Need help design and build jump and skill features

chaloots

Member
OK maybe I will add bits in here. I saw a sign the other day for screened topsoil. It was $20 a cubic yard which can add up. But after having dug in my yard for the better part of a year, it saves my back countless hours of pain. We live 4 miles from CR so that gives you an idea of the dirt-to-rock ratio.

Had this dropped today. Behind it you can see what my whale tail has turned into - a sort of tabletop-ish like thing. The wood to the left behind it is the second line, which goes to the left of the main line. Behind the tree slightly to the right of the dirt pile peak is the landing of a gap jump on the alternate line. You can also see a wooden ramp back there which is on the shelf for now as we only use it for scoping.

This pile will go into building up the 2nd & 3rd table-tops and the exit to the berm. More than likely that will tap all of this out.

The whale tail landing will also get widened. It's pretty goddamn sturdy so I am going to bring it out 6" each side to make the landing a little more error proof.

I am also thinking that there will be a 3rd line to this side of the whale tail before the end of 2021. My guess is that we will have 3-4 of these loads dropped by then.

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I have been lucky to get dirt for no cost. All it took was A LOT of persistence and FB marketplace.
 

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Norm

Mayor McCheese
Team MTBNJ Halter's
I have been lucky to get dirt for no cost. All it took was A LOT of persistence and FB marketplace.

I have gone the free dirt route and it ended up being shady guys that dump all sorts of garbage in your yard. Mostly glass but the free stuff has all kinds of rubbish in there.

That said, your pile looks great.
 

iman29

Well-Known Member
OK maybe I will add bits in here. I saw a sign the other day for screened topsoil. It was $20 a cubic yard which can add up. But after having dug in my yard for the better part of a year, it saves my back countless hours of pain. We live 4 miles from CR so that gives you an idea of the dirt-to-rock ratio.

Had this dropped today. Behind it you can see what my whale tail has turned into - a sort of tabletop-ish like thing. The wood to the left behind it is the second line, which goes to the left of the main line. Behind the tree slightly to the right of the dirt pile peak is the landing of a gap jump on the alternate line. You can also see a wooden ramp back there which is on the shelf for now as we only use it for scoping.

This pile will go into building up the 2nd & 3rd table-tops and the exit to the berm. More than likely that will tap all of this out.

The whale tail landing will also get widened. It's pretty goddamn sturdy so I am going to bring it out 6" each side to make the landing a little more error proof.

I am also thinking that there will be a 3rd line to this side of the whale tail before the end of 2021. My guess is that we will have 3-4 of these loads dropped by then.

178406337_10224531252524791_8991607710755522463_n.jpg
wow when's the next group ride here?!!
 

Jason

JORBA Board Member/Chapter Leader
JORBA.ORG
I saw a sign the other day for screened topsoil. It was $20 a cubic yard which can add up..

That's a great price for screened fill. I usually pay around $24 and I get a little better price if I bring in a full truck load. Anyone that has gone the "free dirt" route is in for a rude awakening when they start pulling out old bricks and other basketball sized nonsense. It also pays to make sure you are getting the right amount of clay in the material. If you want free dirt, call a pool and septic company. They will very happily unload in your driveway.
 

thanniel

New Member
OK maybe I will add bits in here. I saw a sign the other day for screened topsoil. It was $20 a cubic yard which can add up. But after having dug in my yard for the better part of a year, it saves my back countless hours of pain. We live 4 miles from CR so that gives you an idea of the dirt-to-rock ratio.

Had this dropped today. Behind it you can see what my whale tail has turned into - a sort of tabletop-ish like thing. The wood to the left behind it is the second line, which goes to the left of the main line. Behind the tree slightly to the right of the dirt pile peak is the landing of a gap jump on the alternate line. You can also see a wooden ramp back there which is on the shelf for now as we only use it for scoping.

This pile will go into building up the 2nd & 3rd table-tops and the exit to the berm. More than likely that will tap all of this out.

The whale tail landing will also get widened. It's pretty goddamn sturdy so I am going to bring it out 6" each side to make the landing a little more error proof.

I am also thinking that there will be a 3rd line to this side of the whale tail before the end of 2021. My guess is that we will have 3-4 of these loads dropped by then.

