Heavy load-bearing foamie

Canvas covered foamies (Thrifty Alternatives...)

Moderator: eaglesdare

Re: Heavy load-bearing foamie

Postby KennethW » Sat Sep 23, 2017 12:43 pm

Just a thought. Why not have the solar panels be the roof? :thinking:
KennethW
500 Club
 
Posts: 959
Images: 80
Joined: Wed Feb 20, 2013 8:01 pm

Re: Heavy load-bearing foamie

Postby John61CT » Sat Sep 23, 2017 5:43 pm

KennethW wrote:Just a thought. Why not have the solar panels be the roof? :thinking:
Not designed to be load bearing, need to be well supported, and panels aren't the only things up there.

Sealing issues.

Not insulating, and applying insulation directly would hurt both their efficiency and longevity.

But interesting thought experiment, maybe Musk's roof tiles 8-)
John61CT
The 300 Club
 
Posts: 417
Joined: Thu Nov 17, 2016 4:36 pm

Re: Heavy load-bearing foamie

Postby aggie79 » Mon Sep 25, 2017 8:49 am

John61CT wrote:Where I'm having more doubt is that we're not talking about static loading here, and there will be *very* large lateral and also lifting forces at play.


Agree!
Tom (& Linda)
For more on our Silver Beatle teardrop:
Build Thread

93503
User avatar
aggie79
Super Duper Lifetime Member
 
Posts: 4851
Images: 666
Joined: Tue Aug 07, 2007 5:42 pm
Location: Fort Worth, Texas
Top

Re: Heavy load-bearing foamie

Postby GPW » Tue Sep 26, 2017 6:25 am

John , you have a drawing or sketch of what you want to do exactly … or some solid clues ? If we had an idea of what you want to do , we’d be better able to come up with a few valid ideas … Apologies , I’m still confused … 8’X7’@500 PLUS pound up in the air .. is not much to go on … All I can think of now is a car carrier …
Attachments
carrier trailer .jpg
carrier trailer .jpg (210.64 KiB) Viewed 295 times
There’s no place like Foam !
User avatar
GPW
Silver Donating Member
 
Posts: 13276
Images: 543
Joined: Thu Feb 09, 2006 7:58 pm
Location: New Orleans
Top

Re: Heavy load-bearing foamie

Postby GPW » Tue Sep 26, 2017 6:40 am

Seriously , look how that’s made eh . Just your Basic utility trailer ( heavy duty) , with some real sturdy frame work over the top. Something like that, you could put whatever “walls" you want on that , strap whatever on the top , and you’re good to go .
Personally ( an “opinion” ) I’d find an old car carrier trailer like this for a good price , chop it to suit carrying what we want ( were not carrying cars anymore ) , and build the DELUXE cabin on the lower , maybe a patio/cabana on top? Whatever you want . Lighter weight , a dually should handle it fine eh ? Probably got/need trailer brakes too ! Done with Foamie walls and cabin , it should be pretty light for it’s size and capacity . Hmmm? :thinking:
There’s no place like Foam !
User avatar
GPW
Silver Donating Member
 
Posts: 13276
Images: 543
Joined: Thu Feb 09, 2006 7:58 pm
Location: New Orleans
Top

Re: Heavy load-bearing foamie

Postby John61CT » Mon Oct 02, 2017 1:23 am

I was starting with functionality, form will follow, so no graphic ideas.

3500 wet total weight means have to be minimal on the load-bearing, just enough for safety not over engineered like a car carrier 8-)

500 up top means not to too big a total size.

Looks like single axle way to go.
John61CT
The 300 Club
 
Posts: 417
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: Heavy load-bearing foamie

Postby trfkcop » Mon Nov 06, 2017 7:17 am

1" square tubing welded to the frame at the four corners PRIOR to foaming the walls, slip in roof rack after. Think of four "receiver hitches" on your roof to accept the rack (or racks if you didn't affix permanently)...
trfkcop
Teardrop Inspector
 
Posts: 4
Joined: Thu Oct 12, 2017 4:22 pm
Top

Re: Heavy load-bearing foamie

Postby John61CT » Mon Nov 06, 2017 10:57 am

Yes, rack must be removable for maintenance.
John61CT
The 300 Club
 
Posts: 417
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: Heavy load-bearing foamie

Postby John61CT » Mon Nov 06, 2017 11:32 am

I think the full tubing is heavier than necessary.

