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Query re R44 fuel tanks


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#1 RisePilot

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Posted 15 September 2018 - 09:47

With the bladder tanks on the R44, full fuel is 46.5 US gallons, (which is technically 47.7gal gals total fuel with 46.5 gals being useable).

 

My query is if you ran an R44 until either the “low fuel” light came on (3gals remaining) or exhausted the fuel totally and “dipped” the tanks would those measurements show 3 gallons and 0 gallons respectively?



#2 RisePilot

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Posted 15 September 2018 - 09:51

To clarify "dipping" is measuring with a calibrated metal stick inserted in main tank (left side) vertically from the filler opening.



#3 r22butters

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Posted 15 September 2018 - 10:37

Well my money's on yes :)
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#4 ianunderdown

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Posted 15 September 2018 - 13:30

You shouldn't be dipping bladder tanks.  You might poke a hole in the bladder.



#5 octagon

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Posted 16 September 2018 - 13:11

Wouldn't you expect to see some additional unusable fuel in the tank?



#6 RisePilot

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Posted 17 September 2018 - 02:40

The details would inlcude the shape of the bottom of the main tank, location of fuel pickup line and location of the float/measurement device for the fuel gauges.

 

Also, curious if this is different for tanks that have been retrofitted with bladders as opposed to new production bladder tanks.



#7 Eric Hunt

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Posted 17 September 2018 - 05:53

There is also a large variation in results from using a dipstick. Does Robinson make an official one?

 

We made our own, and calibrated it from an empty tank and then added measured amounts and marked the stick as we went. Worked a charm, but operator technique gave differing results by a gallon or two.



#8 octagon

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Posted 17 September 2018 - 07:48

http://helicopterfor...r22-fuel-stick/



#9 RisePilot

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Posted 19 September 2018 - 11:41

Damn, I hope no one in the thread link above is in any way involved in engineering or maintenance.

 

The problem-solving skills - WTF?  rigging tubes, pipettes, wooden dowels with paint or sharpie marker writing on it and the “I’m going to accidentally drop it in the tank”.

 

How about a simple aluminium (yes spelled/pronounced in proper Queen’s English) bar approximately 5mm thick and 25mm wide with the increments “stamped” into the metal.  The top is either shaped into a “T” or “triangle” handle about 8cm wide.  You dip it into the tank up to the handle (it can’t fall in, is clean and always measures to the same point).

 

I don’t know where these come from, but nearly every R44 I’ve flown in Europe has one similar.  I’ve never seen the same in the US.


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#10 r22butters

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Posted 19 September 2018 - 13:19

Damn, I hope no one in the thread link above is in any way involved in engineering or maintenance.

 

The problem-solving skills - WTF?  rigging tubes, pipettes, wooden dowels with paint or sharpie marker writing on it and the “I’m going to accidentally drop it in the tank”.

 

How about a simple aluminium (yes spelled/pronounced in proper Queen’s English) bar approximately 5mm thick and 25mm wide with the increments “stamped” into the metal.  The top is either shaped into a “T” or “triangle” handle about 8cm wide.  You dip it into the tank up to the handle (it can’t fall in, is clean and always measures to the same point).

 

I don’t know where these come from, but nearly every R44 I’ve flown in Europe has one similar.  I’ve never seen the same in the US.

 

Allunimum!? (in the brutish Trump's English)

 

We can't afford that!  Remember now, we're helicopters pilots, not airline jocks! 


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#11 Aluminium Mallard

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Posted 23 September 2018 - 18:46

Damn, I hope no one in the thread link above is in any way involved in engineering or maintenance.

 

The problem-solving skills - WTF?  rigging tubes, pipettes, wooden dowels with paint or sharpie marker writing on it and the “I’m going to accidentally drop it in the tank”.

 

How about a simple aluminium (yes spelled/pronounced in proper Queen’s English) bar approximately 5mm thick and 25mm wide with the increments “stamped” into the metal.  The top is either shaped into a “T” or “triangle” handle about 8cm wide.  You dip it into the tank up to the handle (it can’t fall in, is clean and always measures to the same point).

 

I don’t know where these come from, but nearly every R44 I’ve flown in Europe has one similar.  I’ve never seen the same in the US.

We use wooden downs with the measurements engraved down here... they are specific to the machine. It's often 40 degrees in the shade so the danged avgas tends to evaporate faster than you can read it off one of those fancy alumooooninium ones!



#12 Eric Hunt

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Posted 25 September 2018 - 02:46

Ours also was a wooden dowel, with notches carved into it and ink markers for quantity - advantage of a round-ended dowel was that it couldn't damage the tank. And it had a big metal rod through the top, resting on the filler lip, to ensure consistent measurement, and to stop it dropping into the tank. Fitted neatly under the seat.






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