From ccoleman at MIT.EDU  Mon Apr  5 00:06:48 2004
From: ccoleman at MIT.EDU (Charles P Coleman)
Date: Mon, 5 Apr 2004 00:06:48 -0400
Subject: [Unified-mailman] Bashir's Modulus
Message-ID: <BEEMIDHJNJCMLELHFODHKEPEEJAA.ccoleman@mit.edu>

Class-
Omar save the day!
Charles

-----Original Message-----
From: Omar Bashir [mailto:bashir at MIT.EDU]
Sent: Sunday, April 04, 2004 11:53 PM
To: 'Charles P Coleman'
Cc: unified-gta at mit.edu
Subject: RE: Foam Densities/Young's Modulus


If you'd like to tell the students, my group did a cantilever-beam test on
the blue foam last year and found the Young's modulus to be 21.25 MPa.

Attached is a 1-pg word doc which explains our experiment.

Omar

 
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From ccoleman at MIT.EDU  Mon Apr  5 07:33:59 2004
From: ccoleman at MIT.EDU (Charles P Coleman)
Date: Mon, 5 Apr 2004 07:33:59 -0400
Subject: [Unified-mailman] Prof Drela's foam data
Message-ID: <BEEMIDHJNJCMLELHFODHAEPHEJAA.ccoleman@mit.edu>

Class-

Prof Drela has been kind enough to share his detailed foam data. It is
attached. Please note his observations.
Prof Drela's data is from 5 May 2003. Again, you might want to measure the
values for yourselves!

At this point, the foam data is for your information only.

Best-
Charles
-----Original Message-----
From: drela at MIT.EDU [mailto:drela at MIT.EDU]
Sent: Monday, April 05, 2004 12:02 AM
To: unified-prof at mit.edu
Subject: Re: Foam Densities/Young's Modulus


>I don't have  Young's modulus information in my old e-mails.

Charles,

Data is attached.  Send it to the students if you like
(I thought you might want them to measure it).

Note that we have two types of blue foam -- the "Dow blue" and the
Hi-Load 60.
Also, the modulus varies greatly along different directions.

- Mark
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From chipd at MIT.EDU  Mon Apr  5 07:56:23 2004
From: chipd at MIT.EDU (Carl C Dietrich)
Date: Mon,  5 Apr 2004 07:56:23 -0400
Subject: [Unified-mailman] Fwd: submitting computer files
Message-ID: <1081166183.40714967e2ec0@webmail.mit.edu>


Dear Students,

To increase the happiness/life-expectancy of your graders (which is always a
good thing for
everyone), please take note of the requests below.  The requests are not
unreasonable,
and they may help you easily catch unintended errors in your submitted code.

-Carl


----- Forwarded message from JoHanna Przybylowski <johannap at MIT.EDU> -----
    Date: Mon, 05 Apr 2004 05:32:09 -0400
    From: JoHanna Przybylowski <johannap at MIT.EDU>
Reply-To: JoHanna Przybylowski <johannap at MIT.EDU>
 Subject: submitting computer files
      To: unified-gta at mit.edu

Ack. Sorry for the multiple emails.

I almost forgot, Carl had asked me to put in writing what I was explaining 
about submission of computer problems.

Basically, I'd like students to test run the files after zipping them, just 
before submission; it would save the graders a great deal of time. And at 
least, as was the case on this last pset reduce the debugging graders had 
to do. For example, it took me about 30min to figure out that the reason 
the output to file in the palindrome program wasn't working was because the 
student assumed that the output file already existed.

Also, I think sometimes students might be accidently submitting the wrong 
version of their code. The most obvious example is submitting code listings 
rather than code. Having them check by running the code would let them 
catch the error.

And it would be nice if students who don't have the full program working 
(i.e. they only were able to implement part of it) state what works and 
what doesn't work. They should also leave the code in a form that can be 
compiled and tested, even if it doesn't fully answer the problem.  That 
would save grading time tremendously and eliminate situations where I spend 
a chunk of time trying to debug why JK's original code doesn't work for 
something it wasn't written for; yes, someone simply turned in an 
unmodified version of JK's code.

An example for this upcoming pset, I told someone today at office hours was 
that if they didn't have time make the code to insert a node in the middle 
of a doubly linked list run correctly, but had insert_head and insert_tail 
working, they could submit a code that runs and demonstrates that 
insert_head and insert_tail run and mention that insert_middle was not 
working. I also suggested simply commenting out the part that doesn't run 
correctly rather than deleting it.

