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Old 22nd April 2010, 10:30   #106
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Default Suspension

Quote:
Originally Posted by SPIKE ARRESTOR View Post
Hi Arka,

"Front suspension release", I didn't get you. Can you elaborate?

Spike
Hi Spike,

On a Uneven (undulating) incline the weight is on the Rear Axle (considerable portion) and the Front Shackle opens (becomes vertical), thereby changing the COG, and when this happens rapidly the vehicle flips backwards, in the above case the First Two attempts I was too fast and the vehicle slid to the left.

Regards,

Arka

Last edited by ex670c : 22nd April 2010 at 10:33.
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Old 22nd April 2010, 10:47   #107
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Default Flip flop

Quote:
Originally Posted by ex670c View Post
Hi Spike,

On a Uneven (undulating) incline the weight is on the Rear Axle (considerable portion) and the Front Shackle opens (becomes vertical), thereby changing the COG, and when this happens rapidly the vehicle flips backwards, in the above case the First Two attempts I was too fast and the vehicle slid to the left.

Regards,

Arka
Just to add to it, the gradient was high and the approach had a bump at an angle where the rear of the jeep was touching ground and nose towards the sky. The surface was hard. To clear the hill speed was required as it couldnt be done slowly. In 3rd high as Arka charged the front wheel almost lifted and the rear was at it limit in terms of departure angle.
It is to be noted that Arkas jeep has rear auto locker and any extra uncontrolled power here with out wheel slip would have flipped the jeep. But as it was sand it slowly gave way creating extra wheel slip, the climb was conquered. The rest followed.
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Old 22nd April 2010, 11:15   #108
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Post Obstacle 1

Attaching the pics first.. Will give the write up later....

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Old 22nd April 2010, 11:27   #109
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Post Obstacle 1 contd..

Some of the continuous shot images...
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Old 23rd April 2010, 10:15   #110
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Default Obstacle 2

A steep descent in very loose sand.
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Old 26th April 2010, 11:03   #111
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Post Run Up

Quote:
Originally Posted by vinod_nookala View Post

Learning-
  • 3rd high best for charging a slope with best torque and speed. One can also try 1st high as the speed is slightly higher.
  • Avoid reverse low as the gearing is too low. Reverse high best to have a quick exit.
  • Always deflate tyres once you enter dry sandy river bed. Merely locking hubs and engaging 4wd is not enough.
Vinod,

About your first point, it becomes critical to judge the proper runup for each obstacle especially in Palar.

I have seen 4X4s take to long of run up hoping to have extra momentum and in that effort loose the momentum in the process.

What we should not forget is that this is sand and once we hit the peak in that gear, over a long distance you tend to ease up that power thereby losing momentum just before the obstacle.

A very good example would be our last obstacle with the steep incline. Some of the vehicles were taking too long of a run up resulting in them actually losing speed by the time they come to the obstacle.

About deflating tyres, maybe the offroaders can have it as an action item to be done when the hubs are locked.
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Old 26th April 2010, 11:19   #112
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Quote:
Originally Posted by fiery enzyme View Post
I have seen 4X4s take to long of run up hoping to have extra momentum and in that effort loose the momentum in the process.

What we should not forget is that this is sand and once we hit the peak in that gear, over a long distance you tend to ease up that power thereby losing momentum just before the obstacle.
This is purely a case of driver error than the vehicle's ability.

The vehicle can attain peak torque much before the obstacle, but the driver needs to learn to hold it there and not get carried away!!

Sean Hameed was a classic example of what i'm talking!!!
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Old 26th April 2010, 11:27   #113
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Talking

Exactly. I never said it is the vehicle. All I'm seeing there is no need to take exaggerated run ups when it is not needed.

Of course the vehicle is more than capable

Last edited by fiery enzyme : 26th April 2010 at 11:34.
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Old 26th April 2010, 11:52   #114
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Default Pics Contd

Had no access to Internet in the last couple of days so could not post the rest of the pics...

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Old 26th April 2010, 12:06   #115
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Old 26th April 2010, 12:27   #116
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More Pics from the Steep Climb

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Old 26th April 2010, 12:33   #117
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Tini's Scorpio Charging its way through the climb

TPC10 - India's Toughest 4x4 Off-Road Competition-20100418-13.35.52.jpg

TPC10 - India's Toughest 4x4 Off-Road Competition-20100418-13.36.33.jpg

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Old 26th April 2010, 13:24   #118
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This last climb is where the mhawk really proved its mettle. Completely no fuss. I'm floored.
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Old 26th April 2010, 13:32   #119
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Quote:
Originally Posted by fiery enzyme View Post
This last climb is where the mhawk really proved its mettle. Completely no fuss. I'm floored.
Oh you are - Its the driver bala, not the mHAWK - what say tini?
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Old 28th April 2010, 21:02   #120
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Arka,

Can we have some details for the second recce like what is the timing, meeting point etc.
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