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Topic ClosedHave you weighed your 180?
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Colt View Drop Down
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Joined: 16 Nov 2019
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Posts: 383 		Direct Link To This Post Topic: Have you weighed your 180?
    Posted: 31 May 2020 at 6:07pm
Finished my Spreadsheet for Wt and Bal.  I'll upload it if I can figure out how.  PM me and I'll e-mail you a copy.  This is messy, but you can see it.  

Weight and Balance – 2016 R-Pod 180








*Basic Weight 3122 Lbs
Tongue Wt 442 Lbs








Item
Weight
Moment Arm
Moment








# Basic Moment = 442 * 13.4 = 5923 Ft-lbs








*Batt/Rack (47 lb) =
* 10.3 = 0








*LP Tank (38 Lb) =
* 10.7 = 0








*Water Htr (50 Lb) =
* 8.7 = 0








Fresh Water (30g/250lb) =
* 5.6 = 0








Gray Water (30g/250lb) =
* -1.9 = 0








Black Water (30g/250lb) = 250 * -5.5 = -1375








Wardrobe =
* -4.5 = 0








Rt Storage Cabs (Ctr) =
* 1.4 = 0








Fridge =
* 3.3 = 0








Shower =
* -3.3 = 0








Rear Wall =
* -7.0 = 0








Center of Bed =
* 7.6 = 0








? =
*
= 0
















Total Weight = 3372
Total Moment = 4548 Ft-lbs








Tongue Weight = Total Moment / 13.4 = 339 Lbs








NB: All weight in pounds, all dimensions in feet.






* Included in Basic Weight & Moment






# Center of wheel 0.6 feet behind “axle”/Suspension mount















John
'16 R-Pod 180
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Posts: 383 		Direct Link To This Post Posted: 31 May 2020 at 2:38pm
All of the design competitions are first rate and demanding.  The kids are expected to do a professional engineering design and a sales presentation.  The teams are scored on how well they designed the car and understand it.  then the car's performance is tested. Tenn Tech's course is brutal and looks designed to break the cars (it does).  There was only Baja 40 years ago.  I would choose Formula SAE, now. 
John
'16 R-Pod 180
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Posts: 5290 		Direct Link To This Post Posted: 31 May 2020 at 7:42am
I did a W&B spreadsheet for my 179 a couple years ago, using the wheel hub datum as well. Did a weighing with a baseline load out including dual batteries and full fresh water tank. I almost always boondock. I was surprised by the tongue weight and also by the total weight. Never could work my way back to FR's numbers so I am assuming they are bogus. I suggest that everyone weigh their trailer at least once. 

I wound up with a tongue weight of 14% outbound (FWT full, gray empty) and 11% inbound (gray tank full, FWT empty). I'm happy with that. Trailer weight is around 3650 and doesn't change much. I use a wdh which adds about 90 lbs to the trailer axle, putting it at about 3350 inbound.  I installed axle reinforcement and bumped up to 15 inch LRD tires and 2450 lb rated wheels. 

The SAE Baja competition looks cool. Didn't know SAE had an aero design competition too. 
1994 Chinook Concourse
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Posts: 383 		Direct Link To This Post Posted: 30 May 2020 at 10:50pm
Yeah, I liked the Kitfoxes I saw. Guy had one at 3M3 years ago, but I was too long legged to get in it.

I measured for a W&B sheet for my 180 this PM. Referenced everything to the wheel centerline so I'd get negative moments for stuff in the rear. Used a surveyor's tape. Measured to several places like the wardrobe and shower where I might stash things for a trip. It was worth the effort just for the comfort more data brings.

tcj, you have a mistake. The distance from the wheels to the hitch is 13.4'. 😉🤣

Now back to preping for the SAE Baja judging!
John
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Posts: 141 		Direct Link To This Post Posted: 30 May 2020 at 11:46am
Originally posted by offgrid


What do you fly? I had a Grumman Tiger and a Bonanza V tail but I’ve just done occasional renting for the past 10 years. It got to be too much money to justify ownership anymore for me.

I owned a 1/3 share in a Piper Cherokee 180.  I learned to fly in it.  Then built a kitfox and flew it for 7 years.  Then there came the day when it was time to quit.  It was three years ago.  I got old and was not as sharp as I should be.  I sold the kitfox to a retired FAA inspector and commercial pilot from Alaska.  I miss it a lot.Cry  But I am lucky to have lots of interests so bought an R-pod.Smile
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Posts: 2630 		Direct Link To This Post Posted: 30 May 2020 at 11:29am
Yeah. Meat has not been in short supply, but recently we have considered a second mortgage for a decent ribeye.
bp
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Posts: 2587 		Direct Link To This Post Posted: 30 May 2020 at 11:19am
The only time they hung folks for poaching wild horses out west was when they didn't get invited to the barbecue party.  Same for Bambi and Thumper.  Rabbit is a little dry for the grill, though; better stewed.  

Some of my poor itinerant Irish potato farmer ancestors got into a little trouble for poaching on the absentee English landlord's estate.  Hanging or transportation were the usual punishments, but it was the only way to get a little meat to go with the praties.  https://www.youtube.com/watch?v=1sTZ6sROY38

Carrying a poached [not like poached eggs] horse in your Pod, can really mess up the weight and balance, so plan on hunting early in your boondocking trip, so you don't have a lot to take home.  
Never leave footprints behind.
Fred & Maria Kearney
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Posts: 5290 		Direct Link To This Post Posted: 30 May 2020 at 11:08am
Poaching horses doesn't sounds very civilized to me. Didn't they use to hang folks out in the Wild West for that? And if the hangin' judge warn't around them parts, that never stopped the posse 'neither....
1994 Chinook Concourse
1995 RV6A Experimental Aircraft
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Posts: 2587 		Direct Link To This Post Posted: 30 May 2020 at 10:17am
One of the first things I learned in my first year in law school was to get a good freezer and stock it with dead animals for grilling/sacrifices.  But, as insurance, especially in those uncivilized places where you are frequently losing power, it helps to have a generator handy just in case.  We stocked up on Costco apple smoked bacon late last year in anticipation of blt sandwiches and stuffed bacon potatoes.  

Only the goddess of electronic aparatus will lower herself to accept lesser sacrifices.  .... Grade A eggs.

OG, out in the civilized part of the country, we have local meat suppliers and even Costco has a great selection, but it's getting a little pricey for my Social Security budget.  But, worst comes to worst, I can sneak off and poach a horse from our local wild herds or from Elon Musk's Tesla estate.
Never leave footprints behind.
Fred & Maria Kearney
Sonoma 167RB
Our Pod 172
2019 Ford F-150 4x4 2.7 EcoBoost
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Posts: 5290 		Direct Link To This Post Posted: 30 May 2020 at 10:14am
It would be the wheel hubs. The torsion arms can be considered to be rigid from the point of view of weight and balance.

The fore and aft cg limits at 15 and 10% are pretty straightforward, as are the top and bottom of the envelope at the max and empty weights. The sloping line representing the tow vehicle hitch weight is the one to noodle on a bit but I think that is correct.

What do you fly? I had a Grumman Tiger and a Bonanza V tail but I’ve just done occasional renting for the past 10 years. It got to be too much money to justify ownership anymore for me.
1994 Chinook Concourse
1995 RV6A Experimental Aircraft
2015 Rpod 179 - sold
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