I have an over sized ringmaster ( super lite) it has an LA 40 on it /it will do the pattern Dead Rich . what I would like to do is be able to run it at a higher cleaner setting ,but still be in the 5 sec range .dead lean it is good for a 3.2 sec lap

  where do I start

Lower pitch prop, longer lines, smaller venturi, but I thought you knew all of this...

why would you use a 6 pitch prop? use a  TT 11 x 4.5 , Pro Z  12 x 4,  BYO 12 x 4   APC 12 x 3.75

That will be much more in the range

Randy

why would you use a 6 pitch prop? use a  TT 11 x 4.5 , Pro Z  12 x 4,  BYO 12 x 4   APC 12 x 3.75

That will be much more in the range

  +1

    6" pitch props went out of stunt 30 years ago, for the most part, and if it's running too rich, less pitch is the solution.

    Brett

OK I lied, it is an la 46 ,.257 venture, 11/6 zinger,10/22 50/50 sig fuel,65 ft lines

plane has 620 sq in .span 52 in ,root 12.5 tip 6 .25. 2 in thick at root,  fuse is 29 in long 10.5 elevator to wing trailing edge  nose is 6.5 weight is 32 oz's

That's way freaking light for the size -- which is probably good in a Ringmaster-ish plane.

The 46LA is a Schuerle-ported engine, which is why Brett and Randy are telling you to go down in pitch.  It wants to spin fast; with that prop it'll always be threatening to get on the step and run away from you.  I'd start with the APC 12.25 x 3.75 that Randy suggests -- that'll tend to load the engine and keep it at the low-power end of its range (for contrast, I have a 64-ounce stunter that flies really nicely on an APC 11.5 x 4 that's cut down to 11.25 x 4 -- for that engine, bigger planes want smaller props).

You didn't say what spraybar size you have (it matters, because a bigger-than-stock spraybar uses up more venturi area).  Try it out, and if it wants to run away from you then consider going to a smaller venturi, or piling nylon mesh on the thing to effectively make the venturi smaller.