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Optimal speed for gas mileage |
Posted by: Darth-Apple - August 29th, 2017 at 3:25 AM - Forum: General Discussion
- Replies (1)
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Most people say around 55-65 MPH is best as far as fuel efficiency is concerned. It's certainly true that going faster dramatically decreases your gas mileage, particularly over the speed of 70. Most people blame the transmissions and say they need deeper overdrive gears, and while the transmission makes a huge difference, most new cars do in fact have very deep overdrive gears, and the mileage still dips considerably as you approach the speed of normal traffic on your typical freeway. Turns out that the wind drag makes a pretty significant difference all on its own, and I decided to put a lot of that to the test in my new ride.
My 2007 jetta, 5 cylinder 2.5 liter is pretty nice. Snagged another steal on it and paid 2400 for it with 60K miles, and it's clean inside and out with no mechanical issues whatsoever. EPA claims it gets around 19 MPG in the city and 28 on the highway.
Granted, I have yet to own a single car yet where I didn't exceed the gas mileage estimates. I don't necessarily drive like I'm in the Indy 500, but I don't drive like a grandma either, so I'm a little pleasantly surprised by this. In the city, I do generally average only around 20 MPG or so (a little better back home, usually closer to 23). But on the highway, rolling at 70 MPH or so, I get about 30-32 easily, sometimes a hair better. A noticeable amount better than the EPA's estimates, and without dipping down to an unreasonably slow speed.
It's a small sedan, and most compact cars do a little better than this, but for a car that isn't specially designed with fuel-economy in mind, 18-20 in the city, 30-32 on the highway isn't bad and is definitely liveable. But for a car that's the same size as my corolla, I wanted to see how far I could push it.
I noticed that around 50-52 MPH or so, my mileage was a good bit better than I expected, and even in the city (if I was driving at a good time and didn't hit a lot of red lights), my mileage was actually a little better than it was on the freeway. Turns out that around this speed in my jetta, it will easily average about 36-38 MPG. Took it out on the open freeway and put it in cruise control at about 55-60 MPH or so in the evening, got about 35 miles to the gallon. Not bad at all for a 2.5 liter engine that's only rated for 28 MPG on the highway.
Did a little quick research, and it turns out there's an explanation for this, despite the super deep overdrive gears in most newer cars. Wind drag is basically the result of your velocity/speed squared. So increasing speed from 70 and going up to 85 miles per hour increases your wind drag by around 33% alone. Based on those calculations, my car would only get about 20 MPG or so roaring at 85 MPH. I can get away with that easily in my civic and still not dip below 30 MPG, but in my Jetta, I think I'll be staying below 70...
Interesting stuff indeed. EPA estimates can in fact be beat. And pretty easily at that.
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[Tutorial] DIY crossover modem cable |
Posted by: SpookyZalost - August 16th, 2017 at 10:11 AM - Forum: Resources & Tutorials
- No Replies
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what I'm about to present to you guys is a really old trick but handy if you've got some old computers that you either want to get on the internet or want to link without Ethernet, effectively allowing you to dial into them in the same way you used to dial into an ISP.
now there's a couple things you need to know, first of all you're going to need to generate a line voltage on the phone cable, this is normally handled by the normal setup with the phone company but since you aren't dialing out of your house it's something to work around.
some modems actually can generate this for you so a bit of research is needed but most PCI/ISA/PCI-E etc modems are software based and only have the hardware required to send data.
Your Mileage May Vary.
second thing to know is that your data limit will be based on the slowest modem on the link, 33K or more is fairly standard though.
now that the basics are out of the way here's a couple circuits which you will need to splice into your modem to modem RJ11 (phone cable), cable.
the supplies to construct them are as listed
- Telephone cord ( straight... about 10 or 15 feet ( 3 1/2 meters ) )
- Capacitor ( .47 �FD - 1 �FD Electrolytic (Very Important))
- Resistor ( 330 ohms - 390 ohms )
- 9V battery snap connector(standard or heavy duty)
I say go with the heavy duty snap connector because the connectors pull out too easily on the cheaper version
- 9V battery
- Utility knife ( 'Exacto' knife)
- Electrical tape or solder w/ soldering iron.
you'll need to construct one of these two the first being the least complicated.
