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Search: Posts Made By: DanH
Forum: RV General Discussion/News Yesterday, 08:12 PM
Replies: 4
Views: 364
Posted By DanH
Look back to NACA papers in the golden age of...

Look back to NACA papers in the golden age of aircraft piston engine development, and you'll find this nugget...cooling demand is proportional to mass flow.

Since the engine is a fixed displacement...
Forum: RV-4 Yesterday, 08:00 PM
Replies: 8
Views: 381
Posted By DanH
First make sure there is no mechanical contact...

First make sure there is no mechanical contact anywhere which could transfer engine vibration to the airframe. For example, if one of the baffle walls is too tall and contacts the cowl, it can...
Forum: Fuel Injection Systems Yesterday, 07:11 AM
Replies: 4
Views: 293
Posted By DanH
Right. If the boost pump will reliably prime and...

Right. If the boost pump will reliably prime and make pressure (which is typically measured downstream of the engine driven pump), you're good.

Ya know, one of the advantages of answering questions...
Forum: Tools 05-14-2022, 11:17 PM
Replies: 24
Views: 2,716
Posted By DanH
Third and final of the trio, a 42" Pexto slip...

Third and final of the trio, a 42" Pexto slip roll.

Love that ancient extra chunky grease ;)
.
Forum: RV Ongoing Maintenance Issues 05-14-2022, 10:24 PM
Replies: 10
Views: 669
Posted By DanH
Cleanable AFP filter has zero annual cost, and...

Cleanable AFP filter has zero annual cost, and better, you can inspect what is in it.
Forum: RV-14 05-14-2022, 05:42 AM
Replies: 9
Views: 835
Posted By DanH
Mine the same.

Mine the same.
Forum: Fuel Injection Systems 05-14-2022, 05:38 AM
Replies: 4
Views: 293
Posted By DanH
It is possible, thus the good folks at AFP quite...

It is possible, thus the good folks at AFP quite reasonably insert a CYA warning. It's impossible for the pump supplier to predict or be responsible for the behavior of all possible fuel systems,...
Forum: RV General Discussion/News 05-13-2022, 06:06 PM
Replies: 26
Views: 2,078
Posted By DanH
Many past posts, and I don't want to hijack the...

Many past posts, and I don't want to hijack the thread. Short version...rudder should hit the stop without unlocking the tailwheel. An unlock should require tapping a brake. Moving the forward...
Forum: RV General Discussion/News 05-13-2022, 09:30 AM
Replies: 26
Views: 2,078
Posted By DanH
An eyebolt with a few spacing washers at the...

An eyebolt with a few spacing washers at the rudder horn drops the cable assembly below the bottom rudder cap at full deflection. Might not need that on a -6, but it's needed on the -8 when the...
Forum: Traditional Aircraft Engines 05-12-2022, 06:50 PM
Replies: 4
Views: 279
Posted By DanH
Given typical engine baffling, the cowl exit is...

Given typical engine baffling, the cowl exit is the system throttle. So yes, more exit area will allow more mass flow.

That said, there are many factors which can contribute to high CHT. You may...
Forum: Traditional Aircraft Engines 05-12-2022, 01:10 PM
Replies: 4
Views: 279
Posted By DanH
You can find authors who insist on some...

You can find authors who insist on some particular ratio, but it's nonsense.

Inlet/outlet claims are based on area. However, reality says an inlet may be a low velocity ratio type, or a high...
Forum: RV General Discussion/News 05-12-2022, 06:31 AM
Replies: 26
Views: 2,078
Posted By DanH
The bent wire kind? They can be safety wired. ...

The bent wire kind? They can be safety wired. Or given a flotation test and replaced with:...
Forum: RV General Discussion/News 05-11-2022, 05:05 PM
Replies: 26
Views: 1,424
Posted By DanH
Dug around in the can stack. This stuff (photo...

Dug around in the can stack.

This stuff (photo below) has been down 15 years and shows no wear. I tried it after someone on a homebuilt forum said their employer was using it on loading docks, and...
Forum: RV General Discussion/News 05-11-2022, 08:57 AM
Replies: 26
Views: 1,424
Posted By DanH
Somewhere in the process decide if the shop will...

