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Search: Posts Made By: DanH
Forum: Propellers Today, 10:32 AM
Replies: 19
Views: 1,072
Posted By DanH
The FAA publishes a good AC on propeller...

The FAA publishes a good AC on propeller vibration certification:

https://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/1018497

In addition, Marc...
Forum: Propellers Today, 07:37 AM
Replies: 19
Views: 1,072
Posted By DanH
Ahh. I'll go back and delete that note, so as to...

Ahh. I'll go back and delete that note, so as to not further confuse the issue under discussion...propeller blade stress increase due to increasing ignition advance.
Forum: Propellers Yesterday, 08:23 PM
Replies: 19
Views: 1,072
Posted By DanH
I'm not sure what Superior thoughts you refer to,...

I'm not sure what Superior thoughts you refer to, but 20 and 25 are base timing figures with little bearing on the subject under discussion.
Forum: Propellers Yesterday, 03:38 PM
Replies: 19
Views: 1,072
Posted By DanH
Not a question of more or less forgiving. As...

Not a question of more or less forgiving. As compared to an parallel valve, the angle valve merely requires less advance to reach optimum performance.

Remember, advance is compensation for...
Forum: Propellers Yesterday, 10:30 AM
Replies: 19
Views: 1,072
Posted By DanH
And technically, "electronic ignition" has...

And technically, "electronic ignition" has nothing to do with it.

The issue is advanced timing, not the method of generating a spark. A magneto set for advanced timing would net the same result. ...
Forum: VAF Classifieds (posts in here deleted after 30 days) 11-04-2019, 02:01 PM
Replies: 26
Views: 1,806
Posted By DanH
See, I told you an LSU fan might not have a good...

See, I told you an LSU fan might not have a good time in Tuscaloosa ;)
Forum: RV-7/7A 11-04-2019, 06:59 AM
Replies: 14
Views: 1,752
Posted By DanH
That would be one accident report, the Alexander...

That would be one accident report, the Alexander RV-8. Got links to others?

There was one report of a melting windshield on a Kitfox, but the early KF round cowl and windshield arrangement is very...
Forum: Electronic Ignition Systems 11-04-2019, 06:26 AM
Replies: 15
Views: 1,196
Posted By DanH
Note for parallel valve owners...the plug numbers...

Note for parallel valve owners...the plug numbers discussed here are probably all short reach, for parallel valve engines.



Did you ever find that...
Forum: RV Building Tips/Techniques 11-03-2019, 06:09 AM
Replies: 3
Views: 500
Posted By DanH
Well done. An insert is a poor choice, as it...

Well done.

An insert is a poor choice, as it does not change frontal area, and the no-flow area behind it will have a low pressure wake, a miniature of the one you feel when driving close behind a...
Forum: Fuel Injection Systems 11-03-2019, 05:48 AM
Replies: 28
Views: 1,987
Posted By DanH
Bruce, let me throw a strategic thought in...

Bruce, let me throw a strategic thought in here.

Although we tend toward a culture of "backup everything", there is an argument which says additional components and complexity (an integrated backup...
Forum: RV Friends Who Have Passed On 11-02-2019, 09:48 AM
Replies: 17
Views: 1,599
Posted By DanH
Boomer arranged tours of a KC135 tanker at OSH...

Boomer arranged tours of a KC135 tanker at OSH some years back. Pretty sure David flew them in his AF days. Anyway, the memory I have of him is watching him bounce down the airstair after his tour....
Forum: RV General Discussion/News 11-01-2019, 09:02 AM
Replies: 38
Views: 2,378
Posted By DanH
Possibly a lesson Surefly is learning (Caution;...

Possibly a lesson Surefly is learning (Caution; speculation).

The EDIS modules I'm flying fire the plugs something before TDC at cranking speeds. The degree value of "something" appears to vary...
Forum: Alternative Engines 11-01-2019, 07:41 AM
Replies: 42
Views: 14,603
Posted By DanH
Depends on the wording of your 2004 contract. ...

