.

.

All things hang gliding. This is the main forum. New users, introduce yourself.

Moderators: sg, mods

User avatar
By bisleybob
#250476
ok so after the recent cloud suck deployment video i got thinking.

is it possible to build a parachute with veriabe sink rate? we are always told to buy a chute size based on our all up weight and the type of air we fly in to give a sink rate of 5mps equivalent of jumpping off a 6 foot wall in terms of impact. and absolutly no more than 7mps equivalent of jumping from a 15 ft wall.

after the deployment video we have recognized the need for rapid decent.

here is the hypothesis for all the greatest org minds.

can a chute be made with maybee a pull chord flap system to regulate airflow and therfore decent rate like hot air baloons do sort of.
this was if in cloud open it up and shift your ass downward then when clear of cloud slow your ass up a tad.

answers below
User avatar
By bisleybob
#250477
my idea is this

fly with two reserves one small and one the right size.

use the normal one in all situations. but if in a cloud throw the little one then the big one once clear.
User avatar
By Fawkes
#250479
or something like on a paraglider to redurce surface: "making ears" by pulling the outer A-lines and make the screen deform temporarely ...
User avatar
By peanuts
#250481
line going up middle to center of chute. pull line, chute smaller volume.

idea #2. lock on swivel. as chute wraps up, descent increases. clear of clouds, release swivel (if it ain't too late) before chute looks like a cigar.
User avatar
By deeprecon1
#250482
bisleybob wrote:my idea is this

fly with two reserves one small and one the right size.

use the normal one in all situations. but if in a cloud throw the little one then the big one once clear.
Someone mentioned using a Drogue chute ...

I personally would like a ram-air double x ... however because we need a swivel and some xtra hang room it would not work for us ... this is just the military version of a free fall rig that can handle a combat load ...
User avatar
By bisleybob
#250490
deeprecon1 wrote:
bisleybob wrote:my idea is this

fly with two reserves one small and one the right size.

use the normal one in all situations. but if in a cloud throw the little one then the big one once clear.
Someone mentioned using a Drogue chute ...

I personally would like a ram-air double x ... however because we need a swivel and some xtra hang room it would not work for us ... this is just the military version of a free fall rig that can handle a combat load ...


i was thinking not a drouge but another seperate reserve of say half the required size so very fast decent.
alot of pg pilots have 2 in their harness.
User avatar
By airdynamic
#250504
Call me cynical but.....Is it not better to spend our time thinking of how not to get in to situations to have to throw a reserve.
After all there is so many people out there flying with very few needing to come down under a reserve.
We all know the dangers of looping gliders, some choose to do it knowing full well they may need to throw a reserve. Others like me prefer to not loop and not need to count on a reserve.

In my opinion...I fly as if I don't own a reserve.

Air
User avatar
By dave hopkins
#250535
airdynamic wrote:Call me cynical but.....Is it not better to spend our time thinking of how not to get in to situations to have to throw a reserve.
After all there is so many people out there flying with very few needing to come down under a reserve.
We all know the dangers of looping gliders, some choose to do it knowing full well they may need to throw a reserve. Others like me prefer to not loop and not need to count on a reserve.

In my opinion...I fly as if I don't own a reserve.

Air
I think you may have something there! :thumbsup: Hummm? huge cloud with hail and rain. Maybe we should fly AWAY! :mrgreen:

