Reply
 
Thread Tools Display Modes
Old 07-02-2015, 07:22 AM   #11
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
It can all be mathematically calculated.
__________________

__________________
OldCoot is offline   Reply With Quote
Old 07-02-2015, 07:33 AM   #12
Senior Member
 
Join Date: Dec 2012
Posts: 1,255
Quote:
Originally Posted by OldCoot View Post
It can all be mathematically calculated.
Of course it can. I just said, " there is no simple calculation". But to DO those type of calculations you would need additional weight measures at various points of your rig. Instead of taking it to the scales to get the weight measures you need to do the math for the tongue weight, why not just weight the tongue and be done with it.

__________________

__________________
rana is offline   Reply With Quote
Old 07-02-2015, 07:51 AM   #13
Senior Member
 
Crockett's Avatar
 
Join Date: Feb 2015
Posts: 833
Quote:
Originally Posted by OldCoot View Post
Theoretically, the 300lbs placed 60" from pivot would put 90# at the end of a 200" tongue.

BTW, mathematically it is a class 2 lever

(f1)(d1)=(f2)(d2)
300x60=f2x200
18000=200f2
18000/200=90
90 pounds would be the additional weight to the axles. The walking beam pivot would be the fulcrum. The distance to the load is 200" minus the 60". The correct additional tongue weight would be 210 pounds. 300x140/200
__________________
Crockett is offline   Reply With Quote
Old 07-02-2015, 08:57 AM   #14
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
Quote:
Originally Posted by Crockett View Post
90 pounds would be the additional weight to the axles. The walking beam pivot would be the fulcrum. The distance to the load is 200" minus the 60". The correct additional tongue weight would be 210 pounds. 300x140/200
Now that is funny, but the amount of additional load on the end of the tongue is 90#. The additional load on the walking beam is 210#.
__________________
OldCoot is offline   Reply With Quote
Old 07-02-2015, 09:02 AM   #15
Senior Member
 
Join Date: Dec 2012
Location: Windsor, Ontario, Canada
Posts: 631
Oh for crying outside, here we go......
__________________
Pipeman is offline   Reply With Quote
Old 07-02-2015, 01:17 PM   #16
Senior Member
 
Crockett's Avatar
 
Join Date: Feb 2015
Posts: 833
the 300 pound load....is it closer to the coupler or the axle??
__________________
Crockett is offline   Reply With Quote
Old 07-02-2015, 01:25 PM   #17
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
Quote:
Originally Posted by Crockett View Post
the 300 pound load....is it closer to the coupler or the axle??
MY BAD, OP did say it is 60" from coupler, I need to read a little closer, so it would add 210# to tongue wt.
I apologize to you Mr. Crockett!
__________________
OldCoot is offline   Reply With Quote
Old 07-02-2015, 01:48 PM   #18
Senior Member
 
Crockett's Avatar
 
Join Date: Feb 2015
Posts: 833
all done in the interest of just trying to get at the facts...my deepest respect for you Coot.
__________________
Crockett is offline   Reply With Quote
Old 07-02-2015, 02:56 PM   #19
Senior Member
 
Crockett's Avatar
 
Join Date: Feb 2015
Posts: 833
probably a pertinent time for this post. I never considered myself a type "A" personality type. But I now believe those are the type of people that take time to post here..and I may be correct this time. I could imagine, whether a board of directors or a rock band, differences arise all the time. Doesnt mean were argumentative or "A" holes. Its ok to keep presenting your case if you still have pertinent points...if you still are on task even if the thread evolves a different direction IMO. Repeating yourself or resorting to insults is just self debasing. Ive learned a lot here...even a little about RVs..actually a great deal.. Ive learned to appreciate every personality here as well. I love it here, these boards are alive!! Now lets DO have a good day gentlemen...
__________________
Crockett is offline   Reply With Quote
Old 07-02-2015, 11:53 PM   #20
Member
 
Join Date: Apr 2012
Posts: 88
But would we have to trade the 3/4 ton SRW for a 1 ton DRW, if we added 300lbs? Seriously, the best I recollect from physics class, you would have the fulcrum 60 inch in on a 200 inch run (the midpoint of the add'l weight). Hence 70% of the mechanical advantage is between the fulcrum and wheels, meaning the wheels are carrying 30% of the weight with 70% borne by the hitch.
Therefore 300lbs x (100%-70%) = 90 lbs to the wheels and 210lbs to the hitch. What the heck. Old Coots formula may be easier to understand.
__________________

__________________
fvstringpicker is offline   Reply With Quote
Reply

Tags
weight

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:53 PM.