Cutaway handle with cable coming out both ends?

[ineed2fly 0]

Designing a cutaway handle for a project I'm working on, and I'm trying to figure out how to route the cable through the hard housings. (Problem would be more easily solved if someone knew where I could get the small diameter hard housing by the foot, and knows how I could put the brass ferules on the ends, and the end fittings with grommets onto them) But I have 2 options, get a finished (end fittings on them) set from paragear, and then a 19" section and link them together with some aquarium tubing and heat shrink over it to make them long enough (actually a little too long), which would allow both ends of the cable to come out the top of the handle. Or work without the 19" section as an extender and have the cable come out either end of the handle. So, does anyone see a problem with having a cutaway handle like on the left in the picture? (with cable coming out opposite ends)

Again, if anyone knows where I could order the housing by the foot with brass ferules to cap it that would be much simpler.

Thanks!

"As soon as you're born you start dying. So you might as well, have a good time."
-CAKE

I'm crazy not stupid. There is a difference.

[davelepka 4]

I'm not sure how well a cutaway handle with a cable on the top and bottom would work. Think about the motion of cutting away, you don't really pull out from the webbing, you pull down, in the opposite direction of the cable. In your example, there is no opposite direction.

In terms of custom length cutaway housings, call any rig manufacturer and see who can cut a swage you a set. Maybe Jumpshack? They seem to build a lot of their own parts.

[Hellis 0]

If there is not enough room between the pillow and the hardhousing, when you cut away you might get close to 90 degree angle on the cable which might jam it.

Ending the hardhousings in a slight angle out could help this problem.
I'm guessing one cable is for each riser? And as you have a skyhook/MARD system it would be bad to be hung up on one riser.
How about just using one cable that cuts the non-MARD side then a collins lanyard that disconnects the MARD side?
More complex but eliminates the problem with cable jaming and you won't be under 1.5 canopys by accident.

[mr2mk1g 10]

How do you peel the cutaway pad from the velcro before pulling? Looks like you're setting the user up to have to pull the pad from the velcro in sheer which may end up in an unacceptably hard pull.

[councilman24 37]

Since we don't know your project we can't comment on the geometry. But the issue about peeling (velcro in shear versus peel) is real. If it isn't a handle for the normal parachute release some other retention mechanism or less velcro may be applicable.

JCO metals, associated with Jump Shack, makes housing assemblies. I don't know if they will make a one off or at what cost.

http://www.jcometals.com/assemblies/assemblies_index.htm

I'm old for my age.
Terry Urban
D-8631
FAA DPRE

[KellyF 16]

Quote

How do you peel the cutaway pad from the velcro before pulling? Looks like you're setting the user up to have to pull the pad from the velcro in sheer which may end up in an unacceptably hard pull.

The easy way would be to sew the velcro in the pocket down only along the edge of the pocket closest to the handle. I woulld sew some 1" Ty-3 to the velcro first to give it some strength though.

[JerryBaumchen 1,454]

Hi 2fly,

Housings in almost any diameter you will want & in any lengths that you want can be purchased from:

Metal-Flex Hosing, Inc.
1241 E. Erie Avenue
Philadelphia, PA 191924

215-535-6868

mary@metalflexhosing.com

She is not so good at responding to emails but a phone call usually works.

Hope that this helps,

JerryBaumchen

PS) They also make ripcord pins & ripcord handles.

[riggerrob 643]

Or ... sew a pocketed cutaway handle similar to Strong's Dual Hawk Tandem.

[ineed2fly 0]

I am aware of the velcro shear peel strength difference, I'm building the handle like the handles on the Sigma tandem rig (the stiffened loop style ones, not the pillows). The handle will velcro on the same way.

Thanks for the input on the hard housings, I'll contact the manufacturers you linked me to and see if I can get ahold of some custom length housing instead of trying to make a bunch of lengths from paragear work. Which will allow me to have both cables come out the top.

On the note of the collins lanyard, I am going to try to build one into the system since a single riser release would be no bueno with a MARD system.

The project is a cutaway paragliding harness with a BASE canopy as a reserve, so the over the shoulder geometry is completely different from a skydiving container. The rings are at your hips instead of your chest, which is why I need the longer hard housing to cover that distance. And it makes adding a collins lanyard much more difficult as the lanyard would need to be 3-4' long, but it is doable.

It'd much better to be wondering how your 40 cell high aspect ratio high performance ZP parachute is suddenly an F111 7 cell, than to have the aforementioned parachutes trying to eat each other.

Of course with a collins lanyard I will need a break in the hard housing....

"As soon as you're born you start dying. So you might as well, have a good time."
-CAKE

I'm crazy not stupid. There is a difference.

[Hellis 0]

If you build a normal collins lanyard you will need two pieces of hardhousing.
But the collins lanyard is universal but your system does not have to be universal, correct?
So you can build a system that has the function of the collins lanyard, but not the universitality (is that a word?).

One cutaway handle with one cord going to the non-MARD side.
On the non-MARD riser you attach the second cord going trough a complete hardhousing to the second (MARD) riser.
So when the first riser is disconnected it pulls the cable disconnecting the second.
This will give you the lanyard effect in one way, but not the other. So if by any reason the MARD side disconnects you will be under 1.5 canopys.
But it will solve your problem with a two way cutaway handle and will not jam as the picture you showed can, and you can peel the velcro.

[JerryBaumchen 1,454]

Hi Nick,

Sorry, I really should look at profiles to see just who people are.

I got a call from Justin the other night ( he does like to call late at night doesn't he? ) and he said that you were out with a prototype harness.

I had hoped to get over to see it this week but too much going on, maybe next week.

JerryBaumchen

[riggerrob 643]

Your comments suggest a cutaway system similar to what Strong has been experimenting with for years. Strong's prototypes only have one cutaway cable, only routed to the right main riser.
When the right main riser releases, it pulls a second cutaway cable, which releases the left main riser.
Strong has been experimenting with this for many years, but has yet to release (excuse the pun) to the public. One problem is patent infringement with UPT's Collins Lanyard.

[Deyan 36]

Quote

The project is a cutaway paragliding harness with a BASE canopy as a reserve,

It'd much better to be wondering how your 40 cell high aspect ratio high performance ZP parachute is suddenly an F111 7 cell, than to have the aforementioned parachutes trying to eat each other.

10 years ago I was working on a similar project. At that time i couldn't find any paragliding pilot who was willing to cutaway his canopy, in order to get his reserve out. They rather try their single point, center line reserves. So we just decided that finishing the project was not worth it.

It's good to see that the time has changed
Keep us posted

"My belief is that once the doctor whacks you on the butt, all guarantees are off" Jerry Baumchen

[Hellis 0]

Well, that is probably two good reasons not to use that setup.
First that Strong has experimented with it for years, meaning it's not as easy as it seems.
And that patent probelm.

[piisfish 140]

something like This video?
or
THIS ONE
or
The Profly Groovy harness ?

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[Hellis 0]

Quote

something like This video?
or
THIS ONE
or
The Profly Groovy harness ?

Or maybe like this?

[ineed2fly 0]

Thats me

"As soon as you're born you start dying. So you might as well, have a good time."
-CAKE

I'm crazy not stupid. There is a difference.