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Search: Posts Made By: DanH
Forum: Flight Testing Yesterday, 03:58 PM
Replies: 26
Views: 2,601
Posted By DanH
There was a time when I was spending 20 hours a...

There was a time when I was spending 20 hours a week in defense of my airport. Unfortunately, the FAA Airports Compliance Manual was required reading. See Chapter 14, notably...
Forum: RV-7/7A 10-28-2020, 03:02 PM
Replies: 13
Views: 975
Posted By DanH
Generally too stiff for this application. I...

Generally too stiff for this application.

I recall a recent post where someone mentioned cutting a section from an appropriate diameter inner tube. Seems like a sharp idea to me.
Forum: RV General Discussion/News 10-28-2020, 08:31 AM
Replies: 1
Views: 413
Posted By DanH
The new RV-14 drag reduction appears to mirror my...

The new RV-14 drag reduction appears to mirror my RV-8, no surprise given the two airplanes share a similar cooling mass requirement, banishment of the 'coal shovel" exit, and the addition of a...
Forum: RV-7/7A 10-27-2020, 04:45 PM
Replies: 13
Views: 975
Posted By DanH
Two likely reasons. The vernatherm is doing its...

Two likely reasons. The vernatherm is doing its job, regulating to 185F, and/or the 3"D duct is, in effect, the system throttle.
Forum: Traditional Aircraft Engines 10-27-2020, 06:52 AM
Replies: 8
Views: 475
Posted By DanH
The red cap is the oil temperature port in the...

The red cap is the oil temperature port in the above adapter photos.
Forum: Traditional Aircraft Engines 10-27-2020, 05:53 AM
Replies: 8
Views: 475
Posted By DanH
No. All flows pass through the filter, unless...

No. All flows pass through the filter, unless the filter restriction becomes high enough to force open the filter bypass, a different component separate from the vernatherm or viscosity valve....
Forum: Traditional Aircraft Engines 10-26-2020, 05:54 PM
Replies: 8
Views: 475
Posted By DanH
Vernatherm is not strictly required with that...

Vernatherm is not strictly required with that filter adapter. The alternate plan is to install a remotely operated ball valve in one of the oil cooler lines, and keep your "viscosity valve", the...
Forum: RV General Discussion/News 10-26-2020, 03:51 PM
Replies: 6
Views: 624
Posted By DanH
It doesn't, strictly speaking. A rubber lined...

It doesn't, strictly speaking. A rubber lined adel will work IF the correct size is selected. The plain one is more compact, and easier to handle when fumbling with the wire and the little magneto...
Forum: Fuel Injection Systems 10-26-2020, 10:07 AM
Replies: 4
Views: 542
Posted By DanH
Slightly less carb loss (i.e. a bit more manifold...

Slightly less carb loss (i.e. a bit more manifold pressure), and a reputation for excellent support.

For example, can you find a service manual for the Avstar? A comprehensive manual will come with...
Forum: Traditional Aircraft Engines 10-25-2020, 06:44 AM
Replies: 23
Views: 2,440
Posted By DanH
75 ROP vs 150 ROP is unlikely to be an issue...

75 ROP vs 150 ROP is unlikely to be an issue here. Concern for operation in the 50~75 ROP region is based on being near/at the detonation limit, assuming CHT is near 475, hot intake air, poor fuel,...
Forum: RV Building Tips/Techniques 10-24-2020, 06:44 PM
Replies: 12
Views: 452
Posted By DanH
If I may add, look at the specs. Epoxies have...

If I may add, look at the specs. Epoxies have waaaaaaay more tensile strength than proseal.
Forum: RV General Discussion/News 10-24-2020, 06:41 PM
Replies: 19
Views: 2,458
Posted By DanH
All the friends I've made.

All the friends I've made.
Forum: RV Building Tips/Techniques 10-24-2020, 06:45 AM
Replies: 15
Views: 1,397
Posted By DanH
Good point, and your measurements prove it. ...

Good point, and your measurements prove it.



Works for you and me, but the fabrication might be too much for the average builder without a lathe and/or suitable reamer. Within the degree of...
Forum: RV Building Tips/Techniques 10-23-2020, 07:08 AM
Replies: 15
Views: 1,397
Posted By DanH
The line drawing includes a caption stating...

The line drawing includes a caption stating "0.160" Min, Travel Ref". As I read the drawing, it means a cold vernatherm should measure....

3.280 - 0.160 = 3.120"

...from the underside of a...
Forum: RV Building Tips/Techniques 10-23-2020, 06:01 AM
Replies: 38
Views: 3,120
Posted By DanH
I put a single turning vane in this elbow, but it...

I put a single turning vane in this elbow, but it was strictly TLAR design, and I have no idea if it was really needed or not.

The 3-D printed parts are lovely, but a simple glass duct built on a...
Forum: RV Building Tips/Techniques 10-22-2020, 09:29 PM
Replies: 15
Views: 1,397
Posted By DanH
No surprise, but the Rosta factory drawing and SI...

