0Fred@ReverseLogic

At Reverse Logic we offer several custom Race Ramps in addition to the standard Race Ramps product line. This post features the Progressive Incline Race Ramps which have a curved top surface. We have two models, the RLL-89-2 and the RLL-99-2. Both ramps are 14" wide and share the same 8" high platform. The only difference is the length of the incline sections.

The incline section of the 89" ramps is 65" long and gradually increases from 4˚ to 8˚. The RLL-99-2 incline section is 75" long and the slope increases from 3.5˚ to 8˚. Since the top surfaces are curved, the ramps reach the 8" high platform in less distance than a ramp with a constant slope. If the ramps had a 4˚ constant slope they would have to be 30" longer to reach the 8" high platform.

The incline sections of the Progressive Incline ramps are about the same length as standard Race Ramps trailer ramps, so we offer trailer ramp adapters and extensions to convert the ramps to trailer ramps. The 89" and 99" ramps use the same trailer ramp adapters and trailer ramp extension. The height of the incline section is 6.7".

We offer the trailer ramp adapters with a 2" deep or 3" deep step. The trailer ramp extension is 9.3" high and is available with a 1", 2", or 3" deep step. We stock the RLL-89-2 and RLL-99-2 ramps as well as the trailer ramp adapters in Philadelphia. The trail ramp extensions are a special order item.

The attached drawings include a standard RR-56-2 ramp with a constant 10.7˚ incline as a reference point. A rough rule of thumb for choosing ramp models is:

6" ground clearance - standard Race Ramps
5" ground clearance - RLL-72-2 or RLL-87-2 two-stage incline Race Ramps
4" ground clearance - RLL-89-2 progressive incline Race Ramps
3" ground clearance - RLL-99-2 progressive incline Race Ramps

More details available at http://www.reverselogic.us/ReverseLo...ace_Ramps.html

0Fred@ReverseLogic

With a constant slope ramp it is fairly easy to determine if a given ramp will work with your car. If you can push the ramp up against the front tire and there is at least some clearance between the car and the ramp, then the ramp will definitely work. This is because the clearance will increase as the car climbs the ramp.

Since the wheelbase, front overhang, and ground clearance vary from car to car, technically it would be necessary to have a custom progressive incline ramp for each different car for a perfect fit. Unlike a constant slope ramp, the progressive incline ramps "hug" the car in order to get to the platform height in a shorter distance. You can estimate the clearance between the car and the ramp using a spreadsheet I posted last year. The spreadsheet plots the path of the car over several ramp models.

Here's a link to the spreadsheet. This spreadsheet will help with predicting the clearance you have between the front lip and a given ramp.

http://forums.corvetteforum.com/c6-t...ace-ramps.html

The graph below is a sample output from the spreadsheet.