tethered Aerostat systems](https://invisiblenetwork.ai/learn/nptel/101101087/38d4997edd3f) (Video)
8. [Lecture 08: Why use Aerostats](https://invisiblenetwork.ai/learn/nptel/101101087/47ae72781845) (Video)
9. [Lecture 09: Some Queries on Aerostats](https://invisiblenetwork.ai/learn/nptel/101101087/444a3b9ef2eb) (Video)
10. [Lecture 10: Historical developments of LTA systems, Part I](https://invisiblenetwork.ai/learn/nptel/101101087/d0a2d9df376f) (Video)
11. [Lecture 11: Historical developments of LTA systems, Part II](https://invisiblenetwork.ai/learn/nptel/101101087/ddc9280916e6) (Video)
12. [Lecture 12: Historical developments of LTA systems, Part III](https://invisiblenetwork.ai/learn/nptel/101101087/c8d7aef8c0d7) (Video)
13. [Lecture 13: Historical developments of LTA systems, Part IV](https://invisiblenetwork.ai/learn/nptel/101101087/57f18055c2eb) (Video)
14. [Lecture 14: Historical developments of LTA systems, Part V](https://invisiblenetwork.ai/learn/nptel/101101087/a109598418e7) (Video)
15. [Lecture 15: Historical developmemts in LTA systems, Part VI](https://invisiblenetwork.ai/learn/nptel/101101087/82d820f7d963) (Video)
16. [Lecture 16:Overview of PADD](https://invisiblenetwork.ai/learn/nptel/101101087/c7a500507c08) (Video)
17. [Lecture 17: Remote Controlled Airships](https://invisiblenetwork.ai/learn/nptel/101101087/953db4372825) (Video)
18. [Lecture 18: Autonomous Airships](https://invisiblenetwork.ai/learn/nptel/101101087/75be22f987b2) (Video)
19. [Lecture 19: Indoor Blimp Projects by students](https://invisiblenetwork.ai/learn/nptel/101101087/478b2e38349b) (Video)
20. [Lecture 20: Biomimetic Airships](https://invisiblenetwork.ai/learn/nptel/101101087/9e962ee07268) (Video)
21. [Lecture 21: Introduction to Buoyancy](https://invisiblenetwork.ai/learn/nptel/101101087/677463656280) (Video)
22. [Lecture 22: Basic Concepts of Aerostatics](https://invisiblenetwork.ai/learn/nptel/101101087/75026b7e14de) (Video)
23. [Lecture 23: Ballasting, Weigh off and Fuel weight recovery](https://invisiblenetwork.ai/learn/nptel/101101087/f7c59dfe0ff1) (Video)
24. [Lecture 24:In flight Ballast Collection methods](https://invisiblenetwork.ai/learn/nptel/101101087/ac0838fcddac) (Video)
25. [Lecture 25: Static Lift Prediction Part I](https://invisiblenetwork.ai/learn/nptel/101101087/febf4e6e001e) (Video)
26. [Lecture 26: Static Lift Prediction Part II](https://invisiblenetwork.ai/learn/nptel/101101087/dba46b91eb5f) (Video)
27. [Lecture 27 :Tutorial Problem 01 on Static Lift Estimation](https://invisiblenetwork.ai/learn/nptel/101101087/0c6aaec8c680) (Video)
28. [Lecture 28 :Effect of Humidity & Vapour Pressure](https://invisiblenetwork.ai/learn/nptel/101101087/ea6e8075de50) (Video)
29. [Lecture 29 :Calculation of Ambient Air Density](https://invisiblenetwork.ai/learn/nptel/101101087/05cacb6b9009) (Video)
30. [Lecture 30:Tutorial Problem 02 & 03 on Static Lift Estimation](https://invisiblenetwork.ai/learn/nptel/101101087/3a1422f80187) (Video)
31. [Lecture 31: Effect of Lifting Gas Purity, Superpressure and Superheat](https://invisiblenetwork.ai/learn/nptel/101101087/be9539e71269) (Video)
