inverted engine
 

have two questions for everyone. first i have an inverted os 46 la on a T.H. voyager is it normal to have fuel drip from the carb the fuel tank is a little higher than the carb but it will run fine at idle throttle all the way up to full. im thinking about a great planes quick fueler to put on because of the cowl would placing the quick fueler lower than the tank and even with the carb stop the fuel from dripping out before startup. second question is the c.g. mine is less than a 1/4 from the desired location is this ok. when the plane is setting still it will set on all three wheels but if i touch the back of the plane it will raise up of the nose wheel and rest on the back of the fuse any help would be great thanks mike

inverted engine
 

Armyrcer,

Putting the fueler lower than the tank won't help the dripping (siphoning). If the level of the fuel in the tank is higher than the carb, it will siphon unless the throttle is completely closed so that fuel can't get into the carb. You could get a cradle and invert the model in it between flights but the fuel might run into the muffler thru the vent line.

I have a small locking forceps that I use to pinch the fuel line near the carb on a tight-cowled bipe that I have an inverted Fox .50 in. You can buy the forceps at Wal Mart, in the sporting goods section. They use them to remove fishooks, they might call them locking pliers.

It sounds like your CG is 1/4" behind the recommended location. The real question is: how does it fly? If it's stable, don't worry about it.

CR

inverted engine
 

Because the centre line of the tank should be level with the centre of the carb then any tank will tend to syphon when it's filled. The best practise is to only fill the tank immediately before you're ready to fly. As you've found, it's impossible to flood an inverted engine from syphoning because it just dribbles out onto the ground. Fuel will syphon faster from an air bleed carb like yours because it doesn't have the second needle to give more restriction.

inverted engine
 

thanks for the help and info will fly tommorrow to see how stable it is going to be again thanks alot