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Search: Posts Made By: Alan Carroll
Forum: Safety 06-07-2018, 07:06 PM
Replies: 20
Views: 3,236
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: 20
Views: 3,236
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: 43
Views: 5,844
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: 1,671
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: 1,671
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: 1,046
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: 64
Views: 7,734
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: 64
Views: 7,734
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: 4,929
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: 3,250
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: 3,250
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: 1,030
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: 3,851
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: 4,229
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: 4,232
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: 9,195
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: 14,481
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: 14,481
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: 11
Views: 2,797
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: 41
Views: 7,720
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: 142
Views: 50,980
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: 142
Views: 50,980
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: 142
Views: 50,980
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: 12
Views: 2,884
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: 12
Views: 2,884
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: 22,917
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...
Forum: Safety 03-02-2017, 01:20 PM
Replies: 80
Views: 22,917
Posted By Alan Carroll
Someone correct me if I'm wrong but I believe...

Someone correct me if I'm wrong but I believe that lithium iron phosphate (LiFePo) is actually a type of lithium ion battery?
Forum: RV General Discussion/News 03-01-2017, 07:44 AM
Replies: 20
Views: 4,718
Posted By Alan Carroll
The tour helicopter traffic at Boulder City can...

The tour helicopter traffic at Boulder City can be pretty intense so you need to keep your eyes open near the airport. I seem to recall that they use the power station a mile or two SE of the...
Forum: RV General Discussion/News 02-23-2017, 12:43 AM
Replies: 20
Views: 4,161
Posted By Alan Carroll
Absent a magnetometer I don't think there could...

Absent a magnetometer I don't think there could be any wind indication on the EFIS? It seems that magnetic heading is required for deducing the wind correction angle, which is useful for IFR...
Forum: RV-12 02-14-2017, 11:02 AM
Replies: 87
Views: 28,670
Posted By Alan Carroll
Can't comment on the Skyview specifically but on...

Can't comment on the Skyview specifically but on my plane I have volts measured by two different instruments, and its common for them to disagree by a couple of tenths. An error of 0.4v sounds seems...
Forum: RV-12 02-14-2017, 10:04 AM
Replies: 87
Views: 28,670
Posted By Alan Carroll
I may be misreading the OP's statement; I took it...

I may be misreading the OP's statement; I took it to be saying that the battery was at 12.65 after flight (without the engine not turning). If that's the case then it doesn't appear the battery is...
Forum: RV-12 02-13-2017, 05:02 AM
Replies: 87
Views: 28,670
Posted By Alan Carroll
Not sure what battery the RV-12 uses but Odyssey...

Not sure what battery the RV-12 uses but Odyssey says in their manual the battery is good if it shows 12.65v or better open circuit (no load).
Forum: RV-12 02-13-2017, 04:57 AM
Replies: 28
Views: 6,232
Posted By Alan Carroll
I missed that, thanks.

I missed that, thanks.
Forum: RV-12 02-13-2017, 12:55 AM
Replies: 28
Views: 6,232
Posted By Alan Carroll
Dick, Its a bit unclear from your post what has...

Dick,

Its a bit unclear from your post what has actually failed on your airplane?

Its worth noting is that modern engine monitoring systems can sometimes induce anxiety simply because they...
Forum: RV General Discussion/News 02-10-2017, 02:56 AM
Replies: 51
Views: 12,115
Posted By Alan Carroll
HI Larry, If you were previously getting a...

HI Larry,

If you were previously getting a smaller error with the same static port, it doesn't seem very likely that the static port is the problem. You can try to tweak the local pressures at the...
Forum: RV General Discussion/News 02-08-2017, 12:48 AM
Replies: 43
Views: 8,979
Posted By Alan Carroll
+1 for DJ Lauritsen at Cleveland Aircraft Tool...

+1 for DJ Lauritsen at Cleveland Aircraft Tool (https://bracketsweb.com/rvinteriors). DJ did my seats over 10 years ago; they are very comfortable for long flights. It was very easy to customize...
Forum: Electronic Ignition Systems 02-04-2017, 07:08 AM
Replies: 12
Views: 2,884
Posted By Alan Carroll
That seems like a reasonable way to deal with the...

