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Search: Posts Made By: vlittle
Forum: Electrical Systems Today, 09:01 AM
Replies: 23
Views: 1,287
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, 09:55 AM
Replies: 23
Views: 1,287
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, 02:58 PM
Replies: 23
Views: 1,287
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, 12:39 PM
Replies: 23
Views: 1,287
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, 04:42 PM
Replies: 23
Views: 1,287
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, 09:04 AM
Replies: 23
Views: 1,287
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, 05:56 PM
Replies: 20
Views: 3,677
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, 04:33 PM
Replies: 20
Views: 3,677
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, 07:41 PM
Replies: 12
Views: 2,014
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, 07:57 AM
Replies: 13
Views: 853
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, 07:12 AM
Replies: 14
Views: 828
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, 09:17 AM
Replies: 51
Views: 3,600
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, 07:05 PM
Replies: 17
Views: 3,098
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, 02:53 PM
Replies: 11
Views: 1,363
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, 10:03 AM
Replies: 13
Views: 1,080
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, 10:02 AM
Replies: 37
Views: 5,166
Posted By vlittle
AFS and Dynon are the same company.

AFS and Dynon are the same company.
Forum: RV-14 12-16-2017, 11:41 AM
Replies: 16
Views: 2,541
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, 05:55 PM
Replies: 17
Views: 2,224
Posted By vlittle
Search the forums "Engine Power...

Search the forums "Engine Power Percentage?"
Forum: RV-8/8A 12-14-2017, 02:28 PM
Replies: 13
Views: 1,918
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, 09:53 AM
Replies: 13
Views: 1,918
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, 09:28 AM
Replies: 16
Views: 2,541
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 12-14-2017, 12:54 AM
Replies: 13
Views: 1,918
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, 10:27 PM
Replies: 13
Views: 1,796
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, 09:59 PM
Replies: 13
Views: 1,796
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, 11:00 AM
Replies: 2
Views: 582
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, 10:35 AM
Replies: 5
Views: 582
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, 08:39 AM
Replies: 9
Views: 1,440
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, 09:05 AM
Replies: 414
Views: 79,492
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, 09:24 AM
Replies: 414
Views: 79,492
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, 07:28 PM
Replies: 17
Views: 2,555
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, 02:15 PM
Replies: 20
Views: 2,275
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, 10:38 AM
Replies: 6
Views: 816
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, 07:27 PM
Replies: 6
Views: 816
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, 11:42 PM
Replies: 93
Views: 10,649
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, 09:24 PM
Replies: 93
Views: 10,649
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, 11:52 AM
Replies: 33
Views: 10,372
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...
Forum: Electrical Systems 11-06-2017, 09:57 AM
Replies: 46
Views: 3,768
Posted By vlittle
Switches of any kind become a failure point. Use...

Switches of any kind become a failure point. Use the highest quality mil spec devices you can find. Honeywell is better than Carling, but no guarantees. I still have a bunch of faulty Carlings...
Forum: Electrical Systems 11-03-2017, 09:23 AM
Replies: 46
Views: 3,768
Posted By vlittle
John. Any wire connected to the PC680, if more...

John.
Any wire connected to the PC680, if more than a few inches long, needs to be protected. You have 10 and 12 gauge wires, plus a #6 downstream of the master contactor that can all be smoked ...
Forum: Rocket 10-30-2017, 09:29 AM
Replies: 14
Views: 801
Posted By vlittle
Loops are in the Rocket, but will work on any RV.

Loops are in the Rocket, but will work on any RV.
Forum: Rocket 10-30-2017, 08:18 AM
Replies: 14
Views: 801
Posted By vlittle
The way these fuel vents work, if installed...

The way these fuel vents work, if installed properly, is that they provide a reservoir for expanding fuel. The internal vent must run right to the highest point of the tank. If this end is not...
Forum: Glass Cockpit 10-24-2017, 07:03 PM
Replies: 9
Views: 1,921
Posted By vlittle
Hi Scott. I freed up some space on my PM account...

Hi Scott. I freed up some space on my PM account now.

You can check this link for the documentation: http://www.vx-aviation.com/documents/

Thx
Forum: COMM 10-23-2017, 10:43 PM
Replies: 3
Views: 380
Posted By vlittle
Here's what I did. ...

Here's what I did. http://www.vx-aviation.com/sprocket/audio.htm

Vern
Forum: Glass Cockpit 10-23-2017, 08:05 PM
Replies: 9
Views: 1,921
Posted By vlittle
Update on Falcon-AVR

Well, I have just finished another massive coding project on the Falcon-AVR. I added flaps and trim presets to the basic(!) autotrim controller function that I have been flying with.

I also climbed...
Forum: RV-9/9A 10-17-2017, 08:46 AM
Replies: 53
Views: 15,482
Posted By vlittle
I would do overhead approaches in formation with...

I would do overhead approaches in formation with -6s -7s -8s and Swifts. It would require, at times full forward slips to bleed energy and fit in with the rest of the formation.

It was not a...
Forum: Fuel Injection Systems 10-16-2017, 03:56 PM
Replies: 9
Views: 673
Posted By vlittle
It looks to be a lot easier to install from new...

It looks to be a lot easier to install from new rather than convert an existing install. Michael is rebuildinghis entire FWF plus more.... but having fun!

