Lmst

My glider needs the center of gravity shifted aft, so I need to add weight in the tail.

The first photo is looking into the rudder cove (rudder removed). I can bolt some lead plates to the flat face of the vertical fin spar, but I will need even more weight added back here.

Note that the rudder hinge support is glowing green...a flashlight on the other side is illuminating it.

That part is hollow and it's nothing but dead space. I can add lead shot and epoxy in there.

The second photo shows the view of this pale green fiberglass part from the other side. Before I can add lead shot in there, I need to add a dam to retain it while the epoxy cures.

Third photo shows a piece of scrap Plexiglas that fits up against the end of the rudder hinge support.

Final photo shows the Plexiglas dam glued into place with RTV silicone caulk. It has a semicircular cutout that allows a larger diameter piece of tubing to be placed there while I pour lead shot and epoxy into a funnel and fill that empty space.

Half of the caulking work was done blind and by feel. I am accessing this tight space from the inspection port in the side of the vertical fin. There is just enough room for one hand and this part to pass through the port and then get positioned. I practiced before applying the caulk so I knew exactly how to position and twist the part so that I didn't make a mess and most of the caulk ended up in the desired location.

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Epoxy #Ballast #Lead #Plexiglas

With the rudder removed, there is some space (up to an inch) between the rudder counterweight and the flat face of the vertical fin spar. That is dead space where I can bolt plates of lead for ballast.

Note the glowing fiberglass part. It's hollow and can accept lead shot and epoxy...by filling it from the other side.

The view from inside the tail boom. Most of the parts are carbon fiber, so it's quite dark in there. The pale green of the fiberglass part is visible, as well as its empty space that will soon hold lead shot and epoxy for tail ballast.

A piece of Plexiglass (I have not yet removed its frosted protective plastic) has been fit to the circular cross section of the tail boom. This new part will serve as a dam to keep the lead shot and epoxy from spilling into the rest of the tail.

The Plexiglas dam (now transparent with its protective plastic removed) has been glued/caulked into place with RTV silicone.

Half of the caulking work was done blind and by feel. I am accessing this tight space from the inspection port in the side of the vertical fin. There is just enough room for one hand and this part to pass through the port and then get positioned.

Wetten zum Jahr der Veröffentlichung der Fundstelle von EN 301 549 V4.1.1 im Amtsblatt der Union werden ab jetzt für 30 Tage angenommen:

#WAD #EAA #BITV #BFSG #Barrierefreiheit

The electric glider's two main batteries each weigh about 16 Kg (36 lbs). I need a positive restraint system that can handle vibration and especially negative G.

Yesterday evening I epoxied in place some retaining blocks for the two battery clamping bars, but the garage gets cold overnight. I placed an incandescent lamp over the top of the battery box and wrapped some towels as a 'tent' to keep the warm air from easily escaping. This allowed the battery box to stay slightly warmer and accelerate the curing of the epoxy.

The second photo shows one end of a battery clamping bar (yellow) that fits under a carbon fiber inverted shelf (black). On each side of the clamping bar there are now two blocks of garolite (pale green) that prevent the battery block from sliding off to the side.

Garolite (G-10) is commonly used as the substrate for printed circuit boards, and you can get it in significant thickness, which is what I need.

https://en.wikipedia.org/wiki/G-10_(material)

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Epoxy #Chemistry #Temperature #Garolite

The white fuselage tail boom has an incandescent lamp (in a reflective metal housing) sitting over the main battery box (not seen). Some towels are wrapped around the edge of the lamp housing to retain warm air in the battery box. In the background is a cluttered shop floor.

We are looking into the main battery box. A red plastic 'donut' is one of the main battery terminals. The interior of the battery box is mostly carbon fiber, which is black. The top of the batteries is black anodized aluminum. One end of a yellow battery clamping bar is visible as it fits under an inverted shelf of carbon fiber. On each side of the clamping bar are blocks of G-10 Garolite, which are epoxied to the inverted shelf. These blocks prevent the clamping block from shifting to either side.

For the glider's ground support equipment, there is good news and bad news in the first photo.

The good news is that the eScooter has more than enough pulling power to move the glider about on a smooth, level paved surface.

The bad news is that this version of the red tow bar means that any sideways push against the tail of the glider is transmitted to the eScooter...and makes it extremely difficult to keep the scooter from toppling over.

I had to re-design the tow bar.

