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Search: Posts Made By: vlittle
Forum: RV General Discussion/News 06-15-2018, 12:08 PM
Replies: 11
Views: 719
Posted By vlittle
Scroll down here...

Scroll down here (http://www.vx-aviation.com/sprocket/empennage.htm) to see what I did. A lot of work.
Forum: Electrical Systems 06-14-2018, 06:03 PM
Replies: 41
Views: 1,899
Posted By vlittle
I still have CK722 transistors and 1N314 diodes. ...

I still have CK722 transistors and 1N314 diodes. Hoping they make a comeback, like vinyl records. Anyone who understands the last sentence is ooold!
Forum: RV General Discussion/News 06-14-2018, 09:11 AM
Replies: 28
Views: 1,252
Posted By vlittle
I would recommend a separate IDENT pushbutton for...

I would recommend a separate IDENT pushbutton for the transponder. Saves key pressess during busy times. I second the motion to have two 10 inch screens.

Consider ditching the backup instruments in...
Forum: RV General Discussion/News 06-09-2018, 06:02 PM
Replies: 11
Views: 912
Posted By vlittle
An ON-OFF-ON switch can be made to operate as an...

An ON-OFF-ON switch can be made to operate as an OFF-WIGWAG-ON switch
with the circuit shown in this link (http://vx-aviation.com/sprocket/photos/panel_elec/schematics-2/WWX-1A.pdf). The application...
Forum: RV General Discussion/News 05-30-2018, 04:18 PM
Replies: 187
Views: 65,086
Posted By vlittle
My second airplane is a Harmon Rocket. My third...

My second airplane is a Harmon Rocket.
My third airplane is, however...

http://www.vx-aviation.com/S-21/Wings/IMG_9.jpg
Forum: Electrical Systems 05-30-2018, 07:55 AM
Replies: 251
Views: 12,716
Posted By vlittle
I had Carling switch failures in my RV-9A leading...

I had Carling switch failures in my RV-9A leading to burnt wiring and terminals in 2006. I published a forensic analysis on VAF and Aeroelectric but it is now obscured in the depths of the interweb....
Forum: Glass Cockpit 05-10-2018, 07:32 AM
Replies: 16
Views: 3,724
Posted By vlittle
Update: Here's the PCB assembly. The ESP-32...

Update: Here's the PCB assembly. The ESP-32 processor module has been removed to show the board details. There are two trim motor drivers and a pair of relays for driving flaps.

This board works...
Forum: RV-8/8A 05-01-2018, 06:53 PM
Replies: 31
Views: 3,958
Posted By vlittle
A skid does not require cross-control... that's a...

A skid does not require cross-control... that's a slip.
Try a banked turn at low speed and add inside rudder... now you'll be upside down.
Forum: Glass Cockpit 04-25-2018, 09:45 AM
Replies: 9
Views: 2,976
Posted By vlittle
See this link for a simple external power port to...

See this link for a simple external power port to run a SkyView and charge its battery.

The rest of the aircraft does not power...
Forum: RV General Discussion/News 04-22-2018, 11:31 PM
Replies: 20
Views: 1,378
Posted By vlittle
I am targeting a pH of around 8.2.

I am targeting a pH of around 8.2.
Forum: RV General Discussion/News 04-22-2018, 08:03 AM
Replies: 20
Views: 1,378
Posted By vlittle
I blended my own degreaser using DEGBE, plus a pH...

I blended my own degreaser using DEGBE, plus a pH adjuster (sodium metasilicate) and surfactant (Dawn). I prepared a number of test coupons that compared the DEGBE preparation vs MEK. All were...
Forum: Electrical Systems 04-19-2018, 06:49 PM
Replies: 22
Views: 1,489
Posted By vlittle
I would extend this statement to say 'a high...

I would extend this statement to say 'a high quality properly rated switch'. Many of the switches used in E-AB Aircraft and sold by reputable suppliers have a high failure rate.

