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Search: Posts Made By: DanH
Forum: RV Ongoing Maintenance Issues Yesterday, 02:18 PM
Replies: 6
Views: 271
Posted By DanH
From Nigel Speedy, one of our professional test...

From Nigel Speedy, one of our professional test pilots...and remember, this was for a parallel valve with higher than stock CR.

Efficiency
An advertised advantage of electronic ignition is that...
Forum: Electronic Ignition Systems Yesterday, 12:27 PM
Replies: 26
Views: 2,688
Posted By DanH
Me too. Whole lot of action going on in those...

Me too. Whole lot of action going on in those empty tubes.
.
Forum: RV Ongoing Maintenance Issues Yesterday, 12:22 PM
Replies: 6
Views: 271
Posted By DanH
Add Surefly and EDIS/Megajolt to your list. ...

Add Surefly and EDIS/Megajolt to your list.

Surefly offers multiple preset fixed timing choices. Megajolt can be set to almost anything desired, with dual maps. I keep one fixed and one variable...
Forum: RV Building Tips/Techniques Yesterday, 12:15 PM
Replies: 17
Views: 1,045
Posted By DanH
News to me. Perhaps you mean your DAR requested...

News to me. Perhaps you mean your DAR requested it? I'm not aware of any such requirement.
Forum: RV Building Tips/Techniques 11-30-2021, 11:08 AM
Replies: 17
Views: 1,045
Posted By DanH
One simple approach is to log the date and time...

One simple approach is to log the date and time completed next to each step in the Vans builder instructions.

And you know where you are, and don't skip steps.
Forum: RV General Discussion/News 11-30-2021, 07:42 AM
Replies: 15
Views: 1,590
Posted By DanH
The check valve at the exhaust tap blocks...

The check valve at the exhaust tap blocks positive exhaust pressure and opens for negative exhaust pressure, thus lowering case pressure. Case pressure below local pressure has a number of benefits,...
Forum: RV General Discussion/News 11-29-2021, 07:44 AM
Replies: 15
Views: 1,590
Posted By DanH
Off topic, but... There should not be a whistle...

Off topic, but...

There should not be a whistle slot in the hose between the separator can and the check valve. It's intended to be a vacuum line.
Forum: Electrical Systems 11-26-2021, 10:11 AM
Replies: 11
Views: 728
Posted By DanH
Yes please, and me too. Classic case...A-65...

Yes please, and me too. Classic case...A-65 Continental, somebody moved the prop just a little, the impulse clicked, and thankfully the three or four revs missed all the guys clustered around the...
Forum: Electronic Ignition Systems 11-26-2021, 05:57 AM
Replies: 189
Views: 53,787
Posted By DanH
https://www.enginebridge.com/product/eiwifi/ http...

https://www.enginebridge.com/product/eiwifi/

https://eicommander.com/

https://emagair.com/eicad/
Forum: RV Building Tips/Techniques 11-25-2021, 07:11 AM
Replies: 17
Views: 1,297
Posted By DanH
Assuming you wish to stick with the conventional...

Assuming you wish to stick with the conventional slot inlet, and given your interest in glasswork, I'd suggest a hard look at Ron Moring's RV8, or Darwin Barrie's Grand Champion RV-7.

Ron's inlet...
Forum: Electronic Ignition Systems 11-25-2021, 07:00 AM
Replies: 26
Views: 2,688
Posted By DanH
FWIW, the 6-cylinder's current Mode Switch...

FWIW, the 6-cylinder's current Mode Switch function is poorly considered.

From the manual:

Start engine with Mode Switch set to VAR (plugs will not fire at cranking speeds in FIX Mode).

It means...
Forum: Traditional Aircraft Engines 11-24-2021, 11:06 AM
Replies: 5
Views: 322
Posted By DanH
The cylinder has thermal mass, so "very quickly"...

The cylinder has thermal mass, so "very quickly" suggests an instrumentation issue. How quick was it?
Forum: Electronic Ignition Systems 11-24-2021, 11:01 AM
Replies: 26
Views: 2,688
Posted By DanH
Walt, is it possible to confirm the 9 degree...

