Go Back   EcoModder Forum > Off-Topic > The Lounge
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-28-2019, 06:58 PM   #1 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 658
Thanks: 18
Thanked 140 Times in 124 Posts
In Cab Operated Electric Telescoping Trailer Tongue

My design to draw a trailer up for highway aerodynamics, and extend it back for tight turns around town. All done without having to leave the car.

  Reply With Quote
The Following User Says Thank You to Angel And The Wolf For This Useful Post:
Xist (04-28-2019)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-28-2019, 07:04 PM   #2 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 658
Thanks: 18
Thanked 140 Times in 124 Posts
After I designed this, I found the heavy duty, probably hydraulically operated, version on You Tube. Their version uses lock pins. My version counts on the gearmotor to prevent creep back. I will have a red light in the car to tell me that the trailer is pulled up tight, and if it creeps back, the light will go off, and I will push the "Draw Up" button. But I think the gear reduction in the gearmotor will be hard to run backwards through the all thread.
Here is the commercial version:
  Reply With Quote
Old 04-28-2019, 08:07 PM   #3 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 13,896
Thanks: 3,411
Thanked 4,574 Times in 3,642 Posts
I'm bothered by the way the inner or outer surface of each square tube is a bearing surface. Teflon buttons or something?

Why couldn't you have the motor at the hitch end? Could you get the gear drive inside the 3 1/2" pipe? Cut out two sides of the pipe and box the opening?
__________________
.
KONOSUBA -God's blessing on this wonderful world!
2019-11-12
_________________
  Reply With Quote
Old 04-28-2019, 08:45 PM   #4 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 658
Thanks: 18
Thanked 140 Times in 124 Posts
Quote:
Originally Posted by freebeard View Post
I'm bothered by the way the inner or outer surface of each square tube is a bearing surface. Teflon buttons or something?
Good suggestion. I'd have to use the .188 wall 3 1/2 inch tube in place of the .250 wall to make room for the buttons. Hope the mild steel won't bend.

Quote:
Originally Posted by freebeard View Post
Why couldn't you have the motor at the hitch end? Could you get the gear drive inside the 3 1/2" pipe? Cut out two sides of the pipe and box the opening?
Just seemed more sturdy to keep the front tube intact, and go into the non-load bearing end of the rear tube. I may overhang the carrier a bit, and protect the motor from rain.The Teflon idea is good, though. Will let me use lighter tubing.
  Reply With Quote
Old 04-28-2019, 08:54 PM   #5 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 658
Thanks: 18
Thanked 140 Times in 124 Posts
I AM a bit concerned about the shortened wheel base in Highway Mode. I've heard that shorter trailers are more skittish.
  Reply With Quote
Old 04-28-2019, 10:22 PM   #6 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 13,896
Thanks: 3,411
Thanked 4,574 Times in 3,642 Posts
I was taught that it's the ratio between the TV axle/hitch and hitch/trailer axle. Moving the hitch closer to the tow vehicle axle is [proportionally] equivalent to lengthening the tongue.

slowmover can tell you about a swinging hitch that does something similar. I don't recall the brand name or how it locks (or not).
__________________
.
KONOSUBA -God's blessing on this wonderful world!
2019-11-12
_________________
  Reply With Quote
Old 04-28-2019, 11:32 PM   #7 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 658
Thanks: 18
Thanked 140 Times in 124 Posts
Quote:
Originally Posted by freebeard View Post
slowmover can tell you about a swinging hitch that does something similar.
How can I find his posts?
  Reply With Quote
Old 04-29-2019, 01:32 AM   #8 (permalink)
Master EcoModder
 
slowmover's Avatar
 
Join Date: Oct 2009
Location: Fort Worth, Texas
Posts: 2,337

2004 CTD - '04 DODGE RAM 2500 SLT
Team Cummins
90 day: 19.36 mpg (US)
Thanks: 1,334
Thanked 675 Times in 513 Posts
A Jim Hensley patented hitch locks & unlocks. 120# without vehicle hitch receiver.

PULL RITE used to make a swinging constant-distance hitch. But it weighed over 400#.
__________________
2004.0 DODGE Ram QC/LB 2500 2WD/NV-5600 305/555 ISB. 7,940-lb. Stock. 200,000 miles/5000-hrs @ 40-mph average.
1990 35' Silver Streak TT 7,900-lb.
11-cpm solo & 19-cpm towing; 21-mpg average past 54k-miles
Sold: 1983 Silver Streak 3411
  Reply With Quote
The Following 2 Users Say Thank You to slowmover For This Useful Post:
freebeard (04-29-2019), Xist (05-28-2019)
Old 04-29-2019, 01:36 AM   #9 (permalink)
Master EcoModder
 
slowmover's Avatar
 
Join Date: Oct 2009
Location: Fort Worth, Texas
Posts: 2,337

2004 CTD - '04 DODGE RAM 2500 SLT
Team Cummins
90 day: 19.36 mpg (US)
Thanks: 1,334
Thanked 675 Times in 513 Posts
Quote:
Originally Posted by Angel And The Wolf View Post
I AM a bit concerned about the shortened wheel base in Highway Mode. I've heard that shorter trailers are more skittish.
Iíve my doubts thisíd work well (ROI), but pulling the trailer innclosexwouldnt otherwise concern me.

Moving the trailer axle rearward on trailer frame is an old method for better stability. But can trailer design handle it? It increases forces at other end (strain).
__________________
2004.0 DODGE Ram QC/LB 2500 2WD/NV-5600 305/555 ISB. 7,940-lb. Stock. 200,000 miles/5000-hrs @ 40-mph average.
1990 35' Silver Streak TT 7,900-lb.
11-cpm solo & 19-cpm towing; 21-mpg average past 54k-miles
Sold: 1983 Silver Streak 3411
  Reply With Quote
The Following User Says Thank You to slowmover For This Useful Post:
Xist (05-28-2019)
Old 04-29-2019, 03:07 AM   #10 (permalink)
Master EcoModder
 
Join Date: Nov 2013
Location: Texas
Posts: 658
Thanks: 18
Thanked 140 Times in 124 Posts
Quote:
Originally Posted by slowmover View Post
I’ve my doubts this’d work well (ROI), but pulling the trailer innclosexwouldnt otherwise concern me.

Moving the trailer axle rearward on trailer frame is an old method for better stability. But can trailer design handle it? It increases forces at other end (strain).
My design keeps the load centered over the axle, moving the load and axle as one unit. Only thing I see is that the horizontal center of gravity moves forward slower than the load and axle as the trailer is drawn up to the tow vehicle. Would need to locate the axle so that at full forward, there is still 200 lbs on the ball, but as the trailer tongue extends, that ball weight would increase.
(Have I got this backwards?)

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com