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Topic Review (Newest First)
10-01-2012 10:00 AM
Blind Dog kips is just engineering-ese for kilo-pounds =1000 lbs/kip.
They gave the formula as yield strength x rod area/factor of safety, but the intro gave 36 kips yield strength per rod...weird.

Anyway, sorry to get off-topic.
Like 90DesertTanYJ wrote---that's how I back out of my driveway without rolling, too. The part where I park the Jeep is pretty steep. If I park down on the flat part, I block my wife's car who parks in the garage. (My Jeep is just about 4 inches too tall to fit in the garage, so I'll get to scrape frost all winter.)
10-01-2012 09:40 AM
physicscholar
Quote:
Originally Posted by Blind Dog View Post
I'n down with FBDs; the issue is with problems like this:
Like where does the 250 come from in solving with the ultimate strength approach (step 8)?
And even an example in the book, they threw 50ksi yield strength into the equation but it was never a given in the problem. It's like these geeks are deliberately trying to withhold information. Jeez.

3 x pi/4 x (0.5)^2 x 250 = 147.262 kips
Thatís lovely, and I get it except for the 250. Came from nowhere.
ok, this is beyond anything I have done, but ... follow the units. As far as I can tell that 250 has to have units of kips (whatever those are). And you said the example problem threw in 50kips. So it is either a constant that you don't realize or it is somehow derived from the question (three steal bars at 75 each?).
09-30-2012 12:34 PM
90DesertTanYJ After boat is on trailer and fastened down, with Ebrake set, go ahead and ease out on the clutch giving it gas until the Jeep is straining against the Ebrake. Keeping on the gas, release the Ebrake and off you and the boat go.
09-28-2012 08:50 PM
Blind Dog I'n down with FBDs; the issue is with problems like this:
Like where does the 250 come from in solving with the ultimate strength approach (step 8)?
And even an example in the book, they threw 50ksi yield strength into the equation but it was never a given in the problem. It's like these geeks are deliberately trying to withhold information. Jeez.

3 x pi/4 x (0.5)^2 x 250 = 147.262 kips
Thatís lovely, and I get it except for the 250. Came from nowhere.




09-28-2012 12:01 PM
physicscholar
Quote:
Originally Posted by BigRedDog02 View Post
FREE BODY DIAGRAMS!!!! Use them and understand them.
He is right, you have to use free body diagrams. And don't forget the normal force!! I don't know how many times I had to beat that into my students.
09-28-2012 09:40 AM
BigRedDog02
Quote:
Originally Posted by Blind Dog View Post
You should be cool with a 3500 lb capacity 4 door. I don't know what the trailer weighs, a few hundred I guess. I stick is more funner, but you may get tired of it if it's your daily driver.

(I think everyone's statics is crap except for the text writers who seem to pull certain numbers out of their asses without explanation.)

FREE BODY DIAGRAMS!!!! Use them and understand them.
09-27-2012 09:45 PM
Blind Dog You should be cool with a 3500 lb capacity 4 door. I don't know what the trailer weighs, a few hundred I guess. I stick is more funner, but you may get tired of it if it's your daily driver.

(I think everyone's statics is crap except for the text writers who seem to pull certain numbers out of their asses without explanation.)
09-27-2012 01:31 PM
physicscholar Our boat and engine is only about 1,800 lbs, so technically the 2 door would work according to published limits, but to be on the safe side we are going with the 4 door model. I think it is easier to get stuff out the back seat (dogs and supplies) with the extra set of doors.

I never did a materials class and my statics was crap, sorry.
09-27-2012 08:59 AM
Blind Dog Welcome to the forum!

Funny I just posted by coincidence, a new thread asking if anyone knew how many auto vs manuals are sold nowadays...just curious.

Personally, I like both types for different reasons (and modern automatics are better and more versatile than they've ever been), but prefer towing with an auto.

However, the Wrangler, generally speaking, isn't the best towing vehicle. At least the 2-door version, because of the short wheelbase is not rated all that high for towing capacity. How big and heavy is the boat and trailer compared to the rating of what you are thinking about buying?

Edmunds.com has a pretty good features and specs section for vehicles so you can look up stuff like this.

(Now, physics scholar, can you help me with a class test problem I'm stuck on in Statics and Strength of Materials? )

-Rob
09-27-2012 08:40 AM
physicscholar
Manual or Automatic?

We are looking into getting a new towing vehicle and thought a Wrangler would be perfect for us. We want to be about to tow our boat with it, and go blasting around with the top down too. Though not necessary at the same time.
While I can drive a stick, I am used to automatics as of late. We are getting offered a really good deal on a manual, but Iím not sure how I am going to be with that on the boat ramps (they are pretty steep in our town).

And suggestions from those more experienced?

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