Parachute Testing

[Pem Tech]

For example, this has an extremely high drag coefficient.

View attachment 301936

Yeah Coop, looks you have gotten into a whole new type of drag.

 

[Pem Tech]

View attachment 305686
CTI 29mm 6GXL I-243 White

View attachment 305689
Got a good handle on the "up" part.

View attachment 305691
"No... no, no, no, no, no, no... that's where Gollum lives! GAH!"

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Tantalizingly out of reach.

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"Hrrrmph."

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At least we have this...


Later!

--Coop

EGADS! That is a mighty ugly tree in the fifth picture.

 

[Coop]

EGADS! That is a mighty ugly tree in the fifth picture.

Aaah.. yes. The Rocketeeris Medicus Vulgaris...

Later!

--Coop

 

[rstaff3]

Too bad Fred was out of line.

 

[Pem Tech]

Continuing on in this pursuit... GT Mark V.

View attachment 303812

Later!

--Coop

Love the bundt cake design. Will you be marketing them?
*hint*
*hint*

 

[Coop]

Too bad Fred was out of line.

Tell me about it! Gah!


Later!

--Coop

 

[Coop]

Love the bundt cake design. Will you be marketing them?
*hint*
*hint*

I've given it some consideration, but there's more testing I'd like to do first. As it stands, this design is a bit labor-intensive so I would have to do some crunching before I could begin to think about price tag...


Later!

--Coop

 

[Winston]

I have routine access to a ~100ft drop. Is there particular testing which would be useful?

I was thinking of modified stock chutes ( standard, pulldown, spill hole, pulldown w/ spillhole ) on a few sizes. If it would be useful I could expand that, I suppose.

Not related to 'chute design, but some research on off-the-shelf nylon or metal spacers (cylinders) used as reefing rings to lesson opening shock might be useful.

 

[Coop]

Not related to 'chute design, but some research on off-the-shelf nylon or metal spacers (cylinders) used as reefing rings to lesson opening shock might be useful.

Excellent point--and yes, I've been exploring this avenue as well for future consideration. I've been kind of leaning toward delrin, though--figuring that would decrease wear on the lines...


Later!

--Coop

 

[dhbarr]

Excellent point--and yes, I've been exploring this avenue as well for future consideration. I've been kind of leaning toward delrin, though--figuring that would decrease wear on the lines...


Later!

--Coop

UHMWPE is nearly as slippery as Teflon, certainly more so than PTFE-impregnated acetal.

 

[Coop]

UHMWPE is nearly as slippery as Teflon, certainly more so than PTFE-impregnated acetal.

Good point--will give that some consideration as well, though I suspect this may be getting out of reasonable price range...

Have gores cut and paired up for next assembly--see how this one goes together...


Later!


--Coop

 

[dhbarr]

UHMW should be about a buck an inch for bar or tube stock, or just grab a bag of washers . [ trying to get other people to pay for all the science ]