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Discussion Starter #1 (Edited)
Reverse Logic sells three types of service and trailer ramps - constant incline, two-stage incline, and progressive incline. Constant incline ramps have one slope the entire length of the the incline portion of the ramp. Two-stage incline ramps have an initial incline that is less than the slope near the top of the ramp. Progressive incline ramps feature a gradually increasing slope. For example, the RLL-99 ramps start out at 3.5 degrees and increase to 8 degrees just before the platform.

The attached drawing demonstrates the advantage offered by the curved top surface of the RLL-99 ramp. A constant slope 3.5˚ incline ramp (green outline) with the same 8" high platform as the RLL-99 ramp would be more than 36” longer. The curved top surface allows the RLL-99 ramp to be much more compact than a ramp with a constant slope.

The RLL-99 Progressive Incline Ramps are 99” long by 14” wide with an 8” high platform. The optional Trailer Ramp Adapters convert the incline sections of the ramp into trailer ramps which are 80” long by 6.7” high.
 

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Discussion Starter #3 (Edited)
Some customers lament that the Reverse Logic Progressive Incline Race Ramps only have a platform height of 8". If the front of your car needs the low incline of the RLL-99-2 progressive incline ramp to work with the approach angle on your car, it is very unlikely that you could back up on to a platform higher than 8" without scraping your front bumper against the pavement.

With a constant incline ramp, the car-to-ramp clearance when the ramps are pushed up against the front tires is the minimum clearance you will encounter. As a car climbs a constant incline ramp, the clearance will increase until the front edge of the car passed over the platform stop. This is not the case with the progressive incline ramps since the slope of the ramp increases as the effective approach angle increases when the car climbs the ramps. Technically, a different progressive incline ramp would be necessary for every combination of wheelbase, front overhang, and ground clearance. Currently Reverse Logic only offers one progressive incline service ramp, the RLL-99-2. The perfect shape of progressive incline ramp for a given car would maintain the same car-to-ramp clearance over the entire length of the ramp. Since we only offer one progressive incline service ramp, the car-to-ramp clearance will increase or decrease slightly as the car climbs the ramps. A reasonable amount of clearance would be 10mm to 20mm over the length of the ramp.

Trailer ramps are a little trickier than service ramps since there are additional variables to consider beyond the wheel base, overhang, and ground clearance of the car. Factors like trailer deck height, door length, and dove tail dimensions (if any) enter into the equation. For this reason we offer three progressive incline trailer ramps to accommodate various car/trailer combinations. The first ramp is the RLL-99 incline section from the service ramp combined with either a trailer adapter or trailer ramp extension. The second is the 114" RLL-TR-114-2 with an initial incline of 2.6 degrees and a height of 9". The newest progressive incline trailer ramp that we offer is the RLL-TR-105-2. This ramp has an initial incline of 2.2 degrees and a height of 6.3". The 105" ramp will accommodate a very low ground clearance car, but, it requires a trailer with a relatively low deck height.
 

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Discussion Starter #4
Here's a good YouTube video showing a Radical SR3 with about 2" of ground clearance being loaded onto a trailer with the RLL-TR-114-2 custom Race Ramps from Reverse Logic.

 
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