Thread: How to calculate Gradeability?

Originally Posted by uninformed

so you would run a panhard in the rear also...Im sure with your skills mech. steering will be fine..Im starting to picture in my head what you are doing...with regards to packaging would you be able to have engine/gearbox/tcase mounted in the normalish places and still have room for the tcase-forced articulation box to be in the dead center of wheelbase so as to keep the simetry in the front rear links

yes I would say that roll center would be center of panhard if running one...you can easiily make the front and rear RC heights whatever you like to give you desired results..

what body config are you considering...(just trying to get an idea of cog over front and rear axle)

just a shame you dont have to front steer axles

Yes Serg packaging everything to fit the forced artic diff between the front and rear wishbones without raising the engine/transmission too much may get complicated. I'm trying to work out if symmetry is actually necessary. my current rear wishbone is offset a few inches to the left to clear the handbrake drum. And most Unimog front differential/torque tubes are offset to the left as well.
Body would be normal control Landy hardtop or ute style. Engine would be Toy 3b deisel with the agricultural but trouble free Warner T98 4 spd, series 2a transfercase and crawler box out of my 2a if the project looks viable enough for me to dismantle the old girl. That would be the most difficult part but the chassis is suffering from serious fatigue from winching too many big trees out on my property and the body has been beaten almost into submission from extruding it through narrow water courses.
Wagoo.

Hey Bill, great to see your input on Aulro.
I need to get some sleep right now, but have subscribed to this thread for future reference.
I still have plans for a forced artic setup, but as always, I break my **** to often to even get close to fabbing something up.

Originally Posted by isuzurover

To drive a 45 degree slope you need to have perfect friction. So anyone who claims to have driven up a slope 45 degree or greater that is significantly longer than the wheelbase of their vehicle (i.e. you can't use momentul to carry you over) is full of BS.

except for fomula offroad vehicles....

Originally Posted by uninformed

except for fomula offroad vehicles....

Bugger - should have checked for typos in that post - went back and fixed it.

That is different. Formula offroad vehicles have paddle/scoop tyres, which dig into the ground so the force vectors change.

However, momentum plays a big part! After all they move so fast they can drive on water


However, for the same reason, tanks can also drive slopes up to ~60 degrees - again because the tracks dig in and apply the force in a different direction.


For a standard 4x4 with rubber tyres though, in most cases the lugs are too insubstantial or the ground unuitable for them to act like FOR tyres or tank tracks.

Originally Posted by isuzurover

Bugger - should have checked for typos in that post - went back and fixed it.

That is different. Formula offroad vehicles have paddle/scoop tyres, which dig into the ground so the force vectors change.

However, momentum plays a big part! After all they move so fast they can drive on water


However, for the same reason, tanks can also drive slopes up to ~60 degrees - again because the tracks dig in and apply the force in a different direction.


For a standard 4x4 with rubber tyres though, in most cases the lugs are too insubstantial or the ground unuitable for them to act like FOR tyres or tank tracks.

hehe, I was only stirring Ben....I knew you were referring to stock LR's on stock to normal Offroad tyres..

good info on why they can do so well....I was thinking HP/weight was a factor but tanks anit so light...

LandRovers display/promotional arch at Wandin Park, the home of the Vic 4wd show is over 45 degrees. I cant walk up it without using my hands on the sides of the treadway. The surface is perforated steel, with more grip than most surfaces found in the off road environment, although that high traction slabrock they have in the popular rock crawling areas of the US might come close, i don't know.
Wagoo.

Sticky rubber tyres can reach friction values of 1.1 so 45 degrees is possible given the right combination of ground,tyre and weight placement.

I haven't done the maths on this yet.

Originally Posted by wagoo

LandRovers display/promotional arch at Wandin Park, the home of the Vic 4wd show is over 45 degrees. I cant walk up it without using my hands on the sides of the treadway. The surface is perforated steel, with more grip than most surfaces found in the off road environment, although that high traction slabrock they have in the popular rock crawling areas of the US might come close, i don't know.
Wagoo.

I was going to mention this also...they have used ths type of display for many years...but I figured that the surface amounted to cheating