You got to be kidding?

older racer · 08-27-2013, 11:11 PM

how much weld will be required to please nhra tech? full welds or partial welds? this is nothing more than a rip off to the sportsman racer. mr lemon is lining his pockets, same as the diaper guy. at the racers expense!! enough is enough. those teathers don't need to be SFI approved. thats a crock!

600ci · 08-27-2013, 11:41 PM

I got an idea im working on useing aircraft grade stainless cable and
aircraft clamping system

Toby Lang · 08-28-2013, 12:12 AM

Another thing, even if you do weld them they still might require you have the tethers. Or does the rule say if you weld them they aren't required?

SSDiv6 · 08-28-2013, 12:54 AM

There is no SFI Foundation specifications or testing criteria for the tethers.
Therefore, I assume it is up to NHRA to approve any solution for compliance with the rule.

A similar design to the one they offer can use an aerospace band clamp that meets Military Specification MS21920.
There are several vendors for these clamps in various sizes:

http://www.herberaircraft.com/pdf/Ot...20bulletin.PDF

http://www.clampco.com/products/products.asp

As regards to the cable and ends, they can also be procured from a few companies and it would require the swaging crimping tool and gauge.
Some sources for the cable, ends and tools are as follows:

http://www.mcfarlane-aviation.com/Pr...?CategoryID=47

http://www.aircraftspruce.com/catalo...ntrolcable.php

For guidance on assembling, strength requirements and testing the cable, I suggest checking out the FAA Mechanics Handbook and read Section 2-41 of the handbook and on. The link for the handbook is as follows:

http://www.faa.gov/regulations_polic...frame_vol1.pdf

Additional specification, assembly and testing guidance can also be found at the following link:

http://thecableconnection.com/cable-specification.html

I believe if you document the cable assembly, show load testing that meets the FAA guidance and requirements as objective evidence, NHRA should approve it.
Control cable assemblies are used in commercial and private aircraft in a daily basis and I do not believe the threshold is higher for retaining a header collector in the event it comes loose.

They also claim a "Patent Pending", well the concept, system and design is not patentable. A patent search will show many of the same concepts and ideas with patents.

Since it appears that Collector Tethers is a sponsor of this site, I do not know how long this message will last.

08-27-2013, 11:11 PM	#1
older racer Member Join Date: Aug 2010 Posts: 212 Likes: 13 Liked 68 Times in 26 Posts	Re: You got to be kidding? how much weld will be required to please nhra tech? full welds or partial welds? this is nothing more than a rip off to the sportsman racer. mr lemon is lining his pockets, same as the diaper guy. at the racers expense!! enough is enough. those teathers don't need to be SFI approved. thats a crock!

08-27-2013, 11:41 PM	#2
600ci Member Join Date: Mar 2012 Posts: 163 Likes: 5 Liked 3 Times in 1 Post	Re: You got to be kidding? I got an idea im working on useing aircraft grade stainless cable and aircraft clamping system

08-28-2013, 12:12 AM	#3
Toby Lang VIP Member Join Date: Jan 2002 Location: Auburn, WA Posts: 2,133 Likes: 2 Liked 2 Times in 1 Post	Re: You got to be kidding? Another thing, even if you do weld them they still might require you have the tethers. Or does the rule say if you weld them they aren't required?

08-28-2013, 12:54 AM	#4
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,043 Likes: 712 Liked 1,577 Times in 581 Posts	Re: You got to be kidding? There is no SFI Foundation specifications or testing criteria for the tethers. Therefore, I assume it is up to NHRA to approve any solution for compliance with the rule. A similar design to the one they offer can use an aerospace band clamp that meets Military Specification MS21920. There are several vendors for these clamps in various sizes: http://www.herberaircraft.com/pdf/Ot...20bulletin.PDF http://www.clampco.com/products/products.asp As regards to the cable and ends, they can also be procured from a few companies and it would require the swaging crimping tool and gauge. Some sources for the cable, ends and tools are as follows: http://www.mcfarlane-aviation.com/Pr...?CategoryID=47 http://www.aircraftspruce.com/catalo...ntrolcable.php For guidance on assembling, strength requirements and testing the cable, I suggest checking out the FAA Mechanics Handbook and read Section 2-41 of the handbook and on. The link for the handbook is as follows: http://www.faa.gov/regulations_polic...frame_vol1.pdf Additional specification, assembly and testing guidance can also be found at the following link: http://thecableconnection.com/cable-specification.html I believe if you document the cable assembly, show load testing that meets the FAA guidance and requirements as objective evidence, NHRA should approve it. Control cable assemblies are used in commercial and private aircraft in a daily basis and I do not believe the threshold is higher for retaining a header collector in the event it comes loose. They also claim a "Patent Pending", well the concept, system and design is not patentable. A patent search will show many of the same concepts and ideas with patents. Since it appears that Collector Tethers is a sponsor of this site, I do not know how long this message will last. Last edited by SSDiv6; 08-28-2013 at 12:59 AM.