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Search: Posts Made By: Alan Carroll
Forum: Electronic Ignition Systems 09-13-2020, 04:17 PM
Replies: 25
Views: 3,066
Posted By Alan Carroll
I have a Lightspeed box mounted there as well;...

I have a Lightspeed box mounted there as well; been thinking about adding a shield to prevent contact with baggage...
Forum: Electronic Ignition Systems 09-12-2020, 09:33 AM
Replies: 25
Views: 3,066
Posted By Alan Carroll
Matt, Glad you found the problem. Out of...

Matt,

Glad you found the problem. Out of curiosity, what wire was disconnected?
Forum: RV General Discussion/News 08-02-2020, 03:11 PM
Replies: 26
Views: 6,203
Posted By Alan Carroll
Good point!

Good point!
Forum: RV General Discussion/News 08-02-2020, 12:15 PM
Replies: 26
Views: 6,203
Posted By Alan Carroll
IAS is adding an unnecessary complication to this...

IAS is adding an unnecessary complication to this discussion - the OP is talking about TAS.

TAS at WOT decreases with altitude, assuming a normally aspirated engine. Fuel burn (at a constant...
Forum: RV General Discussion/News 08-02-2020, 07:53 AM
Replies: 26
Views: 6,203
Posted By Alan Carroll
See reply #6. More air for the engine down low,...

See reply #6. More air for the engine down low, less as you go higher. During cross-country races in the RV-8 I plan on losing 1 kt TAS per 1000'.
Forum: GPS 05-06-2020, 09:18 AM
Replies: 19
Views: 4,502
Posted By Alan Carroll
I tried out both 740B and a 5th generation iPad...

I tried out both 740B and a 5th generation iPad Mini side by side. The 740B generally worked well. The screen does require a firm touch, a good thing in turbulence. 740B also has lots of ports and...
Forum: RV-14 04-24-2020, 08:41 AM
Replies: 39
Views: 5,511
Posted By Alan Carroll
Tim - 7 knots too fast, or too slow? FWIW I used...

Tim - 7 knots too fast, or too slow?

FWIW I used flush ports on my my RV-8 and got a different finding. I did extensive testing at 5 kt increments using 4 way GPS stabilized groundspeeds. The temp...
Forum: RV-14 04-22-2020, 08:54 AM
Replies: 39
Views: 5,511
Posted By Alan Carroll
Regarding accuracy of various static ports, this...

Regarding accuracy of various static ports, this is a more complicated issue than some may realize. The CAFE Foundation tested the RV-9A factory ship and published the table below (full report is...
Forum: Safety 04-09-2020, 07:32 AM
Replies: 48
Views: 7,747
Posted By Alan Carroll
After having this problem occur while on a trip I...

After having this problem occur while on a trip I carry a spare pin in my traveling kit, along with a small file.

Regarding crosswind capability, this topic has come up in several previous threads...
Forum: RV General Discussion/News 02-25-2020, 07:35 AM
Replies: 24
Views: 2,308
Posted By Alan Carroll
A lot of the conventional wisdom on this topic...

A lot of the conventional wisdom on this topic seems to rely on speculation rather than actual data. Here's an...
Forum: RV General Discussion/News 02-24-2020, 08:02 PM
Replies: 24
Views: 2,308
Posted By Alan Carroll
I've never understood why cylinder band heaters...

I've never understood why cylinder band heaters should cause corrosion inside a cylinder. Surely if the cylinder wall gets hot enough to boil off the oil (>500?F) they will also boil off any water? ...
Forum: ADS-B 06-09-2019, 09:12 AM
Replies: 20
Views: 5,323
Posted By Alan Carroll
I recently switched from many years of XM to...

I recently switched from many years of XM to FIS-B on a portable device. I liked XM a lot, particularly in the early years when it seemed almost magical. It wasn't perfect however; for example it...
Forum: ADS-B 05-04-2019, 03:13 PM
Replies: 13
Views: 3,654
Posted By Alan Carroll
Or maybe different ATC facilities have different...

Or maybe different ATC facilities have different timetables for adopting the new technology?
Forum: Electrical Systems 04-30-2019, 04:19 PM
Replies: 3
Views: 972
Posted By Alan Carroll
I think ideally every wire is supposed to be 3...