Somewhere in the process decide if the shop will be "show" or "go".

Flooring is a good example. Mine sees the whole spectrum...cutting, grinding, welding, woodwork, painting, fabric cover,...
Forum: RV Building Tips/Techniques 05-11-2022, 06:24 AM
Replies: 15
Views: 1,814
Posted By DanH
Forget nutserts for this job. Wait until after...

Forget nutserts for this job. Wait until after paint and permanently attach the necessary mass.

This is a stack of primed and painted steel plates attached with five 5/32 SS pulled rivets.
.
Forum: RV General Discussion/News 05-10-2022, 05:33 PM
Replies: 18
Views: 2,791
Posted By DanH
It's beautiful. I like polished aluminum...if...

It's beautiful.

I like polished aluminum...if it's not my airplane ;)

Most of my RV weekend time was spent cleaning, buffing, and waxing paint, and yes, polishing aluminum...thankfully gear legs...
Forum: RV General Discussion/News 05-09-2022, 08:52 PM
Replies: 18
Views: 2,791
Posted By DanH
Holy cow, when did that happen? Congratulations!

Holy cow, when did that happen? Congratulations!
Forum: RV Building Tips/Techniques 05-08-2022, 08:32 PM
Replies: 16
Views: 1,091
Posted By DanH
Re adhesive heat shrink, I don't think the...

Re adhesive heat shrink, I don't think the primary intent is environmental sealing. A butt splice can be sealed. Fast-on and ring terminals often remain open at the terminal end.

As noted...
Forum: RV-8/8A 05-08-2022, 10:10 AM
Replies: 33
Views: 15,595
Posted By DanH
Don't think mine were ever in this thread, but...

Don't think mine were ever in this thread, but for you, no problem!
.
Forum: RV Building Tips/Techniques 05-08-2022, 08:34 AM
Replies: 16
Views: 1,091
Posted By DanH
At $5 each? My goodness... Here's a link to...

At $5 each? My goodness...

Here's a link to uninsulated brazed barrel butt connectors, at $5 per hundred:

https://www.waytekwire.com/item/30260/Molex-19215-0009-Standard-Butt-Connector-/

Another...
Forum: Fiberglass 05-07-2022, 07:35 AM
Replies: 28
Views: 2,511
Posted By DanH
Yep. For those who don't know the name, check...

Yep.



For those who don't know the name, check out Ken Scott's article...

https://www.smithsonianmag.com/air-space-magazine/barnstorming-the-beltway-12169194/
Forum: Fiberglass 05-06-2022, 07:17 AM
Replies: 28
Views: 2,511
Posted By DanH
Certainly for some. Let's showcase an example....

Certainly for some.

Let's showcase an example. Dave Howe recently posted about an insurance rate jump after 20 years with no incidents. Twenty years ago, RV's were not tab A, slot B, Rockets...
Forum: Fiberglass 05-05-2022, 05:40 AM
Replies: 28
Views: 2,511
Posted By DanH
Larry learns new skills with every attempt at...

Larry learns new skills with every attempt at creating a custom part. It doesn't matter if the part is ultimately rejected; even failures teach something. The best airplanes often have a pile of...
Forum: RV-8/8A 05-05-2022, 05:16 AM
Replies: 6
Views: 734
Posted By DanH
What Carl said. Build a cover for the rear stick...

What Carl said. Build a cover for the rear stick well and run the hose to a good eyeball vent there.

No cover creates a control jam risk.
.
Forum: Traditional Aircraft Engines 05-04-2022, 07:08 PM
Replies: 21
Views: 1,520
Posted By DanH
A few pages from Lycoming Flyer:...

A few pages from Lycoming Flyer:

https://www.danhorton.net/Misc/Lycoming%20Flyer%20Oversquare.pdf
Forum: Traditional Aircraft Engines 05-04-2022, 11:58 AM
Replies: 21
Views: 1,520
Posted By DanH
I was amused to see your post appear when I hit...

I was amused to see your post appear when I hit send. Great minds and all that rot...



