I just came across the in-flight mixture control offered by Bob Violett Models. This is apparently intended for ducted fan installations, but I see where one is installed on a Moki in an IMAC model as a convenience for needle setting without having to cut another hole in the cowl. I have an Aviastar 1.50 with a sensitive needle, and I notice a very significant change in mixture between full tank and low tank--enough so that I've had trouble finding a setting that will give me good performance through a ten-minute flight. Has anyone used this device for managing temperamental engines?

I would probably look at a regulator/pump setup first rather than in flight mixture control. Then you could also have the tank on the C of G and not have the trim change as the tank empties plus it would be less to muck around with during the flight.

I know a pump will improve my needle function considerably, and I have one that I'll install before this engine flies again. Still, the possibilities for in-flight mixture control are intriguing, and I'm just looking for any real world experiences anyone might be able to tell about. The tank will stay where it is, and CG effects are not a problem. One more thing to muck around with is a consideration, and if it weren't for that I'd probably go right ahead with it. I'm wondering if anyone who's done it will say that the benefits are worth having one more control to input in flight. I'm thinking of engine problems I've had in the air that this might have fixed, times when I've brought the model down to adjust the needle.