Depends on the wording of your 2004 contract. And how badly they want one on a customer airplane.

Next year's price? Not a chance.
Forum: RV General Discussion/News 10-31-2019, 07:23 PM
Replies: 38
Views: 2,378
Posted By DanH
For you Figs....anything ;) The engine side of a...

For you Figs....anything ;)

The engine side of a standard Lycoming flywheel looks like this:

https://www.danhorton.net/VAF/Starter%20Kickback%20on%20Surefly%20Install/Timing%20References.jpg

When...
Forum: Alternative Engines 10-31-2019, 09:30 AM
Replies: 42
Views: 14,603
Posted By DanH
Easy...cash on delivery, no exceptions, assuming...

Easy...cash on delivery, no exceptions, assuming you still want it.
Forum: RV General Discussion/News 10-31-2019, 07:13 AM
Replies: 38
Views: 2,378
Posted By DanH
Although fuel plays a role in what happens after...

Although fuel plays a role in what happens after the plugs fire, it has no effect on when the plugs fire.

Here the fundamental concern is when. In general, firing at TDC or a little before is...
Forum: RV Ongoing Maintenance Issues 10-30-2019, 01:34 PM
Replies: 46
Views: 3,276
Posted By DanH
Certainly the VR and brushes, if not the whole...

Certainly the VR and brushes, if not the whole alternator. https://www.unipoint.com.tw/index.php

Removed from Plane...
Forum: RV-14 10-30-2019, 07:55 AM
Replies: 57
Views: 12,623
Posted By DanH
Folks who love their shop time are tired of...

Folks who love their shop time are tired of seeing this thread.

Bad parts and do-overs are part of the learning curve. And they suggest the builder is exercising good judgement in recognizing poor...
Forum: RV General Discussion/News 10-29-2019, 05:11 PM
Replies: 9
Views: 986
Posted By DanH
Now there's some real testimony...

Now there's some real testimony...
Forum: RV General Discussion/News 10-28-2019, 09:40 AM
Replies: 9
Views: 522
Posted By DanH
I'm with Mel; undo the recent change and see what...

I'm with Mel; undo the recent change and see what happens.

That said, and given the RV-4 is new to you, why not check the engine logs to see when it last had a new pump installed? The rubber parts...
Forum: Fuel Injection Systems 10-28-2019, 07:58 AM
Replies: 28
Views: 1,987
Posted By DanH
Bruce, go for it. My impression is that the...

Bruce, go for it.

My impression is that the tubular magnetic pickup has not always been super reliable. For sure I didn't like the way they are fixated in the case, with a set screw driven into...
Forum: VAF Classifieds (posts in here deleted after 30 days) 10-27-2019, 04:27 PM
Replies: 26
Views: 1,806
Posted By DanH
I hear ya' brother. Truth is, it's likely to be...

I hear ya' brother. Truth is, it's likely to be quite a game.
Forum: RV General Discussion/News 10-27-2019, 09:14 AM
Replies: 20
Views: 1,691
Posted By DanH
A glance at Weathermeister or similar tells the...

A glance at Weathermeister or similar tells the tale regarding winds that large, prior to launch. Winds are big picture stuff, with generally reliable forecasts.
Forum: VAF Classifieds (posts in here deleted after 30 days) 10-27-2019, 09:05 AM
Replies: 26
Views: 1,806
Posted By DanH
What makes you think an LSU fan will have a good...

What makes you think an LSU fan will have a good time in Tuscaloosa? :D
Forum: RV General Discussion/News 10-26-2019, 02:01 PM
Replies: 20
Views: 1,691
Posted By DanH
Never saw much value in either with the -8, and...

Never saw much value in either with the -8, and getting them doubles the subscription price. Are you just doing it because of the -9's wing, popping to 15-18K when the winds are worth it?
Forum: RV General Discussion/News 10-26-2019, 09:34 AM
Replies: 20
Views: 1,691
Posted By DanH
If anything, strategic weather information is...

