Like Tree0Likes

What Size Aluminum I Beam

Reply
Old 02-24-2009, 05:42 PM
  #1
Registered
Thread Starter
Trade Score: (2)
 
Craney's Avatar
 
Join Date: Oct 2004
Location: Clayton NJ
My Boats: 28 Pantera 24 Python
Posts: 1,573
Default What Size Aluminum I Beam

I'm building a gantry crane to pull the engines out of my boat. I need to know what size aluminum I beam I should use for the top beam? I have 8 feet in between my 45 dergree angle.
Craney is offline  
Reply With Quote
Old 02-24-2009, 05:54 PM
  #2
Registered
 
jayhawk261's Avatar
 
Join Date: Jul 2005
Location: Tulsa, OK
My Boats: 2000 Superboat 24 Step Bottom - Fresh 501
Posts: 1,729
Default

That will depend on the aluminum alloy. I don't have any engineering data on aluminum. A steel 35ksi W8x10 at 8'-0" span simply supported at each end will hold a 7500 lb point load without exceeding the allowable stress of 24ksi. A W8x10x8'-0" would be relatively inexpensive, and will only weigh about 80 lbs. A W6x12 would hold a similar load and be a little shallower, but it will also be a little heavier.
jayhawk261 is offline  
Reply With Quote
Old 02-24-2009, 06:43 PM
  #3
GLH
Platinum Member
Platinum Member
 
GLH's Avatar
 
Join Date: Dec 2002
Location: Burlington, VT
My Boats: Azimut
Posts: 15,267
Default

Get a steel beam.

Any local steel shop will be able to calculate the load.
GLH is offline  
Reply With Quote
Old 02-24-2009, 06:48 PM
  #4
Registered
Thread Starter
Trade Score: (2)
 
Craney's Avatar
 
Join Date: Oct 2004
Location: Clayton NJ
My Boats: 28 Pantera 24 Python
Posts: 1,573
Default

Quote:
Originally Posted by GLH View Post
Get a steel beam.

Any local steel shop will be able to calculate the load.
I gona use aluminum to save on weight so I can take it a part.
Craney is offline  
Reply With Quote
Old 02-24-2009, 09:11 PM
  #5
Registered
 
jayhawk261's Avatar
 
Join Date: Jul 2005
Location: Tulsa, OK
My Boats: 2000 Superboat 24 Step Bottom - Fresh 501
Posts: 1,729
Default

I'm not sure how much weight you'll be able to save by going with aluminum. The section will have to be deeper and beefier than its steel counterpart which means that it will not be significantly lighter. I would guess around 15% - 20% lighter max. That isn't going to make that big of a difference.
jayhawk261 is offline  
Reply With Quote
Old 02-24-2009, 09:30 PM
  #6
Registered
Platinum Member
 
Comanche3Six's Avatar
 
Join Date: Sep 2003
Posts: 9,273
Default

http://www.spanco.com/cm/streamfile....4-3b6622075afa
Comanche3Six is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Griff
Active Thunder
2
06-06-2007 07:05 PM
Vyper340
General Boating Discussion
69
10-10-2006 10:15 PM
1BIGJIM
General Q & A
14
03-08-2006 03:32 AM
FASTERDAMITT
General Boating Discussion
36
09-15-2004 10:14 AM
surfacetension
Scarab
3
01-29-2003 09:53 AM



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 07:37 AM.


Copyright 2011 OffShoreOnly. All rights reserved.