32. [Lecture 32: Ballonet Air Weight Estimation](https://invisiblenetwork.ai/learn/nptel/101101087/30a13504d6af) (Video)
33. [Lecture 33: Net Static Lift of non rigid airships](https://invisiblenetwork.ai/learn/nptel/101101087/8662fd038421) (Video)
34. [Lecture 34: Net Static Lift for other LTA systems](https://invisiblenetwork.ai/learn/nptel/101101087/9f90317a55eb) (Video)
35. [Lecture 35 :Tutorial Problem 04 on Net Static Lift Estimation](https://invisiblenetwork.ai/learn/nptel/101101087/c78ed8a38116) (Video)
36. [Lecture 36:Parameters affecting Static Lift](https://invisiblenetwork.ai/learn/nptel/101101087/c2144a293055) (Video)
37. [Lecture 37:Effect of change in Atmospheric Pressure](https://invisiblenetwork.ai/learn/nptel/101101087/d1df4fa2b934) (Video)
38. [Lecture 38 :Tutorial Problem 05 on Change in Atmospheric Pressure](https://invisiblenetwork.ai/learn/nptel/101101087/6ca4bd26bcbf) (Video)
39. [Lecture 39:Effect of Superpressure](https://invisiblenetwork.ai/learn/nptel/101101087/de97959fd4b3) (Video)
40. [Lecture 40 :Tutorial Problem 06 on effect of Superpressure](https://invisiblenetwork.ai/learn/nptel/101101087/985bd78e3b9d) (Video)
41. [Lecture 41: Effect of Slow change in Atmospheric Temperature and Superheat](https://invisiblenetwork.ai/learn/nptel/101101087/3ca8c9e51818) (Video)
42. [Lecture 42: Effect of Rapid change in Atmospheric Temperature](https://invisiblenetwork.ai/learn/nptel/101101087/e64edf4f380f) (Video)
43. [Lecture 43: Tutorial Problem 07 on Change in Atmospheric Temperature and Superheat](https://invisiblenetwork.ai/learn/nptel/101101087/49f30e8b1bcf) (Video)
44. [Lecture 44: Revision & Tutorial Problem 08 and 09 on Affecting Parameters of Static Lift](https://invisiblenetwork.ai/learn/nptel/101101087/2c627a30e957) (Video)
45. [Lecture 45:Effect of change in Relative Humidity](https://invisiblenetwork.ai/learn/nptel/101101087/eae424187f93) (Video)
46. [Lecture 46: Effect of change in Lifting Gas Purity](https://invisiblenetwork.ai/learn/nptel/101101087/1efabab4739e) (Video)
47. [Lecture 47: Effect of change in Lifting Gas Volume](https://invisiblenetwork.ai/learn/nptel/101101087/c7188e39e537) (Video)
48. [Lecture 48: Determination of Inflation Fraction](https://invisiblenetwork.ai/learn/nptel/101101087/98736a87ee12) (Video)
49. [Lecture 49:Flight To Lower Ground Elevation](https://invisiblenetwork.ai/learn/nptel/101101087/7c91cae2ea69) (Video)
50. [Lecture 50: Tutorial Problem 10 on Helium Addition](https://invisiblenetwork.ai/learn/nptel/101101087/4428fd7f7d2e) (Video)
51. [Lecture 51:Outdoor Hot Air Balloon](https://invisiblenetwork.ai/learn/nptel/101101087/b02d4fd44095) (Video)
52. [Lecture 52: Pressure Height](https://invisiblenetwork.ai/learn/nptel/101101087/fc8613afbd2b) (Video)
53. [Lecture 53: Tutorial Problem 11 on Pressure Height Calculation](https://invisiblenetwork.ai/learn/nptel/101101087/ef2ffd78a9b5) (Video)
54. [Lecture 54: Sea Level Inflation Fraction](https://invisiblenetwork.ai/learn/nptel/101101087/bd453de315c0) (Video)
55. [Lecture 55 :Flight above Pressure Height](https://invisiblenetwork.ai/learn/nptel/101101087/77aaeb40a4d7) (Video)
