Grand Design

justme wrote:

Me Again wrote:
Hard corners front and/or back effect mileage. I went from a 8500-9000 lb 26 ft 5th wheel with square corners front back to a 12K+ 29' 5th wheel with front and rear caps and mileage improved.

Ever notice the long haul trailer with the aero rear panels that fold out.

https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf

So what is the aero dynamic drag for various end caps for 5th wheel. Your link does not validate your assertion for a 5th wheel trailer-

Nor does yours.... Having said that your position was to bash a camper without a cap based on your opinion of the looks.

Me Again wrote:
Hard corners front and/or back effect mileage. I went from a 8500-9000 lb 26 ft 5th wheel with square corners front back to a 12K+ 29' 5th wheel with front and rear caps and mileage improved.

Ever notice the long haul trailer with the aero rear panels that fold out.

https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf

So what is the aero dynamic drag for various end caps for 5th wheel. Your link does not validate your assertion for a 5th wheel trailer-

Me Again wrote:
Hard corners front and/or back effect mileage. I went from a 8500-9000 lb 26 ft 5th wheel with square corners front back to a 12K+ 29' 5th wheel with front and rear caps and mileage improved.

Ever notice the long haul trailer with the aero rear panels that fold out.

https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf

I think your reaching a bit to sell a rear cap or downplaying the campers that don't have one.... Don't you think!

Here's a quote from Page 11. It say's nothing about rounded rear corners.
A straight-side van trailer with rounded corners at the front offers the least resistance.

Having said that I haven't seen a rear cap that mimics what rear air loovers that added to the big rig trailers to that moves the negative air pressure away from the rear of the trailer.

Bottom line: The rear air cap on our campers is only to provide the cosmetic appearance that you prefer.

Hard corners front and/or back effect mileage. I went from a 8500-9000 lb 26 ft 5th wheel with square corners front back to a 12K+ 29' 5th wheel with front and rear caps and mileage improved.

Ever notice the long haul trailer with the aero rear panels that fold out.

https://cumminsengines.com/uploads/docs/cummins_secrets_of_better_fuel_economy.pdf

Me Again wrote:
Rear caps are 95% cosmetic and 5% better mileage if shaped correctly.

Can you supply a link to back up the better mileage claim?

Rear caps are 95% cosmetic and 5% better mileage if shaped correctly.

john&bet wrote:

goducks10 wrote:
I prefer the fiberglass rear cap simply for the elimination of another area that may delam.
Mine doesn't have it and it's always of a little concern. I have a large rear window, 3 clearances lights, 2 taillights to make sure are always caulked. Yes I would need to check a FG cap as well but having a slight leak won't be causing delam.
And IMO FG caps just look more upscale.

The rear cap on my '05 Montana started to surface crack at about the 8 year point. It only got worse over the next 4 years till we traded it for a GD. Why should the rear delam any sooner than the sides?

Don't sweat it... It won't

john&bet wrote:

goducks10 wrote:
I prefer the fiberglass rear cap simply for the elimination of another area that may delam.
Mine doesn't have it and it's always of a little concern. I have a large rear window, 3 clearances lights, 2 taillights to make sure are always caulked. Yes I would need to check a FG cap as well but having a slight leak won't be causing delam.
And IMO FG caps just look more upscale.

The rear cap on my '05 Montana started to surface crack at about the 8 year point. It only got worse over the next 4 years till we traded it for a GD. Why should the rear delam any sooner than the sides?

Never said it would. My point was that delam is potential problem with fiberglass RV's. If you can take way one potential problem then why not?

goducks10 wrote:
I prefer the fiberglass rear cap simply for the elimination of another area that may delam.
Mine doesn't have it and it's always of a little concern. I have a large rear window, 3 clearances lights, 2 taillights to make sure are always caulked. Yes I would need to check a FG cap as well but having a slight leak won't be causing delam.
And IMO FG caps just look more upscale.

The rear cap on my '05 Montana started to surface crack at about the 8 year point. It only got worse over the next 4 years till we traded it for a GD. Why should the rear delam any sooner than the sides?

I think a rear cap just makes the rear end better to look at. LOL