Dipstick for 172RG Cutlass

Discussion in 'Technical Corner' started by Nathan N, Nov 22, 2018.

  1. Nathan N

    Nathan N Filing Flight Plan

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    I can’t find a dipstick for a 172RG Cutlass for the life of me. I don’t want to create one unless I really need to.

    Does anyone happen to know where I could purchase one online?

    Thanks!
     
  2. Ravioli

    Ravioli Final Approach

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    Shouldn't one of these work? I'd be surprised the gear changes the fuel tanks. [But I've been wrong before]

    https://www.aircraftspruce.com/catalog/pspages/cessnafuelstik.php

    You said you don't want to roll your own, but a highly calibrated wooden dowel is unlikely to crack or blow a seal. Losing them is no biggie since you already have some leftover dowel and the measurements.

    I'll have to post a picture of my highly calibrated fuel stick. It's a ruler, and it broke, but not in the measurement area so it still works.

    [Note to Ravioli -- buy some doweling]
     
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  3. Nathan N

    Nathan N Filing Flight Plan

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    My favorite pasta,

    Thanks for your reply.

    I don’t know, will it? Would any dip stick measuring above 33 gallons work successfully? My tank’s compacicity is 66 gallons.
     
  4. Ravioli

    Ravioli Final Approach

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    Really? You have a 172 with 132 gallon fuel compacicity? *there are 2 tanks you know*

    So with an extra 462# of fuel, how does that thing fly?

    I think a dip stick is the last of your issues.
     
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  5. Nathan N

    Nathan N Filing Flight Plan

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    Hah! If only :)

    For everything combined, pal!

    Happy thanksgiving!
     
  6. Ravioli

    Ravioli Final Approach

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    Serious answer: Ask your A&P which you should use. They'll know the closest match to the tanks in your 172. There are variations in tanks between models. Some have more or less sump points, and where the fuel cap is can have different distances.

    Rolling your own is actually best so you know it's accurate. It just takes a while.

    Drain the tank
    Fill to known max (I think you said 33)
    Mark the stick
    Drain 8 - mark the stick at 25 (112# under full fuel is good from many flights)
    The drain in 5 gals and mark it till your down to unusable fuel.

    It's worth the time.
     
  7. Nathan N

    Nathan N Filing Flight Plan

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    I think that’s may be my only option...

    Thanks for taking the time to post... I’ll give it a whirl!

    Do you have a photo of yours?
     
  8. AggieMike88

    AggieMike88 Touchdown! Greaser!

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  9. hindsight2020

    hindsight2020 En-Route

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    I wonder how they come to the decision as to what model tank to market their fuel sticks. Frankly I'd pay a vendor for their time in coming up with the markings, or provide the equivalent values on a universal pipette. Defueling a 40 gallon leaded fuel tank in 1 gallon increments? Ain't nobody got time for dat. It would be a good double integration problem to figure out the height of the liquid. I tossed my copy of MatLab a long time ago. lol
     
  10. Ravioli

    Ravioli Final Approach

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    He's looking for his Cutlass. Totally different issue.

    The time expended is worth it. Did it for a [not a cutlass] when new fuel gauge(s) was installed. (single gauge shows both tanks and both were measured down)
     
  11. Nathan N

    Nathan N Filing Flight Plan

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  12. AggieMike88

    AggieMike88 Touchdown! Greaser!

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    They can do one that is specific to your aircraft....
     
  13. Skyrys62

    Skyrys62 Pattern Altitude

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    It's probably definitely worth it.
    One of the 172 rentals I fly has a stick, and it is totally off, by like 5 gallons.
    The others don't even have them.
    Funny enough, the Cutlass that I rent does. (no I'm not stealing it for you) ;)
     
    Last edited: Nov 23, 2018
  14. aftCG

    aftCG Pre-takeoff checklist

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    Man you work way too hard for a dipstick. Lazy man's version (works for any aircraft):
    Begin with random amount of fuel in tank. Dip a new paint stirring stick. Make a mark with a sharpie pen. Fill tank.
    Subtract: tank capacity - amount of gas you just pumped = amount that was in the tank. Write that number next to the mark you made.

    Make a point of doing that with various amounts of fuel showing on the gauge. After 5-6 flights you'll have a very accurate dipstick. It's even quicker on planes that don't have a "both" position (or have lousy cross feed) since you'll collect two data points every stop.
     
