21 July 2013

Wings: Fuel tanks. Match drilled, countersunk and low level fuel sensor.

I decided to redo my fuel tanks.  See here for why.  The entries specific to the redone tanks are here.

Work on the tanks continue.  With the leading edges 95% done, I have more space to work on the tanks.  Here are the cap flanges after countersinking them to fit the skin dimples.  I plan to get locking caps.

Tank skins after matching drilling the J-stiffener and now ready for countersinking along the baffle holes.  About 336 holes in fact.  Match drilled, deburred, straightened, dimpled and fluted tank ribs visible, as are my in-progress capacitive probe plates.


And, the original crates are starting to look empty.

Okay, so the flap and aileron ribs and other smaller associated parts are elsewhere, but seems a far cry from the first day with the full crates and all the hardware.

Today marks the 250 hour mark.  I will take a guess that I'm looking at 200 hours to go.  We'll see how this prediction holds up.  Update 10-May-18:  Bad prediction. The wings required 611 hours.

Also, I liked the idea of a redundant low fuel level warning light.  Aircraft Extras has a nice setup, however I could make my own, with the features I want for less, using the same liquid level sensor.  After some digging around, I determined that the Honeywell LLE102000 is similar to sensor used with Gopher Electronics having it for the lowest price.  I picked up two and will also grab two anti-rotation plates for the install.  The sensor is just a simple TTL-type.  Just need to ensure a regulated supply which is easy enough.  I'll be able to integrate the input into a simple microcontroller setup that I plan to have doing various things.

The bottom of the 26-Jul-13 post shows the install of the sensor.

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