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Search: Posts Made By: DanH
Forum: RV-14 Today, 04:18 PM
Replies: 14
Views: 576
Posted By DanH
Got it, thanks. I'm curious...a builder-at-large...

Got it, thanks.

I'm curious...a builder-at-large question. Traditional firewall layouts serve traditional installations. This is EFI, so no engine driven pump. Has anyone thought about moving the...
Forum: Traditional Aircraft Engines Today, 10:12 AM
Replies: 19
Views: 1,554
Posted By DanH
...or angle valve. Nope, I have not tested...

...or angle valve.



Nope, I have not tested additional airflow space on the exhaust side of a cylinder. Go for it, and report back!
Forum: Traditional Aircraft Engines Today, 10:07 AM
Replies: 12
Views: 541
Posted By DanH
No, not in my opinion. If true, it suggests the...

No, not in my opinion. If true, it suggests the cooler isn't large enough. The goal is to have enough cooler to handle the worst case required heat rejection with the airflow available. There is...
Forum: Electrical Systems Today, 06:11 AM
Replies: 251
Views: 12,726
Posted By DanH
Docket...

Docket...
Forum: Electrical Systems Yesterday, 04:42 PM
Replies: 251
Views: 12,726
Posted By DanH
Let's treat the information in the spirit of...

Let's treat the information in the spirit of aviation safety culture...lessons to be learned, "There but for the grace of God", etc.

Too often, "duh" is only obvious in retrospect.

The docket...
Forum: Electrical Systems Yesterday, 02:44 PM
Replies: 251
Views: 12,726
Posted By DanH
The NTSB published a final report on the SQ-12...

The NTSB published a final report on the SQ-12 engine power loss:

https://app.ntsb.gov/pdfgenerator/ReportGeneratorFile.ashx?EventID=20161129X71536&AKey=1&RType=Final&IType=LA

Short version: All...
Forum: RV-14 Yesterday, 01:56 PM
Replies: 14
Views: 576
Posted By DanH
Aluminum bulkhead fittings through the firewall,...

Aluminum bulkhead fittings through the firewall, low and centered. And why the hole? Some kind of heater box?
Forum: Traditional Aircraft Engines Yesterday, 01:51 PM
Replies: 19
Views: 1,554
Posted By DanH
Not behind #4.

Not behind #4.
Forum: RV General Discussion/News 06-16-2018, 05:22 AM
Replies: 28
Views: 3,482
Posted By DanH
Any plan to offer the landing light kit by...

Any plan to offer the landing light kit by itself, no nav or strobe?
Forum: Electronic Ignition Systems 06-15-2018, 09:37 AM
Replies: 160
Views: 17,942
Posted By DanH
The alternator manufacturer did a nice job with...

The alternator manufacturer did a nice job with the regulator design. Whose is it?
Forum: Electronic Ignition Systems 06-15-2018, 07:36 AM
Replies: 160
Views: 17,942
Posted By DanH
Well, ok. As noted previously, the current test...

Well, ok. As noted previously, the current test standard for ordinary automotive applications is >75V. Recent unfortunate events have shown it is possible for some aircraft installations to reach...
Forum: Electronic Ignition Systems 06-14-2018, 05:24 PM
Replies: 160
Views: 17,942
Posted By DanH
Set it up with alternator output about 40 amps...

Set it up with alternator output about 40 amps into that load tester, and then quickly disconnect the tester load.
Forum: RV-6/6A 06-14-2018, 05:15 PM
Replies: 21
Views: 1,687
Posted By DanH
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=141528
Forum: RV-6/6A 06-14-2018, 03:59 PM
Replies: 21
Views: 1,687
Posted By DanH
And where are the seals on the baffle wall behind...

And where are the seals on the baffle wall behind the spinner?
Forum: RV-6/6A 06-14-2018, 07:10 AM
Replies: 21
Views: 1,862
Posted By DanH
Larry and I think so too. It's not really a...

Larry and I think so too.

It's not really a design, but rather a concept. If developed further, yes, I would shrink the inlet scoop body as much as possible, and remove all of the outlet "coal...
Forum: RV General Discussion/News 06-14-2018, 06:14 AM
Replies: 15
Views: 1,421
Posted By DanH
Andy, the optimum top outlet location is not back...

Andy, the optimum top outlet location is not back by the oil door. Think of airfoil pressure plots at high AOA.

Peter Garrison's Melmoth 2 used updraft cooling and top exits. Here, read the first...
Forum: RV General Discussion/News 06-13-2018, 05:49 PM
Replies: 17
Views: 1,910
Posted By DanH
Thanks Ned. Everyone appreciates the nice kit...

Thanks Ned. Everyone appreciates the nice kit you gave away last year; it went to a good place, didn't it?