No surprise, but the Rosta factory drawing and SI 1316A seem to be in general agreement.
.
Forum: Traditional Aircraft Engines 10-22-2020, 12:07 PM
Replies: 52
Views: 4,104
Posted By DanH
Good post Sky. Ya'll note the very lean mixture...

Good post Sky.

Ya'll note the very lean mixture with fixed ignition timing, thus the late thetaP which makes it all possible. In theory a variable EI would hold base timing given 27" MP, but we...
Forum: RV Ongoing Maintenance Issues 10-22-2020, 11:26 AM
Replies: 10
Views: 845
Posted By DanH
The best? Oh gee, I dunno...I have a hard drive...

The best? Oh gee, I dunno...I have a hard drive full of them ;)
.
Forum: RV Building Tips/Techniques 10-22-2020, 08:06 AM
Replies: 15
Views: 1,397
Posted By DanH
My compliments Heinrich. That extension vs...

My compliments Heinrich. That extension vs temperature graph is very interesting. And I like your seat resurfacing tool too!
Forum: Traditional Aircraft Engines 10-22-2020, 07:38 AM
Replies: 52
Views: 4,104
Posted By DanH
Believe it or not, that photo was taken with the...

Believe it or not, that photo was taken with the gun pod hanging on the right wing. Beginners luck mostly.



If I may suggest, next time you're in there reset the mag to 23, and the Lightspeed base...
Forum: Traditional Aircraft Engines 10-22-2020, 07:24 AM
Replies: 52
Views: 4,104
Posted By DanH
Again, numbers would help understanding. Skylor...

Again, numbers would help understanding. Skylor said 27". Is Dave running high MP, or cruising at altitude, with low MP? Apple and orange.

Likewise, "engine life" is very general. Like ignition...
Forum: Traditional Aircraft Engines 10-21-2020, 09:00 PM
Replies: 52
Views: 4,104
Posted By DanH
Typically 2~3 knots.

Typically 2~3 knots.
Forum: Traditional Aircraft Engines 10-21-2020, 05:08 PM
Replies: 52
Views: 4,104
Posted By DanH
I have a similar peak vs 50 LOP delta, although...

I have a similar peak vs 50 LOP delta, although both speeds are higher. Photo below was taken this AM on the way to Columbus MS, at peak EGT, solo, half fuel, TAS 185.

Note oil temp and CHT; the...
Forum: Electronic Ignition Systems 10-21-2020, 03:01 PM
Replies: 5
Views: 609
Posted By DanH
Awww...a couple rolls left and right will take...

Awww...a couple rolls left and right will take her mind off it ;)
Forum: Traditional Aircraft Engines 10-21-2020, 02:53 PM
Replies: 52
Views: 4,104
Posted By DanH
"Flipping the switch results in nothing but a...

"Flipping the switch results in nothing but a reduction in FF by about 3 -4 GPH AT THE SAME TAS."

Mike, nothing in the rest of your statement contradicts or expands on the above. Seriously, you're...
Forum: RV Ongoing Maintenance Issues 10-21-2020, 02:28 PM
Replies: 10
Views: 845
Posted By DanH
Great minds and all that rot... .

Great minds and all that rot...
.
Forum: Traditional Aircraft Engines 10-20-2020, 10:01 PM
Replies: 52
Views: 4,104
Posted By DanH
Quite a claim. If you can make the same power on...

Quite a claim. If you can make the same power on 3~4 less GPH merely by advancing the timing, why bother running ROP? It seems you've made "Best Power" mixture entirely superfluous.
Forum: Traditional Aircraft Engines 10-20-2020, 04:21 PM
Replies: 52
Views: 4,104
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 10-20-2020, 04:16 PM
Replies: 52
Views: 4,104
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 10-20-2020, 03:45 PM
Replies: 89
Views: 10,828
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 10-20-2020, 03:37 PM
Replies: 39
Views: 10,073
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 10-20-2020, 03:15 PM
Replies: 52
Views: 4,104
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 10-20-2020, 08:05 AM
Replies: 89
Views: 10,828
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 10-20-2020, 07:39 AM
Replies: 168
Views: 29,503
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 10-20-2020, 07:33 AM
Replies: 52
Views: 4,104
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 10-19-2020, 11:17 AM
Replies: 168
Views: 29,503
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 10-19-2020, 11:14 AM
Replies: 168
Views: 29,503
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: 45
Views: 4,027
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: 45
Views: 4,027
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: 29,503
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: 5,700
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: 39
Views: 10,073
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: 29
Views: 2,116
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: 4,991
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: 4,991
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: 4,991
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: 4,991
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: 15
Views: 2,059
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: 1,177
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: 5
Views: 1,009
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: 1,607
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: 3,610
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: 910
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: 169,441
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: 910
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: 1,418
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: 977
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: 910
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: 1,769
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: 2,941
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: 169,441
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: 2,571
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.
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