In my rocket, I...
Forum: Electrical Systems 04-15-2018, 05:34 PM
Replies: 8
Views: 745
Posted By vlittle
Charles, please also consider putting an...

Charles, please also consider putting an Arm/Disarm toggle switch in the system to unambigously cut power in an emergency. You don't want to be pumping oil in the event of a fire.

V
Forum: Glass Cockpit 04-10-2018, 06:44 PM
Replies: 16
Views: 3,724
Posted By vlittle
What Kevin said. It's an expensive function, but...

What Kevin said.
It's an expensive function, but it handles all kinds of electrical issues that cars and airplanes can experience.

When all else fails, there's always the fuse as well.
Forum: Glass Cockpit 04-08-2018, 07:39 PM
Replies: 16
Views: 3,724
Posted By vlittle
Here's the prototype schematic. Check back for...

Here's the prototype schematic. Check back for updates.

http://vx-aviation.com/documents/Falcon-ESP/Schematic_Falcon-ESP.png
Forum: Glass Cockpit 04-07-2018, 10:05 AM
Replies: 16
Views: 3,724
Posted By vlittle
The next generation aviation controller

Here's a teaser....

http://vx-aviation.com/documents/Falcon-ESP/Falcon-ESP_pcb.jpg

This project uses 4-layer SMT boards and is not as customizable as the Falcon-AVR through-hole design.

In many...
Forum: Electrical Systems 04-07-2018, 07:32 AM
Replies: 5
Views: 1,823
Posted By vlittle
For the type of work we do, you don't need custom...

For the type of work we do, you don't need custom libraries. Just create a symbol at the top level, then copy and past it as you need it. You can always save it to a library, but how many airplanes...
Forum: Glass Cockpit 03-16-2018, 06:29 PM
Replies: 32
Views: 3,882
Posted By vlittle
...proving once again that the only reason to...

...proving once again that the only reason to build an airplane is to design cool electronics gizmos to run it!
Forum: Glass Cockpit 03-16-2018, 10:20 AM
Replies: 32
Views: 3,882
Posted By vlittle
email sent. Perhaps we can get together when I'm...

email sent. Perhaps we can get together when I'm in Arizona.
Vern
Forum: Glass Cockpit 03-16-2018, 08:31 AM
Replies: 32
Views: 3,882
Posted By vlittle
Nice work! I really like this kind of stuff. If...

Nice work! I really like this kind of stuff.

If it helps, here are some of the configurations for the original SkyView wiring hubs. I released them as open source many years ago, but I love the...
Forum: Fuel Injection Systems 03-14-2018, 09:52 AM
Replies: 13
Views: 2,705
Posted By vlittle
...The weakest part of the EFII kit was always...

...The weakest part of the EFII kit was always the 1990s technology SDS ECU that was included....

It's a well known fact that no good technology came out of the 90's, as long as you ignore the...
Forum: RV General Discussion/News 03-06-2018, 03:31 PM
Replies: 24
Views: 4,056
Posted By vlittle
...the industry has been integrated into the U.S....

...the industry has been integrated into the U.S. economy for more than 50 years and that the Pentagon considers Canadian aluminum production a strategic military supply.
Forum: Electrical Systems 03-04-2018, 07:48 AM
Replies: 10
Views: 1,398
Posted By vlittle
It doesn't matter electrically if you use a...

It doesn't matter electrically if you use a 1N4006 or a 1N5400, but the 5400 is more mechanically robust.

After crimping it makes sense to solder the ends as well. Crimp terminals are not designed...
Forum: RV-9/9A 02-28-2018, 08:22 AM
Replies: 10
Views: 1,162
Posted By vlittle
There is a video of an RV performing a forced...

There is a video of an RV performing a forced landing in the water near a beach after a mid-air collision. The pilot had slid open his canopy before touchdown. ...
Forum: RV General Discussion/News 02-21-2018, 08:08 AM
Replies: 52
Views: 6,416
Posted By vlittle
+1 I could do very steep approaches in my 9A...