The ~vertical line around 29" MP is simply WOT manifold pressure at sea level if the blue knob was pulled to...
Forum: Safety 05-04-2022, 11:25 AM
Replies: 10
Views: 1,500
Posted By DanH
I've attached one of the craziest storm stories...

I've attached one of the craziest storm stories ever. Believed to be a microburst, but who knows?
-
Forum: Traditional Aircraft Engines 05-04-2022, 08:35 AM
Replies: 21
Views: 1,520
Posted By DanH
That's what it says. However, see the empty text...

That's what it says. However, see the empty text block?

In the mid 2000's, the 390 was a Lycoming kit motor sold through a few selected engine shops. Lycoming published a very thin operating...
Forum: RV General Discussion/News 05-03-2022, 06:52 AM
Replies: 31
Views: 2,806
Posted By DanH
I'm gonna put facial recognition in my next one. ...

I'm gonna put facial recognition in my next one. Nobody will be ugly enough to steal my airplane.
Forum: Traditional Aircraft Engines 05-03-2022, 06:38 AM
Replies: 5
Views: 953
Posted By DanH
I have a spare intake tube I intend to drill for...

I have a spare intake tube I intend to drill for a temperature probe. Point is, we need not guess.

The key feature of most "cold air" manifolds isn't cold air. It's an enlarged mounting flange to...
Forum: Job Board 05-01-2022, 12:15 PM
Replies: 7
Views: 844
Posted By DanH
Architect, steel building, South Carolina

I'd like to build a hangar home just east of Aiken. The proposed design exceeds 5000 sq ft of "gross floor area" as defined by the building code, so Aiken County requires plans drawn and stamped by...
Forum: RV General Discussion/News 05-01-2022, 11:31 AM
Replies: 2
Views: 538
Posted By DanH
Bill, assuming folks want to come watch, is the...

Bill, assuming folks want to come watch, is the field open for arrivals all day on Saturday, or is the field typically closed by a NOTAM with times?
Forum: RV General Discussion/News 05-01-2022, 10:29 AM
Replies: 37
Views: 2,853
Posted By DanH
Not sayin' it must be done a particular way, but...

Not sayin' it must be done a particular way, but the standard setup used for the database has two piccolo tubes in the upper, and two in the lower, each pair plumbed together, and arranged fore and...
Forum: RV General Discussion/News 05-01-2022, 08:52 AM
Replies: 37
Views: 2,853
Posted By DanH
Previously I said "Let's accept the numbers as...

Previously I said "Let's accept the numbers as accurate". Bad assumption. Calculate the available dynamic pressure based on reported altitude, temperature and TAS, then compare to reported upper...
Forum: RV General Discussion/News 05-01-2022, 08:03 AM
Replies: 37
Views: 2,853
Posted By DanH
Don't be fooled by the high exit air temperature....

Don't be fooled by the high exit air temperature. The CHT's are also high and OAT is low, so epsilons are pretty much in the average range for a parallel valve. Given the four conditions above, we...
Forum: RV Building Tips/Techniques 04-29-2022, 09:52 AM
Replies: 21
Views: 1,488
Posted By DanH
Difference in loss through the forest of tubes,...

Difference in loss through the forest of tubes, wires, and hoses, vs loss through a duct would be very difficult to quantify, given everyone's engine compartment is a unique mess.

What is not hard...
Forum: RV Building Tips/Techniques 04-28-2022, 06:49 PM
Replies: 10
Views: 502
Posted By DanH
Given hardness to resist wear was the real...

Given hardness to resist wear was the real interest, readily available 4130 was the better choice. It's an air-hardening steel. Heat it, quench it, and you get high hardness.
Forum: RV General Discussion/News 04-27-2022, 05:27 PM
Replies: 37
Views: 2,853
Posted By DanH
The other common leak is the rear baffle wall, at...

The other common leak is the rear baffle wall, at the short un-finned section at the base of the cylinder.
Forum: RV-10 04-27-2022, 10:30 AM
Replies: 29
Views: 6,044
Posted By DanH
You will not save any money compared to the 540. ...

