Question on 422 power

BobRip · Sep 19, 2006

It would never make it up a 25 to 30 degree slope. (someone may correct me on this). Maybe when cold with the mower off you can wiggle up a 25 degree. Other than that no way. I can barely wiggle up the 25 degree on my yard when cold. That is a lot of slope for all but a few wheeled machines. If the ground is wet it is even worse.
Ten degrees is no problem.
I do plan to buy a 425 in about 4 years, (God willing and the stock market rises.) just to get the extra wheel motor torque.

BillCroasmun · Sep 25, 2006

Bob, I'd have to say your under estimating the PT or over estimating the slope.

I have a 10.5' drop from my back yard to the lower creek area behind my house. I am about to cut an additional path down it so I have just recently measured it. It's a 38 horizontal run. I believe slope degrees is calculated as rise divided by run which makes my current path 27.6 degrees.

It takes me two swipes to mow it with my small 180 mower deck and I mow it up on one swipe and down on the other. Unless it's real wet I never have any problems. The sump pump and down spouting drain run to the top corner of this path so it sometimes is wetter than the rest of the yard when mowing.

BillCroasmun · Sep 25, 2006

Sorry Bob I type faster than I think at times!

I was thinking of the percentage of a grade... I started thinking, a 10' rise and 10' run in my formula would be 100 percent but in degrees that's only 45.

I'd have to look up the formula for degrees... my last math class was quite a few years ago.

Bill

MossRoad · Sep 25, 2006

A 10' rise in a 40' run is the same as a 1' rise in a 4' run. That is a 25% grade which equals 1/4 of 90 degrees. So, should be 22.5 degrees.

(I think

)

Nope!

1 foot rise in 1 foot run = 100% grade = 45 degree slope.
1 foot rise in 2 foot run = 50% grade = 22.5 degree slope.
1 foot rise in 4 foot slope = 25% grade = 11.25 degree slope.

Is that right?

BobRip · Sep 25, 2006

MossRoad said:
A 10' rise in a 40' run is the same as a 1' rise in a 4' run. That is a 25% grade which equals 1/4 of 90 degrees. So, should be 22.5 degrees.

(I think )

Nope!

1 foot rise in 1 foot run = 100% grade = 45 degree slope.
1 foot rise in 2 foot run = 50% grade = 22.5 degree slope.
1 foot rise in 4 foot slope = 25% grade = 11.25 degree slope.

Is that right?

I believe so. I have a digital level which I use for this measurement. and 50% grade is a bout 22.5 degrees. These are often confused.

Homebrew · Sep 26, 2006

Hi all,
The exact formula for calculating the degree is the inverse tangent of rise/run.

1 foot rise in 1 foot run = 100% grade = 45 degree slope.
1 foot rise in 2 foot run = 50% grade ~ 26.6 degree slope.
1 foot rise in 4 foot slope = 25% grade ~ 14.0 degree slope.

A 10.5 foot rise in a 38 foot run = 15.4 degree slope.

Hope this is helpful,
Jeff