If you guys could send out my comments in a more coherent email, I think we 
can make grading computer programming problems run much smoother.

Thanks
-johannap


----- End forwarded message -----




From chipd at MIT.EDU  Mon Apr  5 08:09:25 2004
From: chipd at MIT.EDU (Carl C Dietrich)
Date: Mon,  5 Apr 2004 08:09:25 -0400
Subject: [Unified-mailman] Office Hours Yesterday (non-causal system problem)
Message-ID: <1081166965.40714c758bdee@webmail.mit.edu>



Dear Students (particularly those in office hours yesterday),

Because I was trying unsuccessfully to figure out the convolution of the
non-causal
system (part b of the Oppenhiem problem) on the fly during office hours
yesterday, 
I am concerned that I may have led a number of you astray at various points.

I have had more of an opportunity to think about the problem, so if you have
time
please come by office hours again today so that I can ensure that I get you all
back on the right path.  I'm very sorry I wasn't better prepared for that
problem.

-Carl



From srhall at MIT.EDU  Mon Apr  5 20:05:50 2004
From: srhall at MIT.EDU (Steven R. Hall)
Date: Mon, 5 Apr 2004 20:05:50 -0400
Subject: [Unified-mailman] Lecture S8 Mud is on the web
Message-ID: <29B2350F-875E-11D8-A9D0-000A956F082C@mit.edu>

Folks,

Mud from Lectures S8 is now on the web at

http://web.mit.edu/16.unified/www/SPRING/signals/

Steve Hall


From tao23 at MIT.EDU  Mon Apr  5 22:11:04 2004
From: tao23 at MIT.EDU (Jordan McRae)
Date: Mon, 05 Apr 2004 22:11:04 -0400
Subject: [Unified-mailman] Computer Problem advice
Message-ID: <5.2.1.1.2.20040405215707.015a5818@po12.mit.edu>

Hopefully by now you've realized most of this but theres a few things you 
should keep in mind when using JK's Test program.  Many of you seem to be 
creating a program that will insert a node into a pre-sorted doubly linked 
list.  However, what JK has given you is NOT  doubly linked list.  Two 
options you have to get around this are thus:

1.)  Change the Add_to_Front and Initialize procedures so that they work 
for and create a doubly linked list.  (This should be fairly simple...the 
hardest part should be what order the Head, Tail, prev, and next pointers 
should be set)

2.)  Make your own insert procedure dynamic enough to add nodes to a 
existing AND empty doubly linked lists.  This code will essentially replace 
add to front and you won't need the pre-sorted list that is given to you in 
JK's code.

Of course with any programming assignments, there are probably many other 
ways to do this...these are just a few simple suggestions.   Hope this 
helps....

-Jordan McRae


From srhall at MIT.EDU  Tue Apr  6 07:58:54 2004
From: srhall at MIT.EDU (Steven R. Hall)
Date: Tue, 6 Apr 2004 07:58:54 -0400
Subject: [Unified-mailman] Gelb lab cleanup
Message-ID: <C6C4E6C5-87C1-11D8-A9F8-000A956F082C@mit.edu>

Folks,

There is a recurring problem in the Gelb lab (Unified study area). 
Walking through the Gelb lab this morning, I noticed that nearly every 
table had trash on it (problem sets, scratch paper, old cookie boxes, 
coffee cups, etc.). There was also trash on the floor throughout the 
study area. Most  of the identifiable material appears to be from 
Unified students.

Because the Gelb lab is our most public space, most visitors to our 
department will see this space, and the state it has been left in 
certainly leaves a bad impression. Note that the janitorial services 
will empty trash bins, but will not clear trash from tables. Therefore, 
it is up to you to remove trash when you are done using the study 
space. Please make sure that when you are done studying, you either 
take with you or throw away any material you used. If you are the last 
person to use a table, please clear that table and surrounding area of 
all remaining trash, whether it's yours or not. This small courtesy 
will go a long way toward keeping the Gelb lab a space that is pleasant 
to work in, and that we can be proud of.

