Engineering - August 2006

Is it propellers? Paddles? Mississippi-Steamer type wheels? Some bionic design, emulating penguin's feet? I'm trying to find the implement which will translate the highest percentage of the horsepower I produce with whatever means (muscle power, electric motor, diesel, who knows) into propulsion in the water.

It's for a boat project. I want to build my own boat, and I want to build the most efficient, possible drivetrain for it.

Thanks!

2006-08-31 20:27:22 · 8 answers · asked by Tahini Classic 7

What does the programming hardware physically do to the PIC IC? How does the PIC know what your telling it to do?

2006-08-31 19:55:27 · 3 answers · asked by Anonymous

I am unfamiliar with English units. What is the relationship between pounds-mass and pounds-force?

If, say, you were to calculate a force needed to accelerate a tank or something and the weight (pounds-force) was known, you would simply divide by the gravity acceleration (32.2 ft/s^2) to know the pounds-mass?

2006-08-31 19:12:45 · 4 answers · asked by soymilk 2

2006-08-31 18:11:18 · 2 answers · asked by goku 1

2006-08-31 17:50:32 · 1 answers · asked by dhruv 1

WHY?????????

2006-08-31 16:02:01 · 6 answers · asked by The Apostle 2

I don't have AutoCad (too expensive) and I have very limited access to it. However I am an engineering student and want to know if there is any way to learn AutoCad without the program.

2006-08-31 15:36:16 · 9 answers · asked by Wocka wocka 6

2006-08-31 12:40:42 · 3 answers · asked by Jong-su 1

If every old refrigerator in the state vented a charge of R-12 simultaneously, what would be the decrease in the ozone layer?

2006-08-31 12:31:52 · 2 answers · asked by Giggly Giraffe 7

will they be dismantled? scrapped? stored? sold to other countries?

2006-08-31 12:12:59 · 9 answers · asked by j b 1

I think there is. I wached someting about the Stealth bombers invisibility to Radar. Because, the waves just break up after hitting it. Due it's angular design. But, isn't it possible to hear it coming. Using somekind of modified sonar technology or maybe it can be seen with specially positioned infrared telescopes ?

2006-08-31 11:53:42 · 12 answers · asked by sandwreckoner 4

The large steel rotunda that appear to drop as the gas is used. Do they have a water seal?

2006-08-31 11:38:20 · 2 answers · asked by Tulpamemnon 1

The irish have a reputation for being 'Thick' (hence the Irish jokes)
however, most of the Irsh people I have met have a far above average IQ. If this invention proves to be a disaster I can see the humiliation the irish people will go through so wonder if it was a good idea for the inventor to come out with the idea until it had been assesed and tested by the recognised authority.

2006-08-31 11:16:19 · 22 answers · asked by Redmonk 6

Hello all,

I need to get a small electronic device (gathers weather data) into the air 1200+ ft and then have it slowly parachute down to collect data. A weather balloon won't work because it is too slow moving as it ascends and will deviate its path based on wind/rain conditions. It can't have a small rocket engine (no ordinates allowed) and would preferably not need a person to man it, i.e. an RC plane/helicopter would need a pilot on the ground. I am running out of options and hoped some people with more experience could offer up some suggestions. Any ideas are much appreciated! Thank you!

2006-08-31 11:13:04 · 10 answers · asked by sintheticmedia 2

I think so. They should bring back the Twin Towers. Maybe make them taller and resistant to airplane attacks. We should not allow terrorists to redesign our skylines. By building nearly identical Twin Towers, although it may be a bit eerie and haunting at first, it would send a message to terrorists that they have no lasting impact on America.

2006-08-31 11:05:02 · 5 answers · asked by FrozenCloud 3

2006-08-31 09:58:28 · 1 answers · asked by riccionea 1

hey i want to create a touch sensor
a light sensor
if you don't have the correct answer please don't answer
please give the correct directions give the best and i give you ten pionts

2006-08-31 09:38:24 · 3 answers · asked by mike 1

I thought of this great idea to make a car that runs on solar powered steam. My friends say it wont work... Why?

2006-08-31 09:27:09 · 11 answers · asked by xavierwold 2

I will be controlling the inputs of these XORs directly from a PIC
output, both PIC and Logic powerd from the same regulated +5V. I have
two choices:

ST's Single XOR 74V1G86STR in a SOT23-5L
http://www.st.com/stonline/books/pdf/docs/5735.pdf

OR

Fairchilds Tinylogic UHS Single XOR NC7SZ86M5X in a SOT23-5L
http://www.fairchildsemi.com/ds/NC/NC7SZ86.pdf

They are both astonishingly similar:
both have a VIH minimum of .7 @ 5V
both have a VIL maximum of .3 @ 5V

The Tinylogic can provide up to -+ 24mA at output
The ST can provide a minimum of 8 mA at output

The XOR's output is directly connected to the two Reset pins on a 556.
Hence when the XOR goes high, the 556 begins oscillating. When the XOR
output goes low, the 556 goes back down to outputting 0V.

2006-08-31 08:49:00 · 5 answers · asked by Anonymous

Tesla is widely cited as inventing an efficient AC electric motor, but did he also invent AC current?

2006-08-31 08:27:22 · 12 answers · asked by Anonymous

using electric motor via shaft to gear system (worm gear or screw gear)

2006-08-31 06:53:54 · 3 answers · asked by Opeyemi A 1

He is a business magnet.

2006-08-31 06:08:38 · 4 answers · asked by vivimera 2

How too set-up a water pump system from river.

2006-08-31 05:48:09 · 1 answers · asked by Loren D 1

2006-08-31 05:36:09 · 2 answers · asked by Anonymous

precise answers,websites needed

2006-08-31 05:04:00 · 6 answers · asked by Anonymous

We live at the top of a hill at we can't use any electronic device that has a speaker (or its equivalent) because of the constant interference of a radio station, or other sources.

2006-08-31 05:01:30 · 3 answers · asked by ozauary 1

2006-08-31 05:00:51 · 3 answers · asked by Anonymous

i am now making a bicycle trailer and some parts requires a joint. i am using stainless steel pipes . it is very hard to cut out a 45 degree angle on a pipe- i know it is easy on a flat surface. does any body knows how to cut out a 45 degree off a stainless steel pipe with a diameter of 4 cm ? or is there another solution that will work the same?

2006-08-31 04:54:23 · 10 answers · asked by 47 2

2006-08-31 04:50:53 · 7 answers · asked by concepts_engineering 1

I am working in an engineering company and would like to order quality cotton gloves for workmen. However, I could not find any standard for this thing in the world wide web.

2006-08-31 04:10:09 · 2 answers · asked by man with lots of question 1