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Progressive Incline Race Ramps


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#1 Fred@ReverseLogic Posted 10 April 2011 - 07:41 AM

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Standard 56" and 67" Race Ramps service ramps have a constant incline slope of 10.75 degrees. Reverse Logic also offers 2-piece, 2-stage incline Race Ramps with an initial incline of 6.8 degrees for low ground clearance cars.

For cars with very low ground clearance we will be offering a new Progressive Incline ramp. The Progressive Incline Race Ramps will have a slope that increases from 1 degree to about 10 degrees over the length of the ramp. The top surface of the ramp is slightly concaved.

The clearance between the front bumper and the ramp increases as the car climbs a ramp with a constant slope. If the ramps are longer than the wheelbase of the car the clearance between the bumper and the ramps will increase to the same amount of clearance as when the car is on level ground.

With the Progressive Incline ramps the clearance between the front bumper and the ramps will remain more or less constant as the car climbs the ramps. The advantage of the Progressive Incline ramps is that the height of the ramps can be greater for a given ramp length. It will be a little more complicated to determine if a particular car is compatible with the Progressive Incline ramps. It's not enough to just know that the ramps can be pushed up against the front tire footprint without scraping the bumper to determine that the car can travel the entire length of the ramps to the platform.

The attached drawing is of a 2-piece ramp that is 89" long by 14" wide with an 8" high platform. The height of the ramp at 16", 24" and 32" from the start of the ramps is 1.5", 2.2" and 2.9".

We intend to offer an optional Trailer Ramp Adapter that can be used in place of the platform section to convert the incline sections of the ramps into a trailer ramps.

The price of the ramps won't be finalized until a few sets are produced. Auto enthusiasts who want a safe and flexible ramp solution for very low ground clearance cars with wide tires won't find a more elegant ramp solution than the Progressive Incline Race Ramps.

If you are interested in the new ramps PM or e-mail me and I will help you determine if your car is compatible with the ramps.

Attached Thumbnails

  • RLL_89_2_v3.png




#2 Fred@ReverseLogic Posted 01 June 2011 - 07:11 PM

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Updated drawings for Progressive Incline Race Ramps.

The attached drawing shows the final version of the RLL-89-2 Progressive Incline ramps that will go into production this month. The only real change from the previous version is that the first 20 inches of the ramp has a constant slope of 4 degrees. From that point to the 8" high platform the slope gradually increases from 4 degrees to 8 degrees.

The second drawing shows the RLL-89-2-TA Trailer Ramp Adapter. The adapters are an option that convert the incline sections of the ramps into trailer ramps which can be used to extend the existing ramps for open or enclosed trailers.

The target price for the RLL-89-2 ramps and RLL-89-2-TA adapters is $415 and $85 respectively. Prices include shipping to any destination in the Continental USA.

Attached Thumbnails

  • RLL_89_2_progressive_incline_ramps.png
  • RLL_89_2_TA_trailer_ramp_adapters.png




#3 Fred@ReverseLogic Posted 12 June 2011 - 10:13 AM

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The attached drawing demonstrates the advantage offered by the curved top surface of the RLL-89-2 ramp. A 4 degree constant incline ramp (red outline) would be more than 30 longer than the RLL-89-2 ramp in order to provide the same 8 lift. The curved top surface allows the ramp to be much more compact than a conventional ramp with a constant slope. At 120 long, the 4 degree incline ramp would also be very expensive as well as awkward to store and transport.

The RLL-89-2 Progressive Incline Ramps are 89 long by 14 wide with an 8 high platform. The ramps have an initial incline of 4 degrees which gradually increases to 8 degrees just before the platform. The optional RLL-89-2-TA Trailer Ramp Adapter converts the incline section of the ramp into a trailer ramp which is 70 long by 6.7 high.

RLL-89-2 ramps are now available. More details at http://www.reverselo...Race_Ramps.html

Attached Thumbnails

  • 4degree_outline_v7s.png




#4 Fred@ReverseLogic Posted 22 June 2011 - 07:34 PM

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I have  a spreadsheet that will help determine which ramp a particular car can climb without scraping. The spreadsheet graphs the path of the nose of the car against the shape of the ramp. There are four ramps included in the spreadsheet.

1) RLL-89-2 Progressive Incline Race Ramps with 4 to 8 degree incline.
2) RLL-87-2 Two-Stage Incline Race Ramps with 6.8 and 10.7 degree incline.
3) RLL-72-2 Two-Stage Incline Race Ramps with 6.8 and 10.7 degree incline.
4) RR-XT-2 Standard 67" Race Ramps with constant 10.7 degree incline.

There are three values in green cells that can be changed.

1) Overhang length. This is the distance from the front axle to the furthest point forward in the 14" wide path of the tires. This is NOT the distance from the edge of the front tire footprint to the furthest point forward.
2) Wheelbase.
3) Overhang height. This is the height at the same point as #1 when the car is on the ground.

Changing these values will update all four graphs at the same time. If the red line (path of car) is higher than the blue line (shape of ramp), then the car will clear the ramps. You can scan the yellow row of data points for each ramp to get a better idea of how much clearance you have with a particular ramp.

There are a lot of factors which could affect the results, tire pressure, passengers in car, slope of ground, etc. A good rule of thumb would be to choose a ramp that offers 1/2" clearance minimum at any point along the ramp.

If you have an air dam on the car, you can run a separate calculation for the air dam overhang length and height.

The attached graph is a sample of the output from the spreadsheet. NAGTROC does not allow posting of .xls files. If you are interested in getting a copy PM or e-mail me.

Attached Thumbnails

  • RLL_89_2_graph.png






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