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Search: Posts Made By: BobTurner
Forum: Electronic Ignition Systems 10-26-2021, 05:18 PM
Replies: 8
Views: 543
Posted By BobTurner
Since (I gather) you still have one conventional...

Since (I gather) you still have one conventional mag, the easiest thing to do is to move the resistor pickoff to the remaining mag, presumably hooked up at the ignition switch. If you want a signal...
Forum: Electrical Systems 10-25-2021, 11:41 PM
Replies: 16
Views: 766
Posted By BobTurner
Well, of course, you’ll need multiple gauges....

Well, of course, you’ll need multiple gauges. Line to the starter #2, general avionics 18 or 16 - hugely different. Everyone’s different, you’ll get lots of opinions, so here’s mine: I avoid...
Forum: Glass Cockpit 10-25-2021, 11:28 AM
Replies: 11
Views: 574
Posted By BobTurner
Here in the US that list length is zero!

Here in the US that list length is zero!
Forum: Electrical Systems 10-24-2021, 11:34 AM
Replies: 17
Views: 1,391
Posted By BobTurner
It’s on the Odyssey web site, I think under...

It’s on the Odyssey web site, I think under ‘charging’.
Forum: Electrical Systems 10-24-2021, 12:37 AM
Replies: 17
Views: 1,391
Posted By BobTurner
Just to echo others: Odyssey says to never charge...

Just to echo others: Odyssey says to never charge their batteries at any voltage over 15 volts.
Forum: RV General Discussion/News 10-24-2021, 12:31 AM
Replies: 46
Views: 3,341
Posted By BobTurner
Thanks, fixed bad grammar. I agree: I favor the...

Thanks, fixed bad grammar.
I agree: I favor the ‘with the wind, against the wind’ method because I think it minimizes the chances of other errors (up/downdrafts, changing winds, etc) creeping...
Forum: RV General Discussion/News 10-23-2021, 07:43 PM
Replies: 46
Views: 3,341
Posted By BobTurner
Actually, you have 3 unknowns (TAS, wind speed,...

Actually, you have 3 unknowns (TAS, wind speed, wind direction) so taking data from 3 different legs is needed to get an unambiguous answer. In theory you can write equations for headings or ground...
Forum: RV General Discussion/News 10-23-2021, 07:34 PM
Replies: 25
Views: 1,632
Posted By BobTurner
The problem is, even for unsuccessful suits, the...

The problem is, even for unsuccessful suits, the previous owners/builders may be on the hook for tens of thousands of dollars for legal defense costs, even when they win. I believe after the John...
Forum: Glass Cockpit 10-23-2021, 01:55 PM
Replies: 4
Views: 204
Posted By BobTurner
Going by memory here, so I can easily be...

Going by memory here, so I can easily be wrong….
Pretty sure the G400W has a baud rate selector for the RS232 ports, somewhere in the secret, hidden set up menu.
The 400W outputs vertical steering...
Forum: RV General Discussion/News 10-23-2021, 01:31 PM
Replies: 46
Views: 3,341
Posted By BobTurner
I’m sorry, Boyd, but I’m not wrong. You can...

I’m sorry, Boyd, but I’m not wrong. You can easily verify this yourself without doing any calculations, for the case where the wind is out of the south, and you fly N, S, E, and W headings. The...
Forum: RV General Discussion/News 10-22-2021, 06:53 PM
Replies: 46
Views: 3,341
Posted By BobTurner
Just a calculated example: I used TAS=150 knots,...

Just a calculated example: I used TAS=150 knots, wind = 30 knots from 180, fly GPS ground tracks of 030, 150, 270. If everything is perfect the gps ground speeds will be 175.2, 123.3, 147.0 knots,...
Forum: RV General Discussion/News 10-21-2021, 01:26 PM
Replies: 46
Views: 3,341
Posted By BobTurner
This is bad math, and untrue. The advantage of...

This is bad math, and untrue. The advantage of three legs is that there is sufficient data to calculate both true airspeed and the speed of the wind. But a simple average is incorrect.
Forum: RV General Discussion/News 10-21-2021, 12:52 PM
Replies: 46
Views: 3,341
Posted By BobTurner
What external pressure? Pressure on top is lower...

