i thought power master sold it , but not any more , sig doesn't sell it any more either.

See this post: [link=http://www.rcuniverse.com/forum/m_7912710/anchors_7915148/mpage_1/key_/anchor/tm.htm#7915148]BIG ST FUEL, dropped by sig [/link]

Take standard fuel, and add about 3/4 the amount in pure methanol to it. The big tigres need about 10% oil, not more.

your saying , a gallon of 10% nitro 20% castor with 3 Quarts of methane mixed in?

Retailers drop products because they don't sell.
Products don't sell because they are not needed.
That fuel is not needed because regular 18% oil fuel works just fine.

There is no reason why a slightly larger displacement S.T. engine must have fuel with a lower oil content. That is an Internet myth.

The big Tigers have the same ball bearing crank and plain bushed rods as the other S.T. engines.

MY S.T. 3000's run fine on 15% nitro. They are not high compression engines, and they need not be run on low nitro fuels. They run fine on standard 15% nitro, 18% oil fuels.

I have not experienced any detonation or overheating on my big Tigers on 15% nitro.

FBD.

If the fuel has (edit typo): 29 to 20) 20% castor, mix in equal amounts.
The big tigres need only 10% oil, and 8% will do as well.

dave, what type of plane is that?

Each to his own, but why use expensive fuel when the big Tigres run fine on an inexpensive 0-5% nitro / 12% oil fuel using an OS F glow plug?
At least in Europe where nitro is very expensive a lot of money can be saved by following the recommendation by the manufacturer to use fuel with low oil and nitro content.

....which recommendation are you referring to ? Todays recommendation for the 2300 for instance is:

http://www3.towerhobbies.com/cgi-bin...FV80&P=SM#tech

REQUIRES: Propeller: 16x8, 18x8, 18x10
Glow Fuel: Minimum of 18% high quality oil by volume in fuel,
Nitro content should be between 5-15%.
SUPERTIGRE Recommends Fuel with 18% oil MINIMUM.


The plane is a Joe Bridi Big Dirty Birdy. It was an early 2 meter pattern plane. They are rare now, possibly obsolete. I have a new header and long pipe for it now.

FBD.

SuperTigre say that the low-oil recommendation applies to the 3000 and bigger (which means the 3250 and 4500 I guess).

However, if you're using a *decent* oil, you can run 12% in all of them.

We run 12% oil in our G90s here and it goes a very long way towards tidying up the crappy mid-range that these engines often exhibit.

Many, many hours and not a single failure on 12% Coopers oil.

the 4500 manual states using the low oil after break in, i don t know about the 2500.
you cant find this fuel any more, the low oil, i'm just going to add 3 pints methanol to a gallon of
5 or 10 percent nitro 20 castor to get the oil level down after break in , it may not even make a diff, but i'm inclined to go by the manual

The low oil-content recommendation applies to the "big block" Tigres, i.e. the ST-2000, 2500, 3000, 3250, 4500 and 6000, but not the 2300. I do not know why this is so, but I guess it has something to do with power output in relation to conrod bearing size etcetera.

In all cases break-in should be made with "normal" oil content fuel. My experience is that the break in procedure takes quite a long time, i.e, at least a couple of hours running time, but once that is done the engines never seem to wear out. I have an old ST-3000 that has been run for more than 200 hours by now and I have yet to replace any parts, not even the ball bearings. I am using no-nitro fuel with 10-12% Graupner/Fuchs Aerosave synthetic oil (no castor) for this engine. The good thing is that the fuel is quite inexpensive and leaves practically no residue on the aircraft.

ST had an adendum for the fuel requirements (which I have) some while back on the "Big" Tigres. They say to use 10 to 12% ALL castor oil or 18% synthetic/castor blend. I like Flyboy Dave run 15% nitro and 18% blend. I have 2 2500s and 1 2000. My most run 2500 turns a Mezjlik 18X8 at 8900rpm. Several years ago I spoke to Bill Baxter a.k.a. "BAX" and he was running a ST 4500 on 30% nitro for racing.

hey Dave, so thats what your ugly mug looks like!!!!
That big yellow dirty birdy looks like my Bridi Escape on steroids. Nice looking plane, but I would have used pink polka dots.

BTW, the origonal reason that the bigger tigre's got to recommending a low oil fuel was to keep the fire lit on those that had "carb issues" Many of them had horrible midrange richness problems and one of the easy ways to cure that was to cut down on oil content, requireing both needles to be slightly leaned to compensate for the low oil volume in the fuel and sneaking up on a cleaner midrange.
I have found a number of solutions to the few stubborn big tigre's out there. First, a hot fuel and a cool plug, why I have no idea but it seems to work. The other way, with the horribly rich midranges found on some big tigre carbs is to use very low nitro (I like 0% to 3%) and low to regular oil contents.

I figured this all out by accident since I ended up with two ST 3250's at the same time. One ran like crap and the other ran great on "normal" fuel. Playing around with the fuels and plugs made me determine that the carb was the determining issue. Swapping carbs proved it. Moral to the story, some of the big ST carbs were out of tolerance and instead of fixing the problem, hobby services made the recommendation to run low oil fuel which made the problem much less noticable and worked just fine in the other big tigre's that actually had a good carb.

When a carb swap fixes all the engines ill's, fuel is not the issue.

If you have one that does not run very well with the carb you have on standard 10% or 15% fuel, throw away the carb and install a good one.

....yep....that sounds plausible....

....if you notice, my engine has a Magnum carb on it. The carb that came on the
engine looked like it was off a .35 enginge. I threw it in the trash.

I'm still lookin' Ok for a 60 year old maniac....I'll be 62 on Thursday.

FBD.

i have just moved to germany and would like to get into flying planes and cant find out how to get the fuel for it i have the planes but no way to fly it can someone HELP ME thank you.

....find the aero-modelers in your area, ask around. They will help you.

FBD.

Hey Dave. Ever heard of a guy named Red Green.

....nope, can't say as I have. [sm=rolleyes.gif]

Quando Omni flunkus moritati. (if all else fails play dead)

red green , o yea , i watch his show once in a while , he made a pontoon boat out of a van , the guy is off the hook.

Wish I was a Possum Lodge member. [sm=lol.gif]

hey what kind of fuel should i use breaking in my losi 8 rtr.when i get it broke in to race can i change to 30 percent ???