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Search: Posts Made By: DanH
Forum: ADS-B Yesterday, 06:16 PM
Replies: 109
Views: 4,990
Posted By DanH
Ok, so if I read correctly, an FDL-978 owner is...

Ok, so if I read correctly, an FDL-978 owner is not anonymous for the first 15 seconds after start up....and FreeFlight considers it to be a requirement.

So, back to the GDL-82. Assume pin 5 is...
Forum: Traditional Aircraft Engines 02-18-2019, 07:03 PM
Replies: 11
Views: 1,380
Posted By DanH
Fatigue resistance. Pretty sure they rank (best...

Fatigue resistance. Pretty sure they rank (best to worst) kevlar, glass, carbon. I'm too lazy to look up the numbers. If the membrane would be subject to a lot of flexing, it might be worth...
Forum: ADS-B 02-18-2019, 04:02 PM
Replies: 109
Views: 4,990
Posted By DanH
The Drivers Privacy Protection Act has been in...

The Drivers Privacy Protection Act has been in place since 1994.

As a licensed dealer, I'm also a designated agent for my state's DMV. I can tap the database for an owner's name and address if I...
Forum: Traditional Aircraft Engines 02-18-2019, 02:45 PM
Replies: 11
Views: 1,380
Posted By DanH
It would be a better choice, technical speaking....

It would be a better choice, technical speaking. On the other hand, (1) the fiberglass is hanging in there pretty well in the duct application, and (2) I'm too cheap to buy the special scissors which...
Forum: Traditional Aircraft Engines 02-18-2019, 09:08 AM
Replies: 11
Views: 1,380
Posted By DanH
Soft Spot Plenum Lid

RV-8 builders know stuffing an angle valve Lycoming into an RV-8 cowl results in very tight engine to cowl clearance above the front cylinder corners, and down the left side. It gets worse with a...
Forum: Traditional Aircraft Engines 02-18-2019, 08:24 AM
Replies: 35
Views: 7,114
Posted By DanH
The rest of the story. Previously I...

The rest of the story. Previously I wrote:



The answer seems to be ....both.

With the VIP acro mounts, the airframe shake below 2400 felt like an out of balance prop. Vic had done a dynamic...
Forum: RV General Discussion/News 02-17-2019, 06:05 AM
Replies: 24
Views: 1,450
Posted By DanH
Did a first class job of it too. Nice work.

Did a first class job of it too. Nice work.
Forum: ADS-B 02-16-2019, 01:33 PM
Replies: 109
Views: 4,990
Posted By DanH
Rage, rage against the dying of the light.

Rage, rage against the dying of the light.
Forum: Alternative Engines 02-15-2019, 02:33 PM
Replies: 96
Views: 8,724
Posted By DanH
The driving requirement seems to be a need for...

The driving requirement seems to be a need for 130F fuel at injection delivery. The question is thus how to heat the fuel.

Having brainstormed a fuel-cooled system, sit down and map out system...
Forum: Alternative Engines 02-14-2019, 02:03 PM
Replies: 96
Views: 8,724
Posted By DanH
Now we're talkin' something different. Minor...

Now we're talkin' something different.

Minor note...probably want good filtration between the header and fuel rail, given the circulation through block castings,
Forum: RV-10 02-14-2019, 09:13 AM
Replies: 18
Views: 1,026
Posted By DanH
It's a matter of adding up little improvements...

It's a matter of adding up little improvements here and there. Racing has always been like that. You can find more.

Back in the 80's I had a friend with an identical production racebike. All...
Forum: RV-10 02-14-2019, 07:14 AM
Replies: 18
Views: 1,026
Posted By DanH
Ok, not allowed to tape gaps. Anything in the...

Ok, not allowed to tape gaps. Anything in the rules about sealing them from the inside? Sealant, foam tape, flap seal?

Some gap and fairing joggle drag is external, but some of it is excrescence...
Forum: RV General Discussion/News 02-13-2019, 06:14 PM
Replies: 7
Views: 1,350
Posted By DanH
Aeroshell W100 Plus is an AD oil and already has...

