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#31
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Info on Tilt- Rototrs Needed
Hi Nick,
Are you saying that Stepniewski is no longer your favorite rotorcraft guru? Stepniewski's major contribution to the field of rotorcraft has been his comparative evaluations of the different rotorcraft configurations. His book, 'Rotary-Wing Aerodynamics', the linked report, and his last book, cover most of the rotor-VTOL configurations. To my knowledge, no one else has come near his output in the area of comparative analysis. It would be out of character for me to not close with the comment that; in Stepniewski's last work, he considered the Slowed Rotor Intermeshing configuration (ABC - Synchropter) to being the optimal VTOL transport craft. Dave "Nick Lappos" wrote in message ... Dave, That is an INTERESTING paper, deeply flawed in many ways. I am amazed at its inability to stay consistent within itself, and in its ability to understate tilt rotor empty weights, over state hover payloads, and understate cruise drags. The result is as if the author chose to simply ignore the data, and used instead his (generous) assumptions to assure his answers. A bit shocking, frankly, but interesting! If he were right, the flightmanual data I published would be reversed! Nick "Dave Jackson" wrote in message news:A3C3f.174551$oW2.118938@pd7tw1no... Nishant, You may find this of value. http://ntrs.nasa.gov/archive/nasa/ca...1993008694.pdf Due to obvious reasons getting the AHS papers is not really an option, as ordering them over the net translates into a lot of money, when converted into Indian Rupees. So, I end up searching the net. |
#32
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Info on Tilt- Rototrs Needed
Nick,
Been traveling. Hope the following is informative. BA609 USCG Configuration: Maximum Takeoff Weight. 16,800 lbs VTOL {18,000 lbs STOL} Useful Load. 5,500 lbs VTOL (6,500 lbs STOL) Empty Weight. 11,300 lbs Fuel Capacity. 2,480 lbs Standard Internal 1,500 lbs Additional auxiliary Internal/External 3,980 lbs maximum usable fuel Maximum Range (nm). 708 nm Std. Internal @ISA Payload minus Internal Fuel. 3,020 lbs VTOL (4,020 lbs STOL) Maximum Range (nm). 1089 nm Std. + Aux. Fuel @ISA Payload minus Int/ExtFuel. 1,520 lbs VTOL (2,520 lbs STOL) With effort all of the above information can be found on the internet. In regards to comparing an FAA CAT A certified aircraft to a military aircraft, the point is that it is not a fair comparison (as stated in my first postings). If it was, Sikorsky would have FAA certified the H-60 instead of selling the S-76. I have no bias toward tiltrotors, helicopters or fixed wing aircraft (having worked on all three). Each has their own nitch in the market place. Not being a pilot like yourself, I have only flown simulators for these aircraft. But the tiltrotor (in my unprofessional opinion) combined many of the best handling qualities of both helicopter and fixed wing aircraft. I hope, if you have not had the opportunity already, that you get a chance to pilot either a BA609 or V-22 simulator. Take care, CTR |
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