[JoeF]

Free wingtips, no additional device
Circa 1965

RichardMillerEditorOfSoaringEditorOfLowSlowOutOfControl1965LaunchingOthers.jpg (21.56 KiB) Viewed 946 times

Image: Richard Miller is on the right (south) on ground sharing his wing with others ...

[JoeF]

UPDragonFlyRoyHaggardWingTip.jpg (22.04 KiB) Viewed 946 times

Similarwingtip.jpg (18.63 KiB) Viewed 946 times

Various treatments:

DragonAdlerEtc.jpg (38.68 KiB) Viewed 946 times

AdlerWingTios.jpg (6.77 KiB) Viewed 946 times

TruncationWngTip.jpg (46.22 KiB) Viewed 946 times

[JoeF]

Millenium

MilleniumWingTip.jpg (80.86 KiB) Viewed 946 times

MilleniumWingTip2.jpg (67.25 KiB) Viewed 946 times

MilleniumWingTip3.jpg (51.96 KiB) Viewed 946 times

MilleniumWingTip4.jpg (99.43 KiB) Viewed 946 times

MilleniumWingTip5.jpg (32.58 KiB) Viewed 946 times

[JoeF]

The wingtip of Experience by Lutz

ExperienceByLutzWINGTIPflightCirca1991.jpg (12.91 KiB) Viewed 942 times

ExperienceByLutzWINGTIPdrawing.jpg (4.02 KiB) Viewed 942 times

[JoeF]

Circa 1971
Conduit Condor
wingtip shown:

ConduitCondorRichardMillerWingTipsCirca1971photobyGeorgeUveges.jpg (52.18 KiB) Viewed 941 times

[JoeF]

John Reisig
14/11/2012
"Zodiac" model designed and manufactured originally by Suspended Animation, Concord, CA, USA by John Reisig in 1978 and later improved by Carlos T. Miralles in 1979. Yes it does look like a Seagull Seahawk but it isn't. Similar but different. Example: Winglets on the wing tips.

Suspended Animation started out as a dealership and evolved into Spectra Aircraft.

ZodiacWINGTIP.jpg (4.9 KiB) Viewed 936 times

[JoeF]

Can the sprog that helps assure dive recovery be further used by a modification in order to effect turning control? That question seems to have been mulled by Bill Cummings.

Joe,
This is my muse to put a dive recovery Sprog to work as a way to lift the trailing edge of the sail to assist in a turn. It has never been tried.
A light weight rod is attached to the cable on the Sprog with two split-bolts.
When the string is pulled it shortens the Sprog cable lifting the sail.
This add-on is inside the double surface.
The pilot shifting side to side will pull the string.
This may or may not be considered by you as you develop your 5 foot pack glider.

We share Bill's drawing of his idea. And then we wonder about the matter. All comers?
Drawing: Attached PDF format for clearest viewing.

ControlIdeaByBillCummingsNov3of2022shared.pdf

(201.03 KiB) Downloaded 82 times

==============
Bill, I will try such on one of my experimental One-Meter Packed Hang Glider machines. Thanks!
I have several control schemes; thanks for adding something to explore!
My first thought is about the lever amount that occurs from the sprog cable anchor to the sprog axial center. Short lever; the force needed to lift the sprog's angle may be considerable; the tension will grow and work the sprog-cable anchors. The flexibility of the sprog will play in results. We want sprogs to limit their down position in order to keep the sail safely positioned. But maybe a sprog that could be easily flexed up but not easily flexed down be a fact; maybe a directioned spog that bends up easily but is prevented from bending down. A sprog that had such orientation may need a fool-proof receiver slot to keep the easily-flexing side of the sprog on the up side.

Outer sprog and inner mid-wing sprog? Washout strut?

Sprog vs washout tube?

SprogAndWashoutTube.jpg (15.87 KiB) Viewed 926 times

Bart Doets
4 years ago
Sprogs action is not dependent on airspeed, but on angle of attack. In regular flying, like during the video, you could do without. Try a real vicious stall (start with lots of speed, climb out as steep as you can until it stalls) or try flying in real turbulence.
I've known a couple of people who died because sprogs had not yet been invented.

We have in hang gliding various VG tactics. E.g.

The carbon sprog of the centre section of each half-wing has been slightly compensated in order to provide variable washout at different VG configurations.

So, that VG scheme results in variable washout.
================================================
https://youtu.be/ZYFwDsJOqXE
https://youtu.be/_cKXww_Yf6E
https://youtu.be/8buVNqW5e2k

[JoeF]

WingtipAndDeflexorsAffectingLEandWingtip.jpg (77.46 KiB) Viewed 895 times

WingtipAndDeflexorsAffectingLEandWingtip2.jpg (17.12 KiB) Viewed 895 times

=========================

WingtipStudyCompareToKeelAngle.jpg (47.97 KiB) Viewed 894 times

[Frank Colver]

Lifting a tip to aid a turn may cause a problem like I had on my first Skysail configuration. I used up-only elevons thinking they would turn my wing. What happened was that the first reaction to the tilting up of the elevon caused an up pitch moment before any turn response. This sent the glider toward a stall and I quickly discarded the method and went to wingtip drag rudders instead.

BTW -m Tomorrow, November 5th, marks the 51st anniversary of the day i started construction of my wing.

Frank

[JoeF]

Today is the penultimate day of the 51st anniversary of the following wingtip treatment:

ColverSkySailWingTip001.jpg (13.56 KiB) Viewed 888 times

ColverSkySailWingTipElevonThatDidNotStayInLaterVersion.jpg003.jpg (18.7 KiB) Viewed 888 times

ColverSkySailWingTip002.jpg (3.68 KiB) Viewed 888 times

=========================================
=========================================
Millenium rigid wing hang glider rudder at wingtip and TE elevon also to wingtip:

Rudder and elevon on rigid wing Millennium hang glider

MilleniumRigidWingHGpostSwiftRudderTip.jpg (16.37 KiB) Viewed 888 times

Wing review article HERE in PDF format

===============================
Fledge II

FledgeIIwingtipRudder.jpg (1.56 KiB) Viewed 888 times

FledgeIIwingtipRudder02.jpg (47.98 KiB) Viewed 888 times

Manual in PDF

Fledge2showingRudderAndLowerWinglet.jpg (34.14 KiB) Viewed 888 times

Fledge2showingRudderAndLowerWinglet04.jpg (58 KiB) Viewed 888 times