Thanks,

Steven Hall


From howiek at MIT.EDU  Tue Apr  6 08:55:01 2004
From: howiek at MIT.EDU (Howard Kleinwaks)
Date: Tue, 6 Apr 2004 08:55:01 -0400
Subject: [Unified-mailman] using the CNC foam cutter
Message-ID: <v04020a02bc9858f7b5ee@[18.34.1.112]>

Students,
Before you use the foam cutter to cut wings, you need to have Col Young,
Carl, or myself show you how to do it.  The machine can be tricky at times.
-Howie

From howiek at MIT.EDU  Tue Apr  6 11:57:10 2004
From: howiek at MIT.EDU (Howard Kleinwaks)
Date: Tue, 06 Apr 2004 11:57:10 -0400
Subject: [Unified-mailman] Staple or Paper Clip your turn-ins
Message-ID: <5.2.1.1.2.20040406115621.00bb7520@po14.mit.edu>

Students,
You need to make sure that if you have multiple pages for a homework 
problem that they are stapled or paper clipped together.  Otherwise, they 
may get lost and we will not be able to give you credit.
-howie


From chipd at MIT.EDU  Tue Apr  6 12:21:08 2004
From: chipd at MIT.EDU (Carl C Dietrich)
Date: Tue,  6 Apr 2004 12:21:08 -0400
Subject: [Unified-mailman] SP8
Message-ID: <1081268468.4072d8f403194@webmail.mit.edu>


Students,

Apparently there has been some confusion about the due date of this SP.  It is
due this Thursday (as was anounced in last Thursday's lecture).  The date on
the downloaded file is incorrect because of the reshuffling of the SPs to
accomodate next week's Signals lab.

The motor test rig should be available by this evening for prop testing.  Please
plan accordingly.

-Carl

From howiek at MIT.EDU  Tue Apr  6 15:05:51 2004
From: howiek at MIT.EDU (Howard Kleinwaks)
Date: Tue, 06 Apr 2004 15:05:51 -0400
Subject: [Unified-mailman] Fwd: unified static test rig - open for business
Message-ID: <5.2.1.1.2.20040406150456.00bb3650@po14.mit.edu>

Students,
The test rig that you need to use for SP8 is now operational.  The props 
that you need to test are in the red bin next to the rig - please leave 
them there when you are finished.  If you have any questions, please ask.
-Howie

>X-Sieve: CMU Sieve 2.2
>Date: Tue, 6 Apr 2004 14:45:26 -0400
>To: howiek at mit.edu, chipd at mit.edu, ccoleman at mit.edu
>From: Pete Young <pwyoung at MIT.EDU>
>Subject: unified static test rig - open for business
>X-Spam-Score: -10.2
>X-Spam-Flag: NO
>X-Scanned-By: MIMEDefang 2.28 (www . roaringpenguin . com / mimedefang)
>
>Howie, Carl, and Prof. C.:
>
>The Unified static test rig is open for testing. It's located in the Gelb 
>glassed in office across from the entrance to the instrumentation shop. 
>Some hints, tips, and pointers:
>
>1. SAFETY IS PARAMOUNT as the propellers are turning quite rapidly. BE 
>SURE TO AVOID GETTING STRUCK by the propeller when it's running.
>2. The test rig has been simplified from previous years when a transmitter 
>and receiver were required. With the exception of the main battery 
>connector, no other connectors need to be disturbed.
>3. To use:
>a) install a charged 8 cell pack - the same packs as used for flying.
>b) turn the on/off switch to 'on' - it's tie-wrapped to the horizontal 
>beam so may be hard to find the first time.
>c) on the readout box marked "Radio South", the PWM indicator should be 
>lit and indicating the pulse width. Rotate the rotary knob fully CCW to 
>reset the electronic speed control.
>d) Rezero the electronic scale so it reads 0.
>e) Rotate the Radio South box's knob CW to activate the motor. On the 
>smaller readout box, you'll read current, voltage, and watts.
>f) To read motor speed, the room lights have to be dimmed in order to use 
>the optical tachometer. Shine the flashlight so that the light reflects 
>off the propeller disc and into the tach's optical sensor. Reasonable RPM 
>values are between 2000 and 8000 rpm. Be sure that the tach is set to the 
>2 propeller setting (look at the icon in the readout gauge).
>
>Col Young
>--
>Peter W. Young, Col., USAF (ret.)
>Senior Lecturer
>Director of CDIO Initiatives
>phone: (617) 253-5340, fax (617) 253-4002
>
>Massachusetts Institute of Technology
>Department of Aeronautics and Astronautics
>77 Massachusetts Ave., 33-240
>Cambridge MA 02139


From iaw at MIT.EDU  Tue Apr  6 22:12:59 2004
From: iaw at MIT.EDU (Ian Waitz)
Date: Tue, 6 Apr 2004 22:12:59 -0400
Subject: [Unified-mailman] P2 mud responses
Message-ID: <p05200f07bc99140119e5@[10.0.1.3]>

