Pictures of Cold War aircraft. (9 Viewers)

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Any one knows the speed for such refuellings? A KC-97 must be some 200 mph for cruising
The photo is of a KC-97L, which has 2 underwing pods, each containing a J47 jet engine (used for take-off and for short periods while refueling) - which enabled higher max take-off weight and eliminated (barely) the need for the diving refueling profile.

I have seen cruising speeds for the KC-97 of between 230 mph and 300 mph (the regular C-97 lists 300 mph as well), and the listed max speed is 375-400 mph for KC-97s and C-97s.

I'm sure that the extra underwing fuel tanks and the boom reduced the "best-range cruise speed", but in addition I suspect that deploying the boom required a drop in speed for best control of the boom.

Refueling speeds I have seen vary from 200 mph to "over 240 mph" without mentioning which models of KC-97 are being referenced.
 
An A-6A Intruder (VMA(AW)-242) was loaded with 250 lbs. bombs - Vietnam War - June 1967 SEOR

View attachment 830046
Mark 81 Snakeye fitted with a Mark 14 TRD (Tail Retarding Device) to increase the bomb's drag after release. The bomb's increased air-time, coupled with its (relatively) forgiving safe drop envelope, allowed for very low-level bombing runs at slower speed. Used commonly in the CAS role in Vietnam (prior to wider availability of GBU-series precision ordnance). Nicknamed "snake", as in the typical Vietnam support loadout of "snake and nape" (250 lb Mk 81 Snakeye bombs and 500 lb M-47 napalm canisters).


Mk. 82 500 lb bomb with a Snake Eye Tail Retarding Device – this photograph shows an unfuzed, museum display Mk82 with its usual combat paint scheme. For display purposes, the optional high-drag Snake Eye tailfin set used for low-altitude release is shown:



U.S. Marine Corps crewmen upload three Mark 81 general purpose high explosive bombs aboard a Douglas A-4F Skyhawk aircraft from Marine Attack Squadron 133 (VMA-133) at Naval Air Station Fallon, Nevada (USA), on 1 December 1982:

 
Just for fun, here's another KC-97L refueling jets - Texas ANG KC-97L 53-0355 & A-10As:

 

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