I finally got around to practicing some uphill landings. I have some experience on mild uphill stuff like Soldier Bar, but wanted to practice some steeper stuff (Mile High prep).

My question is how do you convert % to : to degrees?

Like a 1:1 slope is 45 degrees right? So is that a 50% slope?

According to Google Earth my practice spot in the area I was landing rose 12 feet in 100 feet. Anyone got an easy way to figure this out?

Thanks

UtahMaule wrote:My question is how do you convert % to : to degrees?

Like a 1:1 slope is 45 degrees right? So is that a 50% slope?

According to Google Earth my practice spot in the area I was landing rose 12 feet in 100 feet. Anyone got an easy way to figure this out?

Thanks

To convert % slope to degrees, the formula would be:

degrees = atan(% / 100) you had to ask

a 1:1 slope is 45 deg, a 50% slope is 50 rise for each 100 run, or 26.6 deg

your practice area slope is 12%, so:

degrees = atan ( 12/100) = atan(.12) = 6.8 deg

atan computation is available on some calculators, and in old math books as a table of values. Oh yeah, Excel has it too, and you could generate a table of % slope to degrees. With Excel the results are in radians instead of degrees, so you need to multiply the result by 57.28 Oh hell, here's a quick table I generated from Excel. Holler if you want better than 5 degree spacing.


% Degrees
0 0.0
5 2.9
10 5.7
15 8.5
20 11.3
25 14.0
30 16.7
35 19.3
40 21.8
45 24.2
50 26.6


tom

A good question I also always wondered about.

I like UtahMaules thinking. (that means no math). If a telephone pole is straight up, wouldn't that be 100% slope? If that is so, then his 1 to 1 hill would be 50% in my head. (once again, no math). Going on to a 1 to 2 to a 25%???

Savannah-Tom wrote:

UtahMaule wrote:My question is how do you convert % to : to degrees?

Like a 1:1 slope is 45 degrees right? So is that a 50% slope?

According to Google Earth my practice spot in the area I was landing rose 12 feet in 100 feet. Anyone got an easy way to figure this out?

Thanks

To convert % slope to degrees, the formula would be:

degrees = atan(% / 100) you had to ask

a 1:1 slope is 45 deg, a 50% slope is 50 rise for each 100 run, or 26.6 deg

your practice area slope is 12%, so:

degrees = atan ( 12/100) = atan(.12) = 6.8 deg

atan computation is available on some calculators, and in old math books as a table of values. Oh yeah, Excel has it too, and you could generate a table of % slope to degrees. With Excel the results are in radians instead of degrees, so you need to multiply the result by 57.28 Oh hell, here's a quick table I generated from Excel. Holler if you want better than 5 degree spacing.


% Degrees
0 0.0
5 2.9
10 5.7
15 8.5
20 11.3
25 14.0
30 16.7
35 19.3
40 21.8
45 24.2
50 26.6


tom

I asked if there was an easy way to figure it out.

So if my practice area rose 12 in 100 and that = 12%. Does that always work with 100 feet? Like Mile High is reported to be 22%, is that a 22 feet rise in 100 feet?


Here's the video......

[vimeo]3415893[/vimeo]

I keep an angle finder in my Highlander that reads in degrees that I check the angle of the places I land for comparison and reference. Landing on steep hills is a blast to me. So far the steepest I have landed on is 21 degrees. Steepest I've taken off from is 35 degrees with my engine shut off. It sure makes it sound super steep in %. About 40% and 70%. Wow I must be some kinda nut and didn't even know it. LOL :lol
Hills are like most other things, start easy and and don't get in over your head. Gradually land on steeper ones as you keep getting better at it. When it really gets interesting is when you have real steep and short together. You really have to nail everything then.

Love the Pres. of the United States (Music, that is ).

Great video work. Chasing down the coyote was cool, too!!

Rob, a real nice video you made there. How about some more??

Thanks

The videos are fun to make, I just have the two so far. I've about maxed out my computers memory storing and editing them though There will be more to come

patrol guy wrote:A good question I also always wondered about.

I like UtahMaules thinking. (that means no math). If a telephone pole is straight up, wouldn't that be 100% slope? If that is so, then his 1 to 1 hill would be 50% in my head. (once again, no math). Going on to a 1 to 2 to a 25%???

Funny! For those who are interested:

Slope is rise divided by run. Straight up telephone pole might be 30 ft rise with no run. You get 30 divided by zero, or INFINITE slope.

100% slope means that rise divided by run is equal to one. If that's the case, then rise must equal run, so it's 45 degrees.

1 to 2 means 1 divided by 2 (50%, 26.6 degrees).

hello

Nice video

What software are you using

I have been looking at a new 17 inch Macbook Pro and the more I look at it the more I like it. Imovie looks sweet.

...hey, that is all Greg's fine work. I don't know, but pm me, and I'll foreword you his email. I just tag along for the fun.

If we're talking about grades, which is what is published for runways and roads, the % given is the percent of 90 degrees. Perfectly flat with no slope is 0%, vertical is 100%. So your strip with 12 feet or rise for every 100 feet of run = 6.8 degrees. 100*(6.8/90) = 7.6% grade.

Phil

Bear_Builder wrote:If we're talking about grades, which is what is published for runways and roads, the % given is the percent of 90 degrees. Perfectly flat with no slope is 0%, vertical is 100%. So your strip with 12 feet or rise for every 100 feet of run = 6.8 degrees. 100*(6.8/90) = 7.6% grade.

Phil

I can not speak for how runways are designated (with my limited experience) but I have built some roads and put some pipe in the ground. I would assume they are all the same.
1ft rise over 100ft
1ft divided by 100ft = .01
Move decibel twice to the right = 1%


100ft rise over 100ft
100ft divided by 100ft = 1
Move the decibel twice to the right = 100% the same as 45 degrees

I am sure there are some here that could explain it better than I have.

Small Tail Caddy is correct on the grade. That is how it works. In my former life on the prairie, one of the things I was involved in, was half ownership in a drainage business, we put in millions of feet of drainage tile and it all had to be put in on a precise grade. 12 feet in a hundred, is 12% grade, be it runway or a pipeline. Steve

% grade is defined as (rise/run)x100. So if you go out 100' (horizontal distance) and up 100' (vertical distance) then the % slope is 100%. Out 100' and up 12' feet is 12% slope--((12/100)x100 ), pretty damn steep for a road.

45romeo

45romeo wrote:% grade is defined as (rise/run)x100. So if you go out 100' (horizontal distance) and up 100' (vertical distance) then the % slope is 100%. Out 100' and up 12' feet is 12% slope--((12/100)x100 ), pretty damn steep for a road.

45romeo

Yea, pretty steep for a state highway....

So if Mile High is reported at 18-22%, the math is real simple, it rises 18-22 feet per 100. Right?

Now I know how steep of a practice strip I need to go find. Should be fun.

Whee I tried to send you a PM but don't know if it worked. I think you were looking for a ride to Big Bar this Sat and I might be able to take you. I fly a Highlander out of Nampa. Please let me know if you want to go.
Steve