Round vs Squarish Eggs - Fiberglass RV


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Old 05-05-2011, 12:26 PM   #1
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Round vs Squarish Eggs

With e'body watching their MPG's, I was wondering if anybody has towed both a round egg and a squarer (is that a word??) egg and can report on the MPG differences? In particular I was thinking of the Scamp/Bolers compared to the Trilliums/Escapes. I'd think the squarer FG rigs would fare worse. So is there a difference between the 2 shapes and gas mileage? And if not, why not?
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Old 05-05-2011, 12:45 PM   #2
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We've towed a 15.5' Sunline that weighed about the same as our Scamp 16 and less than a Casita 16 we towed. We used the same tow vehicle for all three rigs. With the lighter, squarish Sunline we got 20 mpg; with the other tow we got 23 mpg.

The Sunline was a little wider at 7' compared to the others 6'8".

I would say based upon the mileage the roundies put less of a load on the tow vehicle.

Norm
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Old 05-05-2011, 12:53 PM   #3
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Round like a ball, square like a brick. Now you can hit the easy button.
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Old 05-05-2011, 01:28 PM   #4
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So if you want to maximize gas mileage go for the Scamps and their relatives.
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Old 05-05-2011, 01:53 PM   #5
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Quote:
Originally Posted by melissab View Post
With e'body watching their MPG's, I was wondering if anybody has towed both a round egg and a squarer (is that a word??) egg and can report on the MPG differences? In particular I was thinking of the Scamp/Bolers compared to the Trilliums/Escapes. I'd think the squarer FG rigs would fare worse. So is there a difference between the 2 shapes and gas mileage? And if not, why not?
I have owned and towed many shapes and sizes of eggs and there certainly is a difference in towability and mileage among them but it won't be you who makes the enemies when I tell you my results!!

Comparing 13's strictly on towing and mileage, I have found your assumption to be correct.
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Old 05-05-2011, 02:20 PM   #6
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LOL, thank you Floyd. I like how you put that,
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Old 05-05-2011, 03:42 PM   #7
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I have had each also from Trills,Fiberstream,Scamp & Casita.

All I know for sure is I have had more fun per gallon with each trip I take.
The tiny difference in mileage is not something I worry about.

I know the newer the trailer the easier it has pulled for me and that makes for more fun per gallon too.
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Old 05-05-2011, 04:04 PM   #8
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Certainly a few mpg can seem insignificant however we are undergoing almost unbelievable fuel inflation. In a little of two years the cost per gallon has almost tripled and I fear the end is not in sight.

It would be manageable if it was only gasoline, but everything is increasing with the cost of energy. Like many of the posts on this forum indicate, people are simply concerned, particularly as they reach retirement and endeavor to take that long RV trip.

The positive is that RV living of itself is inexpensive.

Norm
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Old 05-05-2011, 04:34 PM   #9
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I am currently towing a 21' Bigfoot after previously having a Scamp 16 and a Casita 17. I am down 5-6 miles per gallon with the Bigfoot. The flat frontal area on the Bigfoot is far less aerodynamic. I can feel it catching wind in conditions that didn't faze the Scamp and Casita. Of course, the Bigfoot is also bigger and heavier, so not really a fair comparison. We love the extra space and 4-season features, but it doesn't pull like a small egg.
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Old 05-05-2011, 05:53 PM   #10
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yup...we know there is a bit more drag towing our "squarish" outback...but we simply accept it. we tow with an acura 3.2 tl 6 cyl and average 20-21 mpg. we're content with that.
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Old 05-06-2011, 08:27 AM   #11
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We get about 3 less MPG with the Bigfoot versus the Scamp, of course the BF is 130% heavier, but as Dave comments the frontal area is a killer.
We lockout overdrive on the Ford 150 (4 speed auto) when using the BF.
Tony
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Old 05-06-2011, 02:45 PM   #12
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Many years ago I took a course in fluid mechanics (air is a fluid in the mind of an engineer). Two things I dimly remember about drag are that shape matters much less than frontal area, and that the shape of the back is as important as the shape of the front. None of these trailers have a tapered tail, so the sterns are creating a lot of drag.

Of course, I tow an Escape.
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Old 05-06-2011, 02:52 PM   #13
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Originally Posted by Ron Stewart View Post
Many years ago I took a course in fluid mechanics (air is a fluid in the mind of an engineer). Two things I dimly remember about drag are that shape matters much less than frontal area, and that the shape of the back is as important as the shape of the front. None of these trailers have a tapered tail, so the sterns are creating a lot of drag.

Of coure, I tow an Escape.
"none of these trailers has" nothing like a good education to trump experience!
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Old 05-06-2011, 03:27 PM   #14
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I teach math, not grammar.
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