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Engine basics => Engine set up tips => Topic started by: Allen Eshleman on February 02, 2012, 08:01:09 PM

Title: Brodak wide wedge uniflo setup
Post by: Allen Eshleman on February 02, 2012, 08:01:09 PM

Hi,

      I'm about to install two Brodak wide wedge, uniflow, tubes forward tanks, one in a kitted Smoothie and the other in a Top Flight Nobler.  I have a question.  Is there any preference as to where to have the fill tube and the overflow tube exit the fuselage.  Some setups I've considered are:

Fill tube out the top - and overflow tube out the bottom.   Or:

The fill tube out the top and overflow tube out the side.    Or:

The fill tube out the side and the overflow tube out the bottom.

I understand that the overflow tube must be capped during flight.

What kind of setups have you found that really work well.

By the way, I'm jettisoning two magnum style tanks. One already broke on the inside of the tank.  The other one is still intact.

Thanks in advance for your suggestions.

Title: Re: Brodak wide wedge uniflo setup
Post by: Clint Ormosen on February 02, 2012, 09:56:46 PM

In my opinion, the fill/uniflow tube sticking out the top usually looks kinda dumb. I put on the inboard side of the fuse near the needle valve. I have put it (by mistake) on the outboard side and it seemed to work fine. The overflow goes out the bottom somewhere you can get to it to cap/uncap it.
If you really want to hide it, the uniflow vent can go inside the cowl somewhere as long as it's still in the airflow. Kind of a pain in the butt to fill the tank that way, though.

Title: Re: Brodak wide wedge uniflo setup
Post by: EddyR on February 03, 2012, 06:16:32 AM

The standard setup that most contest flyers seem to use is on the outside of the body but on the inside of the circle above the tank.Connect on inside with a piece of fuel tubing. Over flow exit bottom and cap during flight.The copper tubing on the out side of the body can be short,3/8" long.In this picture you can see the vent above the muffler.
Ed

Title: Re: Brodak wide wedge uniflo setup
Post by: Allen Eshleman on February 03, 2012, 08:25:50 PM

Thanks Clint and Ed,

        That makes perfect sense to me and doesn't seem very hard to do.  Thanks so much.

Title: Re: Brodak wide wedge uniflo setup
Post by: Bill Little on February 06, 2012, 09:43:16 AM

Hi Allen,

Ed's picture shows it well.  Find a piece of weed eater line that fits inside the 1/8" OD copper tube and use it inside the copper tube once you heat it to make the bends.  The tubing will not kink then.

Also, solder a washer to the tube to glue to the inside of the fuselage.

BIG Bear
RNMM/AMM

Title: Re: Brodak wide wedge uniflo setup
Post by: Allen Eshleman on February 06, 2012, 03:17:19 PM

Another great helping idea.

Thanks so much.