If anything, strategic weather information is more valuable for the cross-country VFR pilot, not less.

I'm an XM subscriber. Every year, there are a few flights which would have been impossible...
Forum: RV General Discussion/News 10-26-2019, 09:24 AM
Replies: 20
Views: 1,691
Posted By DanH
Crossfield had subscribed to XM service, but the...

Crossfield had subscribed to XM service, but the required antenna was not installed. He depended on preflight weather briefings and controller advisories. The controller failed to inform, and...
Forum: RV General Discussion/News 10-26-2019, 09:01 AM
Replies: 24
Views: 3,432
Posted By DanH
The aluminum frame is a big plus...coefficient of...

The aluminum frame is a big plus...coefficient of thermal expansion closer to plexiglass, as compared to steel.

Best method? Compared to steel or aluminum, best to bond acrylic into a glass/epoxy...
Forum: Electronic Ignition Systems 10-24-2019, 08:40 AM
Replies: 50
Views: 11,029
Posted By DanH
Best cure would be to stop accepting devices...

Best cure would be to stop accepting devices unsuited for the prevalent temperatures.
Forum: RV-9/9A 10-24-2019, 08:31 AM
Replies: 11
Views: 725
Posted By DanH
You're both right, within reason. Static...

You're both right, within reason.

Static pressure + dynamic pressure = total pressure. Static and dynamic can be traded back and forth while total remains the same. We typically slow the air, i.e....
Forum: RV General Discussion/News 10-23-2019, 06:18 PM
Replies: 19
Views: 2,978
Posted By DanH
My mother lives in the Harrisburg PA area, and I...

My mother lives in the Harrisburg PA area, and I live in south Alabama. As the years go by, "Mom Runs" have become more frequent, and I am very, very glad to have the RV-8.

This weekend was no...
Forum: Electronic Ignition Systems 10-22-2019, 06:01 PM
Replies: 50
Views: 11,029
Posted By DanH
In simple terms, when the cooling air stops, all...

In simple terms, when the cooling air stops, all component temperatures begin to equalize.
Forum: RV General Discussion/News 10-21-2019, 09:36 PM
Replies: 6
Views: 639
Posted By DanH
The stud at 12 o'clock is short, and only...

The stud at 12 o'clock is short, and only threaded into the case spigot. If it is leaking oil, there is a good chance it has pulled out the aluminum threads. Even if the threads are not damaged,...
Forum: RV Ongoing Maintenance Issues 10-18-2019, 01:05 PM
Replies: 14
Views: 1,230
Posted By DanH
Comparison with the "calibrated" leakage orifice...

Comparison with the "calibrated" leakage orifice is a Continental standard, not Lycoming. And no, I am not surprised.

Perhaps it would be best to read the appropriate manufacturer's...
Forum: RV General Discussion/News 10-18-2019, 09:54 AM
Replies: 35
Views: 3,946
Posted By DanH
Ok, so before and after the wrap were both at 35...

Ok, so before and after the wrap were both at 35 psi. Cool.
Forum: RV General Discussion/News 10-18-2019, 09:47 AM
Replies: 35
Views: 3,946
Posted By DanH
Ummmm. That would be TWO changes, negating any...

Ummmm. That would be TWO changes, negating any sure conclusion about the wrap. Have you experimented before and after at the same tire pressure?



My guess too, if there is damping, i.e. removal...
Forum: RV Ongoing Maintenance Issues 10-18-2019, 09:40 AM
Replies: 14
Views: 1,230
Posted By DanH
Yes. https://www.lycoming.com/sites/default/files...

Yes.

https://www.lycoming.com/sites/default/files/Cylinder%20Compression.pdf
Forum: RV Ongoing Maintenance Issues 10-18-2019, 07:31 AM
Replies: 14
Views: 1,230
Posted By DanH
No, they don't. The gauge orifice for small...

No, they don't.

