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Search: Posts Made By: DanH
Forum: Fuel Injection Systems Today, 08:26 AM
Replies: 9
Views: 327
Posted By DanH
Learn to use EGT indications also. They will...

Learn to use EGT indications also. They will remain accurate long term.



What Mike and Marvin said.



Tune to produce rated power for all RPM/MP combinations, with LOP set manually. LOP is...
Forum: RV General Discussion/News Yesterday, 12:24 PM
Replies: 40
Views: 3,162
Posted By DanH
Gentlemen, let's be realistic please. True,...

Gentlemen, let's be realistic please.

True, George doesn't seem to grasp the difference between lithium ion and LiFePo4.

However, "safe" is perhaps an inappropriate term, something akin to "My RV...
Forum: RV General Discussion/News Yesterday, 08:41 AM
Replies: 40
Views: 3,162
Posted By DanH
This incident (or one very similar) was much...

This incident (or one very similar) was much discussed in this forum. Alternator over-voltage went high enough to burn through the BMS protection, which EarthX represented as blocking incoming...
Forum: RV-7/7A 12-08-2019, 06:47 AM
Replies: 18
Views: 1,179
Posted By DanH
Use stainless rather than an oxide finish or...

Use stainless rather than an oxide finish or plated steel. We want bulletproof fuel systems, so corrosion performance is notable. I've done one AOG call with rusty fittings. I don't know what got...
Forum: Electronic Ignition Systems 12-08-2019, 06:42 AM
Replies: 223
Views: 83,036
Posted By DanH
Colin isn't cutting a taper. The idea here is to...

Colin isn't cutting a taper. The idea here is to re-purpose shafts taken from old mags...with an existing taper, keyway and threads.
Forum: RV-14 12-07-2019, 09:07 PM
Replies: 13
Views: 1,482
Posted By DanH
Theory says a reduction in crankcase air density...

Theory says a reduction in crankcase air density reduces pumping loss. I can't put a HP value on it; no Lycoming with-and-without dyno data. I have seen positive dyno reports for car engines, ran...
Forum: RV-8/8A 12-07-2019, 05:58 PM
Replies: 9
Views: 666
Posted By DanH
Mine is a 390 with a metal Hartzell, so it's as...

Mine is a 390 with a metal Hartzell, so it's as nose heavy as any. Put him in touch and I'll send a W&B Excel spreadsheet.

Short version; when solo, it will be at, or a little beyond the forward...
Forum: RV-14 12-07-2019, 05:45 PM
Replies: 13
Views: 1,482
Posted By DanH
Thanks, found...

Thanks, found it.

https://generalaviationnews.com/2016/03/28/no-1-rule-about-an-air-oil-separator/

Unfortunately, Mr. Visser erred in a few points of physical law.

First, a temperature of 212F...
Forum: Traditional Aircraft Engines 12-07-2019, 07:50 AM
Replies: 57
Views: 5,951
Posted By DanH
I've noticed the same. Unfortunately,...

I've noticed the same. Unfortunately, fear-mongering with "them" (insert: trade, race, nationality, religious affiliation, whatever) playing the bad guy is an effective technique for building a...
Forum: RV-14 12-07-2019, 06:47 AM
Replies: 13
Views: 1,482
Posted By DanH
Very interesting. Could you direct us to these...

Very interesting. Could you direct us to these "resources"?
Forum: Electronic Ignition Systems 12-06-2019, 05:37 PM
Replies: 223
Views: 83,036
Posted By DanH
I did not accurately reference that location. I...

I did not accurately reference that location. I referenced the mounted and torqued drive gear to the accessory case sealing surface. My drawings say 29mm from seal surface to center of the gear...
Forum: Electronic Ignition Systems 12-06-2019, 04:26 PM
Replies: 223
Views: 83,036
Posted By DanH
Not sure of what your mean by "shaft shoulder". ...

Not sure of what your mean by "shaft shoulder". Got a drawing for dummies?
Forum: Electronic Ignition Systems 12-06-2019, 10:31 AM
Replies: 223
Views: 83,036
Posted By DanH
Set screws? Better with a roll pin. I briefly...

Set screws? Better with a roll pin.



I briefly considered attaching the wheel as Electroair does, i.e. a center screw and a tiny index pin. In the end I elected to cross pin it like the bearing...
Forum: Electronic Ignition Systems 12-06-2019, 07:37 AM
Replies: 223
Views: 83,036
Posted By DanH
Like the o-ring accessory case seal. Nice touch,...

Like the o-ring accessory case seal. Nice touch, should have done that to mine.

The snap ring will be hard to install with the toothed wheel pinned to the shaft.

The 25x15x12 spacer must also be...
Forum: VAF Classifieds (posts in here deleted after 30 days) 12-03-2019, 07:21 AM
Replies: 6
Views: 1,547
Posted By DanH
The insurance company is willing to total it? ...

