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Search: Posts Made By: DanH
Forum: Electronic Ignition Systems Today, 07:31 AM
Replies: 51
Views: 2,735
Posted By DanH
I have a question. Assume no battery power being...

I have a question.

Assume no battery power being supplied to either 114 series unit (no power at terminal 5). Assume terminal 4 (the "p-lead") is open (ignition ON). Further assume RPM drops to...
Forum: RV-14 Today, 06:35 AM
Replies: 4
Views: 348
Posted By DanH
Just remember it is rarely updated, thus some of...

Just remember it is rarely updated, thus some of the data found therein is wrong.

Few users read the very first line on AC43’s signature page. It says (emphasis mine):

This advisory circular (AC)...
Forum: Electronic Ignition Systems Yesterday, 11:53 AM
Replies: 51
Views: 2,735
Posted By DanH
Given this is the year 2020, why should an...

Given this is the year 2020, why should an on-engine device have a temp sticker?
Forum: RV-9/9A Yesterday, 11:49 AM
Replies: 71
Views: 5,421
Posted By DanH
Yeah, Twitter has that problem all the time ;)

Yeah, Twitter has that problem all the time ;)
Forum: RV Ongoing Maintenance Issues 05-28-2020, 02:43 PM
Replies: 22
Views: 1,597
Posted By DanH
The polysulfide sealant specification includes a...

The polysulfide sealant specification includes a basic minimum test elongation of 200%. The standard is as low as 75% when tested in adverse conditions.

Let's use 200%, and assume a no-joggle...
Forum: RV Ongoing Maintenance Issues 05-28-2020, 09:57 AM
Replies: 22
Views: 1,597
Posted By DanH
Can't speak for consensus, but the statistics are...

Can't speak for consensus, but the statistics are clear. Paint blisters over tank rivets has nothing to do with MEK application. Nor is it strictly a QB tank problem.

Jim, roughly speaking, when...
Forum: Traditional Aircraft Engines 05-27-2020, 03:19 PM
Replies: 3
Views: 225
Posted By DanH
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=45548&highlight=schematic
Forum: RV-7/7A 05-27-2020, 10:56 AM
Replies: 18
Views: 1,010
Posted By DanH
The key questions are inlet diameter, and long or...

The key questions are inlet diameter, and long or short cowl.
Forum: ADS-B 05-25-2020, 10:05 AM
Replies: 8
Views: 262
Posted By DanH
Me too. From a previous thread...a record of the...

Me too.

From a previous thread...a record of the transmitted output at initial power up while operating on the original software. Lines 3 thru 6 are my true ICAO code and N#, after which the system...
Forum: RV General Discussion/News 05-24-2020, 06:05 AM
Replies: 26
Views: 1,439
Posted By DanH
So hook up a manometer and make two flights. The...

So hook up a manometer and make two flights. The loss isn't huge, but it's there. Bobby Looper told us an ECI R&D project established a deltaP loss of about 1" H2O for each 1 sq in of leak area. ...
Forum: RV General Discussion/News 05-23-2020, 06:19 AM
Replies: 26
Views: 1,439
Posted By DanH
+1. Also threw away the vacuum pump, the ADF, my...

+1.

Also threw away the vacuum pump, the ADF, my whiz wheel, and my scarf and goggles ;)
Forum: RV General Discussion/News 05-22-2020, 10:58 AM
Replies: 26
Views: 1,439
Posted By DanH
Two flights with some piccolo tubes would answer...

Two flights with some piccolo tubes would answer the question.
Forum: RV General Discussion/News 05-21-2020, 11:26 AM
Replies: 16
Views: 1,399
Posted By DanH
Offhand, I don't know. Right now I'd be in the...

Offhand, I don't know. Right now I'd be in the boat with you, checking around.
Forum: RV General Discussion/News 05-21-2020, 10:20 AM
Replies: 16
Views: 1,399
Posted By DanH
Aircraft Specialties Services,...

