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Search: Posts Made By: DanH
Forum: Traditional Aircraft Engines Today, 04:21 PM
Replies: 23
Views: 860
Posted By DanH
Here's one with AFR (from another Lyc document)...

Here's one with AFR (from another Lyc document) inserted per reference to EGT. 16~17 AFR, yes sir.
.
Forum: Traditional Aircraft Engines Today, 04:16 PM
Replies: 23
Views: 860
Posted By DanH
Everyone's testing agrees with this...

Everyone's testing agrees with this data...including Lycoming. It's straight from the standard "Leaning Relationships" chart. Note the midline of the "Best Economy" range.
Forum: RV-14 Today, 03:45 PM
Replies: 82
Views: 9,193
Posted By DanH
It would control pressure in the lower cowl. ...

It would control pressure in the lower cowl. DeltaP (upper vs lower) dictates mass flow for both cylinder fins and oil cooler.
Forum: RV-10 Today, 03:37 PM
Replies: 35
Views: 9,282
Posted By DanH
Don't know about consensus, but measurement says...

Don't know about consensus, but measurement says the standard firewall aluminum angle extrusions stay cool enough to remain structural with a 2000F test patch going on the forward side.

Wasn't...
Forum: Traditional Aircraft Engines Today, 03:15 PM
Replies: 23
Views: 860
Posted By DanH
ROP and LOP are terms with no dimensions. Might...

ROP and LOP are terms with no dimensions. Might be better to attach numerical values to our descriptions, for example "comparing 150 ROP to 50 LOP".
Forum: RV-14 Today, 08:05 AM
Replies: 82
Views: 9,193
Posted By DanH
Good thread...

Good thread here:

https://vansairforce.net/community/showthread.php?p=1292407&highlight=baffle#post1292407

The big leaker tends to be a gap at the cylinder base. It's hard to see. The baffle tin...
Forum: Electronic Ignition Systems Today, 07:39 AM
Replies: 168
Views: 28,295
Posted By DanH
Actually I had a nice conversation with Scott,...

Actually I had a nice conversation with Scott, who works in the industrial gas turbine world where long term exposure to excess oxidizer at high temperatures is a concern.

As usual, it's about...
Forum: Traditional Aircraft Engines Today, 07:33 AM
Replies: 23
Views: 860
Posted By DanH
"Reference EGT" leaning at WOT for climb. Peak...

"Reference EGT" leaning at WOT for climb.

Peak EGT for fast cruise at altitude (ballpark 183 KTAS on 9 @2400). No worries about LOP, but it's not quite as smooth and it is way too slow.

50 or more...
Forum: Electronic Ignition Systems Yesterday, 11:17 AM
Replies: 168
Views: 28,295
Posted By DanH
Concerned about excess oxidizer? Consider the...

Concerned about excess oxidizer? Consider the diesel.

Caution: Thread drift in progress ;)
Forum: Electronic Ignition Systems Yesterday, 11:14 AM
Replies: 168
Views: 28,295
Posted By DanH
Why a reduced power climb?

Why a reduced power climb?
Forum: RV-12/RV-12iS 10-18-2020, 09:06 AM
Replies: 37
Views: 2,573
Posted By DanH
You must really hate switching tanks ;) If...

You must really hate switching tanks ;)



If enough to break a marriage, the analogy would be poor fabrication and poor component choice.
Forum: RV-12/RV-12iS 10-18-2020, 08:08 AM
Replies: 37
Views: 2,573
Posted By DanH
Bill, I thought the same at one time. However, ...

Bill, I thought the same at one time. However, George Braly said nope, he had tried it with GAMI's 540K, and single ignition was not pro-detonation. On one plug, pressure rise was slow, so the...
Forum: Electronic Ignition Systems 10-17-2020, 04:26 PM
Replies: 168
Views: 28,295
Posted By DanH
More capable how Mike? Some have dual maps, some...

