Silicone Hinges

This is an article describing how to make silicone hinges along with several links to other resources on the same subject.

  • Video Demonstration by Andrew Mann
  • How-To Article on Slopeflyer.com
  • How-To Article on SMSA
  • From Joe Manor on rcgroups:

    Man, that sucks! Heres what I would do. First hold the hinge back in place at neutral and wick some thin CA into the torn area. If you need to tape off the surrounding areas to avoid getting glue everywhere then do so. The CA will actually attatch many of the tiny fibers that remain. Then take the edge of a diamond cutoff wheel or an abrasive wheel and use it to chase out any extra glue from the hingeline. I do this by hand without a dremel. Your hinge should seem normal at this point. You can unhook the linkage so you can drop the flap down 90 degrees. The hinge should still be working ok. Next, spread a thin layer of 3M5200 1mm thick 10MM wide across the hingeline on the inside of the wing. Then close the flap to neutral and tape the ends. On the outside retape the surrounding area of the hingeline and spread some 3M5200 into the hingeline. This should be wiped very thin so it’s basically lower than the wing surface. Then untape the surrounding area. Once dried this should hold up if all went well. You could always put a layer of tape over the hingeline after it’s dry for extra insurance.

    The other way to fix it would be to apply tape to the outside of the wing as step one. Then smooth the inside of the hingeline with the 3M5200 making sure that you force the material through the hinge into the tape by looking from the outside periodically as your moving across the damaged area. Once you have a good 1mm thick bead across the damaged area and the taped side has a smooth line of 5200 stuck to it then you can tape the flap at neutral and let it sit for a couple days. Leave the tape on for flight.

    The reason I mantioned two different ways is that sometimes when the hinges tear there is a lot of kevlar left and just using CA sometimes brings them back to really good shape. If that is the case with yours then you might be able to just back the hingeline up from the inside with the 5200 and not have any tape or 5200 on the outside for the best looking repair. Hard to reccomend the best option withoud putting my hands on it though. Hope this made sense.

    Joe

 


Outdoor Wireless Deployment

Deployed this arrangement to broadcast a wireless network from an outdoor antenna roughly 150′ from one house to another.

The ‘Indoor Extension AP’ utilizes a wireless uplink from the ‘Outdoor AP’ – and you can have multiple extension APs on the same network.

Configuration is all web-based – both devices are power over ethernet – took about 1.5 hours from start to finish (not including mounting the devices).

One very neat thing is that you can download a map via Google Maps which the software uses to estimate how the wireless reception range of each AP. It errored on the side of caution as we had a 99% strong signal (according to their own metrics) outside of the estimated range between the two APs.

The software also lets you block specific MAC addresses, keeps track of traffic by client device and many other niceties that a typical over-the-counter AP would not have.

ubiquiti_unifi_uap_table_illustration_one_big

Ubiquity Website


Quote on Open Source

“Open source culture tends to look down on personal recognition. Crowds, not people, make breakthroughs.”
– Aarti Shahani of KQED

You can listen to the original airing or read the transcript at http://www.npr.org/2013/07/08/200104701/drone-enthusiasts-uses-open-source-hardware-to-drive-innovation


Referencing local variables on a remote server using Invoke-Command

Beginning with PowerShell 3.0 it is much easier to reference local variables in scripts executed remotely via the Invoke-Command cmdlet.

On the host you are initiating the Invoke-Command from you simply set any variable you want. On the remote host you reference the variable with the $USING:var-name scope definition.

Example:

$ps_script is the path to the PowerShell script to be executed.

[initiating host]

PS C:>$example_var = “hi there”
PS C:> Invoke-Command -ComputerName $server -AsJob -JobName $job_name -FilePath $ps_script -Credential $cred

[contents of $ps_script]

$dereferenced_example_var = $USING:example_var

$dereferenced_example_var contains the string “hi there”


Extending an Airport Extreme wireless network with DD-WRT

Parts used:

  • Airport Extreme w/ 7.6.3 firmware
  • Buffalo WZR-300HP running DD-WRT (factory default)

Step 1: Configure the Airport Extreme to use “WPA2 Personal” as the Wireless Security type

Screen Shot 2013-05-07 at 7.44.00 AM

 

Step 2: Physically connecting the Buffalo router to your computer is the easiest way, if you do not have an ethernet port you can connect using a wireless link. Configure the Buffalo WZR-300HP (or any DD-WRT router) as follows:

  • Wireless Mode: Client Bridge (Routed) – this creates a secondary subnet
  • Wireless Network Mode: BG Mixed
  • Wireless Network Name (SSID): set to the same SSID as your Airport Extreme network
  • Click ‘Save’

Step 2b: Add a virtual interface by clicking ‘Add’ under the Virtual Interfaces section and configure the following:

  • Wireless Mode: AP
  • Wireless Network Name (SSID): set to something DIFFERENT than your Airport Extreme network SSID
  • Click ‘Save’

Screen Shot 2013-05-07 at 7.43.04 AM

Step 3: Click on ‘Wireless Security’ and configure the following:

  • Security Mode: WPA2-PSK
  • WPA Algorithms: AES
  • WPA Shared Key: the same password you used while configuring the Airport Extreme wireless security password
    I also clicked ‘Unmask’ just to be certain
  • Click ‘Save’

Step 3b: Set the security mode and password for your extended wireless network:

  • Security Mode: Can use whatever you want, even leaving it open. I chose the same as my primary network to keep things simple.
  • WPA Algorithms: Again, you can use whatever you want, I chose TKIP+AES
  • WPA Shared Key: I set mine to the same as my primary network
  • Click ‘Save’
  • Click ‘Apply’, it will take up to 2 minutes for the Buffalo router to reboot

 

 

 

Screen Shot 2013-05-07 at 7.43.24 AM

At this point if you are physically connected to the Buffalo router you should have internet access – you can also connect to it via the new SSID you configured and should still have an internet connection.


Repairing servos on Speedo MKII

I used Futaba S3114 servos for the ailerons.

servo centered, airleron taped straight

servo centered, airleron taped straight

i hope this blue tape keeps the CA from flowing into the horn

i hope this blue tape keeps the CA from flowing into the horn

used a servo testing tool to keep the servo horn from moving while gluing

used a servo testing tool to keep the servo horn from moving while gluing

clamped together with some balsa on the bottom to press servo evenly

clamped together with some balsa on the bottom to press servo evenly

this is clean

this is clean


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