Engineering consultant - ask me anything

H

Hazin'

New Member
Greetings fellow internet occupants.

I have recently come to the conclusion that the majority of my spare time should go to empowering the Proliferation of Cannabis. Throughout my world travels, one thing has become apparent: The corruption and costly slander surrounding authority with regards to jurisdiction and government control of cannabis is absolutely unjustified and illogical.

So, i hereby vow to pledge my skills to anyone in need.

I am well versed in structural engineering, applied mathematics,rocket propulsion science, statistics... the list goes on. A majority of my (now, unfortunately fading) life has been dedicated to the pursuit and understanding of the previous subjects.

I will keep it simple. Ask me anything

Almost every post i cruise past on this site, unfortunately, has inaccuracies biased towards a "quick-and-easy" answer. Power consumption, light spectrum, emissivity, diffusivity, molar concentration, chemical reactions, grow-room setups, pressure, humidity, structural integrity,and many, many other subjects have all been marred and scarred by such hasty folks to get their "opinion" out there. I am not a "big fan" of 14 year old kids who can't spell correctly telling others to just "vaccum seal their stash" to make it undetectable on a bus ride, for example.


I will provide references and explanations centered around the undeniable logic of mathematics to anyone who would like clarification to posts with mixed feedback or answers. My best efforts will go towards enlightening the internet once more with critical analysis and cold, hard, facts.


Theodore Roosevelt praised the Strenuous Life.
Do not pray for an easy life, pray for the strength to endure a difficult one. As my body fails me my mind must prevail. Please ask me a question or two, I have so much to give yet nowhere to start with it all.



thanks for your time




BLAZIN
HAZIN':leaf:
 
ok, i've a serious question. What size of joist would I need to support a 4 inch slab of concrete? And at what spacing? Span would be approximately 20 feet. Putting posts in the center @ ten feet is not out of the question.

always dreamed of having a fully underground gro under a garage or something.
 
I am a systems engineer, does that count as an engineer, or is it just a title I use to make up for the low self esteem issues I have.
 
joe macclennan said:
ok, i've a serious question. What size of joist would I need to support a 4 inch slab of concrete? And at what spacing? Span would be approximately 20 feet. Putting posts in the center @ ten feet is not out of the question.

always dreamed of having a fully underground gro under a garage or something.
Click to expand...

And would this configuration negate the requirement for ufer grounding the slab?
 
Hi Hazin! I've got something for ya to chew on :mrgreen:

I would like like a design for a super-critical CO2 extraction device that could be manufactured for under $500 or so please. Capacity of the extraction chamber would be relatively small for hobby growers. Automated controls would be nice, so's we don't blow nobody up. Here's CO2's phase diagram. Thanks a bunch :-)
 

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Is your real name redvegga, doritios, etc or something. you were here already and got laughed at and made a new name. as I engineer you come this this site and t
You know everything about pot. You mentioned a post I commented in about getting on a bus and taking weed etc. How would you transport weed on a public transit such as a greyhound bus etc.How would you do it.
 
joe macclennan said:
ok, i've a serious question. What size of joist would I need to support a 4 inch slab of concrete? And at what spacing? Span would be approximately 20 feet. Putting posts in the center @ ten feet is not out of the question.

always dreamed of having a fully underground gro under a garage or something.
Click to expand...


I dont think hes he's gonna answer. Lol

It would depend on what will be placed on the concrete slab now or at any conceivable point in the future. Once you know that load, it's pretty easy math..... but there are programs that do this stuff for you nowadays...
 
steelheadguy said:
My Eco-smart wall mounted oscillating fan's motor is noisy. I bought it used. How can I make it more quite?
Click to expand...

I noticed the same thing, my oscillating fan is 44 watts on low and it moves plenty of air but makes quite a racket. So I figured maybe a ceiling fan. The ceiling fan takes 55 watts on high but is near silent. I bought a bunch on craigslist and it turns out some are better than others. Works great for an 8X8 tent just watch your head.
 