More capable how Mike? Some have dual maps, some offer adjustability, and I'm sure electronic components more reliable...but the question is to advance or not, and how much. I'm hard pressed to see...
Forum: Safety 10-15-2020, 09:58 PM
Replies: 47
Views: 5,354
Posted By DanH
A seatback failure in a Citabria on departure...

A seatback failure in a Citabria on departure killed a mentor and friend back in the 80's, one of the older guys who was always good to us new kids. Pushed the rear stick full aft, and they...
Forum: RV-10 10-15-2020, 05:21 PM
Replies: 35
Views: 9,282
Posted By DanH
Dave, it depends on your goal. If your only...

Dave, it depends on your goal. If your only desire is comfort insulation, then an aluminum cover over a fiberfrax insulator would work just fine.

However, aluminum melts around 1100F, so it's not...
Forum: Electrical Systems 10-15-2020, 02:29 PM
Replies: 24
Views: 1,289
Posted By DanH
Buy or download a copy of "The Aeroelectric...

Buy or download a copy of "The Aeroelectric Connection". Read it twice. At least.

Marc Ausman's "Aircraft Wiring Guide" would also be a good buy.

You can go the the avionics manufacturer's website...
Forum: RV-14 10-15-2020, 07:41 AM
Replies: 24
Views: 4,608
Posted By DanH
BTW, this stuff is near universal. Here's a...

BTW, this stuff is near universal. Here's a chart for a Continental IO550 plotting BSFC against power, CHT, and EGT.

0.60 BSFC is literally off the chart.
.
Forum: RV-14 10-15-2020, 07:31 AM
Replies: 24
Views: 4,608
Posted By DanH
Climb a bit more, still at 2700, but MP now down...

Climb a bit more, still at 2700, but MP now down to 26". BSFC of 0.50 is still hanging in there like a fly on Pence, just short of max power.

I'm posting this one because we can now see peak...
Forum: RV-14 10-15-2020, 07:18 AM
Replies: 24
Views: 4,608
Posted By DanH
Two more graphs, real data. As others have noted...

Two more graphs, real data.

As others have noted here, the 390 manual says 105 lbs of fuel per hour is the minimum for rated power, or 17.5 GPH. 29.92"hg and standard density is assumed in order to...
Forum: RV-14 10-14-2020, 09:25 PM
Replies: 24
Views: 4,608
Posted By DanH
Doesn't matter. Facts are facts. 16 GPH for 160...

Doesn't matter. Facts are facts. 16 GPH for 160 hp is a BSFC of 0.60 assuming 6 lbs/gal. Too fat to develop full power.

Example below, a graph from the FAA dyno. It's a mixture sweep done...
Forum: Fiberglass 10-13-2020, 04:52 PM
Replies: 14
Views: 1,361
Posted By DanH
No bad advice above. Well maybe one. Sorry...

No bad advice above. Well maybe one. Sorry Ralph, but it's not such a good idea to do multiple rounds of fill, sand, fill, sand. It is very difficult to get the micro mix the exact same density...
Forum: Trip Write-ups 10-13-2020, 01:52 PM
Replies: 7
Views: 1,061
Posted By DanH
Humans are the fire ants of the world.

Humans are the fire ants of the world.
Forum: Traditional Aircraft Engines 10-13-2020, 01:45 PM
Replies: 4
Views: 666
Posted By DanH
Depends on how you build...

Depends on how you build it.

https://vansairforce.net/community/showpost.php?p=1282385&postcount=11
Forum: RV-7/7A 10-13-2020, 06:56 AM
Replies: 14
Views: 1,373
Posted By DanH
Pendant comment warning ;) The operative concept...

Pendant comment warning ;)

The operative concept here probably is not damping. A damper removes energy from the system, usually in the form of heat. The only significant mechanism for damping in...
Forum: Safety 10-13-2020, 06:48 AM
Replies: 38
Views: 3,322
Posted By DanH
FWIW, early in the game I was privileged to base...

