payout

Forum for SW Texas Hang Gliders Club - Southwest Texas

Re: payout

Postby SamKellner » Sun Nov 13, 2016 6:21 am

Bill,

That sounds like some good ideas.
Southwest Texas Hang Gliders
US Hawks Hang Gliding Assn.
Chapter #4
User avatar
SamKellner
Contributor
Contributor
 
Posts: 1107
Joined: Mon Aug 30, 2010 7:15 pm
Location: SW Texas

Junk Yard Parts?

Postby Bob Kuczewski » Sat Dec 09, 2017 3:24 pm

I just had a long chat with one of my hang gliding friends, and he described an idea he had for a payout system using a MacPherson strut assembly with the hub, wheel, and brake already assembled and ready to bolt to a truck bed. He also described using a windshield wiper assembly as the "level winder" for retrieval.

Has anyone seen those kinds of components used in towing?
Join a National Hang Gliding Organization: US Hawks at ushawks.org
View my rating at: US Hang Gliding Rating System
"History is never recorded by truth never told." - Warren ("Free")
User avatar
Bob Kuczewski
Contributor
Contributor
 
Posts: 5418
Joined: Fri Aug 13, 2010 2:40 pm
Location: San Diego, CA

Re: payout

Postby Bill Cummings » Sat Dec 09, 2017 9:54 pm

No but I would sure like to see a YouTube video with one.
User avatar
Bill Cummings
Contributor
Contributor
 
Posts: 2714
Joined: Wed Jul 13, 2011 6:20 pm
Location: Las Cruces NM 88005 (Region 4)

Re: payout

Postby Bill Cummings » Fri Jan 11, 2019 4:11 pm

https://www.youtube.com/watch?v=ilD-0Mw_9qg

ALMOST LOCKOUT (Pilot Error.)
Without a doubt there is a left crosswind. (Wind sock at 0:09 showing 35 to 45 degrees.)
On the front truck rack the ribbon is showing left crosswind. (Visible to the right of the carabiner.)
After the glider leaves the truck the keel no longer lines up with the tow road. (Left Crosswind.)
The pilot tries to maintain position behind the truck and over the tow road.
The pilot should have allowed the glider to drift to the right side of the tow road.
The pilot needs to be down wind of the truck not behind it due to the crosswind.
All the crabbing that the pilot did should have always been to the right side/down wind of the road.
The pilot crabs too much and has the glider on the left side/up wind side of the road. (Wrong side.)
As the glider gains altitude above the field the wind speed will be greater.
In this greater wind speed and due to elasticity in the tow line and inertia involved to speed up the payout drum tension will increase momentarily.
This (extra momentary tension.) will narrow the, Sweet Spot, where the pilot should be.
The Sweet Spot will be found down wind of the tow vehicle and not over the road. (And certainly not left/up wind of the tow road.)
With a low tension climb the Sweet Spot will be broad left to right.
With a high tension climb the Sweet Spot will be narrow.
While holding the glider behind the tow truck while towing in a crosswind any increase in line tension will move the lockout boundary to the glider. In this case toward the left wing tip. The glider will then lockout to the left.
On final, note the keel is still aiming left of the corn rows still proving a left crosswind.
Flip-Flops are not the best option for a foot landing.
Tow line recovery parachutes can blossom if tension is lost and the pilot can overtake the chute and get tangled up with it.
https://www.youtube.com/watch?v=ilD-0Mw_9qg
User avatar
Bill Cummings
Contributor
Contributor
 
Posts: 2714
Joined: Wed Jul 13, 2011 6:20 pm
Location: Las Cruces NM 88005 (Region 4)

Re: payout

Postby Bill Cummings » Fri Jan 18, 2019 8:15 pm

On the above video there is nothing unsafe about a platform launch with a 40 degree crosswind to the tow road at the wind speed indicated by the wind sock.
Crosswind launches from a platform launch (PL) are much safer than foot launch (FL) with a crosswind.
It has everything to do with the relative wind direction when doing a platform launch.

For example, if there is a 10 mph, 40 degree, left crosswind while doing a platform launch by the time the vehicle is doing 10 mph (On the vehicle's speedometer.) the relative crosswind will be only 20 degrees left crosswind at just a little under 20 miles per hour total airspeed (For the hang glider.)
The good news is, you will be speeding up the vehicle about another 10 miles per hour more to have enough airspeed for a safe launch. This will further decrease the relative angle of the crosswind. The ribbon on the front of the platform vehicle will be indicating hardly any crosswind at all.

When you add to the fact that you will be well above stall speed before you commit to launch (Usually not the case while foot launching.) you should be able to see that when it comes to the two concerns of crosswind and getting above stall speed for launching PL is a lower risk than FL.
If you should stall a tip after lift off from PL you also won't have a cliff face to avoid.
After lift off from PL in a crosswind allow the glider to drift to the downwind side of the tow road. Crab parallel to the road on the downwind side. The only time you want to be straight behind the tow vehicle is when the wind is lined up with the road.
User avatar
Bill Cummings
Contributor
Contributor
 
Posts: 2714
Joined: Wed Jul 13, 2011 6:20 pm
Location: Las Cruces NM 88005 (Region 4)

Previous

Return to SW Texas Hang Gliders Forum

Who is online

Users browsing this forum: No registered users and 4 guests