I have used Brodak's fuel for six or seven years now without any problems.  I use both 10% and 5% nitro with an 11-11 oil mix.  I'm not certain but I think Cooper manufactures the fuel for Brodak.  Perhaps that's changed?  I've used Powermaster fuel also and have noticed no difference in performance with the same nitro and oil mixes with both fuels.

Joe

I've done extensive comparisons to with Brodak 10/23 and Powermaster 10/22.
I've run them in Fox 35s, both stunt runs and screaming lean.
Also in a 1950 Atwood Triumph.
And, in many 4-strokes, from the OS 20 up to the SAITO 62.

I could never find any difference in performance.

  Bob Z.

Not true. I do quite a bit of flying and now use the Brodak fuel exclusively.
I find no batch-to-batch variation.
I adjust the needle valve no more often than I did with the Powermaster.
My only problem with the Brodak fuel is the container - I prefer a metal can.

Bob Z.

         Our club members have had this disucussion on several occasions. The best way to tell is back to back performance. If the needle has to be dialed in more when using one fuel I would think the proof is right there.

   Oh, that's not necessarily the case. If the viscosity is different, that would also change the needle position without necessarily affecting the power. I think the difference between 10% Powermaster "GMA" and Powermaster "RO-Jett" is about a full turn in on the needle but the RO-Jett fuel has more power and runs about the same time. That's because RO-Jett has much lower viscosity.


     Brett

The amount ...and type.. of Nitro will make for a new needle setting
The amount... and type... of oil will make for a new needle setting
Fuel mixed by weight ,vs volume will have a different needle setting

they are other things that change the needle setting also

Randy