The sponsor slots are all taken (see post #1), so just grab a beer.

No formal door prize...
Forum: RV General Discussion/News 06-13-2018, 03:34 PM
Replies: 11
Views: 610
Posted By DanH
AC43.13 has a problem. I once spent phone time...

AC43.13 has a problem. I once spent phone time with the responsible FAA office while doing article research, the subject being an obvious deviation from the manufacturer's revised instructions. ...
Forum: RV-6/6A 06-13-2018, 03:16 PM
Replies: 21
Views: 1,862
Posted By DanH
Good report. I suspect freestream pressure is...

Good report. I suspect freestream pressure is lower at an outboard exit, which may explain the lower CHT.

I've tried to encourage a few guys to do it, but they do seem to be a wee bit reluctant...
Forum: Electronic Ignition Systems 06-13-2018, 09:02 AM
Replies: 160
Views: 17,942
Posted By DanH
Let's remember the whole point of the standards...

Let's remember the whole point of the standards is demonstrating immunity to a difficult case.
Forum: Electronic Ignition Systems 06-13-2018, 04:53 AM
Replies: 160
Views: 17,942
Posted By DanH
Probably need to rework the test setup. There...

Probably need to rework the test setup.

There are world-wide automotive standards. The immunity requirements are a lot higher than an 11 volts and 4ms. Examples...

This list dates back to...
Forum: Electronic Ignition Systems 06-12-2018, 10:38 AM
Replies: 195
Views: 60,081
Posted By DanH
Previously I wrote... ...which is true enough,...

Previously I wrote...



...which is true enough, when both ignitions are powered. What I didn't realize was that with one ignition OFF, it apparently becomes a path to ground for the other...
Forum: RV-6/6A 06-12-2018, 08:10 AM
Replies: 21
Views: 1,862
Posted By DanH
Larry, from the standpoint of exhaust system...

Larry, from the standpoint of exhaust system design and fabrication, what do you think about switching to dual outboard exits on an A-model?

http://i66.tinypic.com/n64x76.jpg
Forum: RV Building Tips/Techniques 06-11-2018, 06:30 AM
Replies: 78
Views: 56,027
Posted By DanH
Re-posted photos.

Re-posted photos.
Forum: Traditional Aircraft Engines 06-11-2018, 05:52 AM
Replies: 12
Views: 541
Posted By DanH
Not quantified as pressure loss, but the screen...

Not quantified as pressure loss, but the screen is a large area reduction...like 50%.

Remove screen, fly, report.
Forum: Traditional Aircraft Engines 06-10-2018, 05:25 AM
Replies: 15
Views: 1,537
Posted By DanH
Oooo, I like that! Pretty work. The printed...

Oooo, I like that! Pretty work.

The printed duct form remains inside the carbon shell? I know nothing about 3D printer materials. What sort of temperatures will it stand?

I think your...
Forum: RV-12 06-08-2018, 06:20 AM
Replies: 20
Views: 3,411
Posted By DanH
Ditto and ditto. Sync is mostly about low...

Ditto and ditto. Sync is mostly about low throttle openings. Sync 'em on the idle stops, then sync cable lift.

Back in the day a BMW airhead with CV Bings was synced by ear, and with an index...
Forum: Electrical Systems 06-06-2018, 08:34 AM
Replies: 28
Views: 2,831
Posted By DanH
Deleted for rules violations. Contact DR.

Deleted for rules violations. Contact DR.
Forum: RV General Discussion/News 06-05-2018, 01:03 PM
Replies: 17
Views: 2,472
Posted By DanH
Yeah Bill, you better cough up some serious...

Yeah Bill, you better cough up some serious credit to your helper. Failure to do so might be what Ms. Patti calls a "jewelry offense" ;)
Forum: Southeast 06-05-2018, 04:55 AM
Replies: 12
Views: 578
Posted By DanH
What dates bracket "the season" in...

What dates bracket "the season" in Charleston?
Forum: RV-14 06-05-2018, 04:41 AM
Replies: 12
Views: 3,744
Posted By DanH
Steve, the purpose of the sniffle valve is to...

Steve, the purpose of the sniffle valve is to drain liquids from the intake plenum...oil and/or fuel under normal circumstances, and water if you get a load down the air intake while parked in the...
Forum: Electrical Systems 06-04-2018, 10:57 AM
Replies: 28
Views: 2,831
Posted By DanH
Deleted for rules violations. Contact DR.

Deleted for rules violations. Contact DR.
Forum: Electrical Systems 06-04-2018, 10:31 AM
Replies: 28
Views: 2,831
Posted By DanH
Deleted for rules violations. Contact DR.

Deleted for rules violations. Contact DR.
Forum: Traditional Aircraft Engines 06-04-2018, 09:55 AM
Replies: 19
Views: 1,554
Posted By DanH
I took oil cooler air from behind #3, then ducted...