Walt, is it possible to confirm the 9 degree figure, and the MP/RPM/CHT at which the subject began leaning?



...high compression angle valve engines..

The angle valve IO-540 K is the NA Lycoming...
Forum: RV-8/8A 11-24-2021, 06:52 AM
Replies: 17
Views: 1,348
Posted By DanH
As previously described, a circuit interruption...

As previously described, a circuit interruption device on the alternator B-lead is there to open the path from the battery, in the event the B-lead or alternator is shorted to ground.

Consider...
Forum: RV Building Tips/Techniques 11-23-2021, 08:42 AM
Replies: 17
Views: 1,297
Posted By DanH
Mickey has a good point. A plenum is just a...

Mickey has a good point. A plenum is just a sealing device. Leakage means less deltaP and more cooling drag, so sealing is good.

However, more than few plenums are wasted effort because their...
Forum: RV-8/8A 11-23-2021, 07:16 AM
Replies: 17
Views: 1,348
Posted By DanH
Best answer I ever heard was "Most high amp...

Best answer I ever heard was "Most high amp shorts are self-fusing", i.e. they melt open pretty quick when the shorted structure is light gauge metal.

With that in mind, consider a different view. ...
Forum: RV Building Tips/Techniques 11-22-2021, 04:53 PM
Replies: 17
Views: 1,297
Posted By DanH
Larry, Chis did some beautiful work. However,...

Larry, Chis did some beautiful work. However, there is one issue. See the sharp, near 90 degree expansion? Flow separation is near guaranteed, which will reduce pressure recovery.

Compare with...
Forum: RV Building Tips/Techniques 11-19-2021, 06:30 PM
Replies: 20
Views: 1,557
Posted By DanH
Very clever! My compliments sir.

Very clever! My compliments sir.
Forum: RV-10 11-19-2021, 09:57 AM
Replies: 11
Views: 1,063
Posted By DanH
They are a structural fuse, limiting the maximum...

They are a structural fuse, limiting the maximum stress applied to the bracket. A one-piece stop increases the maximum.

Brackets still crack in some cases, likely because their operators didn't...
Forum: RV-10 11-18-2021, 11:20 AM
Replies: 11
Views: 1,063
Posted By DanH
Which just means you better be real diligent...

Which just means you better be real diligent about inspecting for cracks per the SB referenced above.

I've expressed concerns in the past about similar "internal stop" installations on the 2-place...
Forum: RV Building Tips/Techniques 11-17-2021, 09:43 AM
Replies: 37
Views: 2,307
Posted By DanH
Excellent. So what did you pick, and why, and...

Excellent. So what did you pick, and why, and what is your plan?
Forum: RV Building Tips/Techniques 11-17-2021, 09:37 AM
Replies: 37
Views: 2,307
Posted By DanH
Steve, a heads up. When I pushed cowl pressure...

Steve, a heads up. When I pushed cowl pressure up to current levels, inspection showed signs of stress in the firewall/skin flange on each side of the cowl outlet. The Skybolt tabs, being...
Forum: RV Building Tips/Techniques 11-17-2021, 09:15 AM
Replies: 37
Views: 2,307
Posted By DanH
Dude, you want me to Google for you? There are...

Dude, you want me to Google for you?

There are lots of online sources for composite materials. Anyway, this is about education and recreation. Find some examples, do the reading, pick some...
Forum: Traditional Aircraft Engines 11-16-2021, 07:08 AM
Replies: 3
Views: 510
Posted By DanH
Made this seal removal tool years ago. It's just...

Made this seal removal tool years ago. It's just a modified screwdriver. The tool surface against the seal is flat, while the surface against the case is curved to match.
-
Forum: Electrical Systems 11-15-2021, 04:29 PM
Replies: 14
Views: 972
Posted By DanH
Yep. Did a preliminary inspection of a similar...