+1

I could do very steep approaches in my 9A with full flaps and full rudder. Sometimes it was preferred because the nose was so high, I had to slip to see the runway threshold.

Go practice it at...
Forum: Electrical Systems 02-20-2018, 10:01 PM
Replies: 24
Views: 2,055
Posted By vlittle
Yes, I use speed scheduling by sniffing the...

Yes, I use speed scheduling by sniffing the Airspeed from the SkyView serial stream. I show this method in Figure 1 here:...
Forum: Electrical Systems 02-20-2018, 08:01 AM
Replies: 24
Views: 2,055
Posted By vlittle
Good idea. I know from experience that you want...

Good idea. I know from experience that you want this stuff to be well protected from bad things (overvoltages, short circuits, ESD, lightning, high temperatures).

V
Forum: Electrical Systems 02-16-2018, 08:55 AM
Replies: 24
Views: 2,055
Posted By vlittle
A lesson learned from the development of my board...

A lesson learned from the development of my board is that it's really a limitation to have only one hardware serial port. In order to add WiFi and sniff a SkyView serial stream at the same time, I...
Forum: Electrical Systems 02-15-2018, 01:58 PM
Replies: 24
Views: 2,055
Posted By vlittle
I am using the Arduino port now, after much...

I am using the Arduino port now, after much manual futzing. I am part way through an electrical design for an ‘aviation grade’ pcb, but I have been overwhelmed by follow up from the CES.

V
Forum: Electrical Systems 02-15-2018, 11:39 AM
Replies: 24
Views: 2,055
Posted By vlittle
<from Vern> When I did my Falcon-AVR board, I...

<from Vern> When I did my Falcon-AVR board, I used the ESP8266 to provide WiFi connectivity. I've recently started using the ESP32, which has enough horsepower to replace the Teensy and ESP8266...
Forum: Electrical Systems 02-14-2018, 03:42 PM
Replies: 24
Views: 2,055
Posted By vlittle
All I have is a few blank pcbs. V

All I have is a few blank pcbs.
V
Forum: Electrical Systems 02-14-2018, 08:04 AM
Replies: 24
Views: 2,055
Posted By vlittle
Hi Matt, nice going. It is nice to see several...

Hi Matt, nice going. It is nice to see several folks using Arduino stuff in the cockpit. For reference, here is my thread on...
Forum: RV-12 02-01-2018, 04:56 PM
Replies: 21
Views: 6,094
Posted By vlittle
Let's say that the FAA changes the gross...

Let's say that the FAA changes the gross weight/stall speed restriction to a kinetic energy restriction.

A 1320 lb. LSA with a stall speed of 45 knots has the same kinetic energy at stall as an 1850...
Forum: RV-12 01-31-2018, 03:33 PM
Replies: 21
Views: 6,094
Posted By vlittle
LSA Gross Weight Restriction to be Removed?

Directly from a respected executive in the LSA/kitplane industry:

“The FAA is planning to remove the gross weight limitation on Light Sport Aircraft. Provided the airframe has the beef and power to...
Forum: RV Building Tips/Techniques 01-26-2018, 06:41 PM
Replies: 12
Views: 2,564
Posted By vlittle
I've seen this problem before when not enough...

I've seen this problem before when not enough pressure is applied by the riveter using the gun or squeezer. Pushing firmly down on the shop head side stops the rivet from riding up.
v
Forum: RV-8/8A 01-25-2018, 06:57 AM
Replies: 13
Views: 1,317
Posted By vlittle
Another version showing both Lemo and GA plugs,...

Another version showing both Lemo and GA plugs, but also with an aux power jack for other types of ANR headsets.

http://www.vx-aviation.com/sprocket/photos/panel_elec/schematics-2/AUDIO2.pdf
Forum: RV-4 01-24-2018, 06:12 AM
Replies: 14
Views: 1,169
Posted By vlittle
Or just fabricate a control...

