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General control line discussion => Open Forum => Topic started by: jeffindayton on June 15, 2006, 08:59:26 AM

Title: Fuel consumption- ounces per minute?
Post by: jeffindayton on June 15, 2006, 08:59:26 AM

did not see any thing related to fuel burn times, thought maybe we could post some averages with this type format.

Ounces of fuel

run time

percentage nitro

engine size

I ask this as a newbee to c/l and would like to build a tin tank close to 8 minute run time.  ???

Title: Re: Fuel consumption- ounces per minute?
Post by: Jim Thomerson on June 15, 2006, 09:10:48 AM

With a Fox stunt 35, 10% nitro 25% castor Sig Champion fuel, 4 ounces will get you through a stunt pattern with @ 10 extra laps on a cool, dry, high pressure day.  On a really hot, wet, low pressure day, it may take only 3 oz.  So weather is a factor if you are going to have to run the engine to get maximum power.  Flying a pattern takes around 6 minutes, I suppose.

Title: Re: Fuel consumption- ounces per minute?
Post by: L0U CRANE on June 16, 2006, 05:09:57 PM

Jeff,

Go with Jim Thomerson's guide for starters. You may find some more differences due to altitude, as well. Nitro and oil % can also affect time per ounce, and I don't know of a rule of thumb for these that will work for all engines and conditions.

Run-time vs ounces fuel is not usually as critical for stunt fliers. Usually the tanks are a bit too big for the thirstiest conditions you'll face, and you limit run-time by underfilling it. We only need enough to complete a pattern plus several laps, and not so much we run over-time. Pretty loose limits.

Good sized syringes (e.g., 5 fl oz) let you fill the tank, then draw a measured amount back out to get a certain amount in there. Trying to presume it is empty, and fill a measured amount, is not as sure.

Title: Re: Fuel consumption- ounces per minute?
Post by: john e. holliday on June 17, 2006, 01:25:26 PM

As several have stated you have to take a lot of things into consideration.  The type /make of engine.  The fuel, plug and prop.  And of all things the airplane design.  Old Time for me and the Dragon is 2 and 3/4 ounces of fuel.  The Falcon 35 with OS FP-35 is 3 and 3/4 ounces.  The DoodleBug with OS FP-40 is 4 and 1/2 ounces.  The Accentor with the RO-Jett BSRE-40 is a little less than 4 ounces.  Now the ARF Oriental with 4 ounce tank and Brodak 40 will not get me thru the 4 leaf clover.  All above run on 10% nitro.  The RO-Jett is being run on pure synthetic oil fuel by Power Master.  Now you see what we mean when we say it depends on a lot of things.  DOC Holliday

Title: Re: Fuel consumption- ounces per minute?
Post by: RC Storick on June 17, 2006, 11:29:14 PM

PA .61 1.1 oz per min. PA.75  1.6 oz per min 10% on both.