What external pressure? Pressure on top is lower than pressure on bottom. Exactly how does air leak into the wing? You have the same issues as when using internal cabin pressure as a static source....
Forum: RV General Discussion/News 10-20-2021, 01:18 PM
Replies: 46
Views: 3,341
Posted By BobTurner
Ack! Watch out for nearly invisible guy wires....

Ack! Watch out for nearly invisible guy wires. Just remember, the higher you go, the more indicated altitude might differ from true altitude. With Fall here, you may find a day with or close to a...
Forum: RV General Discussion/News 10-19-2021, 02:41 PM
Replies: 46
Views: 3,341
Posted By BobTurner
As just discussed, this should not be repeatable....

As just discussed, this should not be repeatable. For the same gps altitude you should see different barometric altitudes, if the lapse rate/OAT varies flight to flight. As also discussed, the lower...
Forum: Glass Cockpit 10-19-2021, 02:29 PM
Replies: 14
Views: 707
Posted By BobTurner
Can you park at an airport where a vor can be...

Can you park at an airport where a vor can be received on the ground? If the needle still wags like this, it’s likely the electronics.
Forum: RV General Discussion/News 10-19-2021, 02:15 PM
Replies: 46
Views: 3,341
Posted By BobTurner
Just a further comment about barometric...

Just a further comment about barometric altimetry. When you shoot an approach into an airport at anything other than sea level, you get an altimeter setting that is not ‘barometric pressure converted...
Forum: RV General Discussion/News 10-19-2021, 02:10 PM
Replies: 46
Views: 3,341
Posted By BobTurner
One way to do Galin’s test is to land at an...

One way to do Galin’s test is to land at an airport, set the altimeter to field elevation, then take off and do a high speed pass. You might be able to use something of known height - top of a...
Forum: RV Ongoing Maintenance Issues 10-18-2021, 10:33 PM
Replies: 11
Views: 1,020
Posted By BobTurner
I’m pretty sure there’s a Vans’ SB to safety wire...

I’m pretty sure there’s a Vans’ SB to safety wire that nut.
Forum: Midwest 10-18-2021, 06:28 PM
Replies: 12
Views: 670
Posted By BobTurner
In fact, this is consistent with the ACS (nee...

In fact, this is consistent with the ACS (nee PTS), which requires a precision approach OR an LPV with minimums below 300' agl. The issue is the two required non-precision approaches. The ACS says...
Forum: RV General Discussion/News 10-15-2021, 06:53 PM
Replies: 20
Views: 2,068
Posted By BobTurner
As someone else mentioned, local scuba shops will...

As someone else mentioned, local scuba shops will often do this for a very fair price. But you might have to show up with a fitting to adapt your tank’s fitting to their’s. Are there any scuba shops...
Forum: COMM 10-13-2021, 09:43 PM
Replies: 6
Views: 254
Posted By BobTurner
Have you swapped pilot and copilot headphones, to...

Have you swapped pilot and copilot headphones, to make sure it’s not them?
Forum: Glass Cockpit 10-13-2021, 02:34 PM
Replies: 14
Views: 707
Posted By BobTurner
+1. But often it’s caused by signal reflections...

+1. But often it’s caused by signal reflections off hills. I didn’t think Wisc had any hills? But does it do this when above 5,000’ (scalloping less likely)?
Forum: RV General Discussion/News 10-13-2021, 12:50 PM
Replies: 42
Views: 4,616
Posted By BobTurner
Yes, I have heard of the faa citing a pilot for...

Yes, I have heard of the faa citing a pilot for departing, day-vfr, with a known inop beacon. That said, I believe eab operators have an ‘out’. First, note that far 91.205 specifically excludes EAB...
Forum: RV General Discussion/News 10-12-2021, 11:44 AM
Replies: 15
Views: 1,096
Posted By BobTurner
And again, a problem within the FAA. I had...

