I am cuurently working on a project designing a telescopic stretcher for medical purposes. My product must hold 170kg, extract to 1.99m in length be light and contract small enough to be carried on a persons back. I need some assistance in the diameter of section tube I would require, I have not managed to get my drawings past the initial design stage but hopefully will have used these to convert to autocad shortly. trying to get information from anywhere is like trying to find rocking horse manure!!!

I do not think you can CAD design your way out of something like this .. The physical properties of the composites and shapes needed are just too complex or unknown...


If i had a reasonable budget to do this, I would buy a sample set of CF tubes, some Resin and some CF braided tape and braided hose.

I have made a 28 mm OD tube from some of EC's "woven finish CF tube, by adding some braided CF hose on top with resin and roll wrapped with shrink tape.

This tube easily holds my bodyweight (75 kg. ) over the 1 metre length. 

By slotting together suitable different outside/inside diameters together, and making sliding points from low friction material epoxied to the tubing, it should be possible to construct a telescoping stretcher. 

"Sapere Aude"... Dare to KNOW!

The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind...

103% of all people do not understand statistics...

Do not adjust our mind, theres a fault in reality :-)