P2 mud responses are available at:

http://web.mit.edu/16.unified/www/SPRING/propulsion/Mud/P204mud.html

See you on Friday,

- Ian
-- 
*******************************************************************
M A S S A C H U S E T T S  I N S T I T U T E  O F  T E C H N O L O G Y

Ian A. Waitz
Professor and Deputy Head
Department of Aeronautics and Astronautics

Bldg. 33-207, MIT                  			Phone: 617-253-0218
77 Massachusetts Avenue 			Fax: 617-258-7566
Cambridge, MA 02139-4307			email:iaw at mit.edu

website: http://web.mit.edu/aeroastro/www/people/iaw/bio.html



From howiek at MIT.EDU  Wed Apr  7 15:15:43 2004
From: howiek at MIT.EDU (Howard Kleinwaks)
Date: Wed, 07 Apr 2004 15:15:43 -0400
Subject: [Unified-mailman] guides for submitting algorithms
Message-ID: <5.2.1.1.2.20040407150530.00bdcb38@po14.mit.edu>

Students,
During the grading of your CP problems, we noticed that some of you are 
having problems with your algorithms, or with knowing what we expect from you.

Here's what we expect:
Your algorithm should be detailed enough such that a code monkey from 
course 6 can take your algorithm and sit down and code it up, without your 
being there to answer questions.  What this means is that you need to 
explain all procedures, functions, and sub-procedures.
For instance, in the palindrome problem of CP2_4, you could not simply say 
that you would "reverse the string here".  Rather, you need to explain how 
you would reverse it:

Reverse String:
Get length of string using Get_Line;
starting there, use a reverse for loop to read in all the letters into a 
separate string;

Algorithms are not code, and should be written BEFORE you code, in a 
combination of English and pseudo-code.

-Howie


From ccoleman at MIT.EDU  Wed Apr  7 17:50:28 2004
From: ccoleman at MIT.EDU (Charles P Coleman)
Date: Wed, 7 Apr 2004 17:50:28 -0400
Subject: [Unified-mailman] RE: Payload loading
In-Reply-To: <002201c41ce5$6ba265b0$92052212@COMPY>
Message-ID: <BEEMIDHJNJCMLELHFODHGEALEKAA.ccoleman@mit.edu>

Shams-
You will be given the egg(s) at check-in when you arrive - before you start
flying! You will hand them back to us after flight for inspection!
Hope this helps!
Best-
Charles

-----Original Message-----
From: Shambhavi Kadam [mailto:skadam at MIT.EDU]
Sent: Wednesday, April 07, 2004 5:15 PM
To: Charles P Coleman
Subject: Payload loading


Hey Prof-

When exactly will we be given the eggs? During the first landing, or before
we start flying (please let it be this one)?

-Shams




From ccoleman at MIT.EDU  Thu Apr  8 09:23:40 2004
From: ccoleman at MIT.EDU (Charles P Coleman)
Date: Thu, 8 Apr 2004 09:23:40 -0400
Subject: [Unified-mailman] blade angles 
In-Reply-To: <5.1.0.14.2.20040407185717.0486ed30@hesiod>
Message-ID: <BEEMIDHJNJCMLELHFODHCEAMEKAA.ccoleman@mit.edu>

Denny-
I believe that we have the data sheets somewhere. I'll check with Col Young
this morning and try to get the data to you all by e-mail.
Best-
Charles

-----Original Message-----
From: Denny L. Reyes [mailto:falcon83 at MIT.EDU]
Sent: Wednesday, April 07, 2004 6:59 PM
To: ccoleman at mit.edu; chipd at mit.edu
Subject:


Professor Coleman...
How can we measure the propeller blade angle of the propellers we have...or
do you guys have data for the blade angles of the different props...or do
we need to measure the blade angle ourselves?
Denny




From chipd at MIT.EDU  Thu Apr  8 12:03:41 2004
From: chipd at MIT.EDU (Carl C Dietrich)
Date: Thu,  8 Apr 2004 12:03:41 -0400
Subject: [Unified-mailman] Reminder: Submit 2 copies of SP8
Message-ID: <1081440221.407577dd5fe93@webmail.mit.edu>


Students,

Please do not forget to submit 2 copies of your SP8 writeup today.

Thanks!

