late 1960s

REDSOD was an acronym for "Repetitive Explosion Device for SOil Displacement". The machine was effectively an internal combustion engine where gasoline was burned in a combustion chamber and then a valve would open causing the compressed air to rush out and blast the soil away. The first...

Hello all Looking for help here. During the late sixties and early seventies Peruvian Air Force experimented with several load combinations for its Lockheed T-33 fleet. Among them was this pod which I have been unable to find any additional information about. Any help will be greatly...

RAF Flight Lieutenant Alan Pollock, who flew a Hawker Hunter jet under Tower Bridge and past the Houses of Parliament, has passed away at the age of 89 years. :( Sources: https://www.forcesnews.com/services/raf/flight-lieutenant-alan-pollack-who-flew-raf-plane-under-tower-bridge-dies-age-89...

Chieftan tank sales to Israel, 1968 ...

From Norman Friedman's US Small Combatants, pages 319-323 (most of those pages are pictures of PBRs, a Coast Guard 82-footer and a 57-ft Minesweeper Boat) Table 12-5. Schemes for Ocean Reconnaissance Ships, 31 March 1966 A B C D E May 1967 LBP (ft) 317.5 311 311 315 — 374 LOA...

So let's assume that Indonesian socialist leader Sukarno was more competent in terms of economic (or at least listened to better advisor) and managed to avoid the economy crisis that led to his downfall in OTL 1966. He remained relatively popular and in power; Indonesia remained socialistic and...

Hi, The Hawker-Siddeley HS.1201 was a lightweight air superior fighter project,1967, https://www.militaryfactory.com/aircraft/detail.php?aircraft_id=2303

There are two photos in the ship design section of the introduction of Brown's "Rebuilding the Royal Navy": Is it possible to identify which projects they relate to? The plan on the screen is described as a frigate, and it appears as something between a frigate armed Type 42 and Type 22...

Trying to find the earliest year the MiG-21 received the SPS-141 ECM pod, and ASO-2 chaff/flare dispensers. First, for the SPS-141 there is the only the vague 1970s period usually mentioned online. But is there info as to what year exactly did the SPS-141 (SM-1 or SPS-141-100?) became...

The saga of the Royal Navy's carriers after 1966 has been the main focus of interest here, but the workhorse of the RN then as now was the frigate. By the 1970s the RN had plans to replace its Type 12 Leander class frigates with the larger all missile armed Type 22. Leanders were designed...

https://apps.dtic.mil/sti/tr/pdf/AD0854931.pdf

The USN acquired 142 Lockheed EC121s in the early 50s to mount long-range early warning barrier patrols in the Atlantic and Pacific. The main strength was 5 sqns for each ocean with various cats and dogs supporting units. The barrier patrol lasted until 1965 and afterwards the USN transferred 30...

The possibility of the UK avoiding the 1965 aircraft cancellations has been discussed ad nauseam. I don't propose to get into it here - assume a collective delusion of the UK government, the discovery of a massive gold deposit, or intervention from extra-terrestrial intelligences, as you see...

San Diego Air and Space Museum archives on Flickr. https://www.flickr.com/search/?user_id=49487266%40N07&view_all=1&text=AH-56A

For this contest, the Hughes H-485,Bell T-37 and Lockheed,but no other contenders are known. American Aviation 1966.

I was curious to see if there had been any drawings of this paper ship plan. Basically a anti sub/ trade lane protector ship for th usn, 20 s-3 in 2 squadrons plus 4-8 small anti snuper aircraft (presumably a-4 but no design specified) and 16 sea kings, to be biult in the 70's to replace the...

In 1966, the Maritime Administration began design work on a general purpose cargo-liner to be built in large enough numbers to be useful in national emergencies and replace war-era vessels serving in non-subsidized trade, with the idea that they be designed for minimum cost. As specified in a...

Hello all. I have been reading up on Swiss MBT programs and concepts in the last few days and I noticed that Secret Projects does not yet have a thread dedicated to the Panzer 74 proposal. I am aware of the Tank Encyclopedia article on this matter but I thought I'd ask this forum.

How about a thread on the J-12 ? I noticed that there was none ! It is a jet that I like and I will try to collect in this thread some interesting things about it.

An early model, the G-303-1, I believe of the late 60's VFAX program featured canted outward vertical stabilizers like the YF-17 and F/A-18 family This feature was dropped in the later VFX program that resulted in the F-14 does anyone have an idea as to why and also what would be the effect...