Author Topic: Fuel Tank pick-up (Read 601 times)

ray copeland · « **on:** April 16, 2008, 07:10:25 PM »

Mounted a new 2 oz. clunk tank because i did not like the air bubbles from my hard tank and did not get good runs with it . Was doing the in hand testing thing like holding the plane and doing inverted and side to side and noticed if i went nose down there would be no fuel to pick up in the end of the tank. Am i missing something here or is the little time it takes to complete a wing over or some other stunts does the fuel flow just catch up or is there a little engine pause sometimes? Just can't get the correct thought "pattern" going here. Have never really pondered this while flying before. Muffler pressure on an OS 15. Thanks for any thoughts on this, Ray

Crist Rigotti · « **Reply #1 on:** April 16, 2008, 08:07:07 PM »

When flying the fuel will stay at the back of the tank. Bob Reeves has a cool video of a plastic clunk tank which clearly shows the fuel in a wing over. Bob, where is that video?

Bob Reeves · « **Reply #2 on:** April 18, 2008, 01:15:24 PM »

Might be better to right click the link and save target as...

EddyR · « **Reply #3 on:** April 20, 2008, 10:24:03 AM »

As the fuel is used up most of it stays at the outside the circle side of the tank. Big Jim use to build tanks with the uniflow at the front 1/3 of the tank on the outside wall and they never come out of the fuel until the last 6 laps.A friend and I did test 20 years ago with bottles on strings swung in a circle and the fluid stayed to the outside wall. Interesting in the video that the pickup is moving all over the place and the motor runs just like a metal tank with a fixed pickup. In the early 50's when many motors had poor suction and we were using junky tank they was a lot of motor burping and quiting many times followed by a crash

Ed

Author Topic: Fuel Tank pick-up (Read 601 times)

ray copeland

Fuel Tank pick-up

Crist Rigotti

Re: Fuel Tank pick-up

Bob Reeves

Re: Fuel Tank pick-up

EddyR

Re: Fuel Tank pick-up