Aircraft Specialties Services, recommended.

Divco? Ahhhh, well...not so much.
Forum: Electrical Systems 05-20-2020, 09:27 AM
Replies: 3
Views: 218
Posted By DanH
ECU and pump on an always-hot battery bus,...

ECU and pump on an always-hot battery bus, connected at the battery end of the alternator B-lead ANL.
Forum: RV-14 05-19-2020, 08:07 AM
Replies: 38
Views: 2,878
Posted By DanH
I don't recall ever owning a nosewheel. That...

I don't recall ever owning a nosewheel. That said, the lucky among us get older, and slower. Although I find the tailwheel 14 to be a pussycat, and I adore Marvin's "big wheel" 14, I would probably...
Forum: RV General Discussion/News 05-19-2020, 07:47 AM
Replies: 30
Views: 3,703
Posted By DanH
I can't help being amused, as I recall being...

I can't help being amused, as I recall being advised, right here on VAF, that a 390 was not a good choice for an RV-8.

In some ways the 390A is not a good choice. It is heavy, pushing the CG...
Forum: RV General Discussion/News 05-18-2020, 01:57 PM
Replies: 21
Views: 2,051
Posted By DanH
Nothing wrong with proseal, but Loctite 598, aka...

Nothing wrong with proseal, but Loctite 598, aka Permatex Ultra Black (very high oil resistance), would be faster/easier.

That said, a finish-painted cowl needs nothing for insulation edge sealing...
Forum: Electrical Systems 05-18-2020, 09:22 AM
Replies: 26
Views: 1,306
Posted By DanH
No, that's power TO the MAP sensor. Backup...

No, that's power TO the MAP sensor. Backup battery and main bus feed both the EIS and the MAP sensor via the diodes.



Yes, the diodes here for the EIS, as well as internal diodes in the GRT EFIS...
Forum: RV General Discussion/News 05-18-2020, 07:21 AM
Replies: 4
Views: 539
Posted By DanH
Easy to get confused with ignition clocking. ...

Easy to get confused with ignition clocking. Most EI's are installed and timed using TDC as the reference. "Clocking" (to reduce CHT, or add detonation margin, or ignite ATDC at cranking speed)...
Forum: Electrical Systems 05-16-2020, 06:53 PM
Replies: 26
Views: 1,306
Posted By DanH
Easy way to improve avionics master switch life...

Easy way to improve avionics master switch life is to reduce load. See what you might move to the main bus. Leave low draw things on the avionics bus; radio, xponder, etc. Nothing motor...
Forum: Electrical Systems 05-16-2020, 02:58 PM
Replies: 26
Views: 1,306
Posted By DanH
Yeah, Bob has declared them unnecessary for some...

Yeah, Bob has declared them unnecessary for some time. That said, we either figure out how to turn all the avionics on and off as a group, or do them all individually.

Per Bob's "failure...
Forum: RV-14 05-16-2020, 05:30 AM
Replies: 4
Views: 533
Posted By DanH
Wait until you install the engine and exhaust.

Wait until you install the engine and exhaust.
Forum: RV General Discussion/News 05-16-2020, 05:19 AM
Replies: 21
Views: 2,051
Posted By DanH
Be careful about the surface finish under tapes...

Be careful about the surface finish under tapes and heat barriers. As a general rule, a hard, high gloss paint is best for maximum adhesion of all the self-stick materials.

Some time back our own...
Forum: Electrical Systems 05-15-2020, 09:14 AM
Replies: 26
Views: 1,306
Posted By DanH
For VFR, me too. What started as an essential...

For VFR, me too.

What started as an essential bus, a tool for rapid load shedding, became an endurance bus after folks decided everything up to and including their electric toothbrush was...
Forum: Fiberglass 05-15-2020, 09:02 AM
Replies: 22
Views: 1,354
Posted By DanH
https://www.danhorton.net/VAF/Fiberglass%20Fabrica...

https://www.danhorton.net/VAF/Fiberglass%20Fabrication/Scarf%20Joints.jpg
Forum: RV-12/RV-12iS 05-15-2020, 06:34 AM
Replies: 14
Views: 954
Posted By DanH
Traditionally, vapor lock refers to the formation...