The second photo shows what I've come up with. Now the wheel on the yellow tail dolly carries the weight of the glider's tail and reacts to any sideways loads. The eScooter merely needs to provide the pulling force and doesn't have to deal with those sideways forces. That should be much easier and safer for the driver.

The next time I assemble the glider at the airport, I'll give this towbar a final test with the eScooter.

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Logistics #Design #Dynamics #Physics

Side view of an assembled glider on the parking ramp of a local municipal airport. A yellow tail dolly is clamped around the aft end of the tail boom. The dolly has a castering wheel. A red tow bar is connected to the tail dolly's wheel axle, and it carries the glider's tail wheel...and all of this is connected to the aft end of an eScooter.

It's a sunny day and the sky is mostly blue with distant cirrus along the horizon.

Ahead of the glider's nose is a red ramp that allows the fuselage to be loaded into the aft end of a transport trailer.

A closer view of the glider's tail wheel, yellow tail dolly, and a re-built red tow bar. This is a view of the inside of a garage shop.

The tow bar no longer lifts the glider's tail. Instead, the tail dolly carries the weight of the glider tail.

Beyond the rudder's trailing edge (rudder not seen in this photo...it's been removed) the tow bar extends upward vertically to the correct hight to attach to the back end of the eScooter (not shown in the photo).

https://www.wacoca.com/news/2730983/ 超短期労働者100万人時代、高齢者の所得貧困率は1位…韓国の陰（2） – ライブドアニュース #‎‎ #Ação #EAA #IU #WorldNews #YAE

Agréablement surprise de voir que le site des bibliothèques de Paris a été mis à jour pour ajouter des informations sur l’accessibilité numérique des epubs que l’on peut emprunter.

Le site lui est encore loin d'être accessible malheureusement.

https://bibliotheques.paris.fr/numerique/doc/DILICOM/9782348092619/vivre-libre

#AccessibilitéNumérique #ePub #EAA

https://www.wacoca.com/news/2729145/ 家賃とローンの支払い抱え…香港の高層住宅火災1カ月、自宅失った被災者は新たな危機直面 – ライブドアニュース #‎‎ #Aa! #EA #EAA #WorldNews

German Auditors Reject Accessibility Overlays in EAA Context, by (not on Mastodon or Bluesky):

https://chrisyoong.com/blog/germany-rejects-accessibility-overlays-for-eaa-compliance

#accessibility #auditing #overlays #legal #eaa

https://www.wacoca.com/news/2728966/ 家賃とローンの支払い抱え…香港の高層住宅火災1カ月、自宅失った被災者は新たな危機直面 (2025年12月26日掲載) – ライブドアニュース #‎‎ #Aa! #EA #EAA #WorldNews

Where is the center of gravity of the empty glider located?

If you measure the location of the main wheel and tail wheel (reference to something such as the glider's nose), and the weight each of them carry...you can do the math to answer that question.

Where is the center of gravity when the pilot is in the glider?

Climb in, and then take the same measurements.

Now I know if I need to add trim weights to the nose or tail, and how much.

Determining center of gravity location is critical for safety of flight and good handling characteristics. I'll do these measurements and math more than once so I can be very confident of the results.

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Aerodynamics #Math #Mass #Weight #Balance #Safety

The glider is assembled and ready to be weighed at both wheels to determine the center of gravity location. Wing stands hold the wings level.

The main gear sits on an electronic measuring scale.

A home made ramp that allows me to roll the glider onto the scales. This ramp has a very shallow angle so that it does not take much force to get the glider up the ramp. This ramp is over five feet long and lifts only about 2-1/2 inches.

Yellow wooden wheel chocks sit on the ramp, ready to use.

机场Eagle (USA)航空天气是 “PAEG 242053Z AUTO 13014G35KT 10SM BKN110 M28/M34 A3010 RMK AO2 PK WND 12044/2004 SLP232 T12831344 56019 TSNO” : 查看上的含义 https://www.bigorre.org/aero/meteo/paeg/zh #eagle # #usa #paeg #eaa #metar #aviation #航空气象 #avgeek vl

#eaa . atelierco https://ift.tt/hqnt7Gk | posted by afasia | daily entries on contemporary art and architecture #afasiaarchzine #afasiaarq |

#architecture #arquitectura #design

The rest stop yochien . Kyonan EAA Endo Architect and Associates . Atel…

Lustig finde ich beim Thema #Barrierefreiheit auch, dass im Kontext der #WAD jeder niederländische Prüfbericht den ich jemals gesehen habe einfach ein #WCAG-Test ist.

