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rotorwrench · 06-20-2012, 02:42 PM

100LL is pretty much clear before they add the blue dye. 100/130 has not been available for a long time (green dye) and the 80/87 (red dye) is only available in a few places now days. There are some STCs (supplemental type certificates) that allow auto or Mogas use in certain aircraft engines per the instructions in the STCs but the aircraft engine manufacturer's won't approve it. It's generally for engines with 8.0:1 compression ratios or lower. FAA/DOT regs & Mil-Specs/ASTMs still prevent use of any alcohol (more specifically ethanol) in avgas thank god.

JP-5 is Navy fuel developed for aircraft carrier duty. It has a higher flashpoint than JP-4. The JP-4 is used by land based forces most notably the US Army for Helicopter fuel. The US Air Force is trying to switch over to a semi synthetic jet fuel called FT. There were special fuels for the XB-70 and SR-71 but both are now out of service with the ill fated XB-70 never making it to service. If they are still flying the U-2, it has a special blend for high altitude.

All US based civillian jets use Jet A. Jet A-1 is a foreign blend and Jet B is for extreme cold weather use to prevent jellation.

06-20-2012, 02:42 PM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: Use of avgas? 100LL is pretty much clear before they add the blue dye. 100/130 has not been available for a long time (green dye) and the 80/87 (red dye) is only available in a few places now days. There are some STCs (supplemental type certificates) that allow auto or Mogas use in certain aircraft engines per the instructions in the STCs but the aircraft engine manufacturer's won't approve it. It's generally for engines with 8.0:1 compression ratios or lower. FAA/DOT regs & Mil-Specs/ASTMs still prevent use of any alcohol (more specifically ethanol) in avgas thank god. JP-5 is Navy fuel developed for aircraft carrier duty. It has a higher flashpoint than JP-4. The JP-4 is used by land based forces most notably the US Army for Helicopter fuel. The US Air Force is trying to switch over to a semi synthetic jet fuel called FT. There were special fuels for the XB-70 and SR-71 but both are now out of service with the ill fated XB-70 never making it to service. If they are still flying the U-2, it has a special blend for high altitude. All US based civillian jets use Jet A. Jet A-1 is a foreign blend and Jet B is for extreme cold weather use to prevent jellation. Last edited by rotorwrench; 06-20-2012 at 04:01 PM.