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Yes. I've seen a video of a CH-53 performing a loop. I think an AH-64 has performed a Loop, also. Another maneuver that helicopters have accomplished are Split-S and Immelmann and a Barrel Roll. The newer helicopters designed with composite blades and in particular, composite structrure that provides support and control to the blades are more capbable of these aerodynamic maneuvers. The first helicopter loop ever recorded was in 1949 in a Sikorsky S-52. Harold E. "Tommy" Thompson was a test pilot for Sikorsky after WW2. He performed the loops at Bridgeport Connecticut. The S-52 had a 245 HP Franklin engine from a Tucker automobile. It also had the first all-aluminum blades from Sikorsky. That combination allowed the S-52 to set world speed records (129.6 mph), altitude records, and the performance of the first loops ever recorded. Here is the link to movies and stills of the S-52 looping: http://www.YouTube.com/watch?v=xhRUGKa_ImY And here is proof... Link to YouTube video CH-53 Loop http://www.youtube.com/watch?v=VC2E8RJE3Jo&feature=related http://www.youtube.com/watch?v=pdprMRMjs1c
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The only loop that does not require an entry condition is the procedural goto loop: again: /*...*/ goto again; Although a do-while loop has no entry condition per-se, it still requires a mandatory entry condition into the second and all subsequent iterations. do { /*...*/} while (true); // mandatory entry condition into all but the 1st iteration And although a for loop's condition is optional, it is implicit: for (;;) {/*..*/} // implicit for ever loop for (;true;) {/*...*/} // explicit for ever loop
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you use the walkie talkie for your helicopter
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Yes, many have done that
