I just got a plane for free from a friend and was wondering what fuel would work best in it. Im pretty sure that the engine is an OS .40.

Im new to airplanes, but ive had an HPI Firestorm for a while now. Is it okay to use the same fuel as the storm in the plane? (its 20% Monster Horsepower)


Thanks a bunch

It'll work but you'd be better off with 15% or less. Depends on what your application is.

20% for an O.S 40 is probably way too much. I'd recommend either 10% or 15% nitro with at leat 18% oil. I personally run PoweMaster 15/20 or 15/18 on all my engines, both 2 and 4 stroke alike.

If push comes to shove you can use that fuel in this engine. Just make sure you run the engine rich so that it doesn't overheat the engine. But on your next fuel purchase I would go to 10% or 15% nitro content.

Ken

10%

I find the little .40 runs best on 10%.

Don't use car fuel in a plane engine because there's not enough oil in it. If your OS is a plain bearing engine then definitely don't use it.

Two options for you:

1) Get some 10-15% with atleast 17% oil content (either synthetic such as cool power or the synthetic/Castor blend such as Omega).

2) If you can find out the current oil content of your Monster HP, then you can add either synthetic or castor oil to it and raise it to 18-20%. Again you may have difficulty finding the oils.

Best bet is to pick up a gallon of 10% or 15%, I don't know about over there but a gallon of 15% Omega is $11 here.

You can get a gallon of 0-5% and mix them too. Watch the oil content. You can pick up a bottle of castor oil from the pharmacy for $6.00

15% Nitro/18% oil..[sm=thumbs_up.gif]

You don't even need 10% nitro. Most people where I live use 5% nitro.

Look on the side of the engine. It will tell you what the engine is.. OS 40, OS 46, whatever. then go to the OS web site and download the manual for that engine and read up on what fuel it requires.

Most OS engines will run just fine on 15% with at least 18% oil blend. The important part of this is the oil blend. Make sure the oil you use is at least 18% and, if it has a higher nitro content, then as Ken said, run it rich until you are finished with that fuel and then get the recommended fuel. Trying to blend your fuel with something else to reduce the nitro content is just a pain and, with the quantity you probably have, most likely less than a gallon, it just is not worth it and you probably will never get it right anyway.

Finish up with what you have, running it rich, and then get something more suitable.

CGr.

morning CGR 34* again heremaybe have to put the ski's back on

Hi Irish.

We've got rain. Raining since Saturday. And, you know politicians... we will still be in drought conditions no matter how much rain we get. Gotta tax us.. GOod old NJ.

AAAAAanyway.. sorry about that rant, it's interesting living in this state after living in several others throughout my CG career.

I finally fixed my Skylark nose gear. I think I may have told you about that, but anyway, two of the bolts came loose, one fell out. So, I had to take the fuel tank and engine out. Pain in the butt with that Skylark, but this time I put some locktite on the nuts before tightening them down. Yeah, should have done that in the build.. oops, assembly.. process (it's an ARF) but I forgot and that caught up to me.. no crash or anything, just that I wanted to fly more than one flight last week.. ha.. and I didn't have my tools with me that day.

I've been looking at that US 60 that the guys have been talking about. It may be my next winter project. I have to finish my Something Extra first. It's about 1/4 finished. I just need to take the time and get it done.

Ok, take care, my friend, and don't worry.. you will get spring weather one of these days.. as we will here.

CGr.