56. [Lecture 56: Effect of Change in Operating Altitude](https://invisiblenetwork.ai/learn/nptel/101101087/b83564ea3db9) (Video)
57. [Lecture 57:Tutorial Problem 12 on Lifting Gas Loss](https://invisiblenetwork.ai/learn/nptel/101101087/507035074945) (Video)
58. [Lecture 58: Descent Following Exceedance](https://invisiblenetwork.ai/learn/nptel/101101087/5b65d6d9fb7a) (Video)
59. [Lecture 59:Pressure Height for other LTA Vehicles](https://invisiblenetwork.ai/learn/nptel/101101087/852b543f6023) (Video)
60. [Lecture 60: Discussion of Practice Questions](https://invisiblenetwork.ai/learn/nptel/101101087/80a71b6b2375) (Video)
61. [Lecture 61: Envelope Materials Part I](https://invisiblenetwork.ai/learn/nptel/101101087/0712da0a599c) (Video)
62. [Lecture 62: Envelope Materials Part II](https://invisiblenetwork.ai/learn/nptel/101101087/a10c03d076cf) (Video)
63. [Lecture 63: Envelope Materials Part III](https://invisiblenetwork.ai/learn/nptel/101101087/861722f2cb51) (Video)
64. [Lecture 64 :Fabric Testing Machines Part I](https://invisiblenetwork.ai/learn/nptel/101101087/6911c7688b3d) (Video)
65. [Lecture 65: Fabric Testing Machines Part II](https://invisiblenetwork.ai/learn/nptel/101101087/60865ccdbb0f) (Video)
66. [Lecture 66: Need for Ground Handling](https://invisiblenetwork.ai/learn/nptel/101101087/2fef1d919c5e) (Video)
67. [Lecture 67: Aerium Hanger for CL 160 Airship](https://invisiblenetwork.ai/learn/nptel/101101087/6aee18a44bdb) (Video)
68. [Lecture 68: Ground Handling of Airships](https://invisiblenetwork.ai/learn/nptel/101101087/d676cb7a7929) (Video)
69. [Lecture 69 Types of Mooring Masts and Design Requirements](https://invisiblenetwork.ai/learn/nptel/101101087/df38a554e35f) (Video)
70. [Lecture 70 Nose Battens for Envelopes](https://invisiblenetwork.ai/learn/nptel/101101087/45359b57af10) (Video)
71. [Lecture 71: Need for Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/37bfc50afd1e) (Video)
72. [Lecture 72: Overview of Airship Design Methodology ADM](https://invisiblenetwork.ai/learn/nptel/101101087/41a3f5b1dc52) (Video)
73. [Lecture 73: Details of Airship Design Methodology ADM](https://invisiblenetwork.ai/learn/nptel/101101087/0c7ade0abb2c) (Video)
74. [Lecture 74: Inputs to Airship Design Methodology Part 1](https://invisiblenetwork.ai/learn/nptel/101101087/57704cb8eac3) (Video)
75. [Lecture 75: Inputs to Airship Design Methodology Part 2](https://invisiblenetwork.ai/learn/nptel/101101087/c343d14699ef) (Video)
76. [Lecture 76: Design Constants in Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/e56380e0f786) (Video)
77. [Lecture 77: Outputs from Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/eb5b5834dc4f) (Video)
78. [Lecture 78 : Statistical Data Used in Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/4c719e65ad5d) (Video)
79. [Lecture 79: Validation of Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/f66e02be7cc3) (Video)
80. [Lecture 80: Envelope Shapes for LTA Systems](https://invisiblenetwork.ai/learn/nptel/101101087/39bcf003497b) (Video)
81. [Lecture 81:Example of Application of Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/67023d7a7c18) (Video)
