Post by aerofoto - HJG Admin on Mar 27, 2015 1:07:28 GMT
those Strange looking thingy ma jobbers - Du- Flunkys on the back of the Convairs Wings
"ANTI-SHOCK BODIES" .... is their technical term .... and they were also otherwise affectionately known as the "KUTCHMAN CARROTS" through being named for their designer.
They functioed on the basis of an Area Rule concept .... ensuring continued airflow over the upper wing surfaces and reduce/delay the aerodynamic shockwave which otherwise increased drag within the very high MACH airspeed range.
tHe TU154 features something similar too .... I think .... BUT .... Walter's the best peron to explaijn all about that.
The "Küchemann Carrots" were invented by a German born scientist to reduce drag. On the Convair jets they should help to overcome the gap between promised and real speed. As the CV 990 had also a range problem flown at the promised speed the idea came up to fill the "carrots" with fuel which brought an additional problem: vibrations. So some years passed until all that was ironed out and the CV 990 behaved like its nickname promised "Coronado" "the crowned one" the fastest US airliner of its time. But the Tu-154 could fly also that fast but also only with a high fuel burn, so its speed pontential was also traded against range in practical airline operation. In various Russian airplanes the main gear retracted into "canoes". The first idea was to find room for the hefty big legs these creatures should wear. That they also reduced drag was an additional benefit. The Tu-16 bomber design was one of the first which used the area rule (also invented by a German scientist afterward reinvented by Withcomb) by the design of its body around the engines. the same design had also the Tu-104. According to Russian sources the Tu-16 thanks to the area rule could fly faster, further and with more payload than comparable US bomber designs (B-47)of the same time. The "carrots" and the area rule relate to certain aspects of behaviour of the flow of air at speeds from M 0,75 to M 1,3 were "streams" of airflow mix in 3 dimensions and create a sudden increase in drag, an affect which can be suppressed by modulating carefully the diameter of the aircrafts body or putting "carrots" on a higly swept wing.