I'm now thinking four plain angle iron posts on the outside corners, mounted to the trailer frame.

Foamie shell for the living space enclosure, independent of the steel, but lateral dimensions sized to be "clamped" tightly by those four corner posts.

Rectangular profile tubing run along - sitting on, load partially distributed over - the top of the foamie side walls, but mostly carried by fixing to the posts at the corners.

Fixed with PlusNuts to the top of that tubing is RhinoRack or Yakima roofrack "track" for maximum flexibility, no components will touch the foam roof.

All that steel frame is as light (thin-walled) as possible, just strong enough to carry the load (yes dynamic bouncing) in the verticle dimension.

With careful sizing of both the steel frame and the foamie shell, so the former tightly grips the latter, the rigid foam acts as strong bracing to handle nearly all the lateral forces.

On second thought, maybe add some diagonal bracing at the steel frame's corners, shorter or longer depending where openings in the foamie shell are required.

The structural design of the foamie shell does not depend on any steel, the whole steel "cage" can be removed if needed for maintenance, or if the roof rack is no longer needed.
John61CT
The 300 Club
 
Posts: 417
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: Heavy load-bearing foamie

Postby Pmullen503 » Mon Nov 06, 2017 11:58 am

Here's what I did with mine.

Image

Image

The corners are (2) 2"x1.5" posts tied together top and bottom with 1/2 Plywood plates glued and screwed with a foam filler strip.

To those were bolted aluminum channels for Yakima racks.

Image

Here is the build log:http://www.tnttt.com/viewtopic.php?f=55&t=61836&p=1105335#p1105335

I've carried as many as three canoes and kayaks on it at 80 mph, plenty strong.
Pmullen503
Teardrop Master
 
Posts: 240
Images: 57
Joined: Sun Nov 23, 2014 1:33 pm
Top

Re: Heavy load-bearing foamie

Postby GPW » Mon Nov 06, 2017 3:27 pm

Ooh !!! Nice Rack !!! … :roll: :lol:
There’s no place like Foam !
User avatar
GPW
Silver Donating Member
 
Posts: 13276
Images: 543
Joined: Thu Feb 09, 2006 7:58 pm
Location: New Orleans
Top

Re: Heavy load-bearing foamie

Postby John61CT » Tue Nov 14, 2017 10:58 pm

Pmullen503 wrote:Here's what I did with mine.

Image

Image

The corners are (2) 2"x1.5" posts tied together top and bottom with 1/2 Plywood plates glued and screwed with a foam filler strip.

To those were bolted aluminum channels for Yakima racks.

Image

Here is the build log:http://www.tnttt.com/viewtopic.php?f=55&t=61836&p=1105335#p1105335

I've carried as many as three canoes and kayaks on it at 80 mph, plenty strong.
excellent, embedding posts right in the walls is nice and clean, and wood is light vs steel.

What would you estimate max load would be on the rack?
John61CT
The 300 Club
 
Posts: 417
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: Heavy load-bearing foamie

Postby Pmullen503 » Wed Nov 15, 2017 6:59 am

Hard to say, I doubt I've had more than 150 lbs. dead weight but wind loads have to be substantial. There is no evidence that it has moved after two years.

You could always add another set of bars and posts. 500lbs is a lot to put on a pair of Yakima racks.
Pmullen503
Teardrop Master
 
Posts: 240
Images: 57
Joined: Sun Nov 23, 2014 1:33 pm
Top

Re: Heavy load-bearing foamie

Postby John61CT » Wed Nov 15, 2017 8:29 am

Yes, looking to put the rack tracks along the top of the sidewalls (RhinoRack lets you use either foot type) for spreading the load, adding more when needed, and general flexibility.

Now thinking back to plywood in the walls sandwich
John61CT
The 300 Club
 
Posts: 417
Joined: Thu Nov 17, 2016 4:36 pm
Top

Previous

Return to Foamies

Who is online

Users browsing this forum: No registered users and 1 guest