Aeroshell W100 Plus is an AD oil and already has the scuff additive. Like you, I prefer semi-synthetic multigrade, but I know of nothing to prevent a switch to straight weight AD.
Forum: ADS-B 02-13-2019, 03:38 PM
Replies: 109
Views: 4,990
Posted By DanH
Reference please. UPDATE Got an email from a...

Reference please.

UPDATE

Got an email from a buddy who, due to a prior position, is very familiar with the ADS-B program. He suggests the reference in play here may be AC 20-165B, dated 12-07-15,...
Forum: ADS-B 02-13-2019, 09:15 AM
Replies: 109
Views: 4,990
Posted By DanH
Not a Garmin guy, but the question is easy...

Not a Garmin guy, but the question is easy enough. Ground Pin 5 and you'll always be in anonymous mode when squawking 1200. Or put a switch between Pin 5 and ground; with the switch open, you will...
Forum: ADS-B 02-13-2019, 06:09 AM
Replies: 109
Views: 4,990
Posted By DanH
I doubt the average VAF reader is concerned about...

I doubt the average VAF reader is concerned about black helicopters.

These are sport aircraft. Ever do a nice smooth roll in cruise, just for the sheer joy of it? Maybe break into a mock dogfight?...
Forum: RV-12/RV-12iS 02-12-2019, 12:59 PM
Replies: 15
Views: 1,635
Posted By DanH
Actually, large ticket personal property...

Actually, large ticket personal property transactions are moving toward one-price sales. It's something the internet changed.
Forum: Traditional Aircraft Engines 02-11-2019, 06:26 PM
Replies: 33
Views: 2,814
Posted By DanH
Lycoming also has an opinion. Texas and Alabama...

Lycoming also has an opinion. Texas and Alabama both have lots of mornings with crankcase temps below 60F.

https://www.danhorton.net/VAF/Aeroshell%20100%20120%20or%2015W50/oil.JPG
Forum: Traditional Aircraft Engines 02-11-2019, 03:18 PM
Replies: 33
Views: 2,814
Posted By DanH
Ever looked up the kinematic viscosity values for...

Ever looked up the kinematic viscosity values for Aeroshell W100 Plus and Aeroshell 15W-50?

At 40C (104F), they are 200 and 140, the multigrade being less of course. Being less, it pumps easily. ...
Forum: Traditional Aircraft Engines 02-11-2019, 01:04 PM
Replies: 33
Views: 2,814
Posted By DanH
...while others might say save your money. From...

...while others might say save your money.

From the Camguard website (note the test procedure):

https://aslcamguard.com/humidity-cabinet/

However, a simple home test...
Forum: Traditional Aircraft Engines 02-11-2019, 11:57 AM
Replies: 33
Views: 2,814
Posted By DanH
This is one of those "primer questions",...

This is one of those "primer questions", but....

I switched to 15-50 Aeroshell about 500 hours ago, when I realized it was partially synthetic, no small advantage. And it already has the Lyc...
Forum: Temp / Test / Misc. (posts deleted after 2 weeks) 02-11-2019, 07:24 AM
Replies: 11
Views: 2,144
Posted By DanH
I'm pretty sure Vic's regular readers will see...

I'm pretty sure Vic's regular readers will see said catchy phrase, and know where the shirt comes from before seeing the front ;)

Vic, tell Nick I send congratulations.
Forum: Alternative Engines 02-09-2019, 07:10 AM
Replies: 271
Views: 32,981
Posted By DanH
The highest stress on prop blades, propshaft,...

The highest stress on prop blades, propshaft, gearbox, coupler, crank, and engine accessory drives is unlikely be found at 75% or WOT. Nor will it be found at any static throttle position.
Forum: Alternative Engines 02-08-2019, 12:39 PM
Replies: 96
Views: 8,724
Posted By DanH
Ya'll are not crazy. It was originally marketed...

