ORIGINAL: ThunderBoat42
THanks for the reply. The foam 'wetted area' is something I can see helping. The Tetra tank has a bladder and a fill vent to extract air while filling. It is pluged in flight. There is a seperate pressure line that puts the pressure between the tank and bladder. May pull one from the parts drawer and see how it will work with this on the stand.
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I am guessing from what you have posted that it is the glow version not the cdi. If it is the cdi then use the ignition system that came with the engine. If it is the glow version, there is definitely no need to run an on board glow driver. If the engine is tuned properly it will idle forever (inverted), and not die when throttling up.
All YS's from the 140DZ onwards are pumped, therefore no need to pressurize anything.
I have been using the Tettra bubbless tank for over ten years on the 140DZ, 160DZ, 170DZ cdi and the 175DZ cdi engines and never had a engine stop due to air in the fuel system. This is the most reliable fuel tank i have ever used. Set up the fuel tank exactly as the instructions show.
The nipple on the tank that vents to atmosphere is not a pressure fitting. As the engine is pumped, the pump will draw the fuel out of the tank without any pressure required. This vent must not be plugged. It allows the bladder to collapse as the fuel is drawn out. If it is plugged it will create a vaccuum as the pump tries to draw the fuel out starving the engine of fuel. It is a good idea to run fuel tube from this nipple to outside the fuselage (through the floor), so if there is an internal leak anytime the fuel will not be soaking the inside of your model.
Most YS users have there own preferred fuel mix and i am no different. In glow engines i use 30% nitro, 19% Coolpower purple oil and 1% castor. In cdi engines i use 30% nitro, 8% Coolpower purple oil and 1% castor. I've never had any problems using these fuel mixes.
Once the needle and reg are set. RESIST THE URGE TO FIDDLE.