The gauge orifice for small engines has specified diameter of 0.040”
and an entrance angle between 59 and 60 degrees. You’ll find references
requiring a 0.060” orifice for use with a...
Forum: RV-7/7A 10-17-2019, 04:07 PM
Replies: 14
Views: 1,752
Posted By DanH
True, an aluminum foil faced glass mat is comfort...

True, an aluminum foil faced glass mat is comfort insulation, not fire protection....but smoke, flame, etc won't hurt anything when it's forward of the firewall. Assuming good gas sealing (the...
Forum: RV-7/7A 10-17-2019, 01:52 PM
Replies: 14
Views: 1,752
Posted By DanH
Obviously polysulfide is a good sealer. That...

Obviously polysulfide is a good sealer. That said, Permatex Ultra Black (aka Loctite 598) has proven to be very oil resistant. Recall quite a few of us have been making silicone/glass cylinder...
Forum: RV General Discussion/News 10-17-2019, 07:32 AM
Replies: 35
Views: 3,946
Posted By DanH
Indeed. Anyone care to speculate about how it...

Indeed. Anyone care to speculate about how it works?
Forum: RV General Discussion/News 10-16-2019, 09:30 PM
Replies: 47
Views: 8,205
Posted By DanH
Nope, Kat is a one and only. Three? Boy, are...

Nope, Kat is a one and only. Three? Boy, are you in for it....



She will love the trails in Petit Jean Park.
Forum: RV General Discussion/News 10-16-2019, 01:32 PM
Replies: 47
Views: 8,205
Posted By DanH
Ms. Patti and I are sorry we missed PJ, but we...

Ms. Patti and I are sorry we missed PJ, but we had a good excuse. May I present Mrs. Katherine Horton Haynes...with umbrella. The crud at PJ on Friday arrived in Alabama on Saturday. Not a good...
Forum: Traditional Aircraft Engines 10-16-2019, 09:13 AM
Replies: 11
Views: 769
Posted By DanH
Oil pressure can certainly spike when cold, but...

Oil pressure can certainly spike when cold, but it's not possible to lift the valve off its seat, even with 150 psi.

Spring check values are in SI 1240C. They appear to be given at the seated...
Forum: RV-7/7A 10-15-2019, 08:25 AM
Replies: 14
Views: 1,752
Posted By DanH
Krea, those posts date from early 2008. Back...

Krea, those posts date from early 2008. Back then we all assumed gluing rubber and plastic to the cabin side of a firewall was a safe practice. I'm including myself, as I recall at least one...
Forum: RV-7/7A 10-14-2019, 07:53 PM
Replies: 14
Views: 1,752
Posted By DanH
You might be interested to know I un-hung my own...

You might be interested to know I un-hung my own engine and mount to install engine-side insulation, after testing showed there was no cabin-side approach nearly as good.

Might I add that I don't...
Forum: RV-14 10-14-2019, 03:08 PM
Replies: 11
Views: 1,003
Posted By DanH
We all have an oil filter adapter. Perhaps you...

We all have an oil filter adapter. Perhaps you are referring to a remote oil filter adapter?
Forum: Traditional Aircraft Engines 10-14-2019, 01:11 PM
Replies: 11
Views: 769
Posted By DanH
You have heard of "morning sickness"?

You have heard of "morning sickness"?
Forum: Traditional Aircraft Engines 10-14-2019, 01:06 PM
Replies: 9
Views: 914
Posted By DanH
#3 has an intake gasket leak. Look at the plots....

#3 has an intake gasket leak.

Look at the plots. #3 gets warmer than the others at full throttle, just because it's a little leaner. The signature is the larger EGT divergence from the others at...
Forum: RV Ongoing Maintenance Issues 10-11-2019, 09:20 AM
Replies: 14
Views: 1,230
Posted By DanH
These days the fundamental choice is to buy a...

