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Old 04-28-2013, 10:23 PM   #21 (permalink)
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Got my adjustable trailer hitch yesterday...just over $90 shipped.

I ended up tucking the Gurney flap so it's not active. I can easily flip it back over when I want to.

Two trips up and back without a trailer has been netting me between 23.5/25.1 from Houston to College Station and between 26.5/24.2 coming back. Standard tool and overnight bag loads in the bed.

I probably won't have the chance to scale it with the trailer so it will basically be off the cuff on estimations.

I did notice that when I had the hatch up to divert the air over the trailer, the airflow was pulling stuff into the bed. I actually saw a sheet of paper in the road and ran over it. It ended up flowing under the truck and into the bed. It was someone's shipping receipt. I might end up lowering the extended rear diffuser a little lower so the air flows under the trailer more instead up into it.

I do make it a point to carefully inspect the trailers on site and before I git on the road. I've read many stories about how many U-haul trailers fail and I don't plan nor want to be part of that statistic.

I might be tempted to throw the fiberglass camper top on fer just one run up and back with a trailer and see what I git. Depends on how much time I'll have to make that attempt. It's been a long time since I've had it on the truck...

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Old 05-19-2013, 07:23 PM   #22 (permalink)
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Made a early morning run to College Station and back. Propped up the hatch and activated the Gurney flap to kick the air up over the 6'x12' trailer. Trailer was loaded this time (lots of heavy boxes) with a little more weight (estimated) than before (furniture).

Indicated mileage was 17.0mpg going up and 13.2mpg coming back. I think there was a little bit of a headwind on the return trip in the afternoon.

I was thinking that I should've measured the height of the hatch when the trailer/truck was loaded and unloaded. Not sure if the increased angle of the hatch (truck/trailer unloaded) should've been matched to when the truck/trailer was loaded. Looks like the mileage is gonna be a wash.
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Old 05-26-2013, 10:35 PM   #23 (permalink)
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Got a 5x8 trailer today and made a run up and back. The hatch was configured to the same height as the 4x8 trailer and the Gurney flap was active going up. Indicated mileage going up was 19.1. Coming back empty, I deactivated the Gurney flap and got 18.1mpg. The height of the hatch from ground was 68" loaded and 69" unloaded.

Speed was steady at 60mph. Didn't have cruise control as the brake switch wasn't working correctly. Will have to fix that soon...I miss my cruise control.
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Old 05-28-2013, 12:59 AM   #24 (permalink)
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Wink

2nd run with the 5x8 trailer indicated 19.5mpg going up with the Gurney flap inactive, lower grill block in place, hatch at 67" (loaded) from the ground. Indicated mileage coming back was 16.7mpg with the Gurney flap inactive, lower grill block in place, hatch at 69" (unloaded).
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Old 06-09-2013, 03:48 PM   #25 (permalink)
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BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
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Last 3: 25.45 mpg (US)

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Wink

Piccie of the 5'x8' trailer setup. You can see the adjustable trailer hitch...it was set down to a 4.5" drop.



Won't be able to test any runs with the fiberglass camper top...sold it last weekend. It was sad to see it go...but it had to go.

I still have at least 2 more trailer runs.

I'm almost tempted to make a run without the aero cap on...
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Old 06-09-2013, 10:29 PM   #26 (permalink)
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BZP, you might play with tire loadings over removing the aero topper.

This is to combined rig mechanical baseline. Using numbers to assess performance.

In a link originally provided by CapriRacer the function of this:

RMA Tire Guide, Chapter Four: Weighing RV's

is to see both side-to-side as well as front-to-rear discrepancies of the vehicles.

The trailer, even when best loaded, will place a load on the RA (rear axle) and the method by which one loads that trailer will reveal differences.

As the roll center on a U-Haul trailer is pushed to the walls via keeping the leaf springs underneath such (why the wheelwells are completely outside the shell; not just for easier loading), this is a stable platform for a trailer.

And you are familiar with your vehicles performance.

The point to "seeing" loads on tires/wheels is to counteract (via loading) the rise of the SA (steer axle). But keeping the trailers tongue weight from 10-15% of trailer axle weight in so doing. 12.5% as a default.

Measure Trailer Tongue Weight

To reduce steering inputs per 100-miles of operation (is the FE take-away) of all this.

To make truck tire pressures ideal (no more than a 3-5% pressure rise after 1.5-hrs steady-state driving); the truck tire pressures being within the vehicle manufacturer table; load versus pressure being an ideal worth finding as to not only steering, but braking for both vehicles (trailer pressure is always sidewall maximum without exception) is maximized.

Trailer towing doubles the per-mile risk of a loss-of-control accident. Skill is the cited defense of the moron. Risk management is the approach of the professional.

The CAT Scale Locator is your friend.

If you wish to use numbers to verfiy/quantify how things are from behind the wheel.




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Old 06-09-2013, 10:47 PM   #27 (permalink)
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What i have gained via your work is this. My Econoline will get 19 mpg stock and 13-15 pulling a 4 wheeled 6x12' trailer loaded with farm equipment.

When comparing your unloaded mileage to my unloaded mileage you are getting 30 some percent better but once loaded they are nearly identical. I am thinking that mechanical efficiency or lack of it plays the main difference.
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Old 06-20-2013, 04:20 AM   #28 (permalink)
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How about a non-aerodynamic vehicle towing an aerodynamic vehicle?
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Old 06-21-2013, 01:10 AM   #29 (permalink)
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I saw in Hucho's book, that a Sedan had some nominal Cd number, and a SUV type vehicle had a higher Cd. But when both were paired with a trailer with a large leading front end, the SUV-Trailer had a lower combined Cd than the Sedan-Trailer. Naturally, the less of a gap that was left, the better. I'll see if I can find the graphic I am thinking about and post it for you.
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Old 06-22-2013, 02:24 PM   #30 (permalink)
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graphic

Quote:
Originally Posted by wyatt View Post
I saw in Hucho's book, that a Sedan had some nominal Cd number, and a SUV type vehicle had a higher Cd. But when both were paired with a trailer with a large leading front end, the SUV-Trailer had a lower combined Cd than the Sedan-Trailer. Naturally, the less of a gap that was left, the better. I'll see if I can find the graphic I am thinking about and post it for you.
It should be at the full-boat-tail-trailer thread,maybe around page 25.

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