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Author Topic:   Wind resistance.
Arch Autenreith posted 08-06-2001 01:47 PM ET (US)   Profile for Arch Autenreith   Send Email to Arch Autenreith  
Here's something that probably won't be useful but thought someone might know the answer anyway. In towing the Montauk back and forth to florida a couple times (2300 miles 'round trip) I got to wondering how much the winshield in particular (and all the rods and nets) that are substantially higher than the roof of my car. The deck is about the same as the roof. Maybe a little lower. Can anyone make some sort of a guess or have calculations to determine how much of a savings there might be by removing the windshield for these longish trips? No laughing, now. I'm curios.
Arch
Arch Autenreith posted 08-06-2001 01:54 PM ET (US)     Profile for Arch Autenreith  Send Email to Arch Autenreith     
Let's try this again. Jimh, please delete the previous. tks.

Here's something that probably won't be useful but thought someone might know the answer anyway. In towing the Montauk back and forth to Florida a couple times (2300 miles 'round trip) I got to wondering how much wind resistance the windshield in particular and all the rods and nets (that are substantially higher than the roof of the car) add to gas mileage. The deck is about the same as the roof. Maybe a little lower. Can anyone make some sort of a guess or have calculations to determine how much of a savings there might be by removing the windshield for these longish trips? No laughing, now. I'm curios.
Arch

Bigshot posted 08-06-2001 02:27 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Don't know if there is a calculation for that but I would do it. A tailgate burns more gas so why not a windshield.
Dr T posted 08-07-2001 04:47 PM ET (US)     Profile for Dr T  Send Email to Dr T     
Bunch of different factors come into play. These include the aerodynamincs of the towing vehicle as well as that of the boat.

I have found that my pickup gets a little better mileage when the boat has a towing cover on it. Removing the windshield will make a smoother surface for the air to flow over, so should help the mileage.

whalerron posted 08-08-2001 08:35 AM ET (US)     Profile for whalerron  Send Email to whalerron     
As for tailgates, Consumer Reports ran a test with pickup trucks a few years back and they were testing the effect on fuel mileage of the tailgate up versus with the tailgate down. Their findings were surprising. All of the trucks (fullsize included) except for 1 model got 1 to 2 miles per gallon better mileage when running with the tailgate up. If I remember correctly, it was a Nissan or a Toyota that did better with the tailgate down. Their conclusion was that the manufacturers have taken the truck bed/tailgate into account in their airflow design for the trucks. One caveat is that this testing was done with empty truck beds.

As for the boat, if you have an easy method to get the windshield out of the airflow, you should do it. It can't be helping things and it may save you the headache of replacing the windshield when you finally encounter and errant rock or low flying bird. I have seen some guys put the windshields on hinges so they can be folded out of the way.

- ron

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