Ya'll are not crazy. It was originally marketed as the "Higgs...
Forum: Propellers 02-08-2019, 10:25 AM
Replies: 71
Views: 12,181
Posted By DanH
It's why the standard for prop certification is a...

It's why the standard for prop certification is a set of strain gauges on the test prop, and a series of inflight loads.

An accurate rate-adjustable strobe will show things about propellers and...
Forum: RV General Discussion/News 02-08-2019, 08:08 AM
Replies: 59
Views: 4,535
Posted By DanH
Steve, quick side note. Recall I built fairly...

Steve, quick side note. Recall I built fairly extensive oil cooler ducting. It's all plain old West 105. The loads are so low so I don't think Tg is a concern; no evidence of a problem after...
Forum: RV General Discussion/News 02-07-2019, 01:40 PM
Replies: 9
Views: 788
Posted By DanH
Any way you shake it, the peak HP numbers will be...

Any way you shake it, the peak HP numbers will be similar enough to make no difference picking a prop.
Forum: RV General Discussion/News 02-07-2019, 09:29 AM
Replies: 9
Views: 788
Posted By DanH
Airflow Performance (FM150, 200, 300), Precision...

Airflow Performance (FM150, 200, 300), Precision (RSA-5 and -10), and AvStar are fuel metering and throttle in one unit, for mechanical constant flow injection. Electronic injections have no...
Forum: RV-10 02-06-2019, 05:00 PM
Replies: 13
Views: 1,140
Posted By DanH
Not something we worry about on our cars.

Not something we worry about on our cars.
Forum: RV General Discussion/News 02-06-2019, 01:39 PM
Replies: 29
Views: 2,083
Posted By DanH
Coating discussion tends toward unsupported...

Coating discussion tends toward unsupported temperature claims.

Let's quantify.

Anyone have actual values (emissivity, absorptivity, reflectivity, transmissivity, etc) for any of these coatings?...
Forum: RV General Discussion/News 02-06-2019, 12:08 PM
Replies: 29
Views: 2,083
Posted By DanH
Welding difficulty is gettin' far from Flyboy...

Welding difficulty is gettin' far from Flyboy intake wraps...I'm just sayin' ;)
Forum: RV-4 02-05-2019, 06:08 PM
Replies: 3
Views: 393
Posted By DanH
An RV-4? Copy Dave...

An RV-4? Copy Dave Anders.

http://www.vansairforce.com/community/showpost.php?p=1313738&postcount=42
Forum: RV General Discussion/News 02-05-2019, 02:00 PM
Replies: 59
Views: 4,535
Posted By DanH
Just imagine some softly rounded bazoombas out in...

Just imagine some softly rounded bazoombas out in front of those inlets. The fact they are made of increasing static pressure need not cool your ardor ;)



Careful with that line of thought. ...
Forum: VAF Classifieds (posts in here deleted after 30 days) 02-05-2019, 08:27 AM
Replies: 1
Views: 625
Posted By DanH
Heavy Duty Gear Legs

Anyone want to equip an RV-6 or RV-7 for rough grass or the bush?

Legs built by Langair years ago for my radial engine biplane project. Intended to accept 500 ft per minute at 1850 lbs, 3184 lbs...
Forum: RV General Discussion/News 02-05-2019, 07:04 AM
Replies: 59
Views: 4,535
Posted By DanH
I switch tubing around. Hey, you asked for cheap...

I switch tubing around. Hey, you asked for cheap ;)



Just finished installing a single differential pressure sensor, but not for ease of use or less installation time (frankly both are worse), but...
Forum: RV-8/8A 02-04-2019, 09:07 PM
Replies: 4
Views: 611
Posted By DanH
Looks great on a 14!

Looks great on a 14!
Forum: RV General Discussion/News 02-04-2019, 09:03 PM
Replies: 59
Views: 4,535
Posted By DanH
Ahh, the Chinese menu dilemma: fast, cheap,...

Ahh, the Chinese menu dilemma: fast, cheap, good...pick any two.

