Hayes tank on profiles

[Leester]

When mounting a Hayes 3oz tank on a profile does the bottum go against the fusalage or does it go upright??

[bill marvel]

When mounting a Hayes 3oz tank on a profile does the bottum go against the fusalage or does it go upright??

Most people I know recommend fitting the Kraft tank onto a profile with the bottom (with the lip) down.  I have one on a Use-To_Be ARF FliteStreak (Everything but the inboard wing has been rebuilt).  My FP .20 is not the least bit fussy about the tank heighth but I tried to locate the fuel feed outlet even or slightly above the needle valve.  It is a good clunk tank.
Regards,
Bill

[Glen Wearden]

I've got a Hayes tank on my Flite Streak with a Fox 25.  It is mounted with the bottom down.  Otherwise, the vent nipple wouldn't vent, since I'm not using muffler pressure.  It seems to work well.  The Hayes is really easy to set up.   Glen

[Steve Holt]

I've been using a Hayes 3 oz tank on my Flite Streak.  At first I could not get a good run - the engine leaned out to a runaway after a lap or so no matter how rich I set it on the ground.  The tank was vented to atmosphere and the engine was an FP25.  The tank was mounted with the "foot" against the fuselage.  To keep the engine run time down to about 7 minutes, I was short tanking - only about 2 oz.

After much trouble shooting with no improvement, I realized that with the short tank, on the ground the vent port was uncovered so it acted like a conventionally vented tank.  In flight, the fuel was thrown outboard, covering the vent, thus becoming a uniflow.  I tested this theory by filling the tank so that the vent was covered on the ground as well as in flight.  Nice consistant runs of almost 9 minutes.

I now have the tank mounted with the foot down and muffler pressure to the top port on the tank.  Engine runs are consistent with only a little leaning out in flight.  Tank is centered on the venturi.
Steve