And again, a problem within the FAA. I had exactly the same experience with the ‘original’, transition training only but for hire in my plane, LODA, ten years ago. “Can’t be done, we never heard of...
Forum: RV General Discussion/News 10-11-2021, 08:17 PM
Replies: 15
Views: 1,096
Posted By BobTurner
This is getting ridiculous. Please do not believe...

This is getting ridiculous. Please do not believe everything you read here. Consult an aviation lawyer. He will tell you that once you get the new, emailed LODA, you may pay a cfi for instruction,...
Forum: RV General Discussion/News 10-11-2021, 12:11 PM
Replies: 42
Views: 4,616
Posted By BobTurner
Just to be clear, ‘anti-collision’ lights can be...

Just to be clear, ‘anti-collision’ lights can be strobes or rotating (flashing) beacons. I’ve flown 152s with a red beacon, no strobes. And a 172RG with strobes, no beacon. Whatever it is, it’s...
Forum: RV General Discussion/News 10-11-2021, 11:54 AM
Replies: 42
Views: 4,616
Posted By BobTurner
Well, be surprised. For day vfr operations of an...

Well, be surprised. For day vfr operations of an EAB no lights are required to be installed.
Forum: Glass Cockpit 10-10-2021, 11:52 PM
Replies: 5
Views: 288
Posted By BobTurner
I have a single adjustable LM317 used as an...

I have a single adjustable LM317 used as an external dimmer, with separate lines to each efis. I put a fairly sizeable resistor in the line to the brighter display, chose value by trial and error to...
Forum: RV Building Tips/Techniques 10-10-2021, 09:26 PM
Replies: 23
Views: 2,243
Posted By BobTurner
Could be you just aren’t holding the gun square...

Could be you just aren’t holding the gun square to the work. However, a common technique flaw, is relaxing the pressure on the gun handle prior to fully releasing the trigger. Try to say to yourself,...
Forum: RV General Discussion/News 10-10-2021, 08:46 PM
Replies: 15
Views: 1,096
Posted By BobTurner
Once again the FAA is less than crystal-clear....

Once again the FAA is less than crystal-clear. The above guidance was issued along with the ‘original’ LODAs, now over ten years old. This LODA - still available but not as easy to get as the ones...
Forum: COMM 10-09-2021, 06:31 PM
Replies: 12
Views: 741
Posted By BobTurner
This is called ‘strict liability’ and is NOT the...

This is called ‘strict liability’ and is NOT the law in most US states. I don’t know about Canada.
Forum: RV General Discussion/News 10-09-2021, 06:00 PM
Replies: 14
Views: 828
Posted By BobTurner
If you have the proper tools, follow...

If you have the proper tools, follow instructions, it’s not that hard.
Forum: RV General Discussion/News 10-09-2021, 12:10 AM
Replies: 15
Views: 1,096
Posted By BobTurner
Please provide a reference. I do not believe this...

Please provide a reference. I do not believe this is correct.
Forum: RV-14 10-08-2021, 08:04 PM
Replies: 3
Views: 552
Posted By BobTurner
Bad news for your former owner: In CA property...

Bad news for your former owner: In CA property tax is assessed as of Jan 1. The bills don’t go out until later, depending on the county (I get mine in Aug), but if he was the CA owner on Jan 1 he...
Forum: Safety 10-07-2021, 10:12 AM
Replies: 22
Views: 2,420
Posted By BobTurner
Just a reminder, that in 99% of US airspace,...

Just a reminder, that in 99% of US airspace, ‘clear of cloud’ is not legal. You need 2000’ clearance to do this.
Forum: GPS 10-07-2021, 10:05 AM
Replies: 17
Views: 1,247
Posted By BobTurner
I think you meant 75’. A 300’ error would put you...

I think you meant 75’. A 300’ error would put you below the ground on a lot of approaches.
Forum: GPS 10-06-2021, 09:55 PM
Replies: 18
Views: 971
Posted By BobTurner
IPad mini w/gps in a -10. Pretty much used for...