Genau wie beim #EAA hat eins sich wahrscheinlich gedacht „wir nutzen erst einmal einfach das was wir schon haben“. Das funktioniert in der Praxis wesentlich besser und ist transparenter als diese deutsche Raiders of the Lost Ark-Lagerhalle voller streng geheimer BIK-BITV-Prüfberichte mit und ohne Stempel und wächsernem Siegel. 🙄

One surface of one glider wing has now been covered with mylar gap seal tape.

Tomorrow I will flip the wing over and apply gap seal tape to the other surface.

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Fairing #Drag #Aerodynamics

Man, there are so many different sources about the #EAA implementations in the different countries out there. And every one of them says something different.

Let’s take Croatia for example. There are many sources saying the maximum penalty is under or about 50.000€.

I don’t speak Croatian. I believe this is the official law saying it is up to 132.720€.

Who is right?

https://narodne-novine.nn.hr/clanci/sluzbeni/2025_06_89_1231.html#:~:text=(1)%20Nov%C4%8Danom%20kaznom%20od%206630%2C00%20do%20132.720%2C00,skladu%20sa%20zahtjevima%20za%20pristupa%C4%8Dnost%20propisanim%20ovim

EAA Deadlines, Why You Probably Can’t Wait Another 5 Years!, by (not on Mastodon or Bluesky):

https://axesslab.com/eaa-deadlines-why-you-probably-cant-wait-another-5-years/

#accessibility #eaa #legal #compliance

Gliders often go to significant lengths to reduce drag.

My flaperons are driven by a push-pull tube that exits the wing skin and pushes against an external drive horn. There are two of these setups on each wing...four external devices that need fairings.

But they and the flaperons move. That complicates things.

First photo shows one push-pull tube and drive horn without fairings.

Second photo shows the inner/smaller fairing that will eventually be glued into place.

Third photo shows both fairings in place and the flaperon near the limit of its down travel.

Fourth photo shows both fairings and the flaperon approaching the limit of its upward travel.

One fairing of the two pairs on one wing are drying overnight. Tomorrow morning, I will make final adjustments to the remaining inner fairings and then glue them in place.

I'm using RTV silicone, which needs humid air to cure well. It's winter in New Mexico and the air is super dry. I have put a very large pot of water on the wood stove to humidify the air overnight.

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Fairing #Drag #Aerodynamics

The flaperon push-pull tube exits the wing skin and is connected to an external drive horn on the flaperon at the trailing edge of the wing. This needs a fairing to reduce its drag. (Beyond the wing's trailing edge is shop clutter and equipment. On the wing is an old pink towel and a pair of left-handed scissors with orange plastic handles.

The aft (smaller) fairing is temporarily held in place with blue tape. This is only half the battle. We also need a fairing on the forward part of this assembly.

Both fairings are now in place. The forward (outer/larger) fairing has been glued to the wing's surface. The flaperon is near the lower limit of its travel.

Both fairings are in place, and the flaperon is near the limit of its upward travel.

I never wanted to know more about the #EAA than “make your products accessible or else you’re gonna get problems”, but here we are…

#a11y #Accessibility

I need to make a cloth canopy cover for the glider.

Now that I have the canopy installed, I can measure overall length of the planned cover and the width at various points.

I'll lay out a pattern on paper that is 1/4 or 1/3 of the overall width...like gores for a hot air balloon.

I have three different types of stretch fabric from very light to somewhat heavy. We'll see what results I get.

#AvGeek #Aviation #ElectricAircraft #Homebuilt #Glider #DIY #EAA #Sewing #Fabric

A yellow tape measure lies along the top of the glider's canopy. The canopy is covered with protective paper and edged with blue tape. The fuselage nose is at the right edge of the frame, which has two folding props covered in bright orange fabric.

The garage floor is gray and behind the fuselage is the clutter of various equipment and sundry items.

I just finished the first draft of a Youth Airplane Build charter for my EAA Chapter. I've never made one before but now I have a nice 5 page document specifying how the program will run. It needs some work, input from others, board approval, blah blah blah.

As a kid I never appreciated the amount of coordination and work things like this are, ignoring the complexity of building the aircraft itself. It should be a fun and rewarding experience once we get there.

#avgeek #kitplane #homebuilt #eaa

#EAA

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