I think ideally every wire is supposed to be 3 feet away from every other wire (or something like that :)). Good luck making it happen in the -8! I ran antenna leads together with strobe power,...
Forum: RV-8/8A 04-07-2019, 11:26 AM
Replies: 45
Views: 14,000
Posted By Alan Carroll
I think they're quoting in New Zealand dollars? ...

I think they're quoting in New Zealand dollars? (1 NZD=0.67 USD)
Forum: Safety 03-25-2019, 06:52 AM
Replies: 91
Views: 12,698
Posted By Alan Carroll
Not sure if its already been mentioned, but wide...

Not sure if its already been mentioned, but wide runways create a visual illusion of being lower than you actually are (described here for example: http://www.flytime.ca/runway-illusions). This can...
Forum: ADS-B 03-19-2019, 07:08 AM
Replies: 244
Views: 45,454
Posted By Alan Carroll
That seems right, with the operative phrase being...

That seems right, with the operative phrase being "for now."

Crowd-sourced 978 monitoring in the future would perhaps not matter, unless the initial identification that is broadcast at startup...
Forum: ADS-B 03-18-2019, 05:47 PM
Replies: 244
Views: 45,454
Posted By Alan Carroll
FlightAware already has coverage down to the...

FlightAware already has coverage down to the ground at my home base, a small uncontrolled field, apparently through the PiAware network. This seems to be limited to 1090 for now, but looks like 978...
Forum: Safety 03-11-2019, 07:20 AM
Replies: 17
Views: 4,088
Posted By Alan Carroll
"Open water"

+1 on Sam's comment.

I also learned something new from the video - "open water" for purposes of 91.119(c) is depicted by a (very slightly) lighter shade of blue on sectionals, differentiating it...
Forum: RV General Discussion/News 03-07-2019, 07:01 AM
Replies: 48
Views: 8,249
Posted By Alan Carroll
I'm not worried at all about Foreflight; the EFB...

I'm not worried at all about Foreflight; the EFB market has become very competitive and there are plenty of good alternatives. I've had FF for years but I'm not sure its head and shoulders above the...
Forum: ADS-B 02-26-2019, 06:39 PM
Replies: 244
Views: 45,454
Posted By Alan Carroll
This is really useful information, thanks for...

This is really useful information, thanks for posting it!

One question, it appears in the last screenshot that you were still transmitting your real hex code (ac94ef) while at 2500 ft? It appears...
Forum: RV-7/7A 02-24-2019, 04:49 PM
Replies: 52
Views: 7,996
Posted By Alan Carroll
Sure sounds like you have a problem between the...

Sure sounds like you have a problem between the main bus and the endurance bus - either a connection gone bad or the avionics/endurance bus switch itself.

The alternator could be a red herring. You...
Forum: RV-7/7A 02-24-2019, 06:34 AM
Replies: 52
Views: 7,996
Posted By Alan Carroll
If there is an avionics master switch I would try...

If there is an avionics master switch I would try bypassing it and see that gets power back to avionics. (could be the builder put the fuel pump on the same bus with the idea that it is an essential...
Forum: ADS-B 02-20-2019, 06:16 PM
Replies: 244
Views: 45,454
Posted By Alan Carroll
You're right, something doesn't add up. 90...

You're right, something doesn't add up. 90 seconds after power-up would allow enough time for GPS satellite acquisition, but normally not enough to get airborne.
Forum: ADS-B 02-20-2019, 05:12 PM
Replies: 244
Views: 45,454
Posted By Alan Carroll
Also repeated in July...

Also repeated in July 2018:
https://www.freeflightsystems.com/blog/2018/07/10/ads-b-and-privacy-not-all-datalinks-are-created-equal/1090/
Forum: ADS-B 02-19-2019, 07:28 AM
Replies: 244
Views: 45,454
Posted By Alan Carroll
Jim, Thanks for the additional information,...

Jim,

Thanks for the additional information, this is very helpful. Its also not very encouraging that even some of Garmin's own staff are confused about this issue!

AC-165B has more to say...
Forum: ADS-B 02-18-2019, 07:43 AM
Replies: 244
Views: 45,454
Posted By Alan Carroll
The potential for personal data to be used for...