FWIW, early in the game I was privileged to base with Ed Long (RIP), who you will find listed in Guinness as the world's highest time pilot. I asked Ed about engine failures. In more than 65,000...
Forum: Traditional Aircraft Engines 10-12-2020, 06:32 AM
Replies: 9
Views: 783
Posted By DanH
The rubber can handle the heat in that location,...

The rubber can handle the heat in that location, and a DAR is not likely to condemn the airplane. That said, it will probably wear the holes rapidly, and/or wear the rod.

I hate to see anything...
Forum: Fiberglass 10-11-2020, 07:32 PM
Replies: 121
Views: 168,120
Posted By DanH
Redneck engineering doesn't always require fancy...

Redneck engineering doesn't always require fancy test equipment.

This a a carbon fiber mount for a BRS parachute canister. The "official" mounting method means kluging lengths of steel tube into...
Forum: Traditional Aircraft Engines 10-11-2020, 06:56 PM
Replies: 9
Views: 783
Posted By DanH
Works for me. I use a standard AN960-3 washer in...

Works for me. I use a standard AN960-3 washer in each loop.
Forum: Traditional Aircraft Engines 10-11-2020, 11:11 AM
Replies: 23
Views: 1,201
Posted By DanH
Too often the ground cable from the engine to the...

Too often the ground cable from the engine to the airframe ground point is made of standard aircraft wire in some large gauge. Large gauge aircraft wire is waaaaaay too stiff, the result being loose...
Forum: Electrical Systems 10-11-2020, 08:40 AM
Replies: 17
Views: 837
Posted By DanH
A high resistance at any point in the voltage...

A high resistance at any point in the voltage sense path could indeed be a cause. Intermittents are a PITA, and although I don't generally suggest component replacement based on...
Forum: Traditional Aircraft Engines 10-10-2020, 09:51 PM
Replies: 9
Views: 783
Posted By DanH
I've never understood why everyone ties the...

I've never understood why everyone ties the forward baffle wrap to the aft baffle wrap.

Tie both to the center baffle plate. No interference with the oil drains, simple, light.
.
Forum: Traditional Aircraft Engines 10-10-2020, 04:00 AM
Replies: 20
Views: 1,493
Posted By DanH
The Plane Power brand is a copy of an ND auto...

The Plane Power brand is a copy of an ND auto alternator, made in China by Unipoint, a discount division of Bosch. The only notable change to make it an aircraft alternator is a modified voltage...
Forum: Flight Testing 10-09-2020, 03:40 PM
Replies: 28
Views: 2,612
Posted By DanH
Phillip, think of the 1000 mile cross country as...

Phillip, think of the 1000 mile cross country as two 3 hour legs, followed by down time for a cowl pull and inspection at your Dad's place, followed by two more legs to OSH, followed by plenty of...
Forum: Fiberglass 10-09-2020, 07:18 AM
Replies: 121
Views: 168,120
Posted By DanH
Bill, a little follow up. Added a 5oz twill...

Bill, a little follow up. Added a 5oz twill carbon top ply after bonding in the forward bulkhead and a bunch of other little details, then loaded on a batch of micro and blocked it flat. Note the...
Forum: RV-8/8A 10-09-2020, 07:09 AM
Replies: 13
Views: 2,244
Posted By DanH
If it was easy, it wouldn't be so satisfying when...

If it was easy, it wouldn't be so satisfying when it turns out nice.
Forum: RV Ongoing Maintenance Issues 10-09-2020, 06:53 AM
Replies: 41
Views: 9,807
Posted By DanH
How-to instructions, principles of operation,...

How-to instructions, principles of operation, etc. The how-to is a method of doing the task solo. Personal opinion, but I don't want anyone holding the prop, or even being in the...
Forum: RV General Discussion/News 10-07-2020, 07:54 PM
Replies: 10
Views: 744
Posted By DanH
Listen to Dean. The trim tab is a bad place to...

Listen to Dean. The trim tab is a bad place to add mass.
Forum: RV-14 10-07-2020, 11:57 AM
Replies: 14
Views: 1,162
Posted By DanH
Regarding CO entrainment, note there is no actual...