Traditionally, vapor lock refers to the formation of a vapor bubble in the inlet line to a pump, due to the combined effects of reduced pressure and heat.

Boiling the contents of a float bowl is...
Forum: RV Ongoing Maintenance Issues 05-14-2020, 04:37 PM
Replies: 56
Views: 6,882
Posted By DanH
Go back and look at the plot. Temperature goes...

Go back and look at the plot.

Temperature goes up, relative humidity goes down. Temperature goes down, relative humidity goes up. Perfectly normal.

Quantify it. Assume 100F and 11% (middle of...
Forum: Fiberglass 05-13-2020, 09:46 AM
Replies: 22
Views: 1,354
Posted By DanH
Perhaps you meant Poly Fiber Smooth Prime? Super...

Perhaps you meant Poly Fiber Smooth Prime?

Super Fil is a two-part epoxy filler, basically expensive pre-mixed epoxy and microballoons
Forum: RV-14 05-13-2020, 09:39 AM
Replies: 12
Views: 1,977
Posted By DanH
Interesting indeed. I didn't catch that...

Interesting indeed. I didn't catch that change.



The 80mm body bolts to an RSA-10 size flange?
Forum: Fiberglass 05-13-2020, 05:52 AM
Replies: 22
Views: 1,354
Posted By DanH
Gaps, holes, and shaping around pillars are all...

Gaps, holes, and shaping around pillars are all jobs for micro.

This is honeycomb and glass, faired with micro, sealed with an epoxy skim, followed by wet-on-wet epoxy primer and PPG K36 high...
Forum: RV-14 05-12-2020, 09:14 PM
Replies: 12
Views: 1,977
Posted By DanH
There is unlikely to be a significant difference...

There is unlikely to be a significant difference in induction air temperature between the standard forward induction, and the "cold air" sump.

The standard plenum intake does not pass induction air...
Forum: Fiberglass 05-12-2020, 02:34 PM
Replies: 22
Views: 1,354
Posted By DanH
Dry micro (microballoons and epoxy) is used to...

Dry micro (microballoons and epoxy) is used to change contour. Microballoons add fill bulk with very little weight.

Cabolsil makes resin thixotropic...it doesn't run. Cabo is not a filler...
Forum: Traditional Aircraft Engines 05-12-2020, 06:24 AM
Replies: 11
Views: 1,246
Posted By DanH
Lycoming, no, as Vic says. Some Superior engines...

Lycoming, no, as Vic says. Some Superior engines with roller tappets, yes, but the whole point of roller tappets is to not eat cam lobes.
Forum: RV-10 05-11-2020, 11:18 AM
Replies: 3
Views: 507
Posted By DanH
....and if "I have advanced the timing setup..."...

....and if "I have advanced the timing setup..." means you did the timing set procedure with the case split aligned with the third tooth to the left of the TDC mark (viewed from the back), your base...
Forum: RV-10 05-11-2020, 05:57 AM
Replies: 14
Views: 1,416
Posted By DanH
Joe, there are always things to improve, but...

Joe, there are always things to improve, but beware...it's easy to fall victim to a dread homebuilder's desease called "Optionitis". Symptons can be as benign as an empty wallet, but quite a few...
Forum: RV General Discussion/News 05-10-2020, 06:08 AM
Replies: 2
Views: 270
Posted By DanH
Flew about 500 hours with two p-leads in the...

Flew about 500 hours with two p-leads in the single wiring bundle. No issues with the GRT EIS or the audio.

BTW, no flopping p-leads...
Forum: Electronic Ignition Systems 05-09-2020, 07:57 AM
Replies: 43
Views: 3,105
Posted By DanH
Fuel is an interesting subject, often not well...

