I have a Royal .46 that keeps dieing right after takeoff. It will taxi and run on the ground all day long but as soon as it gets no more than 20 ft off the ground it completely dies without any warning. It runs smoothly across the entire throttle range (on the ground). What is causing this and how do I fix it?

When still on the ground, hold your plane vertical and see if the engine cuts off?

Usually when engines do this, they are too lean or the clunk is stuck in the front of the tank?

Enjoy,

Jim

Is your engine mounted upright ? You may not have enough pressure to the
fuel tank.

Dave.

Yes the engine is mounted upright. It's in a Kadet SR. I have a little repair work to do before I can try anything. The last one pushed the nosegear back into the fuse a bit cracking/breaking the firewall, bottom of the fuse, and the tank supports. What kind of pressure are you talking about? How do I check?

You have a line running from the muffler to the fuel tank vent, right ?

Start the engine up, and get it running full blast. Pull the fuel line off the
carb and see if you have a good stream of fuel coming out. The engine
will quit after a couple seconds....but you should have plenty of fuel
coming out.

Sometimes on a upright carb set-up, you have to set the carb really rich.
The carb is way higher than the tank....it will tend to lean out on you when
you take off....it may seem OK on the ground, but it's not. You must have
good tank pressure on an upright engine.

FBD.

A line needs to be hooked up between the muffler pressure fitting and the fuel tank vent fitting. All other holes in the tank need to be pluged so that the tank will be slightly pressureized by the muffler pressure. This will provide much better fuel flow to the engine and it will not be so senitive to attitude changes changing the mixture.