These pipes are double walled , using ligther materials than used on the standard pipes. We use extra thin stainless steel  for the inner pipe and extra thin aluminium for the outer pipe. Such a double walled pipe with a length of 420 mm weighs just 114 grams !

The lengths in the shop are total lengths of the pipe. As the turbine reaches inside the aluminium inlet of the pipe, the length of your pipe needs to be calculated as follows:

For 15-30N pipes
Measure from turbine exhaust cone to the end of the plane`s nozzle PLUS 20 mm


Example: you have a P20- turbine and measured a distance of 250 mm from your turbine outlet to the end of the plane, you add 20 mm, so you need to order a pipe with a length of 270 mm.
Download installation guide for your Grumania pipe below the chart

                    You need help ? Call us !   0049 7123 380988

Please note, that jet pipes are tailor made itmes and not stocked.Double check what you order- we do not accept returns.