Regarding CO entrainment, note there is no actual requirement to bring in outside air. Every auto AC includes a "MAX" or "recirculate" control. When selected, the system has no outside air intake. ...
Forum: RV-14 10-07-2020, 11:12 AM
Replies: 5
Views: 657
Posted By DanH
3M FireBarrier 2000 has held up very well, 10...

3M FireBarrier 2000 has held up very well, 10 years now.
Forum: RV-14 10-06-2020, 10:08 AM
Replies: 14
Views: 1,162
Posted By DanH
Adding the exhaust extensions and the big...

Adding the exhaust extensions and the big evaporator housing on the belly has to cost cruise speed.

Climb rate is a function of (1) power excess to that required for level flight at the same speed,...
Forum: Traditional Aircraft Engines 10-06-2020, 04:13 AM
Replies: 5
Views: 866
Posted By DanH
It's a well known fact that no passenger has ever...

It's a well known fact that no passenger has ever remained awake more than 20 minutes in Pete's RV-9. Closing the canopy apparently has the same effect as the sleep pods in the space opera movies. ...
Forum: VAF Classifieds (posts in here deleted after 30 days) 10-05-2020, 07:02 AM
Replies: 4
Views: 412
Posted By DanH
https://www.danhorton.net/Articles/0913_MaintMatte...

https://www.danhorton.net/Articles/0913_MaintMatters_Compression.pdf

Standard 0.040" orifice for a 390.
Forum: Traditional Aircraft Engines 10-04-2020, 07:01 AM
Replies: 26
Views: 3,421
Posted By DanH
Replacing a 2 lb divider spring with a 4 lb...

Replacing a 2 lb divider spring with a 4 lb spring only raises the boiling point by four, maybe five degrees F. It is a relatively ineffective crutch.

The fundamental problem is fuel heating. It...
Forum: Fiberglass 10-02-2020, 04:47 PM
Replies: 8
Views: 616
Posted By DanH
Very interesting. I was under the impression...

Very interesting. I was under the impression that an epoxy allergy manifested itself as a skin problem, like a rash or eczema. Never considered the possibility of epoxy sensitivity causing...
Forum: Safety 10-02-2020, 04:32 PM
Replies: 39
Views: 3,725
Posted By DanH
Nobody wrong here. Can't determine the...

Nobody wrong here. Can't determine the pre-planned action (Jim's view) unless you really do know the system (Carl's view).
Forum: Fuel Injection Systems 10-02-2020, 12:43 PM
Replies: 29
Views: 3,259
Posted By DanH
Actually, I think that one has been discarded in...

Actually, I think that one has been discarded in favor of a better one.
Forum: Fuel Injection Systems 10-02-2020, 12:38 PM
Replies: 29
Views: 3,259
Posted By DanH
Mickey, this fix should be easy, a few 20 minute...

Mickey, this fix should be easy, a few 20 minute work sessions.

Start with a short length of tube, about 1.5" or 2" diameter, and a rectangle of scrap aluminum. Duct tape them together with the...
Forum: Electrical Systems 10-02-2020, 05:49 AM
Replies: 24
Views: 1,471
Posted By DanH
Holding the stick back during start may not be...

Holding the stick back during start may not be entirely necessary, but it sure makes me feel better.

Plenty of sources, but here is the flashing LED indicator I have connected to the start button...
Forum: Fuel Injection Systems 10-02-2020, 05:25 AM
Replies: 29
Views: 3,259
Posted By DanH
An aside for casual readers.. The "RSA-5 class"...

An aside for casual readers..

The "RSA-5 class" fuel controls (Bendix RSA-5 and subsequent Precision Silver Hawk, AFP FM-150, and Avstar equivalents) are physically shorter than the FM-200 seen...
Forum: RV-7/7A 10-01-2020, 03:57 PM
Replies: 6
Views: 601
Posted By DanH
Now that you mention it, I do recall something...

Now that you mention it, I do recall something about a spacer to clear a rotating arm?

