I'm putting together a trailer for my buddies airboat, and I have a question or two about tandem axles.
I need to know how far apart to set the spring hangers. I've done a couple of single axels before, but the tandem has me stumped. Eye-to-eye on the springs is 25 3/16", and eye-to-eye on the tandem coupler is 5 3/4".
Also is it "better" to have the springs set over the axle, or under? I guess the better question would be what are pro's and con's of either?
Thanks in advance for any help on this one. I know there are a couple of trailer guys on here, and some of the previous posts have helped a ton already on this project.
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Thread: Building a trailer....
09-03-2008, 09:10 PM #1Junior Member
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- Jul 2008
Building a trailer....
09-03-2008, 10:53 PM #2
The big difference of over or under slung is the trailer height. Over slung will be higher with a small fender and under slung will be lower with a tall fender. Just put the side shakles for the rocker about a 60 degree angle. I will find you a picture..Bob
Look here: http://www.abctrailerparts.com
Last edited by aametalmaster; 09-03-2008 at 11:02 PM.Bob Wright, Grandson of Tee Nee Boat Trailer Founder
Metal Master Fab Salem, Oh 44460
Birthplace of the Silver & Deming Drill
1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
09-04-2008, 06:59 PM #3
You need to find the center point of where you will be placing the axle and mount your equalizer hanger there, then simply measure 30 1/2" forward for your front spring hanger and 30 1/2" rearward for the rear hanger.
Axle placement is generally suggested at the 60% rearward position for a 15% tongue weight, but the center of gravity will be different with the motor on an airboat hanging behind the axles, you may have to play around a bit to find your preferred location to ride correctly. If you have a problem getting the proper axle location let me know and I'll tell you how to do it with a bath scale.
As Bob has already stated the only real difference in the springs being over or under the axle is about 4 1/2" height difference. In your case I would think you would be better off with the axle above to keep the trailer lower for easier loading and unloading. DaveIf necessity is the Mother of Invention, I must be the Father of Desperation!
John Blewett III 10-22-73 to 8-16-07
Another racing great gone but not to be forgotten.http://video.google.com/videoplay?do...modified&hl=en
09-04-2008, 08:44 PM #4Junior Member
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- Jul 2008