plane problem

[4.2GUst]

i have one of those kit planes and it seems that when its on level ground it runs fine when its on a lean it seems to be starving for fuel all the tank is sealed and lines are new but i end up with air bubbles in line i have filled it up with air and no leaks
got me stuffed havent even got it in the air yet!!

[midnight]

Its got teh fuel outlet in the middle of th bottel doesnt it?


Hmmmmmmm

[4.2GUst]

yep it does but theres tubes going in to it theres 3 intotal one for the pipe on the exhaust one inlet and one outlet the inlet has been blocked off and i have also swapped them around same effect !! got me buggered

[midnight]

Maybe ask the local hobbyshop/ToyWorld?

[p38arover]

I used to fly model planes (for about 20 years) and race model boats so I have some experience.

You mention air bubbles in the fuel feed. There shouldn't be any. Does the fuel pickup tube inside the tank have a weight on the end of it?

Have you made sure it doesn't touch the back of the tank - it has to be able to move from side to side and up and down.

If it has a pick up tube with weight and it does clear the rear of the tank, it might have a split in the line which is allowing it to suck air. Silicone tubing will split very easily if there is a sharp edge at the end of the metal tube over which the silicone tubing is fitted.

Re the other two pipes (filler and overflow), usually they are bent at 45-90 degrees and one will face to the bottom of the tank and one to the top. If you don't use exhaust pressurisation, leave both tubes open. Only plug one of them if you are using exhaust pressurisation.

Don't forget that you don't lean the mixture out completely for max revs on the ground. When the model gets airborne it will lean out slightly so leave it a tad rich - experience will tell you by how much (not much help, I know, as you aren't yet in the air).

Ron

[4.2GUst]

yep theres a weight that is freely to move up and down
when the plains horizontal it ruld fine and no bubbles in the fuel line as soon as you go vertical it stalls and bubbles apear!

got me beat
too hot to play with it at the moment !!

[4.2GUst]

thanks for the help
i shortend the weight tube and now it seems fine!!

[p38arover]

thanks for the help
i shortend the weight tube and now it seems fine!!

Excellent!

Now take a break and go and visit the Birdwood National Motor Museum.


Ron

[4.2GUst]

yeah im there this weekend bloody rockn roll rondevou!!