Or just fabricate a control horn:

http://www.vx-aviation.com/sprocket/photos/controls/pitch_roll/20110420_0176.JPG
Forum: Electrical Systems 01-20-2018, 08:17 AM
Replies: 51
Views: 4,585
Posted By vlittle
Here's a good reference: ...

Here's a good reference: https://workmanship.nasa.gov/lib/insp/2%20books/frameset.html
More from down under: https://www.casa.gov.au/standard-page/ac-21-99-aircraft-wiring-and-bonding

V
Forum: RV-14 01-02-2018, 06:05 PM
Replies: 17
Views: 3,598
Posted By vlittle
Thrift store. Child's rain coat. Use the sleeves.

Thrift store. Child's rain coat. Use the sleeves.
Forum: RV-10 12-25-2017, 01:53 PM
Replies: 11
Views: 1,558
Posted By vlittle
From the...

From the manufacturer:

https://www.lycoming.com/sites/default/files/Lycoming%20Reciprocating%20engine%20Break-In%20and%20Oil%20Consumption.pdf
Forum: Electrical Systems 12-21-2017, 09:03 AM
Replies: 13
Views: 1,220
Posted By vlittle
My last airplane used an array of relays in...

My last airplane used an array of relays in sockets and bussed circuit breakers as a load center. All of my panel switches were low-current, controlling the relays.

My next airplane will use a...
Forum: Glass Cockpit 12-18-2017, 09:02 AM
Replies: 37
Views: 5,607
Posted By vlittle
AFS and Dynon are the same company.

AFS and Dynon are the same company.
Forum: RV-14 12-16-2017, 10:41 AM
Replies: 19
Views: 4,916
Posted By vlittle
Rob is correct, for the classic version. I am...

Rob is correct, for the classic version. I am now downloading the plus version and will report back.
Update: the plus version enhances pcb layout only, the schematic editor is essentially...
Forum: RV-9/9A 12-14-2017, 04:55 PM
Replies: 17
Views: 2,581
Posted By vlittle
Search the forums "Engine Power...

Search the forums "Engine Power Percentage?"
Forum: RV-8/8A 12-14-2017, 01:28 PM
Replies: 13
Views: 2,278
Posted By vlittle
Looking deeper, you have 3 ANLs doing the job of...

Looking deeper, you have 3 ANLs doing the job of one. Depending on the physical layout of your wires, I think this can be reduced.

For example, the ANL shown next to the alternator implies that...
Forum: RV-8/8A 12-14-2017, 08:53 AM
Replies: 13
Views: 2,278
Posted By vlittle
'Not good' just means that there's a better way....

'Not good' just means that there's a better way.

Charging bat2 should happen automatically when the alternator is alternating, and not depend on the second contactor, which itself is an...
Forum: RV-14 12-14-2017, 08:28 AM
Replies: 19
Views: 4,916
Posted By vlittle
ExpressSCH is stone simple. Example schematics...

ExpressSCH is stone simple.

Example schematics here http://www.vx-aviation.com/sprocket/photos/panel_elec/schematics-2/

Www.expresspcb.com

Whatever you choose, congratulations. A thoroughly...
Forum: RV-8/8A 12-13-2017, 11:54 PM
Replies: 13
Views: 2,278
Posted By vlittle
Batt2 will only charge when contactor 2 is...

Batt2 will only charge when contactor 2 is energized. Not good. Tie the cathodes of the diodes directly to the batt2.

V
Forum: RV General Discussion/News 12-11-2017, 09:27 PM
Replies: 13
Views: 1,974
Posted By vlittle
The rocket uses thicker skins which are almost...

The rocket uses thicker skins which are almost impossible to rollverlap (if that's a word).
Forum: RV General Discussion/News 12-08-2017, 08:59 PM
Replies: 13
Views: 1,974
Posted By vlittle
The Rocket...