I took oil cooler air from behind #3, then ducted it from the cowl inlets, then changed the cooler size and went back to taking it behind #3. It was easy to see the effect on oil temps, but there...
Forum: Electrical Systems 06-04-2018, 05:27 AM
Replies: 21
Views: 1,576
Posted By DanH
Like any other, if you're so inclined. Do note...

Like any other, if you're so inclined. Do note that it's installed with labeled LED annunciation.




Old version of Autocad.
Forum: RV General Discussion/News 06-03-2018, 07:00 PM
Replies: 24
Views: 7,930
Posted By DanH
Peter, The fiberfrax in the photo is not adhered...

Peter,
The fiberfrax in the photo is not adhered in any way. It's simply trapped under the self adhesive foil. The foil is not edge sealed. If you finish and paint the inside of the cowl just like...
Forum: Electrical Systems 06-03-2018, 05:42 AM
Replies: 21
Views: 1,576
Posted By DanH
Usual approach is bus->breaker or...

Usual approach is bus->breaker or fuse->push-to-start switch->crank solenoid. Insert this instead, and allow the relay to switch the solenoid coil current. Hide the arming toggle in the location of...
Forum: RV-10 06-01-2018, 08:20 AM
Replies: 42
Views: 2,720
Posted By DanH
Water? ...

Water? WATER????

https://www.facebook.com/notes/trutrak-flight-systems-inc/rv-10-keg-tap-how-to/690542684453314
Forum: RV General Discussion/News 06-01-2018, 06:21 AM
Replies: 10
Views: 1,723
Posted By DanH
Congratulations Chris! Couple notes... Long...

Congratulations Chris!

Couple notes...

Long time ago, a very qualified fellow was kind enough to share FEA models of the rollbar. The assumption made for analysis is that the aircraft might still...
Forum: Electrical Systems 05-31-2018, 02:51 PM
Replies: 28
Views: 2,831
Posted By DanH
Deleted for rules violations. Contact DR.

Deleted for rules violations. Contact DR.
Forum: Traditional Aircraft Engines 05-30-2018, 06:30 PM
Replies: 8
Views: 1,313
Posted By DanH
Same crank, same balance. Recip components...

Same crank, same balance. Recip components matched to 1/2 gram.

The port work is more about flow balance than max power. There is some flow variation between stock cylinders.
Forum: Electrical Systems 05-30-2018, 06:03 PM
Replies: 28
Views: 2,831
Posted By DanH
Thank you! Unfortunately, it seems you too were...

Thank you! Unfortunately, it seems you too were sidetracked into regulators and OV protection by my very poor choice of example. Sorry, my bad.

Let's try again. Forget alternators, regulators,...
Forum: Electrical Systems 05-30-2018, 07:01 AM
Replies: 251
Views: 12,726
Posted By DanH
Thanks Joe. I was aware of NC de-rating (like...

Thanks Joe. I was aware of NC de-rating (like 30/50 and 15/20)....

https://www.delcity.net/images/linedrawings/73980.pdf?v=20170424182940

....but 3 amps NC with a 30 amp NO rating? I had no idea...
Forum: Propellers 05-30-2018, 06:18 AM
Replies: 16
Views: 3,001
Posted By DanH
Wood prop or metal? And what is the streaked...

Wood prop or metal? And what is the streaked material and black material visible through the holes in the first photo? The streaked material seems to be completely filling the big lightening holes
Forum: Electrical Systems 05-30-2018, 06:09 AM
Replies: 251
Views: 12,726
Posted By DanH
Carl's original...

Carl's original link:

https://www.alliedelec.com/schneider-electric-magnecraft-92s7d22d-12/70185034/

I pulled up the data sheet, and there is a spec detail I'm curious about. Take a look at the NC...
Forum: Electrical Systems 05-29-2018, 03:56 PM
Replies: 28
Views: 2,831
Posted By DanH
Ed, the nominal trip points are 16.5V for Plane...

Ed, the nominal trip points are 16.5V for Plane Power, and 16V for B&C. I called 'em.

I used 17V in the above example so we can learn how the EarthX BMS really works.
Forum: Electrical Systems 05-29-2018, 12:45 PM
Replies: 28
Views: 2,831
Posted By DanH
Thank you Kathy. You're right, there does seem...

Thank you Kathy. You're right, there does seem to be some confusion about BMS function.

EarthX nominal full charge voltage is 13.3V, correct? There is one positive post for connecting the battery...
Forum: RV General Discussion/News 05-29-2018, 11:34 AM
Replies: 22
Views: 6,674
Posted By DanH
Same goo here, plus a cable sheath splitting with...

