Nasty Storm, Bouncing Burro - Page 2 - Fiberglass RV


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Old 12-09-2009, 03:46 PM   #15
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Name: Ken
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Ken, it WAS the same one. Thats where I am.
Yikes, I didnt know, I havent been folloing the forum as much. But i grew up in the southern California desert and know how scarry it can be. Have seen big rigs and Rv's blown over on the 10 freeway. We had a truck and camper back then and i thought for sure it was going to blow over a number of times, caught out driving on the freeway. reading your cat yawned made me chuckle
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Old 12-09-2009, 06:25 PM   #16
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Trailer: Bigfoot Rear Queen 25 ft
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There is nothing like being in the trailer in the rain.
Gina, ain't that the truth! That is my favorite sound to wake up to believe it or not!!...
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Old 12-09-2009, 11:42 PM   #17
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This was posted on a Casita forum. The numbers should apply pretty close. Sounds like you were pretty much into the "Peach Pit" level of wind.

Here is one engineers, quick and dirty, Free assesment, of your Question. There are so many variables, I used my professional judgement to make several engineering assumptions. They are on the conservative side.
- 100 square foot, side cross section area (7x14)
- 100 MPH wind or wind gust
- Air density 0.08 lbm per ft cubed
- center of lateral force 54 inches above the ground
- 1250 lbm per wheel down force at 66" between centers
- camper doesn't slide sideways but pivots on leward wheel

Calcs:
wind force - 100MPH / 3600sec/hr X 5280ft/mile X 0.08 lbm/ft cubed X 100sq ft = 1200 lbs force/sec
Force resultant - (66in X 1250lbm CW ) - (1200lbf X 54in CCW) / 66in = 250 lbs of down force on the windward wheel
Margin of safety - 250lbm final / 1250 lbm initial X 100 = 20 percent.

Conclusions:
-A 20 percent margin of safety is not very good. Especially with quick and dirty conservative calcs.
-If they are predicting 100mph, and above, gusts I would take corrective action.
-100MPH wind gusts seem to be the break over point. As the wind gusts approach 100 you need to be approaching corrective action. If the wind gusts are over 100 you should have allready taken corrective action.

end notes:
- Parking your trailer so the ends (not the sides), take the brunt of the force, would help.
- Parking a car, or truck, beside (windward side) the camper would help block/absorb some of the sideforce wind.
- Anything up to 50 MPH gusts, I'd not do much. (750lbs downforce on windward tire). At 75MPH gusts, I'd be nervious as a possum passing a peach pit. (525 lbs down force on windward tire).

Disclamer: Your milage may very, you are getting what you are paying for.
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