Ok, thanks again guys. And thank you Ken, again. I totally agree with everything written above, and I agree that I have been doing too much too fast (hence the other post). I am happy that I have the Decathlon, and after reading (again) what's above I am even more happy because I will learn to fly a plane, not drag one around behind a mammoth engine. Maybe the 46AX is a lot for the Dolphin and it's what I got used to. To do maneuvers with the Decathlon I have to build up speed, i.e. get more air flowing over the wings. I was just hoping that I could do this without needing close to full throttle all the time, and maybe after flying the plane more I will learn to do so.

I removed the one-way valve. At first there was no pressure outlet, so fuel was dumping through the carb like Ken said. Then I removed the plug from the extra line (that came off a T from the pressure line) and imagine that this was an extra escape of pressure, not letting full pressure get to the tank. I did have problems at half throttle on the ground - idle was fine, and full throttle sounded fine, but between the two not so much.

I am going to learn to fly this plane so well it will become an art form. I will leave it set up as-is, and ask my instructors for any tips or guidance on how to fly the plane properly. Those who see me fly do not think I am unreasonable in my plane selection. I lack tons of experience, but I do have some kind of an understanding of how these things work. I totally understand what happened to the Decathlon and what made it crash (lack of airspeed over the wings at the top of an immelmann, trying to roll and increasing the AOA, forcing a stall, and trying to use ailerons instead of rudder to correct this only made matters worse by creating more drag on the stalled surfaces, where rudder use could actually have created more lift over the wings. I have definitely been jumping into things fast, and have not slowed down enough to think about what is going on. This last crash made me do just that.

Graybeard, not sure what my degree has to do with any of this - so what if I want to be a mechanical engineer, and maybe go into aerospace - doesn't mean that I don't get excited and make mistakes about related things; I am just starting out in that, too.

So again, thank you. I won't be putting a larger engine in this bird, I will learn to fly the wing, as you suggested.