FWIW, I have a row of miniature bulkhead fittings installed in my firewall. Buy a length of 10-32 threaded rod. Cut it into 1-1/2"...
Forum: RV General Discussion/News 02-04-2019, 05:00 PM
Replies: 29
Views: 2,083
Posted By DanH
Methinks there are several concepts being...

Methinks there are several concepts being confabulated.

The original "cold air" intake was simply a bypass, a way to avoid routing the intake air through a bunch of cast intake tubes submerged in...
Forum: Alternative Engines 02-04-2019, 12:07 PM
Replies: 96
Views: 8,724
Posted By DanH
From the Hooper UAV paper linked above: ....in a...

From the Hooper UAV paper linked above:

....in a four-cycle engine all of the oil passes at some time into the high temperature region adjacent to the piston compression rings and is then returned...
Forum: Alternative Engines 02-04-2019, 08:46 AM
Replies: 271
Views: 32,981
Posted By DanH
Charlie, would you care to share his response? ...

Charlie, would you care to share his response?



As noted, I wrote to ask for the values required for torsional design, as spelled out in SGF's own published guidance (copied below). The response...
Forum: Traditional Aircraft Engines 02-04-2019, 07:59 AM
Replies: 44
Views: 5,219
Posted By DanH
What is pin overlap?

What is pin overlap?
Forum: RV-10 02-04-2019, 07:49 AM
Replies: 16
Views: 1,540
Posted By DanH
Rather than band-aid the pump with a cooling...

Rather than band-aid the pump with a cooling shroud, try to determine the actual heat sources and eliminate them.

The problem can be broken down into two categories, (1) heating the fuel before it...
Forum: RV-7/7A 02-02-2019, 06:47 AM
Replies: 30
Views: 2,304
Posted By DanH
Corrected, as in outside the specification, or...

Corrected, as in outside the specification, or corrected as not rich enough to meet your recommendation?
Forum: Places To Fly...Things to See...Things to Eat 01-31-2019, 10:00 AM
Replies: 13
Views: 1,870
Posted By DanH
Big TFR coverage doesn't kick in until 5:30 PM...

Big TFR coverage doesn't kick in until 5:30 PM Sunday. Prior is 1nm radius, apparently over the stadium.

Pancakes are approved.
Forum: RV General Discussion/News 01-31-2019, 09:42 AM
Replies: 14
Views: 3,405
Posted By DanH
Not specifically an aluminum line connected to a...

Not specifically an aluminum line connected to a steel bulkhead fitting. I did do enough burns with steel fittings to know the cabin side can glow red when the front side was subjected to FAA...
Forum: Traditional Aircraft Engines 01-30-2019, 04:59 PM
Replies: 44
Views: 5,219
Posted By DanH
Could be. Same CR and same timing would not...

Could be. Same CR and same timing would not necessarily result in the same cylinder pressure. There are variables like VE, and turbulence, the differences between parallel valve and angle...
Forum: Traditional Aircraft Engines 01-30-2019, 03:59 PM
Replies: 44
Views: 5,219
Posted By DanH
Best I know, Walt is right, same 4.625 stroke...

Best I know, Walt is right, same 4.625 stroke crank.
Forum: Traditional Aircraft Engines 01-30-2019, 12:42 PM
Replies: 44
Views: 5,219
Posted By DanH
Forged in Germany, machined in the US. Rod...

Forged in Germany, machined in the US. Rod journals are 2.125", same as 320, 360, 390, etc. Mains are 2.375" however, while a late model 390 is 2.625".
Forum: Places To Fly...Things to See...Things to Eat 01-30-2019, 09:24 AM
Replies: 13
Views: 1,870
Posted By DanH
Doin' it again....pancakes this...

Doin' it again....pancakes this Saturday!

Weatherman says it should be about 50F at 9am. Not that I mean to insult my northern brothers, subject to unceasing cold, by referencing the moderate...
Forum: RV-7/7A 01-30-2019, 08:16 AM
Replies: 30
Views: 2,304
Posted By DanH
That would be Kyle Day. Kyle has already been...

