Giant_Scale_Gasser

My Feedback: (84)

I think I have my one-way valves (or check valves) too far from the mufflers. After I ground test the smoke then switch the pump off, she continues to smoke for a short period of time, maybe 30 seconds or so. Testing the valves off the airplane, they both seal like they should when introducing pressure in reverse.

The question is, how close should the checks be to the mufflers? I have about 8 inches of smoke tubing from the muffler nipples to the checks. I am thinking the residual oil in the lines from the check to the mufflers is what is causing the continued smoke (albeit lightly) after the pump is switched off.

Any thoughts on the location of the checks?

Steve

My Feedback: (54)

I quit using the check valve long ago. But when I used one, it was just on the other side of the Y from the mufflers. Smoke for a short time after the pump is off is normal.

K-Bob

My Feedback: (1)

It's probably just taking that long to burn off residual fluid in the tubes and/or mufflers. Lower your pump flow rate, it will save you $ on fluid and make less of a mess on your plane.

Giant_Scale_Gasser

My Feedback: (84)

Thanks I did notice the pump was 100%. She sure can lay down some smoke like that! I will play with rates to find a happy medium. I only put a 16oz smoke tank in her, so the smoking portion of my flights will be limited no matter what so lower rates on the pump will be a plus.