The Rocket way:

http://www.vx-aviation.com/sprocket/photos/empennage/EMP_0002_3.JPG

The way I did it (on my Rocket):

http://www.vx-aviation.com/sprocket/photos/empennage/EMP_0003_2.JPG
Forum: Electrical Systems 12-08-2017, 10:00 AM
Replies: 2
Views: 630
Posted By vlittle
Here's one I recommend: Digikey...

Here's one I recommend: Digikey V30100S-E3/4WGI-ND. It's current capability and forward voltage drop was selected to limit the maximum charging current to the backup battery. The details of this are...
Forum: Electrical Systems 12-08-2017, 09:35 AM
Replies: 5
Views: 651
Posted By vlittle
http://www.vx-aviation.com/sprocket/photos/panel_e...

http://www.vx-aviation.com/sprocket/photos/panel_elec/schematics/TRIM.pdf

Shows more detail for an UP limit switch. Note that a properly installed actuator will not require (but still could use) a...
Forum: RV-14 12-05-2017, 07:39 AM
Replies: 9
Views: 1,714
Posted By vlittle
By the way, the dimples I see in your photo are...

By the way, the dimples I see in your photo are improperly done. You need to adust your squeezer to apply more force in forming the dimples so that they are crisp and do not distort the skin around...
Forum: RV General Discussion/News 12-02-2017, 08:05 AM
Replies: 559
Views: 114,093
Posted By vlittle
I think you will be detuning your antenna with a...

I think you will be detuning your antenna with a steel rod in close proximity. I defer to more recent engineering grads for this analysis.
Forum: RV General Discussion/News 11-28-2017, 08:24 AM
Replies: 559
Views: 114,093
Posted By vlittle
If you fly at exactly the same MAP and RPM and...

If you fly at exactly the same MAP and RPM and the same density altitude on 2 different days, you can see significant airspeed differences (multiple knots).

The error comes in because of the use of...
Forum: RV-7/7A 11-27-2017, 06:28 PM
Replies: 17
Views: 2,793
Posted By vlittle
Bingo! Many new builders underset their dimples,...

Bingo! Many new builders underset their dimples, and the best way to dimple is a c-frame or a properly adjusted pneumatic squeezer. The dimple should be crisp and the skins should not be wavey...
Forum: RV Building Tips/Techniques 11-23-2017, 01:15 PM
Replies: 20
Views: 2,502
Posted By vlittle
Oversize shank = undersize head. The NAS1097-AD3...

Oversize shank = undersize head. The NAS1097-AD3 3/32" rivets have a smaller head than regular AD3 rivets.
Forum: Rocket 11-14-2017, 09:38 AM
Replies: 6
Views: 867
Posted By vlittle
Well, it is British. Many British aircraft used...

Well, it is British. Many British aircraft used similar control assemblies, so it would difficult to determine the actual aircraft it came from. I have the opinion of the owner, but it's difficult...
Forum: Rocket 11-12-2017, 06:27 PM
Replies: 6
Views: 867
Posted By vlittle
Rocket Simulator

A little off topic, but I've been wanting to develop a simulator for my Harmon Rocket. I have an interest in a motion control company that builds flight sims, so this was a side project for...
Forum: Canada 11-07-2017, 10:42 PM
Replies: 93
Views: 11,156
Posted By vlittle
Read chapter 549 very carefully. It refers to...

Read chapter 549 very carefully. It refers to the lesser of 20.4 lb/sqft or the calculation in Appendix A.

Appendix A: ...
Forum: Canada 11-07-2017, 08:24 PM
Replies: 93
Views: 11,156
Posted By vlittle
There is another very significant benefit of...

There is another very significant benefit of registering your aicraft under the exemption: the definition of high performance aircraft. More specifically, the maximum wing loading. The exemption...
Forum: RV General Discussion/News 11-06-2017, 10:52 AM
Replies: 33
Views: 11,053
Posted By vlittle
I have a 12x16 fully enclosed car shelter tent,...

I have a 12x16 fully enclosed car shelter tent, shortened to 12x12 in one wing of my Tee hangar. I use a couple of halogen work lamps for heat and light, plus a small electric space heater when...
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