That would be Kyle Day. Kyle has already been there more than 20 years.
Forum: Alternative Engines 01-29-2019, 03:14 PM
Replies: 271
Views: 32,981
Posted By DanH
That's interesting. Very soft indeed, which...

That's interesting. Very soft indeed, which makes the question "For how many degrees?" It's a pin in a socket, soft only until the pin reaches the edge of the bore. At 25 ft-lbs/deg (1.942...
Forum: Alternative Engines 01-29-2019, 12:50 PM
Replies: 271
Views: 32,981
Posted By DanH
The coupler bushings between the flywheel and the...

The coupler bushings between the flywheel and the gearbox are the ones I had in mind. I suspect the model will suggest a much lower spring rate, and anyway, urethane has too much...
Forum: Alternative Engines 01-29-2019, 11:46 AM
Replies: 271
Views: 32,981
Posted By DanH
Fun...

Fun paper:

https://www.enginehistory.org/members/articles/V-12TV.pdf
Forum: Alternative Engines 01-29-2019, 11:38 AM
Replies: 271
Views: 32,981
Posted By DanH
If I recall correctly, the system requires...

If I recall correctly, the system requires passing through it at every taxi. It's now done with the least possible manifold pressure, rather than shoving the throttle to pass through it...
Forum: RV-7/7A 01-29-2019, 09:13 AM
Replies: 30
Views: 2,304
Posted By DanH
It's a fair point. I don't know if Don designed...

It's a fair point. I don't know if Don designed around standard replacement components, like servo diaphragms, and I wouldn't expect him to tell me. Pretty sure you could substitute any brand of...
Forum: Alternative Engines 01-29-2019, 08:56 AM
Replies: 271
Views: 32,981
Posted By DanH
Yes, and there is no reason to see others go down...

Yes, and there is no reason to see others go down the same road.



A thousand hours of "testing" won't uncover torsional issues if run at RPM outside a resonant range.

Here's an example. Assume...
Forum: RV-7/7A 01-28-2019, 05:39 PM
Replies: 30
Views: 2,304
Posted By DanH
Well, it comes with pick-up-the-phone service...

Well, it comes with pick-up-the-phone service from Don.

I'm not saying there is anything wrong with Avstar, and of course it's only my opinion, and my opinion is no more valid than any other...
Forum: RV-7/7A 01-28-2019, 04:47 PM
Replies: 30
Views: 2,304
Posted By DanH
The AFP FM-200 is longer and has no entry flange....

The AFP FM-200 is longer and has no entry flange. The AFP FM-150 has the same footprint as the Avstar or a Bendix RSA-5, including mount flanges. I seem to recall some builders were having a...
Forum: Alternative Engines 01-27-2019, 09:48 PM
Replies: 271
Views: 32,981
Posted By DanH
Yes, the first one, a "tested" PSRU purchased...

Yes, the first one, a "tested" PSRU purchased from Dave Johnson, Reductions Inc. Remember him? It was a torsional disaster. Seemed like a good idea at the time.



I have removed the gauche posts.
Forum: Electronic Ignition Systems 01-27-2019, 08:58 AM
Replies: 44
Views: 3,337
Posted By DanH
Agree, about 4 HP less. I suspect you can get it...

Agree, about 4 HP less. I suspect you can get it back if you lean just a little.
Forum: Alternative Engines 01-27-2019, 08:48 AM
Replies: 271
Views: 32,981
Posted By DanH
Noble cause? Ross, this is driveline...

Noble cause? Ross, this is driveline engineering, a mature science. Stop encouraging the million monkeys approach* to alternative engine development.

(*Give one million typewriters to one...
Forum: Electronic Ignition Systems 01-27-2019, 07:19 AM
Replies: 44
Views: 3,337
Posted By DanH
Climb CHT reduction is probably the #1 reason to...

Climb CHT reduction is probably the #1 reason to retard timing, lower mechanical stress (due to higher gas pressure at TDC) being #2.



This is a p-V (pressure -volume) diagram for a research engine...
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