That seems like a reasonable way to deal with the problem. Presumably you also have a way to check the backup battery voltage during preflight to make sure it actually has a charge? (the fusible...
Forum: Electronic Ignition Systems 02-04-2017, 02:33 AM
Replies: 12
Views: 2,884
Posted By Alan Carroll
Larry, I asked Kathy at EarthX about this and...

Larry,

I asked Kathy at EarthX about this and she pointed out that their batteries are limited in maximum allowable charging current. For the ETX12A for example this limit is 20 amps. I noted that...
Forum: RV General Discussion/News 02-03-2017, 08:01 AM
Replies: 19
Views: 4,516
Posted By Alan Carroll
The full report can be found online here...

The full report can be found online here (http://pubs.rsc.org/en/content/articlehtml/2013/ra/c3ra45748f). The red curves ("LFP") are for LiFePO4. The authors found that they began to go generate...
Forum: RV General Discussion/News 02-03-2017, 05:24 AM
Replies: 19
Views: 4,516
Posted By Alan Carroll
It dawned on me as well that a battery box that...

It dawned on me as well that a battery box that melts might be a good thing if it allows the burning mess to simply depart the airplane. Hopefully it doesn't fall on someone (FAR 91.15 comes to...
Forum: RV General Discussion/News 02-03-2017, 12:55 AM
Replies: 19
Views: 4,516
Posted By Alan Carroll
As it happens someone has done a study...

As it happens someone has done a study (http://www.sciencedirect.com/science/article/pii/S0950423016304715) of this recently. You have to pay if you want the full article but I was able to access it...
Forum: Electronic Ignition Systems 01-22-2017, 03:18 PM
Replies: 17
Views: 3,953
Posted By Alan Carroll
Thinking about this some more, the Lightspeeds...

Thinking about this some more, the Lightspeeds could provide a ground path for the starter if the timing modules are grounded to the engine. I'm guessing that the shields for the sensor wire...
Forum: Electronic Ignition Systems 01-22-2017, 02:04 PM
Replies: 17
Views: 3,953
Posted By Alan Carroll
Hi Mickey, I see your point, but the ground wire...

Hi Mickey,

I see your point, but the ground wire for the Lightspeed that apparently overheated is connected directly to the battery. Unless I'm missing something its not able to serve as an...
Forum: Electronic Ignition Systems 01-22-2017, 01:44 PM
Replies: 17
Views: 3,953
Posted By Alan Carroll
David, If you go to the Lightspeed Engineering...

David,

If you go to the Lightspeed Engineering site you'll find the the installation manual (http://lightspeed-aero.com/Manuals/Plasma_CdiManual_20130317.pdf), which might help in figuring out...
Forum: Electronic Ignition Systems 01-22-2017, 01:17 PM
Replies: 17
Views: 3,953
Posted By Alan Carroll
Don't I know it! It gets easier with practice...

Don't I know it! It gets easier with practice though, and really is more tedious than difficult. I've had mine off several times in the last ten years and always take advantage of the opportunity to...
Forum: Electronic Ignition Systems 01-22-2017, 11:59 AM
Replies: 17
Views: 3,953
Posted By Alan Carroll
Bill, That one surprised me as well. As I...

Bill,

That one surprised me as well. As I recall the post all the timing wires from the Hall effect sensor board were routed together. The newer Lightspeed sensor modules are separate, which makes...
Forum: Electronic Ignition Systems 01-22-2017, 11:05 AM
Replies: 17
Views: 3,953
Posted By Alan Carroll
David, I'm not sure I understand why a bad...

David,

I'm not sure I understand why a bad battery ground would have any effect on the Lightspeeds, if they're installed according to the manual? As you note the power and ground are both directly...
Forum: RV General Discussion/News 01-18-2017, 01:56 AM
Replies: 77
Views: 21,755
Posted By Alan Carroll
One other tip, it will be easier to do this job...

One other tip, it will be easier to do this job if you can prop up the tail to level the fuselage. I made a tail-stand out of scrap wood that serves nicely.
Forum: RV-14 01-18-2017, 01:48 AM
Replies: 17
Views: 6,555
Posted By Alan Carroll
I think there's two parts to this problem, the...

