Originally Posted by
IO540
On a peripheral topic, what would happen if I put say 10USG of avtur in one tank and then topped it off with avgas - say a 1:5 avtur-avgas mixture?
Detonation might be an issue, perhaps?
How far can this be pushed?
I would have thought that avtur would be soluble in avgas; most things seem to be (except water).
If you are lucky it will have been a while since the AVTUR was pumped and since AVTUR is heavier than AVGAS the tank will settle out so the 10 Gals of AVTUR is sitting on the bottom of the tank, the engine will then get a 100% dose of AVTUR , suffer explosive detonation and be utterly distroyed shortly after starting but while you are safely on the ground, If you are unlucky you will try to takeoff while the AVTUR is still settling therefore allowing the aircraft to actually get airborne before the engine gets a slug of solid AVTUR and destroys itself....
The Lycoming website has a section whcih deals with the issue of AVGAS contaminated with AVTUR. It basically says that any engine run with fuel that has any amount of AVTUR must be torn down and completely inspected before further flight