EDIT...Here 'ya go: https://vansairforce.net/community/showthread.php?t=159558
Forum: RV-7/7A 10-01-2020, 10:30 AM
Replies: 6
Views: 601
Posted By DanH
The Avstar and AFP FM150 are same length with the...

The Avstar and AFP FM150 are same length with the same flanges.

An FM200 might require a cowl mod.
Forum: Electrical Systems 10-01-2020, 06:50 AM
Replies: 4
Views: 500
Posted By DanH
Not from the alternator, to the alternator. The...

Not from the alternator, to the alternator.

The B-lead connects the battery to the alternator. The goal is to isolate the battery from a shorted B lead.
Forum: Safety 09-30-2020, 08:33 AM
Replies: 39
Views: 3,725
Posted By DanH
Sounds a lot like Vic's story about the guy who...

Sounds a lot like Vic's story about the guy who made a forced landing with fuel in a tank, because he neglected to switch after the engine went quiet.

The electronic control unit in this case wasn't...
Forum: RV-4 09-29-2020, 02:17 PM
Replies: 53
Views: 8,784
Posted By DanH
Be specific. Quote the verbiage from regulation,...

Be specific. Quote the verbiage from regulation, or AC, or other document stating we're required to build to the kit manufacturer's "design spec" or similar, in order to qualify for an EAB AW...
Forum: RV-4 09-29-2020, 12:36 PM
Replies: 53
Views: 8,784
Posted By DanH
Jeff, there isn't any such criteria for EAB...

Jeff, there isn't any such criteria for EAB aircraft.



Many DARs make a sincere effort to inspect and advise regarding best practice. However, they have no "print conformance" responsibility.
Forum: RV-14 09-28-2020, 04:42 PM
Replies: 82
Views: 9,193
Posted By DanH
The vernatherm is designed to be against the seat...

The vernatherm is designed to be against the seat at 185F. Further extension of the wax pellet cylinder compresses the spring. The Rosta drawing says cracking pressure is 60-90 psi at 195F. It...
Forum: RV-14 09-28-2020, 04:24 PM
Replies: 82
Views: 9,193
Posted By DanH
Randy, that's a thought-provoking pair of...

Randy, that's a thought-provoking pair of illustrations.

Consider...if the vernatherm bypass is closed (vernatherm extended firmly enough to seal), the white and green plots should be very close.
Forum: RV-4 09-28-2020, 04:08 PM
Replies: 53
Views: 8,784
Posted By DanH
I understand why Van's would deny parentage. ...

I understand why Van's would deny parentage. However, a serious educational question...isn't this really a matter of (a) spacing, and (b) fastener properties?

Put another way, if the fasteners are...
Forum: RV-14 09-27-2020, 07:33 AM
Replies: 82
Views: 9,193
Posted By DanH
Randy, any chance your sump sensor (installed in...

Randy, any chance your sump sensor (installed in a tapped hole the oil screen cap?) is seeing some radiant heat from the exhaust? Your sump numbers look high.



I suspect it's true. The two flows...
Forum: Traditional Aircraft Engines 09-27-2020, 06:56 AM
Replies: 2
Views: 378
Posted By DanH
The measurement point in the filter adapter is...

The measurement point in the filter adapter is intended to indicate the temperature entering the filter casing, and subsequently the engine.

The two flow paths (oil cooler and direct from sump) mix...
Forum: Electronic Ignition Systems 09-26-2020, 05:47 AM
Replies: 23
Views: 2,624
Posted By DanH
I think you should mount it on the panel where...

I think you should mount it on the panel where everyone can see it!

Seriously, a nice cool place is really desirable for a backup battery.
Forum: RV General Discussion/News 09-26-2020, 05:45 AM
Replies: 13
Views: 1,180
Posted By DanH
Yeah, but 500 of it was spent on the very cool...

Yeah, but 500 of it was spent on the very cool finish scheme!

https://vansairforce.net/community/showthread.php?t=112889
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