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Author Topic: Turning Radius  (Read 2952 times)
Busnut83
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« on: December 31, 2011, 07:50:47 PM »

98 prevost 45' entertainer coach,,, will raising the tag  axle allow me to turn tighter... my street is 22' wide with a mail box on the opposite side... I need to back in my drive but the new coach wont quite fit.... The 40 mci9 does?Huh
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Lin
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« Reply #1 on: December 31, 2011, 08:02:36 PM »

As I understand it, raising the tag will let you make a tighter turn in reverse.  I don't know if it will enough for your needs though.  This is merely what I was told.  I never had one to try.
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luvrbus
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« Reply #2 on: December 31, 2011, 08:03:39 PM »

The 339 inch wheel base limits the turning radius on a entertainer raising the tag is not going to help you fwiw it will use up the 42 ft turning radius lol forward or reverse with the overhang on the rear lol

good luck
« Last Edit: December 31, 2011, 08:06:06 PM by luvrbus » Logged

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Busnut83
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« Reply #3 on: December 31, 2011, 08:12:03 PM »

Thanks  thought I would ask before I try to reinvent  the wheel?Huh
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Busnut83
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« Reply #4 on: December 31, 2011, 08:37:12 PM »

sorry  fwiw - HuhHuh?
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chev49
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« Reply #5 on: January 01, 2012, 08:44:59 AM »

I think my next project will be to keep the original length and shorten the wheelbase.... Grin
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« Reply #6 on: January 01, 2012, 09:03:42 AM »

What is the wheel base and turn radious of the 83 mci 9 40' njt??? I just want to compare the difference? Thanks.
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luvrbus
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« Reply #7 on: January 01, 2012, 09:20:38 AM »

Believe it not the entertainer is a lot shorter 51 feet for the MCI 9 it is the overhang and length that kills you, the turning radius is a circle at the wheels the wheel base for a MCI 9 is 285 inches strange huh remove the stop and a 9 will turn in a 45 ft radius or shorter fwiw 

good luck
« Last Edit: January 01, 2012, 09:38:18 AM by luvrbus » Logged

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robertglines1
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« Reply #8 on: January 01, 2012, 10:35:46 AM »

Never  researched the turning radius numbers.  Just know if you place your rear tags where you want to back into drive way ---edge and cut front the prevost comes around quicker than the Mci I was use to driving before.For those that have been in and out of my driveway ;the prevost is easier than the Mci 8 was to get in and out. It can test your driving abilities--. not long or steep. sharp turns, hills with steep banks and ditches.   Bob
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« Reply #9 on: January 02, 2012, 07:48:41 AM »

sorry  fwiw - HuhHuh?

FWIW = For What It's Worth
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« Reply #10 on: January 02, 2012, 09:15:20 AM »

My 95 XL raises the tag slightly to improve the turning radius if I am moving very slowly but some places are just too tight to get in.

Can the mail box be moved? I have almost moved a few myself with out meaning too. Embarrassed

DKO
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« Reply #11 on: January 02, 2012, 10:10:31 AM »

Can the mail box be moved? I have almost moved a few myself with out meaning too. Embarrassed

lol.
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birdarchitect26
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« Reply #12 on: October 20, 2017, 06:51:43 AM »

I was searching for turning radius to build my driveway around a bus. Though this was useful, included the price of a new coach from a few years back, just for shits n giggles.

"For the redesign of its 13 J4500 and E4500 models, MCI enlisted BMW Group Designworks USA, which put together the initial renderings based on MCIs goals and scope. The result is a vehicle with improved aerodynamics, functionality, and curb appeal. From an engineering standpoint (with heavy-duty, proven powertrain options and a solid foundation), its no wonder an estimated 40 percent (or more) of all motor coaches currently in service are MCI models. Below, you get an idea just how long the MCI J4500 really is45.58 feet to be exact. Other worthwhile dimensions include a 315-inch wheelbase, 102-inch width, and a little less than 12 feet in overall height. Standard J4500s have a turning radius of 47 feet, but our model was able to perform the maneuver in 45 feet, thanks to being equipped with MCIs steerable tag axle option. The as-tested price of the Detroit Diesel-powered J4500 we got to testdrive was $640,000."

http://www.trucktrend.com/cool-trucks/1304dp-motor-boatin-2013-mci-j4500-coach/
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« Reply #13 on: October 20, 2017, 07:01:31 AM »

Quote from: robertglines1
It can test your driving abilities--. not long or steep. sharp turns, hills with steep banks and ditches.   Bob

Bob I never had a problem with your driveway in my 45' Setra's!
But then Cody used to say I could move them from one bay of the shop to the other by cranking the wheels sideways and backing up about 3 feet!
Grin  BK  Grin
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akroyaleagle
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« Reply #14 on: October 20, 2017, 12:31:11 PM »

MCI 40-foot 7,8,9: Outside body corner, LH & RH = 50' '7" Outside tire, LH & RH = 47' 6"

Eagle 1,5,10: Outside body corner, LH & RH = 44' 3" Outside tire, LH & RH = 41' 0"

MC-5 a,b,c: Outside body corner, LH & RH = 43' 6" Outside tire, LH & RH = 40' 6"

GM 4106 specs just slightly tighter than the MC-5s, at 42' and 38' 6" respectively.

