Hi All:

         Before I disassemble a new tank to attempt to diagnose what may be a tank problem. Perhaps somebody can offer a solution.
 
         I put a new chicken hopper Uniflow tank on my Tudor that was powered by an OS .35 Stunt.   Notice the use of the past tense in describing the Tudor.  We could bot get a good needle valve setting for a consistent engine run.  The engine did not respond well to the changes of the needle.  At first there were many bubbles in the fuel line but this was alleviated by using muffler pressure on the tank.  Still failed to get a steady run.  The engine quit in the most unfortunate place and speared into the ground.

          What tests may I do prior to unsoldering the tank to see what is wrong?  This tank is the only change that made since the last flight.  I went to a smaller chicken hopper due to a severe over run. The tank was purchased from a popular CL supplier.

            Comments/Suggestions

                                                                                        Have a Cool Yule and a Frantic First,


                                                                                        Frank McCune
 

Frank,

To address your question, you can try drawing fuel out of the tank with a syringe, rotating the tank to various positions to try to ascertain where the pickups are really located.  You would do this at various fill levels.

A whole different idea is to go back to the good tank, but deal with the overrun by only filling it to the amount you really need for your stunt run.

Sorry about the spearing,

Peter