Correction for the record

[John Berger]

Well shucks... #ad
I have to post a correction. There was a topic not to long ago titled V10 outpulls Cummins. I posted some figures on a pull I did with my 10K travel trailer last spring on the grade on I-77 from the North Carolina border to Fancy Gap in Virginia. I stated that the grade was 9% and that I crested it in 4th gear at 62 mph. Well, the grade was only 6%, but all other figures are correct. Just wanted to be accurate and not tell to tall of a tale #ad
. The simple fact is, my stock truck smoked that grade. Presents under the tree were never better.

John

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1999 Dodge Ram 3500 Quad Cab 5 spd; 4:10 LSD rear; Mag-Hytec diff. cover; US Gear EGT and Boost gauges. Amsoil foam air filter and synthetics from nose to tail.
Cummins Power, don't leave home without it

 

[Alan Reagan]

I like an honest man #ad
. Thanks for letting us know. I have been trying to figure out since I read that what I needed to do to make my hoss run up a hill like that.

 

[Koa Man]

Thanks for the clarification John. I am still impressed with your truck! It is real easy to over estimate the grade of a hill. A 9%er is 50% steeper than 6%er, and a 6%er is pretty steep. The chart that was printed in TDR issue 27 shows the huge amount of rear wheel power needed for each 1% increase in a grade.

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1996 3500 Clubcab SLT, auto, 4. 10 limited-slip, TST #5, 370s, AFC spring kit, Psychotty, Dunrite converter, Trans-Go, DiPricol EGT, boost & trans temp. gauges, 9 ft. aluminum flatbed and tool boxes with Venco dump. Custom front bumper, Hadley air horn, PowerVision mirrors & 4" Stack Exhaust.

 

[jponder]

what does % grade mean? What would straight up be? what would a 45 deg slope be?

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2001 ETH/DEE ST 4X4 SPACE SHUTTLE

 

[John]

jponder, a 45 degree incline would be a 100% grade. Each grade percentage equals 2. 2222222 degrees.

 

[jponder]

Originally posted by John:
jponder, a 45 degree incline would be a 100% grade. Each grade percentage equals 2. 2222222 degrees.

John i dont understand. If a percent equals 2. 22 then 10% would be 22 deg and a 45 deg angle would be 20%. Wonder what the steepest grade in the USA for paved road is?



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2001 ETH/DEE ST 4X4 SPACE SHUTTLE

 

[NVR FNSH]

% grade is the number of feet in elevation rise per 100ft horizontal distance.

Examples:
10 ft rise in 100 ft = 10% or 5. 7 degrees
20 ft rise in 100 ft = 20% or 11. 3 degrees
50 ft rise in 100 ft = 50% or 26. 56 degrees
100 ft rise in 100 ft = 100% or 45 degrees

Brian

 

[jmeehan]

I've always wondered about that.

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ex Ford tech, now driving '01. 5 2500 4X4 QC LB ETH/DEE SLT 3. 54, Patriot Blue

 

[WOWZY]

Is it just an edjucated guess or is there a way to measure it? Are there signs that tell you this before you start up the grade?

 

[klenger]

The signs are usually at the top before you descend. Going up doesn't matter from a safety point of view.

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Ken Lenger
On Order - 2001. 5 2500 QC 4X4 SWB SLT, ETC/DDX 5 Speed, 3. 55 (no antispin), camper group, trailer folding mirrors, RBR CD/Radio, LT265/75R16E AT OWL tires, trailer tow group, Patroit Blue / Agate,
Replaces 98 Jeep Grand Cherokee V8 which is for sale.
Trailite 21' Travel Trailer, ~4000 lbs loaded.

 

[Koa Man]

Originally posted by jponder:
John i dont understand. If a percent equals 2. 22 then 10% would be 22 deg and a 45 deg angle would be 20%. Wonder what the steepest grade in the USA for paved road is?

Don't know about the rest of the U. S. but we have a street here that is a 23% grade for a distance of about a 100 ft. This was in an article on street trivia in our local paper a couple of years ago. i remembered that because I used to drive up that street occaisionally. You could not see over your hood for that short distance.

