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Topic ClosedCaulking the 'spoiler'
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offgrid View Drop Down
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Posts: 5290 		Direct Link To This Post Topic: Caulking the 'spoiler'
    Posted: 21 Jul 2020 at 11:11am
Ok, I stand corrected on the tank locations, hard to keep track of all the different floorplans. I know that on my 179 the tongue weight changes by close to 3% when my 30 gallons of water makes its way from my fresh water tank to my gray tank. So I have my loading set up that I'm at 14% with the fresh tank full and 11% with they gray tank full. I mostly boondock but if you don't and dump before you leave camp you don't have that problem. 
1994 Chinook Concourse
1995 RV6A Experimental Aircraft
2015 Rpod 179 - sold
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lostagain View Drop Down
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Posts: 2587 		Direct Link To This Post Posted: 21 Jul 2020 at 12:50pm
Our 172 had the black and gray tanks aft of the axle and fresh forward.  It's something you have to keep in mind when practicing the Zen of trailer balancing.  Gallon containers of drinking water help serve as moveable ballast and can be easily refilled if need be.
Never leave footprints behind.
Fred & Maria Kearney
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Phil from Maine View Drop Down
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Posts: 19 		Direct Link To This Post Posted: 21 Jul 2020 at 1:16pm
Originally posted by lostagain

Our 172 had the black and gray tanks aft of the axle and fresh forward.  It's something you have to keep in mind when practicing the Zen of trailer balancing.  Gallon containers of drinking water help serve as moveable ballast and can be easily refilled if need be.


Hmmm..........what year R-172?
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lostagain View Drop Down
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Posts: 2587 		Direct Link To This Post Posted: 21 Jul 2020 at 1:28pm
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Never leave footprints behind.
Fred & Maria Kearney
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Our Pod 172
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Phil from Maine View Drop Down
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Posts: 19 		Direct Link To This Post Posted: 21 Jul 2020 at 2:02pm
 Intuitively, predicated on our discussion here, I would  think that having the black and gray forward would do more to balance the TT along the 60-40 ratio than having them in the back.
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marwayne View Drop Down
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Posts: 1002 		Direct Link To This Post Posted: 21 Jul 2020 at 2:52pm
We have a 2011 - 172 grey and black tank in front of axle
If you want something done right, do it yourself.
2011 RP172, 2016 Tundra 5.7 Litre, Ltd.


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offgrid View Drop Down
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Posts: 5290 		Direct Link To This Post Posted: 21 Jul 2020 at 2:53pm
OK, I feel better now, I thought I recalled the 172's having the tanks the other way. I wonder why they changed it? 

That's the problem: the intuitive approach doesn't really work.

Once you know the actual tongue weight under one loading condition, the math is pretty easy for any load you add or remove. Like this:

Change in tongue weight  is: 

added weight X distance from added weight to axle / distance from tongue to axle. 

Add to original tongue weight for load in front of the axle, subtract from tongue weight for load added behind the axle.  If you remove load subtract when in front of the axle, add for behind. 

30 gallons of water is 250 lbs. That's it. 
1994 Chinook Concourse
1995 RV6A Experimental Aircraft
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lostagain View Drop Down
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Posts: 2587 		Direct Link To This Post Posted: 21 Jul 2020 at 3:21pm
Looking at the photo reminds me where the tanks were.  Black and gray forward, fresh aft.  Sorry for the bad memory.  It's been almost a year since we sold our 172.  
Never leave footprints behind.
Fred & Maria Kearney
Sonoma 167RB
Our Pod 172
2019 Ford F-150 4x4 2.7 EcoBoost
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