The potential for personal data to be used for questionable purposes without the consent of its owners has been well publicized, and is a growing source of concern for many. It doesn?t seem...
Forum: ADS-B 02-17-2019, 07:28 AM
Replies: 244
Views: 45,454
Posted By Alan Carroll
From FreeFlight Systems' web site: "How does 978...

From FreeFlight Systems' web site:

"How does 978 UAT do it differently? The 978 UAT rules allow for an ?anonymous? operating mode for aircraft flying VFR, and most avionics manufactures? equipment...
Forum: RV-10 02-14-2019, 06:26 AM
Replies: 18
Views: 1,993
Posted By Alan Carroll
I did some experimenting with this years ago in...

I did some experimenting with this years ago in the RV-8. In theory it should work, but I could not measure an improvement.
Forum: RV-10 02-13-2019, 06:59 AM
Replies: 18
Views: 1,993
Posted By Alan Carroll
Push the throttle and prop controls all the way...

Push the throttle and prop controls all the way forward! This might seem obvious, but based on Airventure Cup results over the years I suspect there were a few pilots who were not really racing. ...
Forum: ADS-B 02-11-2019, 07:36 AM
Replies: 12
Views: 4,518
Posted By Alan Carroll
+1 for Stark. I just bought a Stratus ESG from...

+1 for Stark. I just bought a Stratus ESG from him; price was right and he was very responsive.

One potentially annoying detail about the Stratus is that its rack width is just a bit larger than...
Forum: ADS-B 12-26-2018, 09:51 AM
Replies: 5
Views: 3,738
Posted By Alan Carroll
Actually according to the uAvionix news release...

Actually according to the uAvionix news release the same Power Transcoder technology is also used in the echoUAT: ...
Forum: ADS-B 12-26-2018, 08:34 AM
Replies: 5
Views: 3,738
Posted By Alan Carroll
uAvionix granted patent

A potentially encouraging development: https://www.aopa.org/news-and-media/all-news/2018/december/06/uavionix-transcoder-patent-approved

I'm not a lawyer but this would seem to make it more...
Forum: RV General Discussion/News 10-08-2018, 03:58 PM
Replies: 12
AOG
Views: 1,885
Posted By Alan Carroll
From the Ellison troubleshooting guide: "Engine...

From the Ellison troubleshooting guide:

"Engine dies when throttle is slowly opened from idle: Induction air leak between TBI and cylinders."
Forum: RV General Discussion/News 10-04-2018, 07:10 AM
Replies: 27
Views: 5,602
Posted By Alan Carroll
Its not Class E, its a narrow strip of Class G...

Its not Class E, its a narrow strip of Class G that lies outside the boundaries of two Class E areas. Why they didn't just merge the two areas I couldn't say. An artifact of how the chart was made...
Forum: Traditional Aircraft Engines 09-09-2018, 08:21 AM
Replies: 19
Views: 3,781
Posted By Alan Carroll
I've got dual Lightspeeds and if I turn one off...

I've got dual Lightspeeds and if I turn one off in flight there are no popping noises. I agree with Carl's suggestion, you should check out the Lightspeed more carefully. Could be the the mag has...
Forum: Rocket 09-01-2018, 01:36 PM
Replies: 30
Views: 10,677
Posted By Alan Carroll
Interesting comparison, thanks. I'm curious,...

Interesting comparison, thanks. I'm curious, what are the altitudes for these numbers?

I don't have anything to compare to the Rocket, but my RV-8 does more like 188 KTAS down low and wide open on...
Forum: Rocket 09-01-2018, 08:51 AM
Replies: 30
Views: 10,677
Posted By Alan Carroll
SARL race speeds

Rockets are clearly faster than RV-8s, but its difficult to get a realistic idea how much faster based solely on anecdotal reports. About 7 years ago I used race data compiled by Bob Axsom over a...
Forum: Safety 06-07-2018, 07:06 PM
Replies: 15
Views: 5,817
Posted By Alan Carroll
Thanks Vac! If I'm following this correctly, the...

Thanks Vac!

