Turbine Oil

[sdennison]

Have a friend building a garden tractor with a turbine from an APU and he needs some MIL-L-23699 oil or the equivalent.

Suggestions? Thanks,

[Second Air Force]

I originally thought this oil would cross to 2380 or 2197, but I don't see a cross for it. 23699 is used by Bell Helicopter, so check with the local FBOs or oil wholesaler. I'm going to be at my oil supplier this week and I'll check with him to see if he carries it.

Scott

[sdennison]

We found an older spec MIL-L-7808. Know what the difference is?

[b29flteng]

BP2197 meets Mil-l-23699. Any FBO can supply you with an oil that should meet that spec.

[Second Air Force]

We found an older spec MIL-L-7808. Know what the difference is?

23699 is the replacement for 7808, and, as B-29flteng just posted, your troubles are over as 2197 is easy to get.

As for your friend's project, a guy in Oklahoma built a zero-turn mower with an apu engine a few years ago. Interesting machine.

Scott

[retroaviation]

Mentioning these turbine powered mowers without posting pictures is just plain rude.

Gary

[Second Air Force]

I don't have anything on the Okie-grasshopper-jet, Gary, but here is a link to another version.
http://www.youtube.com/watch?v=zBJu2q3sDrw



(Do you suppose anyone would miss a spare Garrett that we just happen to have hanging in the airplane in my dock at work? )

Scott

[Sabremech]

Hi Scott,
There's a long list of oils that meet this Mil spec. Here's a short list of what you can use: Exxon 2380, 2379, 2197, Mobil Jet II, Mobil 254, royco 899 just to name a few. Exxon 2380 is the easiest to get I've found.

David
WHF Maint

[Second Air Force]

Thanks for the full listing, David. I admit I was too lazy to really check cross references. What do you use in the J-47 nowadays?

Scott

[Sabremech]

Hi Scott,
We use Royco 481 which is grade 1010. At full power the oil pressure is barely 17 psi.

David
WHF Maint

[b29flteng]

Mentioning these turbine powered mowers without posting pictures is just plain rude.

Gary

How about this...

http://www.marvinbaumann.com/typhoon2.html

[Second Air Force]

Once more proving the versatility of the little Ford tractor!

S

[RickH]

Don't mix these oils ! They are synthetic and according to Shell Oil the esthers in them are not compatible.

MIL7808 meets an AF spec and is a 10 wt. The replacement is the MIL23699, it is used by everybody now and is a 5wt.

According to a GE report, the 7808 is better long term as an anticorrosive but the 23699 should give you longer engine life as it regards wear.

Most civilian oil cans list what MIL spec they meet right on the label.

We now run MIL 23699 in everything, J-79s, J-52, T-53, UH-1 transmission and all gear boxes. We also run it in our GTC-85 turbine AGE units.

[Fouga23]

I don't have anything on the Okie-grasshopper-jet, Gary, but here is a link to another version.
http://www.youtube.com/watch?v=zBJu2q3sDrw

Scott

That guy is just sick! A HOMEMADE turbine he bought on Ebay, no fire extinguishers, propane tanks right next to the turbine,... And I wouldn't come within 10 feet of that thing without being covered in Nomex! That's looking for an accident

[Second Air Force]

Did you watch the other videos of his "experiment", Fouga? You're right, he's

Scott