Fuel is an interesting subject, often not well understood.

Probably the best web resource on gasoline has been around a long time.

...
Forum: RV General Discussion/News 05-09-2020, 06:23 AM
Replies: 3
Views: 402
Posted By DanH
Perhaps instead, a tool for considering...

Perhaps instead, a tool for considering configuration?

http://www.vansairforce.com/community/showpost.php?p=1423589&postcount=22

The above example was an attempt at optimizing for CPi EI, which has...
Forum: Electronic Ignition Systems 05-08-2020, 06:19 AM
Replies: 43
Views: 3,105
Posted By DanH
Cryptic, but appears to relate flame speed with...

Cryptic, but appears to relate flame speed with octane number. Can you suggest a data source measuring the difference in flame speed between mogas and 100LL? I suspect the difference is very...
Forum: Electronic Ignition Systems 05-07-2020, 01:01 PM
Replies: 43
Views: 3,105
Posted By DanH
Tell us more Bob. Why? Break. Everyone note,...

Tell us more Bob. Why?

Break.

Everyone note, Mike's motor is a parallel valve.
Forum: RV General Discussion/News 05-07-2020, 08:17 AM
Replies: 22
Views: 1,596
Posted By DanH
These days, that is known as a "Fake News"...

These days, that is known as a "Fake News" response.

To be specific, what you wrote was...

"You want your oil to be at or about the water boiling point 212F. Oil Temp in the cylinder heads near...
Forum: VAF Classifieds (posts in here deleted after 30 days) 05-06-2020, 09:32 PM
Replies: 2
Views: 271
Posted By DanH
Wanted: RV-3 or RV-4 Canopy, Damaged May Be OK

Working on a project in need of a better canopy arrangement. The front half of an RV-4 canopy would probably work, or maybe an RV-3. Before I go shopping for a new one, does anyone have a canopy...
Forum: RV General Discussion/News 05-06-2020, 09:24 PM
Replies: 27
Views: 3,046
Posted By DanH
I do my best to emulate Figs. Working on the...

I do my best to emulate Figs. Working on the accent, but so far I've failed to develop a taste for Sambuca.
Forum: RV General Discussion/News 05-05-2020, 01:11 PM
Replies: 22
Views: 1,596
Posted By DanH
Good grief. Not that old notion again.

Good grief. Not that old notion again.
Forum: My RV Build Project 05-05-2020, 09:03 AM
Replies: 497
Views: 266,219
Posted By DanH
Dave, the Showplanes setup glues the inside...

Dave, the Showplanes setup glues the inside surface of the canopy to the outside of a fiberglass flange on the primary glass frame structure. The plexi has holes drilled in it along that flange,...
Forum: RV General Discussion/News 05-04-2020, 09:24 PM
Replies: 35
Views: 2,596
Posted By DanH
The usual. Max expected current plus some,...

The usual. Max expected current plus some, protecting a wire which will carry a little more.

Made a sloppy error on the previous drawing. This one corrected. Eliminates the fusible link in the...
Forum: RV General Discussion/News 05-04-2020, 11:36 AM
Replies: 27
Views: 3,046
Posted By DanH
Out fooling around Sunday evening. Dropped some...

Out fooling around Sunday evening. Dropped some flap and eased up in slow flight on some buddies in an S-7. Kirk whipped out his fancy new iPhone, and sent this later.

It's done with a...
Forum: RV Ongoing Maintenance Issues 05-04-2020, 07:55 AM
Replies: 56
Views: 6,882
Posted By DanH
Me too. No visible steam exiting the open tube. ...

Me too. No visible steam exiting the open tube. OAT was 78F, so maybe just not condensing enough to be visible. Looking down into the tube with a flashlight, there was fog of some kind, but I...
Forum: RV General Discussion/News 05-03-2020, 07:46 AM
Replies: 35
Views: 2,596
Posted By DanH
Even Bob doesn't follow that advice. Z101...