Yep. Did a preliminary inspection of a similar amphib this weekend, newly acquired by a local fellow. Found a rod end in the elevator linkage with only six #10 threads engaged and no locknut. ...
Forum: RV General Discussion/News 11-15-2021, 04:13 PM
Replies: 13
Views: 1,738
Posted By DanH
Wish I too had an elf to clean those small places...

Wish I too had an elf to clean those small places ;)
Forum: RV General Discussion/News 11-15-2021, 09:35 AM
Replies: 13
Views: 1,738
Posted By DanH
Made more peel ply scrap, followed by loops, and...

Made more peel ply scrap, followed by loops, and rolls, then some careful patrol of the territory.
-
Forum: Electrical Systems 11-15-2021, 06:06 AM
Replies: 14
Views: 972
Posted By DanH
Looking at the picture makes old guys cringe. ...

Looking at the picture makes old guys cringe. Why? Old skin is thin, and those stubs sticking out of the square lock are really sharp.

Buy a good pair of miniature side cutters. Lots of brands....
Forum: RV General Discussion/News 11-14-2021, 10:35 AM
Replies: 53
Views: 4,967
Posted By DanH
Here's an alternate design idea, easily adapted...

Here's an alternate design idea, easily adapted to the task of lifting a tailwheel.

I designed and built this some years ago for my mom. At the time she was still living on her own, and had one of...
Forum: RV General Discussion/News 11-12-2021, 09:40 AM
Replies: 39
Views: 2,630
Posted By DanH
A kit might be nice, but just having a well known...

A kit might be nice, but just having a well known go-to for good stainless is the key, one part or kit.

BTW, are Class 2 threads really that big a deal? I'm guessing 90% of the Lycoming powered EAB...
Forum: RV General Discussion/News 11-12-2021, 09:26 AM
Replies: 39
Views: 2,630
Posted By DanH
Wish I had a picture of a black steel -6 bulkhead...

Wish I had a picture of a black steel -6 bulkhead fitting I removed from an AOG rescue, but it was before cell phones had cameras. The inner bore looked like someone had stuffed it with bits of...
Forum: RV General Discussion/News 11-12-2021, 06:34 AM
Replies: 39
Views: 2,630
Posted By DanH
The net is awash in garbage fittings. If you...

The net is awash in garbage fittings.

If you need to go off the reservation for non-AN stainless steel, I'd suggest Parker or Eaton . Both are reputable manufacturers with a large network of...
Forum: RV-8/8A 11-11-2021, 09:44 PM
Replies: 5
Views: 581
Posted By DanH
You got it.

You got it.
Forum: RV-8/8A 11-11-2021, 12:00 PM
Replies: 5
Views: 581
Posted By DanH
Use MS24694 (AN509) screws with nested dimples. ...

Use MS24694 (AN509) screws with nested dimples. The dimples add strength and stiffness, plus the heads will never bother anyone.

BTW, I'm tall and my legs do contact the towers.
Forum: RV-10 11-11-2021, 11:44 AM
Replies: 11
Views: 1,666
Posted By DanH
Click "Reply", look for the little paperclip at...

Click "Reply", look for the little paperclip at the top of the reply box.



Breather hose routing is the same for any separator can. From breather port to can, always run uphill the whole way. ...
Forum: Electrical Systems 11-11-2021, 09:38 AM
Replies: 17
Views: 1,608
Posted By DanH
Sounds like an internal coil winding short,...

Sounds like an internal coil winding short, lowering resistance, which would explain the heat. However, to kill the battery with the panel master switch open, the short had to have also created a...
Forum: Safety 11-10-2021, 01:53 PM
Replies: 90
Views: 7,412
Posted By DanH
In context here, the solo overhead is no more or...

In context here, the solo overhead is no more or less safe. An overhead formation break can be a problem when lead doesn't see the still distant guy who just turned crosswind to base, and #4, who...
Forum: Traditional Aircraft Engines 11-10-2021, 07:48 AM
Replies: 14
Views: 1,224
Posted By DanH
Sit back and think about the crankcase...

Sit back and think about the crankcase environment. It's complex.

