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Engine basics => Engine set up tips => Topic started by: James Mills on May 12, 2007, 08:58:21 AM

Title: Run time on PA 61
Post by: James Mills on May 12, 2007, 08:58:21 AM

Some of you guys have posted that the mileage gets better with run time.  I have a PA 61 that I struggle to get the pattern finished on 6 ounces fuel, maybe 30 to 40 flights so far.  How much run time will it take untill the mileage increase will be noticed?

Thanks,

James #^

Title: Re: Run time on PA 61
Post by: Bill Little on May 12, 2007, 07:08:05 PM

Hi James,

Wish I could give you a good solid answer, but I can't.....
I guess a lot depends on what part of the country you're in , or more so what the density altitude is.  I sometimes pull fuel out of our PA 61s using a 6 oz. tank. (??)  We have three of them, with a good bit of time on them, but no where near being used up.  NC, 300-600 feet ABSL, usually we have high humidity and fairly hot...... even with 10% nitro, 6 oz. has always been plenty.
??

Title: Re: Run time on PA 61
Post by: James Mills on May 12, 2007, 08:48:57 PM

Bill,

I live in Missouri and have been running 10%.  Not sure what venturi size (whatever Randy put in it when I got it from him).  Power has not been an issue. 

Thank,

James

Title: Re: Run time on PA 61
Post by: RandySmith on May 12, 2007, 09:13:16 PM

Quote from: James Mills on May 12, 2007, 08:48:57 PM

Bill,

I live in Missouri and have been running 10%.  Not sure what venturi size (whatever Randy put in it when I got it from him).  Power has not been an issue. 

Thank,

James

Hi James

This time of year we run 5% nitro, power should be no issue with 5% fuel in the spring, or you may want to try that or  just put in a bigger fuel tank

Randy

Title: Re: Run time on PA 61
Post by: Norvaldo on May 22, 2007, 12:49:27 PM

Beeing no expert at all but i have noticed the following on my PA .61:

NB: It is a SE run with muffler. We fly the FAI program  = 7 Min .

I fill 130 ml = 4.396  oz.  5% nitro 20 % oil Apr. sea level and 15-20 degrees Celsius 13x5.25 wood prop.
The run is 4 stroke breaking to rich 2 in maneuvers.
This gives 6 1/2 min runs on average..
I notice that run time increases on leaner and decreases on richer settings.

The pattern usually takes 5 1/2 min.

It uses less fuel now than when new, but i have put in one extra shim and gone from 10 to 5% nitro since then.

One more comment:
Using a 6OZ tank.. have you checked that you actually fill 6 OZ for each flight..?
That is: Is the tank absolutely emty after the run.. ?