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Old 07-24-2009, 04:10 PM   #1
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Sweet spot for Speed

Got up close and personal with my new SunCruiser a bit more this week on a 1000+ mile trip to the Smokies near Asheville, NC. I noticed something interesting: at almost exactly 60 MPH (and below), the rig gets very quiet, the noise level drops considerably, and the coach is very much more stable on the road. It's less busy, tracks better and is a pleasure to ride.

At 65 MPH, it is fine, but you have to talk a little louder, and the bus is much busier in the lane. At 70, it requires attention to keep your lane position when being passed, and the noise is an irritation.

I assume this is largely due to air resistance and turbulence and its relationship to the square of velocitiy, or something like that. So enjoyable was the 60 mph ride that I settled in there even when the speed limit was 70. So what if we get there 15 minutes sooner - not to mention the improved mileage.

Is this effect typical of most rigs? That specific at a given speed?
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Old 07-24-2009, 04:35 PM   #2
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personality

I think most rigs have a personality ... how you have it loaded (fuel, fresh water, people, stuff), how the tires are inflated, what direction the wind is from, etc causes them to handle and have different sounds ...

I am glad that you found a "happy spot"
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Old 07-24-2009, 04:38 PM   #3
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65-67 is our magic spot.
now in Mississippi or Louisiana all bets are off, those roads are flat horrible
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Old 07-24-2009, 06:17 PM   #4
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Rich, your rig is like life - things work pretty well at 60, not so well at 65 and begin to go to hell when you get to 70 and above...
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Old 07-24-2009, 06:25 PM   #5
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Quote:
Originally Posted by REWahoo View Post
Rich, your rig is like life - things work pretty well at 60, not so well at 65 and begin to go to hell when you get to 70 and above...


And I'm getting a lot more gas .
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Old 07-24-2009, 08:20 PM   #6
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I am slowing down to 55 this year to see if the MPG increases. So far changing from 65 to 55 is showing significant gains. I have more time to react at 55 and get there very nearly as fast.
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Old 07-24-2009, 10:56 PM   #7
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62 mph is our sweet spot. the tach reads a little over 1400 rpm and I can get 9 - 10 mph unless it is windy. both traffic and wind will cause me to slow down. I must drive at least 58 mph to get it into 6th gear.
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Old 07-25-2009, 08:09 AM   #8
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Our "Sweet Spot" with our Suncruiser is 2000 rpm in 6th gear.
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Old 07-25-2009, 08:10 AM   #9
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The sweet spot on our MH is 63mph @2200rpm's. At that speed we seem to be floating along without much effort and are usually getting 8-8.5 mpg.
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Old 07-25-2009, 11:49 AM   #10
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Thumbs up Speed

I keep our MH between 55 and 60 mph.... great speed, super view and get to the destination very relaxed.
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