These days the fundamental choice is to buy a test set with or without a Continental orifice. You'll need the extra doodad to discuss anything about cylinders with a Continental rep. Not needed for...
Forum: ADS-B 10-10-2019, 04:14 PM
Replies: 16
Views: 1,359
Posted By DanH
May I be the first to send a "Thank you" to the...

May I be the first to send a "Thank you" to the entire Garmin team? It was the right thing to do, and ya'll got 'er done.
Forum: RV-8/8A 10-10-2019, 11:22 AM
Replies: 21
Views: 2,516
Posted By DanH
It does not extend all the way to the freestream,...

It does not extend all the way to the freestream, but rather to the top of a converging exit bell exhausting all the cowl air. Oil cooler mass flow meets the majority mass flow at a right angle,...
Forum: RV General Discussion/News 10-10-2019, 09:10 AM
Replies: 25
Views: 13,717
Posted By DanH
I forgot about the profiles in CR3405, identified...

I forgot about the profiles in CR3405, identified as Kuchemann A-series. They are much as Steve describes in post 23. Start at page 38.

The reference is Aerodynamics of Propulsion, Kuchemann and...
Forum: RV Ongoing Maintenance Issues 10-10-2019, 06:50 AM
Replies: 2
Views: 377
Posted By DanH
Nope. Just means you have a mixture valve with a...

Nope. Just means you have a mixture valve with a very low leak rate. Pump poppet valve too.

The rise is due to temperature
Forum: RV General Discussion/News 10-08-2019, 11:49 AM
Replies: 5
Views: 741
Posted By DanH
Fixed.....

Fixed.....
Forum: RV General Discussion/News 10-08-2019, 10:48 AM
Replies: 5
Views: 741
Posted By DanH
There is a lot more to it than round rings. ...

There is a lot more to it than round rings.

The three plots below were all generated with round inlets, but note the significant differences in upper plenum Cp. ...
Forum: RV General Discussion/News 10-07-2019, 10:58 PM
Replies: 5
Views: 741
Posted By DanH
We all have plenums. It is simply the interior...

We all have plenums. It is simply the interior cowl volume above the engine. That may seem pendantic, but it's important to realize a plenum lid is nothing more than a sealing device to replace...
Forum: RV General Discussion/News 10-06-2019, 02:39 PM
Replies: 25
Views: 13,717
Posted By DanH
In terms of pressure recovery, it works just...

In terms of pressure recovery, it works just fine. It is a low Vi/Vo type, like the cooling inlets....a 4" ring

I built that inlet many moons ago, with an eye on style. It may be separating...
Forum: RV Building Tips/Techniques 10-06-2019, 09:39 AM
Replies: 24
Views: 2,430
Posted By DanH
BTW, do not try to use 2lb density pour foam as...

BTW, do not try to use 2lb density pour foam as core in a finished part. I've not tried 4lb and higher as core, but I'd be real shy about it. Altitude pressure change made 2lb expand and contract...
Forum: RV General Discussion/News 10-06-2019, 09:31 AM
Replies: 36
Views: 2,935
Posted By DanH
Assume 12 sq inches, 170 KTAS, 3500 ft, std day,...

Assume 12 sq inches, 170 KTAS, 3500 ft, std day, and 2400 RPM. Available ram would be 0.85" Hg, a little less than what appears to be available at the cooling intake. However, throw in filter and...
Forum: RV General Discussion/News 10-06-2019, 09:08 AM
Replies: 25
Views: 13,717
Posted By DanH
I don't know of a paper dealing specifically with...

I don't know of a paper dealing specifically with spillage and nacelle forebody shape in the context of a low speed intake.

Any lip radius is a compromise given the variables. Look at the lips on...
Forum: RV Building Tips/Techniques 10-05-2019, 06:31 PM
Replies: 24
Views: 2,430
Posted By DanH
The basic plan is to tape a piece of cardboard or...

The basic plan is to tape a piece of cardboard or typing paper into place to act as a dam, mix/pour the urethane, and stand back while it expands. Do not try to trowel it, shape it, or guide it in...
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