Arachnid build for big boys

[restorick]

Folks,

After building a stretch recluse model with my nephew 3 years ago, we've decided to test our skills on the Arachnid. Been reading everything I can and seem to have a handle on all the issues others have run into, except for one:

I would like to make this strong enough for my brother in law to ride. He's 6' 6", pushing 330 lbs. Is the 1.25x1.25 tube strong enough? Should I consider going to a 1x2 or 1.5x2 box channel for the sub-frame instead?

Appreciate any and all feedback. Thanks!
Rick

 

[fowler]

that should be Strong enough

if u are not happy u could build the lower frame out of recangle tube

i build my first buggy with 50mm x 25mm (2in x 1in

stronger yet same weight (or simmilar)

 

[machinist@large]

What wall thickness are the plan's calling out?

 

[restorick]

What wall thickness are the plan's calling out?

Calls for 14ga. Not sure if I can get 11ga in 1x1, but I think I can for the 1.25x1.25.

Perhaps that would be enough insurance, along with maybe an extra gusset or 4...

Rick

 

[OzFab]

It's better to use larger thin wall material than smaller thick wall material.

What do the plans recommend for maximum weight?

IMHO, I think fowler's idea is the best so far. For the main support structure, use 14ga 2.5" x 1.25" RHS (rectangular tube) & 1.25" x 1.25" for everything else which is mainly a cosmetic suppurt structure