Code: BASIC CIRCUIT
+ | | -
GREEN----------+---||||---/\/\/--+-------------RED
| | | R |
| 9 to 24V |
| |
+---||------------+
C .47uF
RED-----------------------------------------------GREEN
Note that the resistor value depends on the actual voltage used. For 24V about 1K Ohms max will give at most 24mA (12V @ 500 Ohms, 9V @ 380 Ohms); the resistance of the modem circuit will reduce this slightly (you may need to reduce the resistor value, but if it works with the values mentioned, leave it at that; I'm using 380 Ohms with a voltage input of 14V). The telephone company guarantees about 20mA minimum in an actual phone line, and we want to be about the same minimum. Note also that the battery shown can be replaced by a "wall wart" power supply; most of these are un-regulated (my "9V @ 130mA" plug in DC supply gives about 14V on this circuit when connected to a telepone for testing) and consequently will need an electrolytic capacitor of about 2200 uF across the power supply + and - terminals to reduce the "ripple" voltage (i.e., AC "noise"); be sure to match the polarity of the Electrolytic to the polarity of the power supply.
this second circuit has some extra stuff in case you end up using an unregulated power supply.
note that it includes a 12v regulator
Code: Better circuit, but more complicated 78L12 380 Ohm 1/2 Watt
_________
| |
+VDC IN >--------+-----|IN + |----+--/\/\/\/--+--------GREEN
+_|_ |___GND___| _|_ _|_
-DC IN >--+ _ _ | _ _ .1uF _ _ .47uF
| | 10uF | | |
RED----------+-----+----------+---------+-----------+
GREEN----------------------------------------------------------RED
In the circuits above, the 10uF is a Tantalum, but you can substitute electrolytic. The 0.1uF is ceramic, and the 0.47uF should be an audio grade bypass; I used a polypropelene capacitor here. Make sure the capacitors have voltage rating at least equal to the power supply you use; a voltage regulator needs at least two volts more at its input than its output, so the above needs at least 14 volts in. Most regulators will take up to about 30 volts max on their input, but the greater the differential, the greater the power loss and subsequent heat dissipation in the regulator. The 78L12 is designed for 200mA max, whereas the 7812 is about 1 to 1.5 A max (when used with an adequate heat sink (an aluminum "radiator" designed for this purpose).
here's an image of what your example should look like, this is the basic one listed above.
finally once you've built your crossover modem cable you'll need to setup your network enabled PC as a router for your incoming modem connections.
effectively what you want to do is set it up so that any information requests coming in via the modem output onto the network and then the internet.
the setup I use utilizes PPP protocol and IP tables under linux.
here's an example of the command you enter to set it up.
Code: pppd 115200 netmask $LOCAL_NET_MASK crtscts connect 'chat -v -f /etc/admin/network/winclient.chat' lock local ms-dns $LOCAL_IP ms-wins $LOCAL_IP persist proxyarp silent $PPP_IFACE_ADDRESS $TTY noauth
you will need to know your network router's information but I can confirm this works to use WIFI among other things, works with an old laptop to connect my 286 to the internet for example.
you will need to do some research on PPPD and setting up network passthrough, but once you're setup you only need to do it once.
an alternative to the above method would be to use the same software side code but use RS 232 serial ports with a crossover cable, though these are harder to find these days.
one last thing, if you want the easiest way to transfer files onto your older computer I highly recommend telnet, provided you set it up right and with some research you can setup a BBS based file server and telnet files from one computer to another, the server can even run off a flash drive, just make sure it knows where the downloadable files are.
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Your Cup of Tea? |
Posted by: Guardian - July 30th, 2017 at 3:24 PM - Forum: General Discussion
- Replies (3)
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Seeing as to how we went way off topic in the Hydration thread, right about here, it warranted enough to start another conversation.
So, let's have it. What's in your cup of tea?
Obviously there are tons of blends in each category, but if I listed them all we would be here for days. Vote for your favorite, then share your preferred blend if applicable.
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Technomancy |
Posted by: SpookyZalost - July 8th, 2017 at 8:11 AM - Forum: Current Events
- Replies (9)
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so... technomancy, literally Technological Diviniation if the name is to be translated correctly.
but basically, a mastery and knowledge of technology, usually information technology, to the point that the user seems to be performing magic.
would a technomantic wizard be someone who's just really good with tech or some sort of magic, or something else.
Thoughts?
personally I think it's someone who's transcended being a mere hacker to do really crazy stuff with technology.
people like ben heckendorn, Steve Wozniak, or some of the people out there who are really good at re-purposing things to do more than they were designed for if their technological knowledge is high enough anyway.
so yeah, what do you guys think? what separates a technomancer from a hacker/really skilled programmer?