Bubbagineer said:
I dont think hes he's gonna answer. Lol

It would depend on what will be placed on the concrete slab now or at any conceivable point in the future. Once you know that load, it's pretty easy math..... but there are programs that do this stuff for you nowadays...
Click to expand...

doesn't look like it.

well, it could conceivably have a mid size suv parked on it. So around two tons give or take.

Not like i'm gonna run right out and do this. Just looking to get some thoughts on the idea.

I was thinking using 2x12 @ 16" centers spanning ten feet would be plenty. Probably overkill really.

also using 2x12 vs. engineered trusses or steel trusses would be easier for me and one guy to handle as this would most likely be a covert project. I couldn't exactly hire a crew to come in and do it.
 
Hello all!

I have been away on business for a bit. But, just so you know, i am giving all of your questions serious and mature explanations, with diagrams. Hang in there!!

PEACE
HAZIN:leaf:
 
To address the "Noisy Fan" issue:

First let's go ahead and look at the general schematic of a wall fan. Straightforward A/C motor stepping out a nominal amount of torque to a few fan blades, blade configuration does not matter in our analysis YET.

Here is the first document i examined to glean a bit of background info on the general installation of an eco-smart fan

http://nuaire.info/IandM/671114.pdf

where the following quote stands out to me as something you should have considered:

"Because the run and start currents depend upon the duty and
associated ductwork of an individual unit, run currents will be
exceeded if the unit is operated with its cover removed. It is
therefore recommended that the unit is not run for prolonged
periods in this condition."

Thus our question first requires more Description to pinpoint. I'm sure you are supplying it with standard outlet power, so we must first look at pipe losses and net pump suction head and pressure head losses.


1.. (noisy when not installed)
If the fan makes the noise without anything attached, it is likely an electrical problem that would require a bit of disassembly of "car-talk" style descriptions to allow me to troubleshoot your impeller motor.

2.. (only noisy when installed)
If i may ask sir, what is the approximate LENGTH, DIAMETER, and ducting material used to route your fan-driven air? Please include both the INTAKE side and OUTLET sides, as they both contribute to what is fluid mechanics would call "pipe loss."

2. Answering 2 is pretty simple.

Obviously, if you have more twists and turns in your ducting setup, and it is longer, there is more energy loss against the sidewalls of the interior of the ducting. A fluid is non-moving at the surface of the ducting, whereas the dead center of the pipe in a straight flow will have the maximum airflow. Imagine sucking honey through a crazy straw versus a short fat straw. Nothing too complicated... Your motor is working too hard. Shorten and straighten your tubes.

As a general principle, fluid mechanics is simple. All fluids do is follow rules. Know the rules, understand the system. Here is some reading material that begins to address what i am speaking of. If it is too mathy or hexing to you, don't worry. Just look at the pictures, understand what the Reynold's number is ( a non-dimensional quantity generally associated with pipe flow that is a judge of whether the fluid in a pipe is flowing smoothly or randomly and turbulent)... I can answer any question you have about this stuff but it's probably not worth teaching a fluid mechanic course on a forum post, lol.

http://www.cs.cdu.edu.au/homepages/jmitroy/eng243/sect09.pdf

Let me know if it is an electrical problem otherwise..

BLAZIN!
HAZIN!:leaf:
 
JohnDee said:
I want a ganja powered rocket to take me to another planet....
JD
Click to expand...


Interesting you should say that because, in all honestly, FUEL is what drives a majority of the complications associated in explicitly substantiating a missile or rocket's GAG (ground-air-ground) flight cycle.

I laugh at all of the sciency-techy posts that emerge on the internet today, glorifying the large cruisers of Star Wars and Star Trek, claiming that it will happen.

In all actuality, the first law of thermodynamics ultimately shuts down these claims, because no amount of fuel exists with the proper energy/weight ratio to actually physically propel any amount of mass even close to a large structure out to space.

There was a study conducted by NASA in 1978 i believe, just after the glorious TM-X-73305 Astronautic structures manuals were released, that conducted a more focused feasibility study of the following question: "with what energy we have that is a transportable fuel currently on the earth, how much crap could we launch into space?"

The answer was depressing.

so i stay BLAZIN

HAZIN:leaf:
 
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