Thread: That angle thing....

Originally Posted by Blknight.aus

but Given that I know for a fact that you can climb a 45 degree slope without any problems in a rover ..........................

Maybe on a good surface, but 45 deg - 100% is about the maximum gradability for a landie.

A 45 degree slope means the front wheels are 2.79m higher than the back.

% grades are just a ratio of height divided by horizontal run expressed as a percentage. ie if you go up 1m for a horizontal distace of 3m then thats 1 in 3 or 33%.

reread the above post, to work out the angle from the % you need to express the % as a fraction and look up the inverse Tan

ie 100% = 1.00 inv Tan = 45 deg.


Martyn

I'll buy that but cmon 30ish degrees as max forwards slope and 20ish for side? Ive been on kurbs nastier than that...

Originally Posted by Blknight.aus

I'll buy that but cmon 30ish degrees as max forwards slope and 20ish for side? Ive been on kurbs nastier than that...

Yes, but you're not quoting the factory specs, which are expressed in degrees. My recollection was 45 degree front/back and 40 degree side slopes.

Steve

45 degrees as an incline!
It is accepted physics that above 45 degrees the down force of gravity for traction turns negative.

Hill climbing contest are often held on slopes of around 45 degrees or above, as momentum acheived on the lesser angled approach is gradually lost on the incline, if the vehicle turns sideways it will roll and stopping above 45 degrees is, depending on terrain potholes etc, not really possible.

So decents are possible on 45 degrees or slightly above but a clear way to the bottom is neccessary as stopping is not really an option hence the development of 'handbrake assisted decents'

45 degrees is Xtreme.

Hence why our "Show track" we built for the Whyalla show has 50+ degree inclines....

Just to make it, erm... Entertaining for the punters!

A bit of a run up and whoop, your over... Descents, now they're fun!!!!

We love pushing the envelope!

Originally Posted by scrambler

Yes, but you're not quoting the factory specs, which are expressed in degrees. My recollection was 45 degree front/back and 40 degree side slopes.

Steve

Ummm if thats the case then my series can climb 60 degrees and side slope 40?

I know I havent been that far, I can prove Ive done the 50 degree knife edge at pucka in one and side sloped to 30 degrees in a 110.. but that was at the limit of my pucker factor and Im certain the vehicles had more to give If id been keen enough to ask.

Originally Posted by Blknight.aus

Ummm if thats the case then my series can climb 60 degrees and side slope 40?

I know I havent been that far, I can prove Ive done the 50 degree knife edge at pucka in one and side sloped to 30 degrees in a 110.. but that was at the limit of my pucker factor and Im certain the vehicles had more to give If id been keen enough to ask.

Don't know what a Series is quoted at, but this is the Australian Defender spec, via the Estonian LR club.

http://www.landrover.ee/est/files/ma...nder_specs.pdf

"Only" 30 degrees on the traverse "dependent on load." So seems like your pucker factor is about what the engineer's was too.

Steve

Originally Posted by Blknight.aus

It appears I may have goofed in another thread about what percentage eqeals what angle but Im not sure I agree with what was said...

Without going back to find that other thread, but relying on memory.

I think you said 90 deg was 100%, now you may have been mixing up % with grads. I don't usually see grads used, but 90 deg = 100 grads.

Which reminds me, militaries measure angles in mils. The mil was derived by the Germans from 1 in 1000, which made it easy to do angle calculations without needing sin, cos or tan tables.

Military binoculars etc. have graticules in mils, which allow range to be calculated in your head if you know how large the object is that your are looking at.

An outstretched arm can be use as a good estimate of angle in mils

...hijack off.