Water is a significant byproduct of combustion, but the vast majority of it goes out the exhaust pipe. The small amount of water...
Forum: Traditional Aircraft Engines 11-09-2021, 06:00 PM
Replies: 14
Views: 1,224
Posted By DanH
First, we don't "burn off" anything in the...

First, we don't "burn off" anything in the crankcase. We do wish to convert any liquid other than oil to vapor so it can leave the crankcase via the breather. Luckily it's easy, because water and...
Forum: RV Ongoing Maintenance Issues 11-08-2021, 04:06 PM
Replies: 1
Views: 411
Posted By DanH
De-greased mine 1045 hours ago, prior to...

De-greased mine 1045 hours ago, prior to installation.
Forum: Traditional Aircraft Engines 11-08-2021, 09:27 AM
Replies: 24
Views: 1,481
Posted By DanH
My theory too, more or less, the big temp swing...

My theory too, more or less, the big temp swing being the cooldown from around 200F. Lot of water in 200F air, so replace it with outside air. Even if high RH, the outside air is (1) holding a lot...
Forum: RV General Discussion/News 11-08-2021, 06:38 AM
Replies: 21
Views: 3,279
Posted By DanH
50 minute run into Mississippi to visit my friend...

50 minute run into Mississippi to visit my friend Joel, who has been working on a project. In this case, it's a whole new home base starting from bare dirt....runway, hangar/shop, and a house, a lot...
Forum: RV General Discussion/News 11-07-2021, 10:35 AM
Replies: 23
Views: 2,327
Posted By DanH
"Hold My Beer"?

"Hold My Beer"?
Forum: Traditional Aircraft Engines 11-07-2021, 09:11 AM
Replies: 24
Views: 1,481
Posted By DanH
Paper is dated 1925. I'd bet sulfur content was...

Paper is dated 1925. I'd bet sulfur content was higher in fuels back then. Current spec for 100LL is 0.05% by mass.

No doubt we can push RH way down. The question is how low it needs to be. ...
Forum: Traditional Aircraft Engines 11-07-2021, 07:30 AM
Replies: 24
Views: 1,481
Posted By DanH
Anyone have data for an actual rate of corrosion...

Anyone have data for an actual rate of corrosion at standard atmosphere (59F) in the presence of water vapor only, no liquid water?

One might argue all the value is in the initial high flow purge,...
Forum: Electronic Ignition Systems 11-07-2021, 05:54 AM
Replies: 9
Views: 644
Posted By DanH
...and EDIS/Megajolt.

...and EDIS/Megajolt.
Forum: Electronic Ignition Systems 11-02-2021, 07:39 AM
Replies: 18
Views: 1,146
Posted By DanH
Well, if no change to mixture, it follows the...

Well, if no change to mixture, it follows the increased drop is a function of lower CR, an interesting point.



Normal. The effective ignition retard moves peak pressure further ATDC, so higher...
Forum: Electronic Ignition Systems 11-01-2021, 10:38 AM
Replies: 18
Views: 1,146
Posted By DanH
Did the rebuild include a servo overhaul, or an...

Did the rebuild include a servo overhaul, or an idle mixture adjustment?
Forum: RV-14 11-01-2021, 06:00 AM
Replies: 13
Views: 2,176
Posted By DanH
If you simply shadow the pipes with strips of...

If you simply shadow the pipes with strips of fiberfrax (see post 9), there is no need to bond it. Fiberfrax is unnecessary elsewhere.
Forum: RV-14 10-30-2021, 12:53 PM
Replies: 8
Views: 1,224
Posted By DanH
Here's a nice illustration of how ignition...

Here's a nice illustration of how ignition advance affects detonation onset, in this case with Swift fuel. Although the numerical values may change with another fuel, all of them will have a similar...
Forum: RV-14 10-30-2021, 08:46 AM
Replies: 8
Views: 1,224
Posted By DanH
I do not think there will be a serious issue, as...

I do not think there will be a serious issue, as the whole point was to develop a drop-in replacement. A lot depends on exactly which new fuel, because they are certainly not all the same,...
Forum: RV-14 10-29-2021, 09:51 AM
Replies: 19
Views: 1,080
Posted By DanH
I like the bracket, as compared to the adels on...