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Makestation Play's Zork |
Posted by: SpookyZalost - June 28th, 2017 at 6:38 PM - Forum: Forum Games
- Replies (30)
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Hello Everyone and welcome to ZORK: The Underground Empire, the rules are simple.
once per day I will update the game log and map depending on the decisions everyone makes, Majority wins.
there will be an inventory list kept in the opening post.
note: not all posts are direct actions, so feel free to discuss what you think might be the best move to make next before the next action is picked.
the map will update as you explore.
Red dot = your position on the map
EDIT: if however no updates are made a random choice will be made, not all of them will progress the game.
Quote:LORE
a list of known information about objects, monsters, and places.
Mailbox: on the east side of the mysterious house.
Leaflet: found in the mailbox, says the following:
Quote:"WELCOME TO ZORK!
ZORK is a game of adventure, danger, and low cunning. In it you will explore
some of the most amazing territory ever seen by mortals. No computer should be
without one!"
Kitchen:
Quote:The kitchen of the white house. A table seems to have been used
recently for the preparation of food. A passage leads to the west and a dark
staircase can be seen leading upward. A dark chimney leads down and to the east
is a small window which is open.
Living Room:
Quote:The living room of the white house. There is a doorway to the east, a wooden door with
strange gothic lettering to the west, which appears to be nailed shut, a trophy
case, and a large oriental rug in the center of the room.
Quote:INVENTORY
- Leaflet
- Brown Sack with a lunch inside
- an elvish sword of great antiquity
- A battery-powered brass lantern
Quote:MAP
Let's begin
Quote:TURN 0:
ZORK I: The Great Underground Empire
Copyright © 1981, 1982, 1983 Infocom, Inc. All rights reserved.
ZORK is a registered trademark of Infocom, Inc.
Revision 88 / Serial number 840726
West of House
You are standing in an open field west of a white house, with a boarded front
door.
There is a small mailbox here.
TURN 1:
>open mailbox
Opening the small mailbox reveals a leaflet.
Turn 2:
>Read leaflet
(Taken)
"WELCOME TO ZORK!
ZORK is a game of adventure, danger, and low cunning. In it you will explore
some of the most amazing territory ever seen by mortals. No computer should be
without one!"
Turn 3:
>examine surroundings
West of House
You are standing in an open field west of a white house, with a boarded front
door.
There is a small mailbox here.
-
There's nothing special about the surrounding wall.
TURN 4:
>walk toward front door
It's here!
(door)
The door cannot be opened.
TURN 5:
>Walk to south side (to look for another door?)
South of House
You are facing the south side of a white house. There is no door here, and all
the windows are boarded.
TURN 6:
>east
Behind House
You are behind the white house. A path leads into the forest to the east. In one
corner of the house there is a small window which is slightly ajar.
TURN 7:
>Open window
With great effort, you open the window far enough to allow entry.
TURN 8:
>go through window
Kitchen
You are in the kitchen of the white house. A table seems to have been used
recently for the preparation of food. A passage leads to the west and a dark
staircase can be seen leading upward. A dark chimney leads down and to the east
is a small window which is open.
On the table is an elongated brown sack, smelling of hot peppers.
A bottle is sitting on the table.
The glass bottle contains:
A quantity of water
TURN 9:
>open sack
Opening the brown sack reveals a lunch, and a clove of garlic.
TURN 10:
>take sack
Taken.
TURN 11:
>west
Living Room
You are in the living room. There is a doorway to the east, a wooden door with
strange gothic lettering to the west, which appears to be nailed shut, a trophy
case, and a large oriental rug in the center of the room.
Above the trophy case hangs an elvish sword of great antiquity.
A battery-powered brass lantern is on the trophy case.
TURN 12:
>take all
trophy case: The trophy case is securely fastened to the wall.
sword: Taken.
brass lantern: Taken.
carpet: The rug is extremely heavy and cannot be carried.
>investigate area
nothing has changed,
Living Room
You are in the living room. There is a doorway to the east, a wooden door with
strange gothic lettering to the west, which appears to be nailed shut, a trophy
case, and a large oriental rug in the center of the room.
TURN 13:
>east
Kitchen
A bottle is sitting on the table.
The glass bottle contains:
A quantity of water
TURN 14:
>take bottle
Taken.
TURN 15:
>west
Living Room
you already have the sword in your inventory
TURN 16:
>Go Outside
Living Room
The Door cannot be opened, it appears to be locked or barred from the other side.
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