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 Tumbler Axle question |
From: Wayne
| Posted: 6/16/2005 1:41:34 AM
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Tumbler Axle question
I hope someone can answer the question that my friend and I coudln't answer. The promotional material for Tumbler state that Axless front wheels allow more tighter turns.
What does that mean? Does it mean if the turn is turned left then only the left wheel is turned and not the right wheel?
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From: Jack
| Posted: 6/16/2005 1:49:19 AM
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RE: Tumbler Axle question
No. The design of the front doesn't use a center crossmember to hold the suspension parts. The Axles are mounted from the outside of the wheels. Does that design allow it to make sharper turns, I don't know especially with those big fat tires on the front. The quicker turning would come from the tires being closer together in this design or if the wheels can be turned more then the conventional crossmember set-up. Clear as mud, right? 
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From: Webmaster
| Posted: 6/17/2005 7:34:45 PM
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RE: Tumbler Axle question
Someone left this comment at the tumbler page:
Since this was designed for the military, I have to assume Wayne Enterprises is a slime-ball contractor. So let's analyze this slime ball contractor's proposed vehicle:
2.5 tons = 5000 lb, big deal. That's considered a light tactical vehicle, same category as the HMMWV. The medium and heavy trucks are in the 10k to 30k lb range.
Hoosier race tires, big woop. No one uses them anymore in mainstream racing. You better get some rain tires at the minimum, drag slicks are useless on the road.
Jet burner? Did he mean a gas turbine based jet engine? Which sucks gas like no tommorrow? Where is the fuel tank? How large is the fuel tank? 20 gallons? 40 gallons? 100 gallons?
Everything else looks cool but:
Axle-less front end with conventional single axle rear end = RWD, plain and simple. What's the big deal about this setup? In the movie it was running over cop cars and stuff... SO what happens when the rear end somehow gets lifted up? It gets stuck and is easy prey for RPGs. There's not much ground clearance so as soon as it hits a small vehicle or object it will lose traction for just a tad.
Assuming it is running a spool or Detroit Locker, then if one rear wheel gets lifted up, it can still go to a certain extent. Otherwise, if it has a viscous coupling limited slip differential or a torsen differential, it may run into problems.
Oh yeah, what about armor? It weighs 5000 lb. Most of that weight is probably the main powerplant (diesel no doubt) and the gas turbine jet engine, the 100 gallon fuel tank, the machine guns, the ammunition, the ammunition storage, landing hook, flaps, thrust vectoring assembly, wheels, etc... leaving hardly any room for steel or aluminum armor or ballistic glass necessary to stop 14.5mm bullets or even 12.5 mm bullets.
You're looking at a realistic weight spec of around 8 tons.
I'd also add 4x4 at the bare minimum, with side skirts to prevent tire blowouts from small arms fire, ballistic glass, 1" aluminum armor, and probably a 40 gallon gas tank for maximum range.
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From: Earl Cooper
| Posted: 12/8/2005 12:03:29 PM
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Posts: 66
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RE: Tumbler Axle question
I think the Tumblers improved turning comes from its ability to lock its rear wheels on either the right side enabling it to make a much sharper turn than conventional cars in which both rear wheels spin through the turns.
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From: 2wylde
| Posted: 12/8/2005 12:45:36 PM
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GOTHAM MATT
Posts: 377
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RE: Tumbler Axle question
That was an answeome answer. I guess the film guys missed all that in their quest for a believeable/explainable storyline. A movie car is a movie car. It's only cool if it can do unreal things. Like the whole rooftop scene  (which I always thought was cheesey). Anyway, the vehicle looks cool - they did accomplish that much. Can it go fast, sure. Can it stop bullets and drive iver cars etc? No.
Long live the 89 
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When I die, I want to die like my grandfather, who died peacefully in his sleep. Not screaming like all the passengers in his car.
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From: Dee
| Posted: 12/8/2005 12:48:36 PM
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Born 2 Drive
Posts: 1409
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RE: Tumbler Axle question
Let's be honest. It's a movie car and it's cool. I know we scrutanise the 89 to the end but what that guy said about the tumbler...I think he needs to sit back, have a Coke and a smile. We don't care how much the bullets weigh, if the tyres are out of fashion or if he can eat a doughnut without licking the suger off his lips whilst driving. IT'S A MOVIE..ENJOY IT.
89 Coming Very Soon
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From: 2wylde
| Posted: 12/8/2005 12:50:58 PM
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GOTHAM MATT
Posts: 377
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RE: Tumbler Axle question
I think if you go frame by frame in the rooftop car chase scene you can see him with a powdered sugar donut. He looks to be trying to get the sugar off the steering wheel.
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When I die, I want to die like my grandfather, who died peacefully in his sleep. Not screaming like all the passengers in his car.
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