Archive for October, 2009

Cheyenne Mountain State Park, Colorado Springs CO

Monday, October 5th, 2009

dsc_2660.jpg

We have been waiting for two years for the campground at Cheyenne Mountain State Park to open.  Every year we come by Colorado Springs to visit with members of Eleanor’s family, and we have tried different places to stay each time.  They’ve all been fine, but nothing has been super-convenient to their home, and some places we’ve tried have been so far out of Colorado Springs that I can’t make phone calls or get online, which makes work impossible.

Finally this year we got our first chance to try the newest state park in Colorado, right at the granite base of Cheyenne Mountain, and it has been sweet. This place is first-class all the way.  The park road winds up 600 feet of elevation (from 6,000 to 6,600) and includes a spectacularly nice Visitor Center (complete with cushy Mission-style furniture and a fireplace), many hiking trails, bathrooms, showers, laundry, camp store, four RV/tent camping areas, and special walk-in “tent only” campsites.

dsc_2662.jpg

The views are excellent from up here, looking east to the valley of Colorado Springs and backdropped to the west by the imposing sight of Cheyenne Mountain.  It’s fall, so some of the low vegetation is changing color, which makes the view even more entrancing.

But best of all are the superb campsites.  They are varied in shape and size and distributed around curving roads and cul-de-sacs, so the campground doesn’t have the boring homogenous “parking lot” look.  The sites feature the same perfectly level pink concrete that we appreciate so much when we are at Cherry Creek, along with large gravel picnic areas, fire rings with steel covers (first time I’ve seen those in a state park!), two rustic-looking water outlets (one positioned for RVs, the other for tents), a separate gravel tent pad with tie-down rings (because it’s windy here and tent stakes won’t hold in the gravel), and full hookups with 20/30/50-amp power.

The sites are well separated and bordered with plenty of natural local vegetation of the arid high-altitude variety. At $22 per night for full hookup (plus day use fee of $6 or annual state park pass), it’s a pretty good deal.  I can’t find anything not to like.  I suppose in the winter I might not like it as much, but the campground starts to go through a series of stepped closures starting October 15 anyway.

For business purposes, my Verizon Internet card works well enough up here, but I notice that phone calls often drop despite a strong cellular signal.  This may be caused by the multitude of large antennas atop Cheyenne Mountain — a short straight-line distance away.  The military is still active inside the mountain, and who knows what sort of RF they’re beaming out.  Other than this nuisance, the park combines business and pleasure for me very well.

We’ve spent three days in the park and will be leaving tomorrow.  We certainly could stay another day or two to enjoy the company and the blustery fall weather, but we want to get across the Rockies in the next couple of days, before some early winter weather shows up.  We’ve been getting days in the 50s and 60s recently, but by Saturday the forecast calls for snow and a high of just 39.  Time to move on — but we’ll be back to Cheyenne Mountain State Park again.

Oscillation

Sunday, October 4th, 2009

I just read Forrest McClure’s recent blog post on the Airstream Life Community Page about his driving experience on I-25 near Denver.  Forrest and Patrice spent a couple of pleasant days with us in Cherry Creek State Park, which is one of our favorite western stops.

I had not thought to mention the undulating stretch of pavement on I-25 in my first blog from Cherry Creek, but when Forrest and I got talking he brought it up and I was interested to hear how similar our experiences were.  I want to talk about it further because it brings up an important safety issue for trailerites, and it gives me the opportunity to debunk some “urban legends” about towing.

As Forrest describes in his blog, the effect of undulating pavement (whether bumps, potholes, or even railroad crossings) is to make the trailer oscillate up and down at the tongue.  The faster you go, the worse the effect, so if you read no further than this, take away one simple message: SLOW DOWN when the road gets funky.

When the trailer tongue lifts up, it unloads the weight on the rear axle of the tow vehicle. This removes part or all of the ability of the tow vehicle to control the trailer.

Let me repeat that, because it’s important to appreciate: an unloaded rear axle means you are no longer in control of the trailer.  It does not matter how heavy your truck is.  It does not matter what hitch you are using.  It does not matter that you are the world’s best driver. You are now a passenger.  The trailer, even a lightweight one, can easily shove your and your truck off the road in that brief “unloaded” moment, because when only the front wheels are in firm contact with the ground, you cannot expect to command the trailer.

