Gents:

I run Byron Gen2 fuels, mainly because they are readily available in gallons at the LHS. Their labels claim that the oil content is a synthetic/castor blend (a good characteristic for my fleet of somewhat vintage OS and Enya motors). However the highest oil concentration in these fuels carried by the LHS is 18%. Thus I end up having to spike the fuel with a 50-50 blend of castor and synthetic to bring it up to higher levels recommended for each of my engines.

There seems to some confusion (at least in my mind) about whether the Byron oil portions stated on the label reflect volume or weight. I've read varying claims. Some state that the content is spot on for volume while others suggest the oil content is weight-based and thus overstated by two percentage points.

Can anyone provide an answer with some degree of confidence? Does this really matter for a sport flyer learning stunt?

Thanks.

Dave Mo...

Walter:

Yup, I too like their fuel and will go ahead and trust their stated measurements as volumes.

Right now, I am bench running for break-in a new/old stock OS Max 35 S. The 10% nitro Byron fuel with the oil blend boosted to 24% seems to do the job with a 9x4 APC prop for break-in. So far, it's got one hour running time with another hour to go. I tried a higher oil ratio (approx. 28%), and the motor didn't seem to like it.

The LHS guy stocking the Byron fuel says that he will only stock the 15% nitro juice from here on out. Not sure what (if anything) that'll mean for these older motors. I've been using 5% and 10% from their line.

But as they say, it's all good!

Thanks.

Dave...

Steve:

Thank-you for the benefit of your experience. I'll just keep an eye on temperatures to see if the 50-50 supplement needs more castor.

Dave...

Walter:

Yup, I too like their fuel and will go ahead and trust their stated measurements as volumes.

Right now, I am bench running for break-in a new/old stock OS Max 35 S. The 10% nitro Byron fuel with the oil blend boosted to 24% seems to do the job with a 9x4 APC prop for break-in. So far, it's got one hour running time with another hour to go. I tried a higher oil ratio (approx. 28%), and the motor didn't seem to like it.

The LHS guy stocking the Byron fuel says that he will only stock the 15% nitro juice from here on out. Not sure what (if anything) that'll mean for these older motors. I've been using 5% and 10% from their line.

But as they say, it's all good!

Thanks.

Dave...

I would be very leery of the fuel blend, The last time i tested Byron's  Fuel it  was  12% oil, at best what they call 10% maybe 14.7 percent.  I would  use the fuel and  add at least  12.8 ounces  to the fuel, roughly 1 percent is 1.28 ounces, this will get you close to 25%, and  15%  fuel will be  no more  than 9 to 10 percent  after you mx it

Randy

Randy:

Speaking here of oil only. That 12.8-ounce boost in a gallon of Byron Aero Fuel listing 18% oil would give us a nominal 31.6% of oil in the mix. I say "nominal" because you suggest that the Bryon oil percentage shown on the jug might be overstated. If so then the 31.6% final blend might too be overstated, with the true oil percentage falling a bit lower (but likely within safe running parameters). Comprendo?

You know this business well enough that I'm going with your suggestion. Thanks.

Dave Mo...

Hi Dave
No its  not going to make 31.6%  oil, 12.8 ounces wll boost it 10%, if the fuel really has 15% oil , it will boost it to 25%, IF  it still  has  12% oil  , it will only take it to 22%,  and IF..  It really has  18% then it will take it to  28% oil
Remember, 1 percent of a gallon is  1.28  ounces, or  just over 1 and a quarter ounce

Randy