You will not save any money compared to the 540. If successful, it's a near guaranteed $50~75K hit in resale value. If unsuccessful, you buy both Honda and Lycoming firewall forwards.

Really want...
Forum: Fiberglass 04-27-2022, 09:06 AM
Replies: 28
Views: 2,511
Posted By DanH
Security contractor for a certain large,...

Security contractor for a certain large, frequently obtuse government/industry joint operation.

https://vansairforce.net/community/showthread.php?t=173170
Forum: RV General Discussion/News 04-27-2022, 08:41 AM
Replies: 37
Views: 2,853
Posted By DanH
Bulb sender should work, but for the record, the...

Bulb sender should work, but for the record, the LM34 works with anything from 5 to 20 volts, and the meter is just a handheld VOM, something we all have in the toolbox. It's nice to be able to...
Forum: Fiberglass 04-27-2022, 08:30 AM
Replies: 28
Views: 2,511
Posted By DanH
Actually not much carving. I rarely cut with...

Actually not much carving. I rarely cut with anything more complicated than a hacksaw blade or hand saw. It's mostly sanding. Make templates when necessary.
.
Forum: Fiberglass 04-27-2022, 08:24 AM
Replies: 28
Views: 2,511
Posted By DanH
Etc.......

Etc.......
Forum: Fiberglass 04-27-2022, 08:16 AM
Replies: 28
Views: 2,511
Posted By DanH
Or just carve a finished mold and spend half the...

Or just carve a finished mold and spend half the time for a better part.

Composites Rule #1: Time spent on quality molds and forms pays significant dividends in weight and finish.
.
Forum: RV General Discussion/News 04-26-2022, 09:40 AM
Replies: 37
Views: 2,853
Posted By DanH
Easy as pie. Buy a few LM34AH-ND sensors. ...

Easy as pie. Buy a few LM34AH-ND sensors. Solder one to the end of a three wire cable. I use three wire shielded just to have the shield braid serve as armor. Make it long enough to move anywhere...
Forum: RV-10 04-26-2022, 07:19 AM
Replies: 29
Views: 6,044
Posted By DanH
So do I. That said, an RV-10 is a terrible...

So do I. That said, an RV-10 is a terrible choice. Experimenting should not include three passengers, and pilot survival is a whole lot more likely with a lower stall speed, kinetic energy being a...
Forum: Electrical Systems 04-26-2022, 07:02 AM
Replies: 19
Views: 1,121
Posted By DanH
Looks like end gussets (1990) were done, but no...

Looks like end gussets (1990) were done, but no pedal gussets (1998).

https://www.vansaircraft.com/service-information-and-revisions/sb-98-03-1/

Looks like a brake fluid leak too. And please,...
Forum: Tools 04-25-2022, 06:02 AM
Replies: 24
Views: 2,716
Posted By DanH
Start by separating every part from every part. ...

Start by separating every part from every part. The big chunks went back on the trailer and were hauled to a sandblasting shop. Smaller stuff got a pass through my bead blast cabinet after...
Forum: RV General Discussion/News 04-25-2022, 05:40 AM
Replies: 37
Views: 2,853
Posted By DanH
Ok, let's accept the numbers as accurate. You...

Ok, let's accept the numbers as accurate. You have enough deltaP at all airspeeds. Congratulate yourself, because being left with plenty of lower cowl residual pressure after the baffle drop is a...
Forum: RV General Discussion/News 04-24-2022, 05:53 PM
Replies: 37
Views: 2,853
Posted By DanH
Paul, what are you using as a static source for...

Paul, what are you using as a static source for your measurements? And could you describe the probe used for the plenum pressure?
Forum: Tools 04-23-2022, 09:53 PM
Replies: 24
Views: 2,716
Posted By DanH
Before and after. Whole lot of heavy lifting...

Before and after. Whole lot of heavy lifting between those photos...
.
Forum: RV-14 04-23-2022, 06:29 AM
Replies: 5
Views: 501
Posted By DanH
Parts Question

Please confirm or deny...