The degree of this loss of control depends on a lot of factors.  Speed has a lot to do with it, because the harder you bounce the trailer, the more it is going to lift your rear end.   Independently-suspended vehicles have a slight advantage over solid axles, because they can keep their wheels planted more firmly in adverse handling conditions.

Heavier vehicles are harder to lift, but don’t think that’s going to save you. A typical Airstream with 800 lbs of tongue weight can easily bounce upward (on a good bump) with a force two or three times the tongue weight.  In other words, imagine lifting up on the rear bumper of your truck with 2400 lbs of force.  It may not come off the ground, but it sure it going to lose firm contact with the ground, with commensurate loss of control.   You might as well be driving on ice.  This is why I do not agree with the common belief that “heavier is better.”  It’s only partly true, and induces overconfidence.  There’s much more to safe trailering than just using a big truck.

I remember hearing an anecdote from an Airstream dealer about this phenomenon.  He was towing a 1960s-era Airstream which was unduly light in the front (due to some parts being removed), using a heavy-duty pickup truck. Going around a curve, the trailer simply pushed his truck right off the road.  Why? Because having inadequate tongue weight makes it easier for the trailer to lift the rear end of the truck.  The trailer weighed about 3000 lbs, half of the weight of the truck, and yet in his words, “It pushed that truck around like it was a toy.” An oscillating trailer will cause exactly the same result.

Fortunately, both Forrest and I were traveling in a straight line, and both of us had the presence of mind to slow down. From our discussion, it sounded like Forrest got the worst of it, because he had some horizontal sway (side to side) and we did not.  He also may have encountered the bumps at a higher speed, since I saw them coming and he didn’t.  But as he pointed out, you can’t expect your equipment to save you in this situation.  “Sway control” that is typically available on hitches is effective only on horizontal sway, not oscillation (up and down).  You’ve got to slow down.

On the other hand, there is something to be said for a really good vehicle suspension.  When oscillation occurs, you want it to stop as quickly as possible.  The damping effect of the tow vehicle’s suspension is crucial here. The trailer will keep bouncing you for a while after encountering the bump, and that means the rear axle will get loaded and unloaded repeatedly.  Each rear-axle unloading event is an opportunity for the trailer to push you, and each front-axle unloading event will give you a uncomfortable moment of understeer.  The sooner it stops, the happier you’ll be.

Again, here’s where heavy truck drivers can become overconfident.  Many trucks have very stiff suspensions, which resist compression even in an event such as we’ve described.  Since the driver doesn’t feel the truck bouncing, he/she may assume that the truck is unaffected.  Thus, the common statement that, “The truck doesn’t even know the trailer is back there.”

Actually, it’s the driver who doesn’t know what’s going on.  A stiff truck suspension will resist bouncing, definitely, but the weight-loading effect caused by the trailer hitting a bump is still going to occur.  Even if the truck doesn’t dip and bob, the weight distribution to the axles is still changing dynamically as long as the trailer is oscillating.  You just can’t see it, or feel it, in the seat of your pants.

So in this case, what happens?  Most of the time, nothing happens, the driver is clueless, and the truck and trailer go on their merry way.  Once in a while, the grip of the rear axle is too light to continue controlling the trailer, and “suddenly without warning we went off the road!”

Personally, I’d rather be well-warned in advance that the rear axle is being unloaded and that I’m pressing the limits of tire adhesion, rather than be completely unaware and surprised when the limits are exceeded.  If you tow with a vehicle that has a numb rear suspension, keep in mind that it’s not telling you something. Did I mention to “slow down”?

Of course, traveling on an uneven surface, wet or snowy surface, on a curve, or with improper weight distribution, will all exacerbate the problem.  If you want to be safe (and who doesn’t?), start with a properly set-up hitch and weight distribution, then respect the conditions you’re in.

Despite driving radically different vehicles, both Forrest and I felt the effect of undulating concrete very dramatically.  It’s impossible to say scientifically which tow rig performed better, but in any case our mutual experience underscores the need to respect the road.  There’s no substitute for driver caution.

About the Author

Editor & Publisher of Airstream Life magazine