82. [Lecture 82: Conclusions and Limitations of Airship Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/8d9df7011e3f) (Video)
83. [Lecture 83: Sizing Procedure for Indoor Remotely Controlled Airships Part 1](https://invisiblenetwork.ai/learn/nptel/101101087/66e4a9e585b5) (Video)
84. [Lecture 84: Sizing Procedure for Indoor Remotely Controlled Airships Part 2](https://invisiblenetwork.ai/learn/nptel/101101087/3173e1b23f20) (Video)
85. [Lecture 85: Sizing Procedure for Indoor Remotely Controlled Airships Part 3](https://invisiblenetwork.ai/learn/nptel/101101087/b85b0793cbdf) (Video)
86. [Lecture 86: Tutorial on Sizing of an Indoor Non Rigid Remotely Controlled Airship](https://invisiblenetwork.ai/learn/nptel/101101087/4a827a6121b6) (Video)
87. [Lecture 87: Transportation Problems Faced by Remote Regions](https://invisiblenetwork.ai/learn/nptel/101101087/5435a41d032e) (Video)
88. [Lecture 88: Airships vs Helicopters Part I](https://invisiblenetwork.ai/learn/nptel/101101087/512d59e2520f) (Video)
89. [Lecture 89: Airships vs Helicopters Part II](https://invisiblenetwork.ai/learn/nptel/101101087/b3959562082f) (Video)
90. [Lecture 90:Chaar Dham Yatra Part I](https://invisiblenetwork.ai/learn/nptel/101101087/81d46266993c) (Video)
91. [Lecture 91: Chaar Dham Yatra Part II](https://invisiblenetwork.ai/learn/nptel/101101087/3684b4e9f077) (Video)
92. [Lecture 92:History of Propulsive Systems on Airships](https://invisiblenetwork.ai/learn/nptel/101101087/70e951c05afd) (Video)
93. [Lecture 93: Steam and IC engines for Airships](https://invisiblenetwork.ai/learn/nptel/101101087/3206512018c9) (Video)
94. [Lecture 94: Electric motors for Airships](https://invisiblenetwork.ai/learn/nptel/101101087/e587026e330f) (Video)
95. [Lecture 95:Turboprops for Airships](https://invisiblenetwork.ai/learn/nptel/101101087/b8c151582aae) (Video)
96. [Lecture 96:Solar Propulsion and Thrust Vectoring on Airships](https://invisiblenetwork.ai/learn/nptel/101101087/c3c0e32b2d51) (Video)
97. [Lecture 97: Lecture on Dynamics](https://invisiblenetwork.ai/learn/nptel/101101087/2145fdc2689e) (Video)
98. [Lecture 98: Lecture on Drag](https://invisiblenetwork.ai/learn/nptel/101101087/4402c1610c3f) (Video)
99. [Lecture 99: Aerodynamic Stability](https://invisiblenetwork.ai/learn/nptel/101101087/d37d18f043df) (Video)
100. [Lecture 100: Added Mass Effects](https://invisiblenetwork.ai/learn/nptel/101101087/34611dd284e7) (Video)
101. [Lecture 101: Introduction to Aerostat Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/f1946565840a) (Video)
102. [Lecture 94:Inputs for Aerostat Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/b5ab9fd64c68) (Video)
103. [Lecture 103: Design Constants in Aerostat Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/caa06cadb5b0) (Video)
104. [Lecture 104: Overview of Aerostat Design Methodology](https://invisiblenetwork.ai/learn/nptel/101101087/c33b201b9fe2) (Video)
105. [Lecture 105: Equilibrium Analysis of Aerostats Part I](https://invisiblenetwork.ai/learn/nptel/101101087/88dfd35bdaeb) (Video)
106. [Lecture 106: Equilibrium Analysis of Aerostats Part II](https://invisiblenetwork.ai/learn/nptel/101101087/9951eaa9e2f9) (Video)
