Science behind building a berm

[CogitoErgoSum]

Hoezit to the knowledgable

 

Is there a science behind building berms to assist with cornering at speed? Approaching angle vs angle of exit determining height of berm? How do you secure the berm in place (ie so the soil don't wash away...)

 

I am extending my singletrack on the farm. There is a fairly steep down section (not a clean drop, more like 'afdraande') that drops about 2,5m within 2m or so. 3m from the landing I need to make 90 degree turn right, or it is into the bushes and trees and river...

 

Now, making that turn at some speed (you know, you have to go faster everytime), how should I build the berm?

 

I'd rather gather insight directly from the bottomless resources that is thehub, than watching youtube videos.....

[raptor-22]

Yes there is science to it but you'd need to get an engineer in to work out what's needed based on entry speed that is achievable to the berm, then work out force on the berm and then how to retain it against that force....

 

 

Or you just grab a couple tones of clay and more it into shape and hope for the best

[Paul Ruinaard]

Speak to the guys at Mt Grace Cog n Sprocket - they have built some nice ones there. 

[pista]

Hoezit to the knowledgable

 

Is there a science behind building berms to assist with cornering at speed? Approaching angle vs angle of exit determining height of berm? How do you secure the berm in place (ie so the soil don't wash away...)

 

I am extending my singletrack on the farm. There is a fairly steep down section (not a clean drop, more like 'afdraande') that drops about 2,5m within 2m or so. 3m from the landing I need to make 90 degree turn right, or it is into the bushes and trees and river...

 

Now, making that turn at some speed (you know, you have to go faster everytime), how should I build the berm?

 

I'd rather gather insight directly from the bottomless resources that is thehub, than watching youtube videos.....

 

[DR ◣◢]

http://nsmba.ca/trail-building-tips

[CogitoErgoSum]

Ja, slightly bigger than I thought to do. Guess it will be a case of "just do it". I hoped there was an easier, more straight forward way without sukkeling...

 

Thanks

[NicNacDH]

As you are from Pretoria, you should know the Big Red Barn?

The berms are perfect @ this place, just ask the guys there, who is the builder, and i am sure he will meet you for a beer @ your place and can give you some advice?

[snaphaan]

Look at this.

http://flickrhivemind.net/User/Austin-MTB-BMX-Alliance/Interesting