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Info on Tilt- Rototrs Needed



 
 
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  #31  
Old October 15th 05, 08:08 PM
Dave Jackson
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Default 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  
Old October 31st 05, 02:28 AM
CTR
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Posts: n/a
Default 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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