dave
User avatar
By NMERider
#250536
airdynamic wrote:....In my opinion...I fly as if I don't own a reserve....
Similarly, I fly as though deploying mine leads to rather uncertain outcome.
.
.
Did I ever mention the hundreds of high-tension wires that crisscross the landscape where I fly XC? Then there are the thousands of burnt conifer trees that resemble giant pongee sticks. The list goes on....
User avatar
By Dan Harding
#250538
I've seen the small drogue chutes at some landing zones, and they seem to do the job. Having one for the possibility of cloud suck might be a good idea.
User avatar
By CHassan
#250583
If you are worried about all that, rig a skydive chute and get the training. Then when the time comes, cut away, freefall, deploy and steer yourself back home.
User avatar
By bisleybob
#250585
CHassan wrote:If you are worried about all that, rig a skydive chute and get the training. Then when the time comes, cut away, freefall, deploy and steer yourself back home.
hmm good idea i like it
User avatar
By bisleybob
#250587
airdynamic wrote:Call me cynical but.....Is it not better to spend our time thinking of how not to get in to situations to have to throw a reserve.
After all there is so many people out there flying with very few needing to come down under a reserve.
We all know the dangers of looping gliders, some choose to do it knowing full well they may need to throw a reserve. Others like me prefer to not loop and not need to count on a reserve.

In my opinion...I fly as if I don't own a reserve.

Air
i knew someone would say that in fact i could have and nearly did in fact put it in my thread. but this thread is about designing new parachutes which is interesting and not how to avoid clouds.

there is a system that was designed to land a plane with complete hydraulic failiure based on powering the engines independantly. its not used as airlines say the expense is not warrented due to how rare an occasion all 3 seperate hydraulic systems failing together is.

i bet we would all vote it should be fitted anyway even if its never used. just because you plan to never get in danger does not meen you should not still plan to get out of it.

besides if a reserve system could be designed like this and cost the same as a normal one why not fly with it even if you only fly on a blue sky day.
User avatar
By bisleybob
#250588
my original idea of a small chute may not work.

i saw a guy deploy once with a small chute, quite a fast sink rate (he was obsessd with quick opening so got a smaller one but thats another discussion) anyway because he sank fast his wing kept trying to fly. a strange dance ensued with the wing picking up then stall and the chute taking over.

it did not look good with the chute at strange angles and scary like at any point it may give up.

you are going to need to go down pretty quick. a friend recently hit the top of a climb the lift strengthened 9 up he new this was now cloud suck he dove bar fully in to his waist. at full dive he was still going up he worked out taking off his dive speed and adding it to the amout he was still going up he was in 12 up.

a full five minutes he stayed like that intill it dropped off. he never even entered whispy bits.

i guess we need to know what is the max you can sink before the wing tries to fly (i know there are some aerodynamic minds on here that can answer that) then what would we need to escape a cloud then in theory we can asses weather anything can be made.
User avatar
By airdynamic
#250589
bisleybob wrote:
i knew someone would say that in fact i could have and nearly did in fact put it in my thread. but this thread is about designing new parachutes which is interesting and not how to avoid clouds.
Fair call mate...

I always thought hang gliders should be made like umbrellas....hold the keel and push the button. The whole thing pops open and off you go.

That could work for what you are talking here too tho. Shut it closed and when the time is right pop it open again :thumbsup:


by the way that idea is trade marked :mrgreen: so if you steel it and make millions you owe me one or two.

Cheers
Air
User avatar
By bisleybob
#250605
airdynamic wrote:
bisleybob wrote:
i knew someone would say that in fact i could have and nearly did in fact put it in my thread. but this thread is about designing new parachutes which is interesting and not how to avoid clouds.
Fair call mate...

I always thought hang gliders should be made like umbrellas....hold the keel and push the button. The whole thing pops open and off you go.

That could work for what you are talking here too tho. Shut it closed and when the time is right pop it open again :thumbsup:


by the way that idea is trade marked :mrgreen: so if you steel it and make millions you owe me one or two.

Cheers
Air
you may be onto something perhaps chutes are not the way forward. we already have VB adjust the shape of the wing what if it could but more making the wing really unefficient.

or even variable side wires that allow wiings to go really anheadral like seaguls do in strong wind. be a b**** to pull it back on though. prob make a glider weigh even more.

but all great inventions are spawned from crazy ideas.

Not real sure what "re-exported" them me[…]

Ride the Cloud

On the Devil's Dyke, a huge stone age earthwork ne[…]

Nice! Reminiscent of NMERider's flight video from […]

Questions on e-power

I am looking into e-power and have some questions […]