Same goo here, plus a cable sheath splitting with age and really cheap leather finishing which sheds little black bits everywhere.

I've bought three Lightspeeds as new models were introduced, but...
Forum: RV General Discussion/News 05-29-2018, 09:33 AM
Replies: 17
Views: 1,910
Posted By DanH
More than 500 name tags last year. Speaking of...

More than 500 name tags last year.

Speaking of which, the usual reminder...let's keep it RV only please. No bouncer on the door, and no secret password, but we can't take everyone at OSH. Your...
Forum: Alternative Engines 05-29-2018, 08:38 AM
Replies: 59
Views: 8,668
Posted By DanH
Hello Oliver, The Holzer method has been the...

Hello Oliver,

The Holzer method has been the standard for a very long time. I am a non-professional, and not qualified to judge the practical differences between a Holzer tabulation and other...
Forum: Electrical Systems 05-28-2018, 08:28 AM
Replies: 251
Views: 12,726
Posted By DanH
Ahhh. Good subject. Here we have two diagrams. ...

Ahhh. Good subject.

Here we have two diagrams. On the left (best I can tell from the description, circa post 212) is Mike's EFI bus supply architecture. On the right we have the same system,...
Forum: Electrical Systems 05-27-2018, 11:12 AM
Replies: 251
Views: 12,726
Posted By DanH
Uhh, what's a PVI? Yeah, that was the point. ...

Uhh, what's a PVI?



Yeah, that was the point. Other than studying EGTs or pulling breakers, there is no available preflight check of dual ignition function...a normal (and highly accepted)...
Forum: RV General Discussion/News 05-27-2018, 07:45 AM
Replies: 30
Views: 5,034
Posted By DanH
Check this...

Check this out:

https://www.skydesigns.aero/products

(note, click the picture)
Forum: Electrical Systems 05-27-2018, 07:34 AM
Replies: 251
Views: 12,726
Posted By DanH
Chicken ;) Actually Mike hasn't proposed...

Chicken ;)

Actually Mike hasn't proposed anything very radical between the EFI bus and the EFI components. As compared to the standard SDS diagram, he has eliminated only three switches...two coil,...
Forum: Electrical Systems 05-27-2018, 06:40 AM
Replies: 40
Views: 5,277
Posted By DanH
No, you didn't. That's the point. You measured...

No, you didn't. That's the point. You measured exit air temperature, not alternator case or rectifier temperature. Ouote:



and



It's like claiming low CHT based on low cowling exit air...
Forum: Electrical Systems 05-26-2018, 12:15 PM
Replies: 40
Views: 5,277
Posted By DanH
Yes, I know, cooler is better, but without a...

Yes, I know, cooler is better, but without a shroud, does this rear mounted alternator actually run any hotter than the common front mount? The recent alternator poll says a front mounted B&C is...
Forum: RV Ongoing Maintenance Issues 05-26-2018, 12:01 PM
Replies: 12
Views: 1,252
Posted By DanH
No, you do not swap them to equalize indicated...

No, you do not swap them to equalize indicated EGT. You substitute restrictor diameters until they all peak at the same time. The actual EGT values don't matter.

To the OP's question...there is...
Forum: Electrical Systems 05-26-2018, 11:56 AM
Replies: 28
Views: 2,831
Posted By DanH
Deleted, mishap cause had nothing to do with...

Deleted, mishap cause had nothing to do with EarthX. Contact DR.
Forum: Electrical Systems 05-26-2018, 11:41 AM
Replies: 251
Views: 12,726
Posted By DanH
Better show us a wiring diagram. Well, that...

Better show us a wiring diagram.



Well, that firmly places you in the "Does not believe in fault tolerance" column.
Forum: Electrical Systems 05-26-2018, 07:33 AM
Replies: 251
Views: 12,726
Posted By DanH
Power downstream from the EFI/EI bus? I recall...

Power downstream from the EFI/EI bus? I recall Ross saying most of that was pre-wired, I assume per this diagram:

http://www.sdsefi.com/dualecu4.pdf

Set aside the two power supply switches, and...
Forum: RV General Discussion/News 05-26-2018, 06:28 AM
Replies: 17
Views: 1,910
Posted By DanH
Shuttle wagons to the shuttle exchange station by...

Shuttle wagons to the shuttle exchange station by the FAA control tower. Walk 100 yards west on Waukau, out the EAA gate.

Or shuttle to the bus park, maybe 75 yards from 1366 W. Waukau. Detour...
Forum: Electrical Systems 05-25-2018, 09:58 PM
Replies: 251
Views: 12,726
Posted By DanH
In this I'm not hard to...

In this I'm not hard to convince.

http://www.vansairforce.com/community/showpost.php?p=1260818&postcount=106

The auto-switched bus supply is a design exercise, an exploration to see if diodes and...
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