Info on Tilt- Rototrs Needed

Hey guys, I am thinking on giving a seminar on Tilt-Rotor Aircrafts as
a part of my Mechanical Engineering Final Year Syllabus. However all
the info i found on the net (read Google) deals with the BA-609 and the
Osprey specifically and not with the concept of Tilt Rotors. Can anyone
help me out? The seminar has to be about 20 pages long.

730,

The predecessor to the V-22 and the BA609 was the XV-15 NASA program.
NASA is a great sourse for information. So is AHS International. AHS
has published papers from on tiltrotor reserch from many sources, not
just Bell and Boeing.

Good luck,

CTR

You may wish to consider tilt-rotor patents; at
http://www.uspto.gov/patft/index.html

A few are;

Sikorsky's Variable diameter rotor blade actuation system ~ 6,019,578

VTOL airplane with only one tiltable prop-rotor ~ US 6,382,556

Optimum speed tilt rotor ~ US 6,641,365





wrote in message
Hey guys, I am thinking on giving a seminar on Tilt-Rotor Aircrafts as
a part of my Mechanical Engineering Final Year Syllabus. However all
the info i found on the net (read Google) deals with the BA-609 and the
Osprey specifically and not with the concept of Tilt Rotors. Can anyone
help me out? The seminar has to be about 20 pages long.

There are many American Helicopter Society technical papers that have
been given at the AHS annual forum over the years, several at a level
which would be right for undergraduate work. Ask your school librarian
for help, these are usually available in a few days.
Also, Stepniewski and Keys "Rotary Wing Aerodynamics" (Dover
publications) has a major section on tilt rotor design aspects.

Nick Lappos
For some broad performance comparisons between helicopters and tilt
rotors and supporting sites, see my site:

http://webpages.charter.net/nlappos/Disk-Loading.pdf


wrote:
Hey guys, I am thinking on giving a seminar on Tilt-Rotor Aircrafts as
a part of my Mechanical Engineering Final Year Syllabus. However all
the info i found on the net (read Google) deals with the BA-609 and the
Osprey specifically and not with the concept of Tilt Rotors. Can anyone
help me out? The seminar has to be about 20 pages long.

Thanks a lot Nick.....your comparison was really an eye-opener, so much
so that I am now wondering on whether I should change my topic...any
suggestions......(I will be seeking admission for MS in the Aerospace
in fall 2006....I guess having a related topic would help.)

Should the subject of your seminar be 'future rotorcraft', you may wish to
focus on the coming ability of blades to vary their angle of attack at
desecrate locations, as defined by the rotor's polar coordinates. Radial
positions being set by active blade twist etc. and azimuthual positions
being set by higher harmonic control etc.

IMHO, when these two abilities become operationally viable, the two most
promising rotor configurations will be the Intermeshing for light agile
craft and the Interleaving for fast transport craft.

.... to vary their angle of attack at desecrate locations, ....

Opps! Where's the Edit button?

'desecrate' sound a little to negative. Please substitute 'discrete' in the
above post.

Nishant,

If you intend to use data you have collected over the internet to
support your Mechanical Engineering Final Year Syllabus, I recommend
that you stick to published data from sources like SAE, NASA or AHS.
Referencing data, opinions or conclusions from individuals personal web
sites is not a good idea.

Do your own research of from reputable data sources and then draw your
own conclusions.

Good luck,

CTR

CTR is right, use the flight manuals where possible, as I did. CTR is a
tilt rotor advocate (CTR stands for Civil Tilt Rotor) and he works for Bell.

His coments on my presentation are fundamentally wrong, he fails to mention
that the V22 also uses aux tanks for the plot I present, as well. The weight
of the tanks is subtracted from both aircraft, the payloads are correct as
published.

The charts are backed up by the published data for each model, I will
provide the source data to anyone who emails me.

As shown in the presentation at the below web site, a tilt rotor carries
half the payload, has no range advantage over a helicopter, and has much
less transport efficiency (speed times payload) at any range..

http://webpages.charter.net/nlappos/...comparison.pdf


Nick



"CTR" wrote in message
oups.com...
Nishant,

If you intend to use data you have collected over the internet to
support your Mechanical Engineering Final Year Syllabus, I recommend
that you stick to published data from sources like SAE, NASA or AHS.
Referencing data, opinions or conclusions from individuals personal web
sites is not a good idea.

Do your own research of from reputable data sources and then draw your
own conclusions.

Good luck,

CTR

That performance comparison should take little away from the reason why the
Marines are going toward the V22, it has the speed, and they have the
mission. It just makes sure that we all recognize the reduction in
efficiency and the cost of that speed. I do think that tilt rotors will
have their place in the spectrum.
Good luck on your paper. Look at the AHS Forum papers for lots of data to
help your paper. What school are you attending?
Nick


"Nishant" wrote in message
oups.com...
Thanks a lot Nick.....your comparison was really an eye-opener, so much
so that I am now wondering on whether I should change my topic...any
suggestions......(I will be seeking admission for MS in the Aerospace
in fall 2006....I guess having a related topic would help.)