Even Bob doesn't follow that advice. Z101 attaches the backup alternator's 10 AWG B-lead to the battery, using a 14AWG fusible link for circuit protection. ...
Forum: RV General Discussion/News 05-02-2020, 01:42 PM
Replies: 35
Views: 2,596
Posted By DanH
Like this...

Like this Mike:

https://www.danhorton.net/VAF/Please%20Critique%20My%20Electrical%20Plan/MikeAltB.jpg

I'd put the battery bus on the cockpit side of the firewall, as shown by the purple line. ...
Forum: RV General Discussion/News 05-02-2020, 06:13 AM
Replies: 35
Views: 2,596
Posted By DanH
Good comments John. Mike's latest diagram...

Good comments John.



Mike's latest diagram moves the ALT B regulator's field, sense, and light connections to the main bus. I don't understand why.

Normal operation has ALT B ready to begin...
Forum: RV General Discussion/News 05-01-2020, 08:44 AM
Replies: 35
Views: 2,596
Posted By DanH
Main alternator is switched in the drawing, one...

Main alternator is switched in the drawing, one of those progressive toggles allowing BATT or BATT+ALT.

Hey Mike, if you ask B&C why the ALT is switched, let us know too.
Forum: RV-8/8A 05-01-2020, 06:07 AM
Replies: 4
Views: 740
Posted By DanH
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=138805
Forum: RV General Discussion/News 05-01-2020, 06:02 AM
Replies: 35
Views: 2,596
Posted By DanH
A big...

A big fuse.

https://bandc.com/product/anl-current-limiter-base-standard/

https://bandc.com/product/anl-current-limiters-35a-through-130a/



Ahh yes, brain fart. Main bus tap is a low volt sense,...
Forum: RV General Discussion/News 04-30-2020, 03:11 PM
Replies: 35
Views: 2,596
Posted By DanH
The key reason would be keeping the battery bus...

The key reason would be keeping the battery bus and navcom bus alive after opening the master contactor, without depleting the battery. It also keeps the standby alternator ballasted with the...
Forum: Traditional Aircraft Engines 04-28-2020, 10:08 AM
Replies: 17
Views: 1,894
Posted By DanH
Check the lower spark plug for tightness.

Check the lower spark plug for tightness.
Forum: Traditional Aircraft Engines 04-27-2020, 03:48 PM
Replies: 42
Views: 7,276
Posted By DanH
Most EI's provide the same timing as a standard...

Most EI's provide the same timing as a standard magneto at high power, plus advanced timing with decreased manifold pressure. Some have the option of modifying or eliminating the advance function. ...
Forum: Traditional Aircraft Engines 04-27-2020, 02:11 PM
Replies: 42
Views: 7,276
Posted By DanH
Not messy at all. Mag/mag, mag/EI, and EI/EI...

Not messy at all.

Mag/mag, mag/EI, and EI/EI combinations all spark simultaneously at high power. At high power, if one is too far advanced, one or more cylinders may tip into detonation. If one...
Forum: Traditional Aircraft Engines 04-27-2020, 12:12 PM
Replies: 42
Views: 7,276
Posted By DanH
I would say no. The fixed timing magneto only...

I would say no. The fixed timing magneto only becomes irrelevant if the opposing flame front has already passed when it sparks.

The initial inflammation and subsequent flame spread requires time....
Forum: RV General Discussion/News 04-26-2020, 01:25 PM
Replies: 15
Views: 2,152
Posted By DanH
https://www.danhorton.net/VAF/Gas%20Gun%20and%20Ot...

https://www.danhorton.net/VAF/Gas%20Gun%20and%20Other%20Underwing%20Things/Gun%20Camera%201.mp4
Forum: Traditional Aircraft Engines 04-26-2020, 08:41 AM
Replies: 42
Views: 7,276
Posted By DanH
Was on the home page, but not now. They may have...

Was on the home page, but not now. They may have made some changes.
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