The insurance company is willing to total it? Let it go!

Sure, it can be repaired, but why would you want it? Right now you can get all your money, and simply go shopping again. The alternate is...
Forum: RV-10 12-03-2019, 07:07 AM
Replies: 16
Views: 1,093
Posted By DanH
http://www.aeroelectric.com/articles/grnding.pdf

http://www.aeroelectric.com/articles/grnding.pdf
Forum: RV Ongoing Maintenance Issues 12-03-2019, 06:50 AM
Replies: 31
Views: 3,481
Posted By DanH
Right...nothing custom here, just a better idea...

Right...nothing custom here, just a better idea from a different pipe vendor. I've posted it in the last thirty or so "My exhaust hanger broke" threads, but apparently folks love flattened tubes and...
Forum: RV Ongoing Maintenance Issues 12-02-2019, 07:47 AM
Replies: 31
Views: 3,481
Posted By DanH
https://www.danhorton.net/VAF/Cracked%20Exhaust%20...

https://www.danhorton.net/VAF/Cracked%20Exhaust%20Hanger/Exhaust%20Hanger.jpg

https://www.danhorton.net/VAF/Cracked%20Exhaust%20Hanger/P1020012.JPG
Forum: RV-7/7A 12-01-2019, 05:36 PM
Replies: 35
Views: 4,570
Posted By DanH
When benched at 1560 lbs per hour, pressure drops...

When benched at 1560 lbs per hour, pressure drops were 10" H2O for an AFP FM-150, vs 12.75" for an RSA-5, which has the same bore configuration as an AvStar. 2.75" H20 is 0.2" Hg, not a big...
Forum: RV General Discussion/News 12-01-2019, 07:18 AM
Replies: 23
Views: 2,859
Posted By DanH
Optionitis (op - shun- i - tus) A disease...

Optionitis (op - shun- i - tus)

A disease commonly infecting aircraft homebuilders. First time builders are particularly prone to infection, as like most diseases, immunity is developed by prior...
Forum: RV-7/7A 11-29-2019, 12:47 PM
Replies: 16
Views: 2,327
Posted By DanH
I'm with Sam. Get an experienced painter to look...

I'm with Sam. Get an experienced painter to look at it. There are many kinds of "dull" with different causes.
Forum: RV Ongoing Maintenance Issues 11-24-2019, 06:47 AM
Replies: 14
Views: 3,888
Posted By DanH
http://www.vansairforce.com/community/showpost.php...

http://www.vansairforce.com/community/showpost.php?p=1277232&postcount=17

Show me.
Forum: Alternative Engines 11-23-2019, 06:56 AM
Replies: 462
Views: 68,714
Posted By DanH
Case pressure is typically measured in units much...

Case pressure is typically measured in units much smaller than PSI. For example, the Lycoming case pressure limit is something like 4~5 inches of water. One (1) psi is 27.67 inches H2O. Perhaps a...
Forum: Fiberglass 11-22-2019, 05:41 PM
Replies: 9
Views: 574
Posted By DanH
Marty, you don't need a course. Order the...

Marty, you don't need a course. Order the practice kit below, with book. Read the manual a few times, and build the practice parts exactly as...
Forum: RV General Discussion/News 11-22-2019, 07:46 AM
Replies: 62
Views: 4,702
Posted By DanH
Jeff, we have some serious engine guys here. ...

Jeff, we have some serious engine guys here. Other than a tiny number of Reno racers, most are interested in making their installations more efficient, not more powerful.

Hang around long enough...
Forum: RV General Discussion/News 11-21-2019, 05:33 PM
Replies: 20
Views: 1,597
Posted By DanH
Me too. And darn, I wish I could write that well.

Me too.

And darn, I wish I could write that well.
Forum: RV General Discussion/News 11-21-2019, 04:20 PM
Replies: 15
Views: 1,447
Posted By DanH
56.52 inlet area, 40 sq inches exit area, a ratio...

56.52 inlet area, 40 sq inches exit area, a ratio of 1/.76, roughly the reverse of the inlet/exit ratio claims of old...which were usually expressed by someone who insisted the exit must be 20%...
Forum: RV General Discussion/News 11-20-2019, 01:13 PM
Replies: 15
Views: 1,447
Posted By DanH
Total 56.52 sq inches. No, it's not over-cooled....

Total 56.52 sq inches. No, it's not over-cooled. Can you tell us why?
Forum: RV-8/8A 11-19-2019, 01:52 PM
Replies: 6
Views: 600
Posted By DanH
Sure. No photo on the hard drive, but I'll shoot...

Sure. No photo on the hard drive, but I'll shoot one next trip to the airport.
Forum: RV-8/8A 11-19-2019, 08:23 AM
Replies: 6
Views: 600
Posted By DanH
Jeff, impression only, based on operating the...

