Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Potential mpg loss % with custom aero trailer.

Gschuld · 08-20-2021, 09:57 PM

Aerohead: good reality check

Euromodder: yes 4cyl ECO mode from a 475hp 6.2 v8 is still a good bit of power. Just calling it “ECO mode “ makes me giggle a bit

And the most compact version of my designs call for a 9’3” (290 cm) distance between hitch ball and trailer axle. That’s reasonably short for a 2700lb (1225kg) all up trailer running at 75mph (120 kph)

Given the choice I would trade a little aerodynamic efficiency for a very stable high speed behavior. Cross winds, in my experience, are one situation where an otherwise well balanced trailer can start to push the TV around.

Granted this situation is for a 2700lb trailer being towed behind a 5200lb SUV with a tow mode that includes real time all 4 corner torque vectoring(or whatever they call it) and with the trailer lower (just slightly) than the rear of the TV. The trailer would have a pretty low ground clearance and center of gravity. All things that help stability.

The less ideal situation is the relatively short ball to axle length. It may be just fine. I’m used to towing 24ft and 28ft trailers around on the highway, so maybe I’m just used to longer trailers. I have a 26ft trailer for a super lightweight racing 28ft sailboat (melges E-scow), with a mere 70” width to the outside of the single axle tires. That thing is only 1800lbs all up. But I’ve never towed anything that followed so smoothly that you can hardly tell it was back there on the highway.

That one has a 16ft ball to trailer axle distance.

08-20-2021, 09:57 PM	#98 (permalink)
Gschuld EcoModding Lurker Join Date: Jul 2021 Location: Beachwood NJ Posts: 39 Thanks: 4 Thanked 22 Times in 21 Posts	Aerohead: good reality check Euromodder: yes 4cyl ECO mode from a 475hp 6.2 v8 is still a good bit of power. Just calling it “ECO mode “ makes me giggle a bit And the most compact version of my designs call for a 9’3” (290 cm) distance between hitch ball and trailer axle. That’s reasonably short for a 2700lb (1225kg) all up trailer running at 75mph (120 kph) Given the choice I would trade a little aerodynamic efficiency for a very stable high speed behavior. Cross winds, in my experience, are one situation where an otherwise well balanced trailer can start to push the TV around. Granted this situation is for a 2700lb trailer being towed behind a 5200lb SUV with a tow mode that includes real time all 4 corner torque vectoring(or whatever they call it) and with the trailer lower (just slightly) than the rear of the TV. The trailer would have a pretty low ground clearance and center of gravity. All things that help stability. The less ideal situation is the relatively short ball to axle length. It may be just fine. I’m used to towing 24ft and 28ft trailers around on the highway, so maybe I’m just used to longer trailers. I have a 26ft trailer for a super lightweight racing 28ft sailboat (melges E-scow), with a mere 70” width to the outside of the single axle tires. That thing is only 1800lbs all up. But I’ve never towed anything that followed so smoothly that you can hardly tell it was back there on the highway. That one has a 16ft ball to trailer axle distance. Last edited by Gschuld; 08-20-2021 at 10:15 PM..