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Old 02-27-2007, 05:51 AM   #1
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I have a 05 Vectra 40AD. Does anyone know how to calculate the turning radius and maxium swing?
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Old 02-27-2007, 05:51 AM   #2
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I have a 05 Vectra 40AD. Does anyone know how to calculate the turning radius and maxium swing?
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Old 02-27-2007, 08:29 AM   #3
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SMIES - I found this formula on another forum (don't remember which). Not being a mathematician, I can't vouch for it, but I get believable results from it.

(Track in inches divided by 2 + wheelbase in inches) divided by SIN of turn angle in degrees times PI divided by 180. This yields turn radius in inches.

I have it in Excel as: =(B26/2+C26)/SIN(E26*PI()/180)/12
Where B26 = Track in inches
C26 = Wheelbase in inches
E26 = Turn angle in degrees

The final divide by 12 (/12) is to give redius in feet.
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Old 02-27-2007, 12:36 PM   #4
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Tom,
Thanks for the info. What defines the track?
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Old 02-27-2007, 12:56 PM   #5
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Stan, that's the width between the front wheels - don't know if it's to the outer edge of the tire or what, but the outer edge would give you "worst case". I just guesstimated mine at 80" since I couldn't find it published anywhere and I keep forgetting to measure it. With my 228" wheelbase and 50 degree wheel cut, it gives me a turn radius of 29.2', which I think is about right.
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Old 02-27-2007, 01:13 PM   #6
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Thanks for you help Tom. Now we can pour the pad for the MH
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Old 02-27-2007, 01:22 PM   #7
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Hi All,
FYI, I ran this out in CAD a while back for our coach, which should be the same for an 05 40 AD. The curb-to-curb turning distance assuming that you start parallel parked against one curb should be 54 feet. Remember that the rear will overhang at the beginning of the turn and the front end is going to overhang the opposite curb as you complete the turn. The turning radius to clear the mirrors should be 36.5 feet or 73 feet (diameter) if you are between two parallel walls doing slow donuts. Still pretty tight and you feel like your moving sideways in a tight turn.
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