The tabs and doublers indicated below are tailpipe hangars, only used with the early version of the RV-14? They are deleted if building the dual exhaust -119 version with...
Forum: My RV Build Project 04-22-2022, 07:25 AM
Replies: 38
Views: 4,664
Posted By DanH
Scott, if concerned with vibration you may wish...

Scott, if concerned with vibration you may wish to re-think this mount.

Of the six available degrees of freedom, the white silicone cushions only one, vertical, aligned with the bolt axis. I say...
Forum: RV Building Tips/Techniques 04-21-2022, 07:04 AM
Replies: 14
Views: 987
Posted By DanH
Won't hurt any kind of decent paint. I've peeled...

Won't hurt any kind of decent paint. I've peeled plenty aluminum foil tape from both the inside and outside of the cowl.
Forum: RV Building Tips/Techniques 04-20-2022, 07:17 AM
Replies: 14
Views: 987
Posted By DanH
No need for a large area of fiberfrax. Just...

No need for a large area of fiberfrax. Just shadow the pipes. In strips, nothing is needed to hold the fiberfrax except the aluminum foil cover.

In general, the adhesive on foils and tapes always...
Forum: Tools 04-19-2022, 05:39 PM
Replies: 25
Views: 2,047
Posted By DanH
Today's progress. Major parts sandblasted,...

Today's progress. Major parts sandblasted, primed, sprayed blue. Keep those ideas coming. I'll be working on the jaw inserts soon enough.

A bit slower that the shear. Everything here weighs a...
Forum: RV Building Tips/Techniques 04-19-2022, 06:57 AM
Replies: 21
Views: 1,488
Posted By DanH
Which is unlikely. Remember, cooling drag=...

Which is unlikely.

Remember, cooling drag= mass x loss of velocity. To cut cooling drag, design to reduce the quantity of air flowing through the system, or increase its exit velocity, or...
Forum: Tools 04-18-2022, 08:33 PM
Replies: 25
Views: 2,047
Posted By DanH
Rain gutter...good idea! Just aluminum sheet...

Rain gutter...good idea!



Just aluminum sheet typical for light aircraft. These restored tools will have it easy compared to some of the abuse they got in former lives. Sort of like most old...
Forum: Tools 04-16-2022, 09:50 AM
Replies: 25
Views: 2,047
Posted By DanH
Thanks guys. Sounds like there isn't much to...

Thanks guys. Sounds like there isn't much to gain over spray coatings and waxes, so I'll just go that way and be happy.
Forum: RV Building Tips/Techniques 04-15-2022, 05:11 AM
Replies: 21
Views: 1,488
Posted By DanH
A cooler exit duct is useless if it does not...

A cooler exit duct is useless if it does not extend all the way to a low pressure area. In fact, it's probably worse, as it adds skin friction.

As our own Steve Smith explained to me, with a...
Forum: Tools 04-14-2022, 07:46 PM
Replies: 25
Views: 2,047
Posted By DanH
Surface Treatment For Steel

Brain trust question...

The strips in the photo are the steel edges for the lip and apron on an 8 ft sheet metal brake. Painting them is probably not going to be satisfactory in the long term, as...
Forum: Places To Fly...Things to See...Things to Eat 04-14-2022, 12:51 PM
Replies: 22
Views: 1,774
Posted By DanH
Hands down, the most important camping gear is an...

Hands down, the most important camping gear is an eyemask and some earplugs.

Sunday usually has a large beer trading session at the HBC pavilion. Bring a contribution. Contribute slop and you...
Forum: Alternative Engines 04-14-2022, 06:41 AM
Replies: 27
Views: 5,512
Posted By DanH
It is indeed interesting. I suspect most...

It is indeed interesting.

I suspect most builders don't grasp the full extent of this conversion. The link below will take you to a Kitplanes story about the prior installation, the Continental...
Forum: Tools 04-13-2022, 05:47 PM
Replies: 11
Views: 474
Posted By DanH
When I built the shop, I went with short,...

When I built the shop, I went with short, oversize ducts, and installed a double size intake plenum box under the heat pump's indoor unit...which allows a big filter. The result is a lot of air...
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