chipperg

My Feedback: (9)

Can you confirm my 3% is 7.65 oz for 2gal.

George

My Feedback: (57)

I come up with 7.68

JimBrown

My Feedback: (2)

Same here. 7.68 oz. (US Liquid) in 2 gal. (US Liquid)

Now, if you guys were using the metric system, it would be rather easy. 30 milliliters per 1 liter. No calculator required. (1 liter = 1000 milliliters. 3% of 1000 is 30.)

For myself, I mix up 20 liters at a time. A 3% mix is 600 milliliters. (5% is 1 liter.)

...jim

rcguy!

My Feedback: (69)

Jim,
The USA IS moving towards the metric system "inch by inch!"

BTW...I just bought 12 feet of 6mm cable at the hardware store.....

Dave

S_Ciambra

Hi Jim,
then for 5%, 19 liters kero and 1 liter oil and not 20 liters kero and 1 liter oil...
OK?
Regards

KC36330

That's the way i mix, for 5% i add the quart of turbine oil, then add 4 3/4 gallon Kero.

kc

bob1393

My Feedback: (10)

KC,

I don't believe you have a 5% ratio. 5 gal is 640 oz., and 5% of that is 32 oz. Thus you should mix 1 quart oil to 5 gal, which is 20 to 1, or 5%. You have a 19 to 1 ratio.

My 2c.

Bob

joeflyer

My Feedback: (48)

Some of you guys need to go back to school.

If you have a total of 5 gallons, 4 3/4 gallons of fuel and one quart (1/4 gallon) of oil then you have 5% oil. 32 oz. oil/640 oz. total = 5.00%

If you have 5 gallons of fuel plus a quart of oil then you have a total of 5 1/4 gallons or 672 oz. (640 + 32). 32 oz. oil/672 oz. = 4.76%.

Joe

KC36330

yes 5% of 5 gallon (640 oz) is 32 oz, in order to have a 5% ratio you have to take the 32 oz of Kero away so the total end product is 5 gallon, if you add the quart to 5 gallon you then have 672 oz, not a 5% ratio. and in most cases i mix by the gallon because my turbine oil comes in 7.5oz cans, i mix that to a whole gallon and it's very marginally over 5%.

also a 20-1 ratio is 4.76%, not 5 just so you know.

kc

EDIT: i see i posted the same time as joeflyer with the same responses

to elaborate a bit further 20-1 is a 21 part mixture, as mentioned it's time for some folks to go back to school, Are you smarter then a 5th grader

causeitflies

It's a good thing we don't have to be TOO precise

joeflyer

My Feedback: (48)

At the end of the day your turbine won't be able to tell the difference between a 5% or 4.76% mix. Some manufacturers recommend 2.5% and some 3%, plus there is a certain safety factor in what they recommend. Just wanted to clarify the math.

Joe

KC36330

yea my JetCats says approximately 5% so 4.76% for those running it that way probably isn't going to reduce engine life considerably opposed to 5%

kc

afterburner

My Feedback: (18)

Is it apparent to anyone else after reading this thread that there's nothing happening in the RC Jet community this evening?

Marty

KC36330

must have something to do with those 40mph winds we had here today put a hampering on flying.

kc