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Old 06-24-2015, 05:28 PM   #21
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I don't want to start a crap storm but this is one reason I am against a roof raise. Some just don't have the structural engineering experience to do the job properly, like me. I don't always admit my shortcomings but when I do, I prefer Dos Equis...and defer to the school bus engineers.
I agree as well. I'm not saying the roof raises on here are shoddy, but a standard bus is engineered good enough to provide safety in certain roll overs. I understand the wrecked busses were heavily modified and obviously unsafe. But I still feel that after a raise, all of the engineering went out the window, and the bus would no longer be safe. Just my $.02
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Old 06-24-2015, 10:55 PM   #22
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They weren't necessarily heavily modded. Just old worn out buses with lots of the ribs cut out.
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Old 06-25-2015, 02:11 AM   #23
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Quote:
Originally Posted by crazycal View Post
I don't want to start a crap storm but this is one reason I am against a roof raise. Some just don't have the structural engineering experience to do the job properly, like me. I don't always admit my shortcomings but when I do, I prefer Dos Equis...and defer to the school bus engineers.

That's why I lifted mine and installed windows the way Blue Bird would have if a bus had been ordered to the specs I needed.

Only every second rib can be cut for window placement.

That's how Blue Bird builds it's trip buses with large horizontal RV style sliders.

Nat
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Old 06-25-2015, 08:04 AM   #24
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an 80K pound truck rolling at 75 mph, will destroy school buses with or with out ribs, it's the law of physics
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Old 06-25-2015, 01:33 PM   #25
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Ever so slightly off topic, but I came across this video of a Class C motorhome crash test while reading an RV site urging people to wear seat belts while underway:



The dummy in the overhead loft wouldn't have faired so well...

The vehicle was only travelling at 48km/h (30mph).
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Old 06-25-2015, 01:56 PM   #26
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More fun crash test videos of a Class C with way-too-cheery music from Bailey crash tests motorhomes to improve safety | Motorhome News:


^ check out all the stuff flying around. After this one they decided that the fridge and oven needed to be bolted down.. No ****, geniuses...






^ Check out the effectiveness of the seatbelt for the passenger closest to the camera.


^ that's better.

But seriously.. Did they actually need to run crash tests to determine these issues? Seems like common sense...
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Old 07-07-2015, 02:25 PM   #27
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an 80K pound truck rolling at 75 mph, will destroy school buses with or with out ribs, it's the law of physics
If a semi hit a stix-n-staples RV (including mine) like in this accident, it would reduce the RV to a chassis with pieces scattered beyond it.

Nonetheless, Booyah and Crazycal make some valid points about improperly done roof raises: your bus could end up like one of those Carpenters with defective roof welds if it rolls over.

Ben Rosander's book, Select and Convert Your Bus Into a Motorhome on a Shoestring, has a very good chapter on roof raises, including frank warnings about what you need to know in order to do it right. Likewise for some of the threads right here on skoolie.net.

By the time I become proficient enough at welding to raise my roof, I may end up concluding, "Screw it and just duck."
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Old 07-07-2015, 02:40 PM   #28
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Not just Carpenter.

Both of my BlueBirds had every weld broken.

They had vary few loose rivets.

As I always say, Bus body's are meant to be riveted together, not welded.

Welds just can't flex and absorb the fatigue that rivets can.

Anyone doing a roof raise would be better off using VHB tape VS welding.

Nat
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Old 07-07-2015, 02:51 PM   #29
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Properly welded, its one piece of steel. what is the shear strength of a rivet or a bolt?
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Old 07-08-2015, 03:17 AM   #30
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Properly welded, its one piece of steel. what is the shear strength of a rivet or a bolt?
However, pieces in a bus body need to stay flexible so that they don't crack, rip, ect.

Also, no weld in any bus I have ever seen was welded properly.

Galvanized metal, haste of production, lack of surface prep, welds in poor locations, ect.

If a multi million dollar bus manufacture can't get the welds right in a production shop, how do you think your little Chinese welder is going to do welding outside in the elements, with a unskilled do it DIY guy running it?

Bus body's are build with rivets for a reason.

This is pointed at no one directly. This is posted mainly for the new members.

I'm trying to emphasize to the new folks that you don't need a welder to do a roof raise. Far too many fear and don't raise the roof due to this non sense.

Let's open possibility, not close the door on them.

Nat
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