I like the bracket, as compared to the adels on the intake tubes. I know the plans install works, but I hate to see the hose run so close to the exhaust headers.



Let's hope he changed his mind. ...
Forum: RV-8/8A 10-27-2021, 11:07 PM
Replies: 20
Views: 3,704
Posted By DanH
Polished Grove legs. You got it. Remove the...

Polished Grove legs.



You got it. Remove the foam from the inside after.
Forum: RV-8/8A 10-27-2021, 08:50 AM
Replies: 20
Views: 3,704
Posted By DanH
Attached from Hoerner's Fluid Dynamic Drag. If...

Attached from Hoerner's Fluid Dynamic Drag.

If the optimum radius is 4 to 8% of chord, there isn't much virtue in a fat fairing. There may be some virtue in extending the tail of the fairing as it...
Forum: RV-8/8A 10-27-2021, 07:10 AM
Replies: 20
Views: 3,704
Posted By DanH
Not far enough. Throw them in the trash and lay...

Not far enough. Throw them in the trash and lay up your own.

Read Ralph's comment. Finishing time is fundamentally the same for fabricated and store-bought. The difference is time/effort spent on...
Forum: RV Building Tips/Techniques 10-26-2021, 05:58 PM
Replies: 37
Views: 2,307
Posted By DanH
Use plain strips down the sides of the fuselage. ...

Use plain strips down the sides of the fuselage. The scallops can catch the corner of the cowl when you slide it upward into place...paint chips!
Forum: RV Building Tips/Techniques 10-26-2021, 03:12 PM
Replies: 37
Views: 2,307
Posted By DanH
Found a photo Mike. This one has multiple plies...

Found a photo Mike. This one has multiple plies of glass tape on the inside edge. It's not bad, certainly not like some I've seen. Still, it does bulge and I gotta look at it. Oil door too, and...
Forum: RV Building Tips/Techniques 10-26-2021, 02:22 PM
Replies: 37
Views: 2,307
Posted By DanH
I don't know what you read, but I run with high...

I don't know what you read, but I run with high cowl pressure, and adding a few glass plies didn't stiffen my cowl edge as much as I would like. So, for the next one...

Carbon is higher modulus,...
Forum: Electrical Systems 10-26-2021, 07:21 AM
Replies: 16
Views: 1,101
Posted By DanH
The answer to all is "42". Seriously, don't...

The answer to all is "42".

Seriously, don't overthink it. Although there are specific rules for subjects which involve physical laws, the rest is common sense and personal preference.

Yes,...
Forum: Safety 10-25-2021, 08:05 PM
Replies: 33
Views: 7,880
Posted By DanH
Kinda doubt "too heavy" was the root problem. ...

Kinda doubt "too heavy" was the root problem. Have you seen the new Zenith Super Duty?
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Forum: RV-14 10-25-2021, 02:48 PM
Replies: 8
Views: 958
Posted By DanH
True for the "big box" horizontal intake sump on...

True for the "big box" horizontal intake sump on earlier 390 A's and EXP's, as it has a lot of internal volume. The intake manifold volume on the C/D/119's "cold air" package is far smaller. I'd...
Forum: RV General Discussion/News 10-25-2021, 11:58 AM
Replies: 16
Views: 1,960
Posted By DanH
Yours is better than mine! Wow, that's my new...

Yours is better than mine! Wow, that's my new screensaver.
Forum: Fiberglass 10-25-2021, 09:30 AM
Replies: 4
Views: 787
Posted By DanH
A properly prepared scarf joint with appropriate...

A properly prepared scarf joint with appropriate fabric and epoxy.
Forum: RV-8/8A 10-25-2021, 06:02 AM
Replies: 38
Views: 11,863
Posted By DanH
Things are different with big feet and long legs....

Things are different with big feet and long legs. Flying yesterday and got two photos for illustration. These are size 14 hiking boots.

The welded-on pedal sideplates are intended to form a bucket...
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