Subject: Re: Hoerner
From: Doug Milliken
Date: Fri, 10 Jan 1997 19:15:02 GMT
On Tue, 7 Jan 1997, Charles Coughran wrote:
> I think I have seen a mail order address for Hoerner's two
> books, _Fluid-Dynamic Lift_ and _Fluid-Dynamic Drag_. Are
> they still available?
Suggest you try through:
John Roby -- Aircraft Technical Literature (used books)
619-583-4264 (this is from an older catalog)
3703 Nassau Dr.
San Diego, CA 92115
Inside our copies of Hoerner is an address, but I believe that it is no
longer valid... but here it is anyway -- maybe you could post here if
it is still good??
Hoerner Fluid Dynamics
PO Box 342
Brick Town, NJ 08723
Excellent books!!!
Subject: Re: Required torque to obtain bolting force
From: fabio.beretta@iol.it (Beretta Fabio Alfonso)
Date: Fri, 10 Jan 1997 17:35:56 GMT
"Chang-Mun Bae" wrote:
>I'm mechanical engineer, dealing with petrochemical equipments.
>Sometimes, I need to calculate torque value to obtain required bolting
>force.
>If anybody could tell me the formula converting bolting force to torque,
>I'd appreciate very much.
>cmbae@bbs.para.co.kr
I think that the formula you need is:
Ms = V(f*(Dm/2)+(dm/2)*tan(alfa+fi))
where
Ms torque applied with a tool,
V bolting force,
f friction factor (usually 0.10)
Dm Medium diameter of the bolt head
dm Medium diameter of the thread
alfa Angle between the thread and a plane perpend. to the bolt axis
(normally 2°)
fi = f1/cos(teta)
f1 friction factor between threads
teta Angle between the thread face and the plane perpend. to the
bolt axis (normally 30°)
If you want to see the way to obtain it, it's written on the most part
of the "manuals for engineers".
--------------------------------------------------------------
Fabio Alfonso Beretta fabio.beretta@iol.it
Creative WebPhone number fabio.beretta@iol.it
Student in Aerospace Engineering
POLITECNICO DI MILANO (ITALY)
--------------------------------------------------------------
Subject: ANNOUNCEMENT: 1st International Conference on Emerging Technologies for Micro Air Vehicles
From: "Thomas R. Collins"
Date: Fri, 10 Jan 1997 15:22:56 -0500
ANNOUNCEMENT: 1st International Conference on Emerging Technologies for
Micro Air Vehicles, Georgia Tech, Atlanta, Georgia. 19-20 February,
1997.
The early registration fee of $200 per person is due by January 15th.
(After this date, registration is $250.)
Conference description:
The development of a very tiny but highly functional autonomous flying
vehicle has been an unrealistic goal until relatively recently. Now seen
as a natural convergence of microelectronics, Unmanned Aerial Vehicles
(UAV), and MicroElectroMechanical Systems (MEMS), the concept of such
vehicles has become the focus of several groups around the country
because of recent technological successes in these fields. Accelerating
advances in such areas as propulsion and inertial guidance have made a
flying vehicle with a six-inch wingspan a likely reality in the next few
years. A series of workshops and meetings at DARPA in 1995 involved
early researchers in this field in the planning process, and led to the
establishment of the DARPA micro Air Vehicle (microAV) Program.
Significant technical challenges abound in bringing the microAV concept
to fruition. The aerodynamics of such tiny flyers may well be different
from the aerodynamics of larger aircraft, and many details of
propulsion, power sources, payloads, controls, and other technical
issues remain unresolved. The likely missions for microAVs are still
evolving, and the methods of operational deployment are completely open.
The actual usefulness of microAVs remains to be demonstrated by an
example.
This opening of a new realm of investigation on microAVs provides an
opportune time for this Conference, a chance to gather together as many
as possible of the pioneering researchers in this field and to stimulate
cross-fertilization between the many technical areas of expertise that
will be required for the successful development of these innovative
vehicles. Major General Kenneth R. Israel, Director of the Defense
Airborne Reconnaissance Office, will speak. Dr. James McMichael, current
head of the DARPA microAV Program, and Colonel Michael Francis, former
head, will also address the conference. If you are actively working in
an area that is relevant to microAV development, we encourage you to
attend.
Technical sessions will include:
Aerodynamics and Flight Control
Propulsion and Power Supplies
Sensors and Operational Scenarios
For additional information, see the web site at
http://spbtrc.gtri.gatech.edu:80/microvehicle/
Or contact Georgia Tech Continuing Education at (404) 894-2400.