As you can see, the turning radius of the 35' MC-5 is almost identical to the 40' Eagles.
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Joe Laird
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« Reply #15 on: October 20, 2017, 12:42:08 PM »

Thanks for the spec. Now I feel better missing those turns and clipping the curbs. Sad
Quote
MCI 40-foot 7,8,9: Outside body corner, LH & RH = 50' '7" Outside tire, LH & RH = 47' 6"
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Don F
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DoubleEagle
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« Reply #16 on: October 21, 2017, 07:48:42 AM »

As I understand it, raising the tag will let you make a tighter turn in reverse.  I don't know if it will enough for your needs though.  This is merely what I was told.  I never had one to try.


As Clifford mentioned, raising the tag will not affect the turning radius. The wheelbase between the front axle and the drive axle, and the amount of turning that the front axle can handle, determine how tight the radius will be. The advantage of raising the tag or bogie is less resistance to the turn, less tire scrubbing, and less damage to fragile pavement.
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Walter
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kyle4501
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« Reply #17 on: October 21, 2017, 06:07:11 PM »

For comparison

GM PD4501 --
Outside corner radius - 42' 4-3/4"
Inside radius - 22' 8"
turning width - 13' 10-3/4"
Effective wheel base - 283-5/8"
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RJ
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« Reply #18 on: October 21, 2017, 11:18:46 PM »

. . . the wheel base for a MCI 9 is 285 inches, strange, huh?  Remove the stops and a 9 will turn in a 45 ft radius or shorter, fwiw. 

Clifford -

This is from an old post from 2012, but I'm curious as to where these "stops" are that you mentioned, and wonder if my 5C has them also?

RJ
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lostagain
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« Reply #19 on: October 22, 2017, 07:32:36 AM »

Lifting the tags, or having steerable tags, does help noticeably, because without the resistance of the tag tires, the front tires aren't being pushed straight ahead, they have more freedom to turn. Maneuvering a 45 footer with the tags up or steerable tags in a tight spot is quite a bit easier than one without. Also, the new coaches now have much tighter turning front wheels than the older ones.

JC
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JC
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« Reply #20 on: October 22, 2017, 03:53:53 PM »

Can you just make multiple backing attempts cutting it closer and closer with each attempt?  Backing.  Forwarding.  Are there any damage potentials rolling over stuff with the drivers?  (rear wheels)

My old Crown Supercoach 10 wheeler had the optional 16K front axle and the turning circle was very wide.  Equal to the old Queen Mary ocean liner.  Bad enough right hand turns were out.  Left only.

This resulted in some fore thought while cruising new towns and sights.  It was pretty much impossible to tightly back down, (with safety spotter always) without running over curbs, sidewalks and grass.

Could have enjoyed a much lower Reverse Gear also.  RTO910.
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Dave5Cs
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« Reply #21 on: October 22, 2017, 06:22:27 PM »

RJ turn our front wheels all the way until it stops and look in there you can see the stops where it stops against them behind the wheel. Don't know if ours can be removed without something getting hit by the tire though. Shocks, Airbags etc? HTH Grin
Dave
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uncle ned
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« Reply #22 on: October 23, 2017, 08:20:28 AM »



Be careful with those stops. If you are in a old 4104 with big 24.5 tires and modofied steering gear.

If they get out of adjustment it cuts real sharp. also rubs the air bags and they blow at unexpected time.

Don't ask me how I know but it rides very rough when you put a big block in there to keep it from pumping out all the air while you drive it home.

uncle ned
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luvrbus
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« Reply #23 on: October 23, 2017, 08:24:41 AM »

Just get the adjustment right a 1/4 of an inch makes a big difference in the turning radius   
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« Reply #24 on: October 23, 2017, 10:48:26 PM »

One of the good points of owning a European Bus turns on a penny, well a big one
James
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« Reply #25 on: October 25, 2017, 10:08:58 AM »

The tag axle up or down, does make a difference.

How much? Not much, but sometimes that's all the difference...

Go to a big parking lot, bring some flat markers, like a few pieces of plywood...

Set the coach up turning a circle, steering wheel HARD to the lock, with the tags raised.

Get assistant to place boards against drive tires at 4 compass points.

Leaving steering HARD to the lock, sit still and put tags back down and WAIT for them to fill up.

Spin 'round the circle, noting the increased space from your boards.

You should return to right beside the first one every spin 'round, or you are screwing it up.

For a driver who can place a motorcoach between a bee's knees, it is very rare that the tag ever gets lifted for manoeuvring purposes. Raising the tag on someone's fresh asphalt parking lot is a respectful action.

Happy coaching!
Buswarrior
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« Reply #26 on: October 25, 2017, 02:45:52 PM »

if I do not lift the tags on my driveway the tags will rip up the asphalt . don't ask me how I know that . when I put the coach in reverse the tag axle moves forward about 3 " to help the turn . but only in reverse not in forward

dave   
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