  15. Nathan N

    Nathan N Filing Flight Plan

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    I’d like to work the least and just purchase one, hehe. But it seems this is my only option.

    Good idea! Thanks
     
  16. Nathan N

    Nathan N Filing Flight Plan

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    Everyone has a price :D Just blame it on the previous renter!
     
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  17. dmspilot

    dmspilot En-Route

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    Is it really necessary? The 172RG has a tab (filler neck) allowing an accurate partial fuel load.
     
  18. alfadog

    alfadog En-Route

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    1. Lay fuel stick next to tape measure with markings on both showing.
    2. Take Picture.
    3. Post pic here.
    4. Mark universal stick accordingly.
    5. PROFIT!!
     
  19. Ghery

    Ghery Final Approach

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    With our club rules requiring that you fill the tanks if you flew more than an hour, it's easy. Look in the filler openings with the caps removed. If full, fly. If not, get it filled and then fly. The 172N with long range tanks has about 6 hours of fuel on board with full tanks. After 3 hours I need to visit the little boy's room, so I gas up again and go fly some more. :p
     
  20. Greg Bockelman

    Greg Bockelman Administrator Management Council Member

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    You lose some utility that way if you need payload. If the tanks are full...
     
  21. wilkersk

    wilkersk Cleared for Takeoff

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    I totally thought this was about the oil dipstick.

    The R/S models are a little tricky to dip the fuel tanks. Besides the fact that dip sticks calibrated for earlier models are not compatible, you have to position the stick behind the extra rib in those tanks. If you don't the reading will be way off. Its also pretty easy to drop the dang thang in the tank if you're not careful.
     
    Last edited: Nov 25, 2018
  22. Skyrys62

    Skyrys62 Pattern Altitude

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    Another reason a wooden dowel might be nice, as they float?
     
  23. Stewartb

    Stewartb Final Approach

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    Drain usable fuel in your normal parked attitude. Get a paint stir stick from Lowe's. Add 5 gallons, mark the stick. Do the same on the other side to verify they're the same ( they have been with my own planes), then repeat as many times at as many increments as you wish. I've got sticks for small tires, big tires, and floats. Made for my planes on the gear they're using. My fuel stick is so accurate I can set my FS-450 by it. It's my most trusted fuel gauge.
     
  24. Ghery

    Ghery Final Approach

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    True enough. The rule is there so that a member doesn't come to the hangar expecting to fly and finds the tanks way low and has to "waste" time going to the FBO to fill up first. Fortunately, this hasn't been an issue (payload) in the 18 years I've been a member of the club.
     
  25. ktup-flyer

    ktup-flyer Pattern Altitude

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    drill a little hole in it and tie a cord on. Throw it around your wrist before you check your tanks
     
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  26. benyflyguy

    benyflyguy Line Up and Wait

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    upload_2018-12-2_20-5-13.gif
     
  27. Wpons

    Wpons Filing Flight Plan

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    I purchased a universal fuel stick.
    Come with a table that you fill.
    Works great on my 1980 172rg. If you need a copy of the table i can email to you.
     
  28. Nathan N

    Nathan N Filing Flight Plan

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  29. AggieMike88

    AggieMike88 Touchdown! Greaser!

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    Fuelstick.com?
     
  30. Nathan N

    Nathan N Filing Flight Plan

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    The table is specific to a cutlass 172RG, yea?
     
  31. Wpons

    Wpons Filing Flight Plan

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    12" 30
    11" 27 1/2
    10" 25
    9" 22 1/2
    8" 20
    7" 17 1/2
    6" 15
    5" 12 1/2
    4" 10
    3" 7 1/2
    2" 5
    1" 2 1/2

    Note.: This was done on my airplane 172RG , 1980, I cannot ensure it will be the same on yours.
    on mine it was done from complete empty tanks and filled by the gallon.
    Hope it help you build you own.
     
  32. Nathan N

    Nathan N Filing Flight Plan

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    Are you sure this is correct?

    I don't think our tank is 12" deep.

    Even a cantilevered wing like the 210 and cardinal are only about 10”. A strutted wing is not as thick so it should only be 8 inches or so.

    Thank you!
     
  33. Wpons

    Wpons Filing Flight Plan

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    Using the universal fuel stick, is dead on.
    Maybe is not inches on the fuel stick and it should be treated as units.
    Tomorow ill visit the airport and will verify for you.