If I'm following this correctly, the vertical component of thrust from the prop decreases the amount of required lift from the wing by same amount (level, 1G flight), so you can fly...
Forum: Safety 06-06-2018, 07:34 AM
Replies: 15
Views: 5,817
Posted By Alan Carroll
A related question for the aeronautical...

A related question for the aeronautical engineers: what about the effects of engine power on stall speed? As I understand it Vs and Vso are both reported at idle power. Power-on stall speeds are...
Forum: RV General Discussion/News 05-17-2018, 07:03 AM
Replies: 77
Views: 15,349
Posted By Alan Carroll
I don't have synthetic vision installed, but this...

I don't have synthetic vision installed, but this case raises an interesting question: would you have even made this flight without SV?
Forum: RV Ongoing Maintenance Issues 05-05-2018, 01:59 PM
Replies: 19
Views: 3,063
Posted By Alan Carroll
Oops, didn't realize you had the hall-effect...

Oops, didn't realize you had the hall-effect sensor. These do seem to cause more than their share of problems (a friend had one fail completely). I've got a crank sensor, which has the advantage of...
Forum: RV Ongoing Maintenance Issues 05-05-2018, 12:11 PM
Replies: 19
Views: 3,063
Posted By Alan Carroll
I have no position regarding which ignition is...

I have no position regarding which ignition is best.

However it sounds like your Lightspeed may be installed incorrectly? There should not be an extra D-sub connector installed at the firewall. ...
Forum: Safety 04-01-2018, 08:31 AM
Replies: 8
Views: 1,638
Posted By Alan Carroll
ADS-B(ird)

As common as drones have become, there are still vastly more birds flying close to the ground, particularly in sparsely-populated areas associated with wetlands. A lot of them are bigger than drones...
Forum: RV Building Tips/Techniques 01-10-2018, 07:00 AM
Replies: 62
Views: 14,533
Posted By Alan Carroll
Interesting point. It doesn't seem like this...

Interesting point. It doesn't seem like this should make a difference in terms of material strength though? It probably would affect the direction of crack propagation.

I do know there has been...
Forum: RV Building Tips/Techniques 01-08-2018, 06:36 PM
Replies: 62
Views: 14,533
Posted By Alan Carroll
Chris, Interesting calculation! Any idea what...

Chris,

Interesting calculation!

Any idea what the shear strength of the aluminum rivets might be? Perhaps they would fail before the canopy? I did an experiment on this long ago while I was...
Forum: Safety 01-06-2018, 04:42 PM
Replies: 36
Views: 6,503
Posted By Alan Carroll
Is the apparent difference between 6s and 7s...

Is the apparent difference between 6s and 7s really statistically significant? The actual numbers are small. If I flip a coin I might get heads 7 times on the first 10 flips, and only twice on the...
Forum: RV Ongoing Maintenance Issues 12-13-2017, 07:22 PM
Replies: 22
Views: 5,329
Posted By Alan Carroll
My understanding is that the bolt in question is...

My understanding is that the bolt in question is the one that captures the end of the flap motor. There's no bearing there, just a hole in the motor casing that will tend to rotate the bolt. Hence...
Forum: RV Ongoing Maintenance Issues 12-13-2017, 04:49 PM
Replies: 22
Views: 5,329
Posted By Alan Carroll
Hi Dave, Glad this didn't end up causing...

Hi Dave,

Glad this didn't end up causing trouble. I need to check my plans but I'm pretty sure this bolt should have a castle nut and cotter pin rather than a nylock.
Forum: Traditional Aircraft Engines 09-04-2017, 05:49 PM
Replies: 7
Views: 1,718
Posted By Alan Carroll
Dan Horton posted an excellent schematic diagram...

Dan Horton posted an excellent schematic diagram and explanation of how the oil flow path, that may be found...
Forum: RV General Discussion/News 09-01-2017, 06:21 PM
Replies: 22
Views: 5,052
Posted By Alan Carroll
If you haven't done it before its fun to watch...

If you haven't done it before its fun to watch the short takeoff and landing contest at the at the Super Cub fly-in at New Holstein, that takes place each year during Airventure. The typical...
Forum: RV-8/8A 08-29-2017, 01:07 PM
Replies: 21
Views: 6,950
Posted By Alan Carroll
Another unrelated consideration is...