IPad mini w/gps in a -10. Pretty much used for backup. Not mounted, I pick it up to look at it. I use WingX. I wear progressive lens glasses, can read approach plates okay (but of course they’re only...
Forum: GPS 10-06-2021, 07:14 PM
Replies: 17
Views: 1,247
Posted By BobTurner
Bill's post is an interesting discussion on what...

Bill's post is an interesting discussion on what is "mean sea level", and can account for some of the errors in comparing barometric altitude to GPS altitude. But most of the time, it's just the...
Forum: GPS 10-06-2021, 11:01 AM
Replies: 17
Views: 1,247
Posted By BobTurner
Please remember that gps altitude is NOT the same...

Please remember that gps altitude is NOT the same as barometric altitude. GPS should show true MSL altitude, while barometric depends on the temperature lapse rate. Temperature higher than standard?...
Forum: RV General Discussion/News 10-05-2021, 08:12 PM
Replies: 83
Views: 14,613
Posted By BobTurner
I too find these posts interesting, to keep on...

I too find these posts interesting, to keep on top of what’s going on. That said, be careful not to generalize too much. This is very much an individual service industry, everyone’s different. Some...
Forum: Electrical Systems 10-05-2021, 01:55 PM
Replies: 28
Views: 2,195
Posted By BobTurner
There are probably as many different ways as...

There are probably as many different ways as there are builders -:) But one idea I saw was to set the standby alternator’s voltage to 13.9, while the primary is set to 14.3 volts; both connected. In...
Forum: RV-10 10-04-2021, 07:09 PM
Replies: 6
Views: 696
Posted By BobTurner
You seem to be trying to use the fuel flow...

You seem to be trying to use the fuel flow apertures to adjust the CHT. Not the right approach.
1. Do the so-called Gami test: slowly lean, and note the fuel flow when each cylinder reaches peak EGT....
Forum: RV Ongoing Maintenance Issues 10-03-2021, 06:05 PM
Replies: 7
Views: 948
Posted By BobTurner
Have to agree with Lenny here. If the buss...

Have to agree with Lenny here. If the buss voltage was close to 14 volts, the regulator and alternator were doing their job. The alternator can't "force" 55 amps to flow; that only happens if...
Forum: Safety 10-03-2021, 02:43 PM
Replies: 7
Views: 576
Posted By BobTurner
Panel location of GPS Navigator (IFR)

For some time, I've noticed a trend for builders to locate their gps navigator (GTN650, etc) low - below the nominal panel over the center tunnel. I recently flew in an RV that was layed out like...
Forum: RV-10 10-02-2021, 06:31 PM
Replies: 14
Views: 1,114
Posted By BobTurner
Have you monitored battery temperature for the...

Have you monitored battery temperature for the first 20 minutes or so after shutdown? I think that area gets hotter once all cooling air is removed, but have not made any measurements.
Forum: RV Ongoing Maintenance Issues 10-02-2021, 06:00 PM
Replies: 12
Views: 893
Posted By BobTurner
You have a "Heavy right wing", by definition....

You have a "Heavy right wing", by definition. Read thru the document in post #4.
Forum: Autopilots 10-02-2021, 09:38 AM
Replies: 9
Views: 550
Posted By BobTurner
Going from memory here…..I think the GRT will...

Going from memory here…..I think the GRT will output NMEA or Aviation format (choose in serial port setup) at 4800 or 9600 baud rate (choose in serial port setup).
Edit: For the record, from my GRT...
Forum: Safety 10-01-2021, 06:39 PM
Replies: 85
Views: 17,093
Posted By BobTurner
I guess I disagree with these statements. It is...

I guess I disagree with these statements. It is slightly worse. And you can simulate it by just pulling the mixture to cutoff. (I recommend over a suitable landing site just in case).
Forum: Autopilots 10-01-2021, 06:08 PM
Replies: 9
Views: 550
Posted By BobTurner
Since you didn't mention a "navigator", I presume...

Since you didn't mention a "navigator", I presume you have a GPS with position data (only). You should be able to send this info to the autopilot with a single RS232 link. The TruTrak will then fly...
Forum: RV General Discussion/News 09-30-2021, 09:19 PM
Replies: 26
Views: 2,432
Posted By BobTurner
And if you undercut prevailing prices, you again...