 

[John]

OOPS! Sorry about the bogus info. guys... I assumed some things I shouldn't have. #ad
I knew 45 degrees was equavalent to a 100% grade. . after that.....

Thank you Brian for providing the correct information. #ad


..... oh well, live an learn right?

[This message has been edited by John (edited 03-02-2001). ]

 

[Ranger Dick]

The proper way to measure a grade is with an instrument called a Clinometer. They are calibrated in percent or degrees or both. What it basically is, is a weighted wheel that has a scale printed on it and a viewing window on a surrounding case A person then sites down the grade and then reads the slope on the window. THe weight keeps the wheel level, and the case is moved to the corresponding slope, The ones I use are from a company called Bruunton.

 

[Jumbo Jet]

So for a descent of 10 miles on a 5. 7% grade, you would vertically descend 1 mile, or 5,280 feet.

Thanks!

[This message has been edited by Jumbo Jet (edited 03-05-2001). ]

 

[Koa Man]

Jumbo Jet,
If you descended 1 mile in 10 miles, it would be a 10% grade.

 

[Thomas]

May as well jump in here.

The grade would be 10% if we were talking about 1 vertical mile and 10 horizontal miles. The grade would be slightly greater than 10% if the vertical distance was 1 mile and the distance traveled over the road was 10 miles.
Having taught algebra for many years, a lot of my ex-students will remember the "grade" that we're talking about here as the "slope" we studied in class. To the mathematician, slope is thought of as "rise over run", or vertical change divided by horizontal change. A straight road that rises 50 feet while covering a horizontal distance of 200 feet has a slope of 50 divided by 200 or . 25. This slope of . 25 can be converted to a percent (per hundred).

. 25 is the same as 25%

Therefore, a road that rises 25 feet while covering 200 horizontal feet is a 25% grade—something not often encountered. Notice that 25% can be thought of as 25 "per hundred", the road rising 25 feet in 100 feet or 50 feet in 200 feet. The . 25 in this example happens to be the tangent of the angle of the road compared to horizontal, in this case a bit over 14°.

A road with a 7% grade (about the maximum on the interstates) rises at about 4° compared to horizontal—much less than what it seems while driving.

As to the question of grade on a vertical road, the mathematician again has an answer. This is a situation where an infinite vertical change is divided by a horizontal change of zero. Division by zero is undefined. Vertical roads have no slope.

 

[Koa Man]

Thomas,
That is way too deep and over my head for me. All I know is when the sign says 6% grade, it will be a steep and hard climb for my med. duty trucks, but a walk in the park for my Dodge.

 

[Koa Man]

A clinometer is also very useful to determine the height of an object. I use it in my work to measure the height of trees. I have a Suunto purchased from Forestry Suppliers.

 

[Bigsaint]

Koa Man, if you ever take that rig to the states, specifically the N. East, c'mon over to Vernon Twp. We have two short, about 1 mile inclines, one is 17% and the other is 25%, great short range testing areas for the Cummins. I know, I know, there's steeper grades and surley longer grades, but their big to me #ad
.

Scott W.

White 2001. 5 3500 ETH/DEE 4X4 Quad cab SLT,tow package and camper prep,Husky liners front and rear,DiPricol pyro,boost and oil temp gauges,Edge EZ,Psychotty air,Bully Dog stage III injectors,ATS 3 piece manifold,HX40 turbo,4" BD exhaust,4" BD E-brake,McLeod clutch,Mallory 4150 lift pump,Mag-Hytec rear,Mopar tonneau,Lund bug shield,PM tractor utility back up lights,Penda bed mat and blow by bottle is bye bye !!! I love the smell of diesel in the morning, it reminds me of... . VICTORY !!!
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[This message has been edited by Bigsaint (edited 03-06-2001). ]

 

[Jumbo Jet]

Thanks all. I was confusing my % and degrees in my post. 10% = 5. 7 degrees.