178406337_10224531252524791_8991607710755522463_n.jpg


Enjoy the project. Always fun stuff to add/do isn't it? :) I have the same situation here with tons of rock all around. I guess people call this Chimney Rock for a reason.
 

Norm

Mayor McCheese
Team MTBNJ Halter's
The first thing I am going to work on is the 2nd tabletop, after the wooden one shown above. This is how it looks from the side.

As you can see it slopes a little downhill.
As you can also see, we build the base out of rock and cover with dirt.
This was a v1 done at the end of last year

The drop on the alternate line is behind it. I planted that with a level so you can see just how much this thing slopes down.

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Here is how it looks from the landing. You can see the whale tail ending and the start ramp way off in the distance. Yes, we will be addressing that narrow launch strip at a later time. Right now I am focusing on moving this dirt pile into place.

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In reality, it is a foot low on the landing side which explains why this never felt fluid at all.

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So I added some rocks on the corners to act as anchors. We will fill the middle with more rocks then top it with dirt.

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I added some more rocks but this will take a little effort and today wasn't the day for it. The aim is to get this wrapped up before the end of the weekend. My guess is that at least 1/3 of the dirt pile ends up on top of this. By raising that landing a foot, we're going to need to really build up the backside with another rock base then more dirt.

The top of the table is just about 8' from start to finish right now and it sits maybe 2' tall, though that is a guess.

More to come on this in the next few days.
 

Norm

Mayor McCheese
Team MTBNJ Halter's
@Jason can you even buy clay? Unfortunately every search on the subject gets me to modeling clay or clay pots, etc. Not sure where to find something like that other than cruising the neighborhood hoping to find massive trees that have fallen over.
 

Jason

JORBA Board Member/Chapter Leader
JORBA.ORG
@Jason can you even buy clay? Unfortunately every search on the subject gets me to modeling clay or clay pots, etc. Not sure where to find something like that other than cruising the neighborhood hoping to find massive trees that have fallen over.

Typically I will ask the supplier that is doing the screening if they have a load with higher clay content. If I am taking fill from someone, I will take samples and it's a time consuming process. It's easier to fix a batch with too much clay by adding sand to the mix but the fill needs to be dry and it's a pain to do by hand. I would prefer mixing with a skid steer but you may need a screen to break up the clay for proper mixing.



Some things to consider is a higher clay content and you will have much greater frost heaving issues and extremely low permeability but it will pack hard as a rock.
 

ekuhn

Well-Known Member
@Jason can you even buy clay? Unfortunately every search on the subject gets me to modeling clay or clay pots, etc. Not sure where to find something like that other than cruising the neighborhood hoping to find massive trees that have fallen over.
You can buy clay, by the truck load. The clay content in soil is good and bad. Just as 6mile turns to crap after a rain due to the high clay content. Too little clay, bad. Too much clay, bad. Just the right amount of clay, can still be a headache.
 

Norm

Mayor McCheese
Team MTBNJ Halter's
Start the buildup by putting in the big rocks & anchor rocks as I call them.

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Then I fill in with a mix of smaller rocks & junk dirt to start to fill it in.

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Finally I top it with the good stuff I just had delivered.

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You can see it still slopes slightly down but it’s much better. I’ve now turned that landing into a drop so before I waste anymore topsoil I’m going to build the base to that landing.

Off to the wheelbarrow now.
 

chaloots

Member
Made some progress yesterday. Similar to norm we used large rocks as base and filled in with dirt. We tilled dirt In the bucket, applied as top layer and buttered it up .
 

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Norm

Mayor McCheese
Team MTBNJ Halter's
The buildup of the landing is more or less the same:

1. Big rocks
2. Smaller rocks
3. Dirt & rock mix
4. Some fill dirt
5. The new dirt

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Finally we add some clay to the front & back. We don't have much clay right now so we use it sparingly.

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Norm

Mayor McCheese
Team MTBNJ Halter's
The start. Not quite 5’ high but close.

Before:

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After:

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From the top:

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My advice to people doing this. Make it wider than you think to start. When you ride down the 18” wide ramp once or twice it’s no big deal. If you try to session it you realize there’s no room for error.
 
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