Uploaded November 2023 | Updated September 2026, 1 week ago
Play World of Warships here: wo.ws/3SGK3R9
Thank you World of Warships for sponsoring this video.
During registration use the code HSF2023 to get for free: 200 doubloons, 1 million credits, 7 Days of Premium Account time, HSF commander Misaki Akeno, and HSF commander Irizaki Mei.
Applicable to new users only.
*NOTE: in the video I state that the 10th Mountain Division served in Burma. It seems I got my notes mixed up; the 10th served mainly in Italy. The M1A1 was used by other units in Burma, including the Chindits and Merrill's Marauders.
Introduced in 1927, the M1A1 Pack Howitzer was designed for use in mountainous terrain, and could be disassembled into 7 smaller load for transport by mule or horse. During the Second World War, it was widely used as airborne artillery, able to be transported by transport aircraft, dropped by parachute, or landed by assault glider.
0:00 Introduction
0:56 World of Warships Promo
2:30 Development and Production
3:29 Users
4:28 Versions and Parachute Loads
8:02 Ammunition
8:51 Performance and Controls
10:45 Outro
SOURCES:
en.rcamuseum.com/75mm-pack-howitzer-m1a1-us
easy39th.com/files/TM_9-1320_75-mm_Howitzers_and_Carriages_1944.pdf
americangimuseum.org/collections/restored-vehicles/m1a1-75mm-pack-howitzer-on-m8-carriage-1927-1944
militaryfactory.com/armor/detail.php?armor_id=187
scribd.com/doc/57977084/75mm-Pack-Howitzer-Manual
bulletpicker.com/pdf/Field-Artillery-Cannon-Weapon-Systems-and-Ammunition-Handbook.pdf
arsof-history.org/articles/v1n2_mules_and_men_page_1.html
Play World of Warships here: wo.ws/3SGK3R9
Thank you World of Warships for sponsoring this video.
During registration use the code HSF2023 to get for free: 200 doubloons, 1 million credits, 7 Days of Premium Account time, HSF commander Misaki Akeno, and HSF commander Irizaki Mei.
Applicable to new users only.
*NOTE: in the video I state that the 10th Mountain Division served in Burma. It seems I got my notes mixed up; the 10th served mainly in Italy. The M1A1 was used by other units in Burma, including the Chindits and Merrill's Marauders.
Introduced in 1927, the M1A1 Pack Howitzer was designed for use in mountainous terrain, and could be disassembled into 7 smaller load for transport by mule or horse. During the Second World War, it was widely used as airborne artillery, able to be transported by transport aircraft, dropped by parachute, or landed by assault glider.
0:00 Introduction
0:56 World of Warships Promo
2:30 Development and Production
3:29 Users
4:28 Versions and Parachute Loads
8:02 Ammunition
8:51 Performance and Controls
10:45 Outro
SOURCES:
en.rcamuseum.com/75mm-pack-howitzer-m1a1-us
easy39th.com/files/TM_9-1320_75-mm_Howitzers_and_Carriages_1944.pdf
americangimuseum.org/collections/restored-vehicles/m1a1-75mm-pack-howitzer-on-m8-carriage-1927-1944
militaryfactory.com/armor/detail.php?armor_id=187
scribd.com/doc/57977084/75mm-Pack-Howitzer-Manual
bulletpicker.com/pdf/Field-Artillery-Cannon-Weapon-Systems-and-Ammunition-Handbook.pdf
arsof-history.org/articles/v1n2_mules_and_men_page_1.html










![Bendix AN5841 API Computer: Flight of the Navigator
Introduced by the Pioneer division of the Bendix Corporation in 1944, the AN5841 and the associated 12580-3-B Air Position Indicator System were used aboard late and post-war long-range military aircraft including the B-29 Superfortress. The system integrates air mileage data from a pressure pump system with heading data from a compass to continuously track the aircrafts latitude and longitude from its point of departure. The navigator could then add the wind vector to determine the true ground position.
Thank you to Tim from the channel Wistarmo Moore for providing the technical documentation that made this video possible! https://www.youtube.com/@UCsxIJ8GIz9jiDURR95Uw_UQ
Air Mileage Unit Mk.I video: https://youtu.be/HPVWMNp9EVE
E6B Flight Computer video: https://youtu.be/ 0F6JAXj8U
Jeppesen CR-3 Flight Computer video: https://youtu.be/FDje5ASk_Nc
Coutinho Course Corrector video: https://youtu.be/01hIn1YRh8A
Vetrochet Course Corrector video: https://youtu.be/4I5hT6Y3f3g
Course Corrector, Pelorus, and Marine Computer video: https://youtu.be/Lsa_UrnO-e4
Drift Sights video: https://youtu.be/weT_cEWoCBQ
Sextant video: https://youtu.be/RnXauBYXPSE
Astrocompass video: https://youtu.be/xBScbuBYv0w
Astrograph video: https://youtu.be/2RJqo5oNbWk
Planimeter video: https://youtu.be/tfVHBVGdOsg
TIFO Fisher P-75 Eagle video: https://www.youtube.com/watch?v=c0hUlf6gius&pp=ygUidG9kYXkgaSBmb3VuZCBvdXQgZGVzaWduZWQgdG8gZmFpbA%3D%3D
0:00 Introduction
1:40 Basic Principles
2:24 Air Mileage System
5:21 Compass System
6:27 Computer Dial and Controls
7:52 Computer Inputs
8:30 Computer Mileage System
8:43 Ball and Disk Integrators
9:20 Latitude/Longitude System
10:45 Meridian Convergence Compensation
11:34 Heading System
12:20 Rocker/Ratchet Mechanism
13:07 Autosyn Repeater
14:09 Motorized Drive
14:34 Autosyn Adjustment Mechanism
15:12 Variation Mechanism
15:25 Outro
SOURCES
AN-05-35-36: Overhaul Instructions With Parts Catalog for Air Position Indicator System (Eclipse-Pioneer), United States Army Air Forces, May 17, 1946 [*can be supplied on request*]
https://aeroantique.com/products/air-position-indicator-system-computer-12580-1-b?variant=31261065347161
https://usautoindustryworldwartwo.com/Fisher Body/fisherbodyternstedt.htm
https://www.scribd.com/document/439811363/selsyn-desyn Bendix AN5841 API Computer: Flight of the Navigator](https://i.ytimg.com/vi/uvjMc-m0XUA/mqdefault.jpg)