Archive for July, 2010

my saddle pack contents

I often need to help people on rides or stranded on the trail. This is what I carry:

saddle pack contents

saddle pack contents

(click image to englarge)

    spare tire (used tire, wrapped in kitchen wrap)
    Park multi-tool
    Innovations IH CO2 inflator
    CO2 cartridges (bulk pack from WalMart)
    Hurricane HPV mini pump
    two spare tubes in sandwich bag to protect them
    pair of tire “irons”
    flat kit
    “green” spoke wrench
    two tire “boots” cut from old road tire
wrapped tire

wrapped tire

Wrapping the spare tire tightly in kitchen wrap makes it very compact and manageable. I’ve need to use that spare tire several times myself, but more often I’ve donated it to other riders with cut tires. It’s a savior when you need it.

measuring the grade

Thanks to the Hilti company for loaning me one of their super accurate laser levels for the weekend. I spent a portion of Friday and Sunday afternoon-evening taking measurements on the the tunnel gradient. Good news, the tunnel is definitely going downhill to the west and we will have no drainage toward the east entrance. Total elevation drop east-to-west is 30″.

I must say that it is really nice to have access to some first class equipment to do these measurements. The Hilti level is accurate to 1/16″ in 300ft, self-leveling with a detector that tells you how far you are off zero with audio cueing. There’s no guessing with this data, I took readings every twenty feet over the measured 723ft of the tunnel. Very kind of the local Marietta office of Hilti to help us out. Still need to plug the data into a spread sheet to calculate the height of the curbs we will need to divert the water out the west end; however, reviewing the raw numbers, it looks like the 2″ height for the curb I was thinking of will be adequate for most of the tunnel. There is one “bump” ~60ft in length on the norhside of the tunnel that will require some lowering to make the curbing work efficiently.

Hilti laser detector

(Click image to enlarge) In the enlarged image you can see the red light from the rotating laser beam. The self-level feature made this soooo easy. Just attach the laser to their tripod and press the “on” button. It was ready to go in about a minute! Hilti provided everything except the sliding transit stick which I had to buy from Home Depot… the $50 dollars was well spent as it made the measuring process easy. Just slide it until the detector read “zero” (like the photo) and read the height on the stick.



Also managed to sneak in a photo of a butterfly that was visiting our work site. Sorry that the macro quality on my camera isn’t the best, but a colorful subject.

Brushy Mtn Tunnel, update July ‘10

We’ve achieved some amazing results with our clean-up efforts at the Brushy Mtn Tunnel on the Silver Comet Trail. Dry weather during early July rewarded us with a nearly dry and mud free tunnel to ride through. (Click images to enlarge)

Brushy Mtn west

Brushy Mtn Tunnel west entrance, early July

Inside tunnel, near the east entrance:

Inside tunnel, early July '10

However, with the return of warm humid weather, the cool interior temperatures of the tunnel cause a rapid transition. The high humidity causes the formation of tunnel fog. In early morning you often can’t see the other end of the tunnel. Wisps of fog emanating from the tunnel form “tunnel ghosts”.

Tunnel Fog

Tunnel fog, approaching west entrance to tunnel.

Tunnel fog at west entrance, the east entrance is not visible due to the dense fog.

Tunnel fog, early morning.

Tunnel fog, early morning.

As the exterior temps and humidity rise, the tunnel walls begin to condense water. The condensing water trickles down the walls and pools on the tunnel floor.

Condensate on tunnel wall.

If you click and expand the image to the left, you can see condensing moisture running down the tunnel wall and pools of water forming at the base of the wall.

When high humidity and warm temperatures persist for several days, the interior surfaces of the tunnel will become saturated with moisture. During the late evening, the interior lights of the tunnel and evening sunlight from the west entrance can form a shimmering effect on the moist tunnel walls and floor.

Evening at the tunnel.

Evening at the tunnel.

I don’t like the tunnel being so wet, but it is a pleasant visual treat and dramatically demonstrates how the water accumulates in the tunnel.

Sunset on the Trail

Snapped this photo leaving the Rambo Trailhead the other day.
(Two images, digitally stitched, click to enlarge.)

Sunset Rambo Trailhead