Jeff, impression only, based on operating the canopy on the runup pad; there is a good bit of lift even at low RPM on the ground. I would not want to be the first to try moving it from the closed...
Forum: RV General Discussion/News 11-18-2019, 10:26 PM
Replies: 15
Views: 1,447
Posted By DanH
George, do some reading, please. ...

George, do some reading, please.

http://www.n91cz.net/Interesting_Technical_Reports/106-111_BuildingBasics.pdf

Now consider...for any given engine, a designer may select a low velocity ratio...
Forum: RV General Discussion/News 11-18-2019, 09:15 PM
Replies: 62
Views: 4,702
Posted By DanH
A very high percentage of the RV community can't...

A very high percentage of the RV community can't cool stock power in a continuous long climb.
Forum: RV-8/8A 11-18-2019, 06:51 AM
Replies: 16
Views: 1,802
Posted By DanH
Been there done that...bad juju.

Been there done that...bad juju.
Forum: RV General Discussion/News 11-18-2019, 06:45 AM
Replies: 21
Views: 3,260
Posted By DanH
Grounded +1

Grounded +1
Forum: RV General Discussion/News 11-17-2019, 08:41 AM
Replies: 15
Views: 1,447
Posted By DanH
Nope. Mass flow (cooling air in) is...

Nope.

Mass flow (cooling air in) is fundamentally determined by exit area, not inlet area. The measure of a cooling inlet is how well it harvests available dynamic pressure. There is no tailoring...
Forum: RV General Discussion/News 11-16-2019, 08:00 AM
Replies: 15
Views: 1,447
Posted By DanH
Parallel valve or angle valve? What mods to the...

Parallel valve or angle valve?

What mods to the James cowl? And long or short?
Forum: Fiberglass 11-16-2019, 07:52 AM
Replies: 11
Views: 1,152
Posted By DanH
Larry, you seem to be describing a release layer,...

Larry, you seem to be describing a release layer, which can be a woven product or a film, rather than a peel ply.

The practical difference? After removal, a release layer leaves a surface...
Forum: RV General Discussion/News 11-15-2019, 07:46 AM
Replies: 25
Views: 2,774
Posted By DanH
How much increase? Theory says it...

How much increase? Theory says it should.



Thanks for mentioning that Milon. It cannot be stressed enough.

Rather than "100 hours or annually", I'd suggest developing a cleaning schedule based...
Forum: RV General Discussion/News 11-13-2019, 09:02 PM
Replies: 25
Views: 2,774
Posted By DanH
#13 http://www.vansairforce.com/community/showpos...

#13

http://www.vansairforce.com/community/showpost.php?p=1296178&postcount=2
Forum: RV General Discussion/News 11-13-2019, 02:17 PM
Replies: 25
Views: 2,774
Posted By DanH
It will make a mess. The breather hose coughs...

It will make a mess. The breather hose coughs out aerosol oil droplets. They will probably remain aerosol and simply exit the bottle vent, rather than collecting in the bottle.
Forum: RV General Discussion/News 11-13-2019, 12:51 PM
Replies: 25
Views: 2,774
Posted By DanH
If by "overflow tube" you mean the line which...

If by "overflow tube" you mean the line which drains separated liquid from the separator can, a catch bottle will work. See Fig.1 in the linked article.

However, it's awkward. Gotta pull the cowl...
Forum: RV General Discussion/News 11-13-2019, 07:41 AM
Replies: 25
Views: 2,774
Posted By DanH
Except it's not the whole story. Mike's cup 'o...

Except it's not the whole story.

Mike's cup 'o **** is exactly what is to be expected if the separator's liquid output is routed to a catch bottle. Each cold start feeds condensed water to the...
Forum: Propellers 11-12-2019, 10:32 AM
Replies: 19
Views: 1,648
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 11-12-2019, 07:37 AM
Replies: 19
Views: 1,648
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 11-11-2019, 08:23 PM
Replies: 19
Views: 1,648
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 11-11-2019, 03:38 PM
Replies: 19
Views: 1,648
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 11-11-2019, 10:30 AM
Replies: 19
Views: 1,648
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: RV-7/7A 11-04-2019, 06:59 AM
Replies: 15
Views: 2,433
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: 16
Views: 2,057
Posted By DanH
Did you ever find that...

Did you ever find that report?

http://www.vansairforce.com/community/showpost.php?p=1348633&postcount=14
Forum: RV Building Tips/Techniques 11-03-2019, 06:09 AM
Replies: 3
Views: 722
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: 2,821
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: 18
Views: 2,779
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: 39
Views: 3,162
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: 15,264
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: 39
Views: 3,162
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: 15,264
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: 39
Views: 3,162
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: 4,255
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: 14,096
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: 1,106
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: 639
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: 2,821
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...
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