Another unrelated consideration is serviceability. I've had to replace two cables on my RV-8 so far, and with the 3-lever quadrant it's a real pain to do (there's a lot crammed into a small area). ...
Forum: Safety 05-31-2017, 08:14 AM
Replies: 23
Views: 5,432
Posted By Alan Carroll
As already noted the comparison between the...

As already noted the comparison between the highway and general aviation data is somewhat problematic for a variety reasons. I would further argue that neither the "per mile" or "per hour"...
Forum: Electronic Ignition Systems 05-22-2017, 11:49 AM
Replies: 42
Views: 11,831
Posted By Alan Carroll
Hi Carl, Looking at the Lightspeed diagram...

Hi Carl,

Looking at the Lightspeed diagram (http://lightspeed-aero.com/Manuals/PS_Diagram.htm) I'm not quite sure I understand the problem. It would appear that you can in fact check the Aux...
Forum: Glass Cockpit 04-11-2017, 10:39 AM
Replies: 94
Views: 22,429
Posted By Alan Carroll
Good point, and a good example perhaps of...

Good point, and a good example perhaps of unanticipated consequences of a design change.
Forum: Glass Cockpit 04-11-2017, 12:23 AM
Replies: 94
Views: 22,429
Posted By Alan Carroll
I hadn't thought about it before but this may be...

I hadn't thought about it before but this may be part of the reason that Lightspeed specifies that their ignitions be connected directly to the battery terminals.

Glad you weren't flying in IMC...
Forum: RV-8/8A 04-04-2017, 12:30 AM
Replies: 20
Views: 8,452
Posted By Alan Carroll
Robin, If you're concerned about this you might...

Robin,

If you're concerned about this you might try weighing with a different set of scales. This would be a lot more meaningful than trying to compare to other planes.

My experience is that...
Forum: RV General Discussion/News 03-30-2017, 02:59 AM
Replies: 43
Views: 15,334
Posted By Alan Carroll
Or not. I believe Part 25 only applies to...

Or not. I believe Part 25 only applies to transport category airplanes. There's also 91.205, but this applies only to aircraft with a standard category airworthiness certificate. As near I can tell...
Forum: RV-8/8A 03-21-2017, 11:22 AM
Replies: 157
Views: 73,307
Posted By Alan Carroll
David, Just for fun here's a couple more vintage...

David,

Just for fun here's a couple more vintage videos from WWII:

https://www.youtube.com/watch?v=duyMuyA69yg Very nice 3-point landing by a P-51

https://www.youtube.com/watch?v=Vi9i6k5NBTY ...
Forum: RV-8/8A 03-21-2017, 01:47 AM
Replies: 157
Views: 73,307
Posted By Alan Carroll
True, except for the P47 which was a War Dept....

True, except for the P47 which was a War Dept. training film. Not so much Youtube in 1944 :)



Yes, in fact I own two copies and consider it an aviation classic. I also got my instrument rating...
Forum: RV-8/8A 03-20-2017, 12:17 PM
Replies: 157
Views: 73,307
Posted By Alan Carroll
After about >1000 hours in the RV-8 I don't have...

After about >1000 hours in the RV-8 I don't have a strong opinion in the "which way of landing is better" debate (I routinely do both depending on conditions and the whim of the moment), but its...
Forum: Electronic Ignition Systems 03-05-2017, 01:56 AM
Replies: 35
Views: 7,459
Posted By Alan Carroll
Dan, I had missed this; thanks for posting. The...

Dan,

I had missed this; thanks for posting. The graphs are indeed a bit cryptic because of the unexplained time axis.

It would be really interesting to see someone do side-by-side testing of...
Forum: Electronic Ignition Systems 03-05-2017, 01:00 AM
Replies: 35
Views: 7,459
Posted By Alan Carroll
Very nice (and the price is certainly right!)

Very nice (and the price is certainly right!)
Forum: Safety 03-04-2017, 10:52 AM
Replies: 80
Views: 26,937
Posted By Alan Carroll
Unfortunately I think the reality is a lot more...

Unfortunately I think the reality is a lot more complicated than this, and the terminology can certainly be confusing. Here's what I've pieced together so far (note: I could be wrong so please take...
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