And if you undercut prevailing prices, you again hurt existing cfi’s. And if you charge more, you’ll get no business. There’s really no one right answer.
Forum: RV General Discussion/News 09-30-2021, 09:08 PM
Replies: 8
Views: 861
Posted By BobTurner
Lycoming engines use sodium filled valve stems to...

Lycoming engines use sodium filled valve stems to transfer heat the the valve guides. If this heat cokes oil in the guide, the clearance goes to zero and the valve can stick open, especially when...
Forum: RV-10 09-30-2021, 02:21 PM
Replies: 29
Views: 2,515
Posted By BobTurner
This doesn’t work, because the brakes are always...

This doesn’t work, because the brakes are always inboard. You have to take the tire off the rim, flip it, put it back together.
Forum: GPS 09-30-2021, 02:18 PM
Replies: 6
Views: 587
Posted By BobTurner
+1. This is one of those parts, that you end up...

+1. This is one of those parts, that you end up trying to put it back together wishing you had three hands.
Forum: RV General Discussion/News 09-29-2021, 09:34 PM
Replies: 16
Views: 2,061
Posted By BobTurner
IIRC some Lycoming connecting rod bolts are...

IIRC some Lycoming connecting rod bolts are tightened this way, to a designated stretch.
Forum: California 09-29-2021, 05:58 PM
Replies: 16
Views: 1,088
Posted By BobTurner
After 30 years as a cfii, here’s my 2 cents...

After 30 years as a cfii, here’s my 2 cents worth:
1. Going from steam to glass is not too difficult; going from glass to steam is harder.
A lot of ifr is preparing for problems, like equipment...
Forum: RV Building Tips/Techniques 09-29-2021, 10:28 AM
Replies: 3
Views: 662
Posted By BobTurner
+1 The goal of ‘de-burring’ is not just to remove...

+1
The goal of ‘de-burring’ is not just to remove burrs. It also puts a very slight radius on the otherwise sharp edge where stress risers live.
Forum: RV General Discussion/News 09-29-2021, 10:05 AM
Replies: 44
Views: 20,723
Posted By BobTurner
As if to second Scott’s post, I think what Bob...

As if to second Scott’s post, I think what Bob meant is to add, not the torque needed to start the bolt turning, but the torque needed to keep it turning (‘running torque’), to the final desired...
Forum: RV General Discussion/News 09-29-2021, 09:50 AM
Replies: 26
Views: 2,432
Posted By BobTurner
I think so too. Another consideration: a few...

I think so too.
Another consideration: a few years back I ferried a 182 across the US, following a sale. Enroute (with the seller) both the vacuum pump and the backup electric attitude indicator...
Forum: RV-10 09-28-2021, 12:24 PM
Replies: 6
Views: 879
Posted By BobTurner
Or is it a regional jet?

Or is it a regional jet?
Forum: California 09-28-2021, 10:11 AM
Replies: 16
Views: 1,088
Posted By BobTurner
There is currently a crazy shortage of DPE’s in...

There is currently a crazy shortage of DPE’s in Northern CA. e.g., Ashley Snyder, DPE out of Lincoln, keeps her schedule on-line. Her first opening is in February. I recommend her as being fair, but...
Forum: RV-10 09-26-2021, 05:35 PM
Replies: 5
Views: 517
Posted By BobTurner
PM is fine.

PM is fine.
Forum: RV-10 09-25-2021, 11:29 PM
Replies: 5
Views: 517
Posted By BobTurner
Want to come to LVK? I have a -10 with...

Want to come to LVK? I have a -10 with do-it-yourself paint and interior; hangar neighbor has a -10 with pro paint and interior.
Forum: COMM 09-25-2021, 11:08 AM
Replies: 7
Views: 804
Posted By BobTurner
+1 on Stein’s diagram. The goal is to have one,...

+1 on Stein’s diagram. The goal is to have one, but only one, electrical path for each connection, including grounds. Ground the shield only at the audio panel. Don’t forget to use fiber washers to...
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