The weight of a dual battery/alternator to...
Forum: Fuel Injection Systems 10-16-2017, 10:22 AM
Replies: 9
Views: 673
Posted By vlittle
It looks to be a lot easier to install from new...

It looks to be a lot easier to install from new rather than convert an existing install. Michael is rebuildinghis entire FWF plus more.... but having fun!

The weight of a dual battery/alternator to...
Forum: Fuel Injection Systems 10-13-2017, 03:03 PM
Replies: 9
Views: 673
Posted By vlittle
Good replies, thanks. Corollary question: what...

Good replies, thanks.

Corollary question: what about cost differentials?
Forum: Fuel Injection Systems 10-13-2017, 11:21 AM
Replies: 9
Views: 673
Posted By vlittle
SDS EM5 installed weight

Question for Ross:

Comparing apples:
What is the total installed weight of your EM5 dual injection/ignition system (4 cylinder)? This should include everything except the electrons.

How does this...
Forum: RV-4 10-11-2017, 10:32 AM
Replies: 9
Views: 1,206
Posted By vlittle
More detail on how I modified the forward...

More detail on how I modified the forward attachment on my HROC to allow for flat wing root fairings.

http://www.vx-aviation.com/sprocket/photos/wings/20110514_0232.JPG

More pictures...
Forum: COMM 09-25-2017, 07:50 PM
Replies: 4
Views: 1,186
Posted By vlittle
Ideally, option 1 with the shield grounded at...

Ideally, option 1 with the shield grounded at either end (to the audio ground) would be the best. Your noise source will be the difference in ground potential between the comm and the audio panel,...
Forum: Electrical Systems 09-23-2017, 09:53 AM
Replies: 9
Views: 768
Posted By vlittle
You don't need a relay for PTT. For trim and...

You don't need a relay for PTT.
For trim and flaps, you do need relays or a controller such as Rich Meske's FPS or a Safety Trim controller.

Here's a trim and flaps example (using my own auto-trim...
Forum: Electrical Systems 09-09-2017, 08:56 PM
Replies: 16
Views: 981
Posted By vlittle
There is a historical discussion on VAF on this...

There is a historical discussion on VAF on this topic, however, the photos have been disappeared. I have the photos from my failed strobe switch.

Here's what happens: Switching power supplies, such...
Forum: Fiberglass 09-09-2017, 08:32 PM
Replies: 17
Views: 2,289
Posted By vlittle
Many high performance aircraft (e.g warbirds) use...

Many high performance aircraft (e.g warbirds) use fabric covered control surfaces for weight reduction. Well researched and cheaper than CF.
Forum: RV General Discussion/News 08-13-2017, 12:50 PM
Replies: 2
Views: 496
Posted By vlittle
Sounds about right, but don't finish the...

Sounds about right, but don't finish the balancing until after paint.
The Van's weights are sized to accomodate the electric trim servo and tab on the L side, so it's overkill for the R side.

It...
Forum: COMM 08-13-2017, 08:52 AM
Replies: 1
Views: 423
Posted By vlittle
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=111560&highlight=Bluetooth+vern
Forum: Traditional Aircraft Engines 08-08-2017, 08:01 PM
Replies: 10
Views: 1,424
Posted By vlittle
It was a bit of work, but I made a propshaft seal...

It was a bit of work, but I made a propshaft seal for my HR-II. All air inside the cowling is high pressure air. You don't want it flowing out behind the spinner.

I paid attention to all of Tom's...
Forum: Rocket 07-14-2017, 07:23 PM
Replies: 21
Views: 5,302
Posted By vlittle
Nice paint job... not sure about the blue, though...

Nice paint job... not sure about the blue, though 😉.

Must be a trend, here's mine.

http://www.vx-aviation.com/sprocket/photos/flying/voltar.jpg
Forum: Glass Cockpit 07-11-2017, 07:46 PM
Replies: 9
Views: 1,921
Posted By vlittle
WiFighter!

Here's a couple of pics of the Falcon-AVR + Talon-AVR (Teensy) and a WiFi board plugged in to Serial1 (first pic) or Serial2 (second pic)

I'm having way too much fun with this, but the hardware is...
Forum: RV-14 07-10-2017, 04:20 PM
Replies: 30
Views: 4,451
Posted By vlittle
Connect a 20' long hose with approprate fittings...

Connect a 20' long hose with approprate fittings to the fuel line that feeds your carb or injector servo. Put a ball valve on the other end of the line.

Use your aircraft fuel pump to transfer...
Forum: Glass Cockpit 07-09-2017, 08:22 PM
Replies: 9
Views: 1,921
Posted By vlittle
I have a third-party who may do this. Send me a...

I have a third-party who may do this. Send me a PM for more info.
Thanks, Vern
Forum: Glass Cockpit 07-09-2017, 12:46 PM
Replies: 9
Views: 1,921
Posted By vlittle
More horsepower!

During the design of my Falcon-AVR controller, I converted a large assembly language program to C (about 1600 lines) and started bumping up against the real-time and memory limitations of the Arduino...
Forum: Glass Cockpit 07-06-2017, 06:48 PM
Replies: 9
Views: 1,921
Posted By vlittle
A better picture of the fully assembled and...

A better picture of the fully assembled and functional 14V version:
http://vx-aviation.com/documents/Falcon-AVR/Falcon-AVR-board.JPG

Getting there!
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