I think there's two parts to this problem, the desire to have the latest wizardry and obsolescence of components. The first part is completely under your control, but the second is not. Seems like...
Forum: RV General Discussion/News 01-17-2017, 02:14 AM
Replies: 77
Views: 21,755
Posted By Alan Carroll
In addition to Van's builder's manual another...

In addition to Van's builder's manual another good reference to keep on hand is AC 43.13-2B...
Forum: RV-4 01-06-2017, 06:26 PM
Replies: 10
Views: 4,667
Posted By Alan Carroll
I installed an Ellison on my RV-8 some years ago....

I installed an Ellison on my RV-8 some years ago. I would not say it was a particularly difficult installation, but it wasn't "plug and play" either. It required a custom spacer to keep the airbox...
Forum: RV General Discussion/News 12-26-2016, 09:57 AM
Replies: 26
Views: 8,891
Posted By Alan Carroll
True, but I wonder how much this affects speed? ...

True, but I wonder how much this affects speed? The paint weight shifts CG aft, which might actually cause an increase in airspeed?
Forum: RV General Discussion/News 12-12-2016, 05:57 PM
Replies: 26
Views: 8,891
Posted By Alan Carroll
The CAFE Foundation actually tested the effects...

The CAFE Foundation actually tested the effects of waxing on speed of a Mooney some years ago (see Wax Job (http://cafe.foundation/v2/pdf_cafe_reports/Wax%20Job%20with%20PICT.pdf)). They found a...
Forum: Traditional Aircraft Engines 12-12-2016, 04:21 PM
Replies: 32
Views: 12,601
Posted By Alan Carroll
Started with a Lightspeed Plasma II (crank...

Started with a Lightspeed Plasma II (crank trigger) and a Slick mag. Mag started having problems around 800 hours, Lightspeed has been trouble free for over 1000 hours.
Forum: RV General Discussion/News 12-11-2016, 12:07 PM
Replies: 22
Views: 6,166
Posted By Alan Carroll
The safest solution would be to avoid jacking the...

The safest solution would be to avoid jacking the wing at all, and jack up the end of the gear leg instead. The problem is the lack of an obvious way to do this on an RV-8. Has anyone found a good...
Forum: RV-8/8A 12-07-2016, 07:26 AM
Replies: 10
Views: 3,746
Posted By Alan Carroll
Its been quite a while since I did this, but I...

Its been quite a while since I did this, but I recall taking advantage of the slight flex in the fiberglass tighten up the fit. Basically you can build in a bit of extra curvature that snugs up...
Forum: RV General Discussion/News 11-19-2016, 06:32 AM
Replies: 11
Views: 3,583
Posted By Alan Carroll
Now I get it. I'd guess that since the...

Now I get it. I'd guess that since the magnetometer doesn't have a moving magnet its lets sensitive to position-based errors during calibration (for example tail up vs. down).
Forum: RV General Discussion/News 11-18-2016, 08:07 PM
Replies: 11
Views: 3,583
Posted By Alan Carroll
That makes sense, at least in places where roads...

That makes sense, at least in places where roads are laid out on a grid. You could measure the road orientation on a topographic map to be sure.
Forum: RV General Discussion/News 11-18-2016, 07:46 PM
Replies: 11
Views: 3,583
Posted By Alan Carroll
Mark - just curious, how do you determine the...

Mark - just curious, how do you determine the heading without a calibrated compass?
Forum: RV Photo/Video URLs 10-24-2016, 10:42 AM
Replies: 41
Views: 8,393
Posted By Alan Carroll
Visitors

I can find things to agree with on both sides of this debate I think. I struggled with a similar question myself recently while shooting air-to-ground video of geysers in Yellowstone, that I wanted...
Forum: RV General Discussion/News 10-13-2016, 07:21 AM
Replies: 16
Views: 2,964
Posted By Alan Carroll
This is a great trip that can be a lot of fun. ...

This is a great trip that can be a lot of fun. As others have said, go the southern route for better weather. Lots of geologic points of interest along the way; my favorites are Winslow meteor...
Forum: Glass Cockpit 10-11-2016, 09:30 AM
Replies: 8
Views: 2,029
Posted By Alan Carroll
I wrote that review about 5 years ago; since then...

I wrote that review about 5 years ago; since then my EFIS has been flawless. I continue to think that Trutrak didn't market this unit very effectively; their MO seems to be build a great product and...
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