-Carl

From ccoleman at MIT.EDU  Thu Apr  8 15:49:34 2004
From: ccoleman at MIT.EDU (Charles P Coleman)
Date: Thu, 8 Apr 2004 15:49:34 -0400
Subject: [Unified-mailman] blade angle calculation
In-Reply-To: <5.1.0.14.2.20040407185717.0486ed30@hesiod>
Message-ID: <BEEMIDHJNJCMLELHFODHKEBBEKAA.ccoleman@mit.edu>

Denny-
Just to be clear, from knowledge of the pitch and diameter you can calculate
the blade angle (aka beta angle) using the relations given in the middle
column on page 100 of the Sailplane and Electric Modeler article, "Prop
Design from the Hub Out". I hope this helps!
Charles

-----Original Message-----
From: Denny L. Reyes [mailto:falcon83 at MIT.EDU]
Sent: Wednesday, April 07, 2004 6:59 PM
To: ccoleman at mit.edu; chipd at mit.edu
Subject:


Professor Coleman...
How can we measure the propeller blade angle of the propellers we have...or
do you guys have data for the blade angles of the different props...or do
we need to measure the blade angle ourselves?
Denny




From chipd at MIT.EDU  Sat Apr 10 09:26:15 2004
From: chipd at MIT.EDU (Carl C Dietrich)
Date: Sat, 10 Apr 2004 09:26:15 -0400
Subject: [Unified-mailman] Fwd: unified aircraft d/b/f supportability
Message-ID: <1081603575.4077f5f78e137@webmail.mit.edu>



----- Forwarded message from pwyoung at ix.netcom.com -----
    Date: Sat, 10 Apr 2004 07:27:42 -0400 (GMT-04:00)
    From: pwyoung at ix.netcom.com
Reply-To: pwyoung at ix.netcom.com
 Subject: unified aircraft d/b/f supportability
      To: ccoleman at mit.edu, howiek at mit.edu, chipd at mit.edu

Prof C., Howie, Carl, here's some items FYI and to pass to the Unified
students:

- CNC cutter - is still behaving erratically but seems to have stabilized, i.e.
isn't getting
worse. The best strategy to get acceptable wings without wasting time, getting
frustrated,
etc., is to do the foam cutting with supervision.  There's no plans at present
to have
weekend support but there will be time available next week if arrangements can
be made
in advance; contact Col Young as needed.
- Additional propellers. A new supply of 7" and 8" propellers, designed for the
S-400
motors, has arrived and have been put into the labelled storage bins down by
the
battery charging area. Please do not take too many props and deprive others!
- Propeller adapters. To install these propellers, an aluminum propeller adapter
needs
to be installed to the motor's 2.3 mm shaft using a very specific sized Allen
wrench. This
size wrench is hard to replace if misplaced. We'll have the adapters and a
marked wrench available down by the "community property" area adjacent to the
AIAA student officer's glassed in office (closest to the instrumentation lab) in
the basement.
- 350 mah batteries. The batteries that will be used for the competition, 350
mah packs
(and not the larger 600 mah packs used to date) have been put down in the Gelb
for use
when charged. These should be charged at the 40 mah rate on the multi-chargers.
- Additional balsa wood. 1/16" and 3/32" wood has been bought and put into the
balsa
storage boxes close to Don Weiner's office.

Col Young

----- End forwarded message -----




From srhall at MIT.EDU  Sat Apr 10 15:17:38 2004
From: srhall at MIT.EDU (Steven R. Hall)
Date: Sat, 10 Apr 2004 15:17:38 -0400
Subject: [Unified-mailman] Lecture S9, S10 Mud is on the web
Message-ID: <BB04EEC6-8B23-11D8-AFD4-000A956F082C@mit.edu>

Folks,

Mud from Lectures S9 and S10 is now on the web at

http://web.mit.edu/16.unified/www/SPRING/signals/

Steve Hall


From iaw at MIT.EDU  Sat Apr 10 17:20:17 2004
From: iaw at MIT.EDU (Ian Waitz)
Date: Sat, 10 Apr 2004 17:20:17 -0400
Subject: [Unified-mailman] P3 mud responses
Message-ID: <p05200f00bc9e156eb896@[18.34.1.145]>

P3 mud responses are available at:

http://web.mit.edu/16.unified/www/SPRING/propulsion/Mud/P304mud.html

- Ian
-- 
*******************************************************************
M A S S A C H U S E T T S  I N S T I T U T E  O F  T E C H N O L O G Y

Ian A. Waitz
Professor and Deputy Head
Department of Aeronautics and Astronautics

Bldg. 33-207, MIT                  			Phone: 617-253-0218
77 Massachusetts Avenue 			Fax: 617-258-7566
Cambridge, MA 02139-4307			email:iaw at mit.edu

website: http://web.mit.edu/aeroastro/www/people/iaw/bio.html