107. [Lecture 107: Methodology for Tether Profile Estimation](https://invisiblenetwork.ai/learn/nptel/101101087/e4745449a4d9) (Video)
108. [Lecture 108: Sizing of Reusable Indoor Hot Air Balloon](https://invisiblenetwork.ai/learn/nptel/101101087/8413460b2a8b) (Video)
109. [Lecture 109: Tutorial on Sizing of RIHAB](https://invisiblenetwork.ai/learn/nptel/101101087/563534352fcd) (Video)
110. [Lecture 110: Introduction to High Altitude Airships](https://invisiblenetwork.ai/learn/nptel/101101087/891cdf7dd63c) (Video)
111. [Lecture 111:Technological challenges in HALE Platforms development Part I](https://invisiblenetwork.ai/learn/nptel/101101087/f9a5eddd8ef4) (Video)
112. [Lecture 112: Technological challenges in HALE Platforms development Part II](https://invisiblenetwork.ai/learn/nptel/101101087/985e3fb5810c) (Video)
113. [Lecture 113: Initial sizing of Stratospheric Airships](https://invisiblenetwork.ai/learn/nptel/101101087/ceadcc035183) (Video)
114. [Lecture 114: Introduction to Hybrid Airships](https://invisiblenetwork.ai/learn/nptel/101101087/b49e1db133cf) (Video)
115. [Lecture 115: Lockheed Martin's P 791 Hybrid Airship](https://invisiblenetwork.ai/learn/nptel/101101087/cbdfeb039a7e) (Video)
116. [Lecture 116: Aeroscraft ML 866 Hybrid Airship](https://invisiblenetwork.ai/learn/nptel/101101087/721c0a079a21) (Video)
117. [Lecture 117: SkyCat Hybrid Airship](https://invisiblenetwork.ai/learn/nptel/101101087/d145d1487c26) (Video)
118. [Lecture 118 Rotary and Winged Hybrid Airships](https://invisiblenetwork.ai/learn/nptel/101101087/578462c16526) (Video)
119. [Lecture 119 : Hybrid Ultra Heavy Lift Cargo Vehicle Transport](https://invisiblenetwork.ai/learn/nptel/101101087/63769430bef1) (Video)
120. [Lecture 120: Features of Hybrid Airships](https://invisiblenetwork.ai/learn/nptel/101101087/940b44c1972c) (Video)
121. [Lecture 121: Solar Powered Airships](https://invisiblenetwork.ai/learn/nptel/101101087/4d37b6bf63ad) (Video)
122. [Live Session 23-02-2021](https://invisiblenetwork.ai/learn/nptel/101101087/d6d4cbb699df-2) (Video)
123. [Live Session 24-03-2021](https://invisiblenetwork.ai/learn/nptel/101101087/37805e966b1b-2) (Video)
124. [Live Session 19-04-2021](https://invisiblenetwork.ai/learn/nptel/101101087/cc37ae32f7cd-2) (Video)
125. [Live Session 17-02-2022](https://invisiblenetwork.ai/learn/nptel/101101087/7864103472b7-2) (Video)
126. [Live Session 22-03-2022](https://invisiblenetwork.ai/learn/nptel/101101087/33ee4df0f3cc-2) (Video)
127. [Live Session 04-07-2022](https://invisiblenetwork.ai/learn/nptel/101101087/9be111e9f6dc-2) (Video)
128. [Live Session 20-02-2024](https://invisiblenetwork.ai/learn/nptel/101101087/38d4997edd3f-2) (Video)
129. [Live Session 19-03-2024](https://invisiblenetwork.ai/learn/nptel/101101087/47ae72781845-2) (Video)
130. [Live Session 22-04-2024](https://invisiblenetwork.ai/learn/nptel/101101087/444a3b9ef2eb-2) (Video)
131. [Live Session 19-03-2025](https://invisiblenetwork.ai/learn/nptel/101101087/d0a2d9df376f-2) (Video)
132. [Live Session 21-04-2025](https://invisiblenetwork.ai/learn/nptel/101101087/ddc9280916e6-2) (Video)