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Search: Posts Made By: DanH
Forum: Trip Write-ups Today, 06:36 AM
Replies: 20
Views: 1,554
Posted By DanH
Great read Scott. I'm not sure what percentage...

Great read Scott.

I'm not sure what percentage of today's airports were originally built for war service between '41 and '45, but I suspect it may be a majority. Especially true here in the...
Forum: RV-7/7A Today, 05:47 AM
Replies: 12
Views: 580
Posted By DanH
I cleverly reinforced parts of my tips, notably...

I cleverly reinforced parts of my tips, notably the flat aft areas, with pour-in-place expanding foam. They looked great...until some months later, changes in air pressure caused the foam to puff up...
Forum: RV-3 Yesterday, 03:36 PM
Replies: 10
Views: 598
Posted By DanH
Need a US distributor? I know about little about...

Need a US distributor? I know about little about the car business...;)
Forum: RV-3 Yesterday, 06:20 AM
Replies: 10
Views: 598
Posted By DanH
Hans, that's awesome! One off? Replica of...

Hans, that's awesome! One off? Replica of something? I'm pretty jaded when it comes to cars, but that thing gets me excited.
Forum: RV-14 07-01-2020, 05:57 PM
Replies: 22
Views: 3,356
Posted By DanH
Cool. I want to see pictures of that. What kind...

Cool. I want to see pictures of that.

What kind of dyno do you have?
Forum: Fiberglass 07-01-2020, 05:32 AM
Replies: 50
Views: 3,880
Posted By DanH
When in doubt, refer to the product data sheet. ...

When in doubt, refer to the product data sheet. Don't know about the Omni sealer, or about soaking up topcoat, but there is a note stating K36 must be sealed before spraying DBC black. Point...
Forum: RV General Discussion/News 06-30-2020, 04:20 PM
Replies: 12
Views: 1,701
Posted By DanH
Worth the work to improve, but not a horror...

Worth the work to improve, but not a horror story. As Kyle asked, at what airspeed?



One of golden age NACA papers stated cooling demand was proportional to mass flow. Engines are air pumps, so...
Forum: RV-14 06-30-2020, 04:01 PM
Replies: 22
Views: 3,356
Posted By DanH
I think it's a reasonable choice. The separator...

I think it's a reasonable choice. The separator just saves a little oil.

Evacuators work better if tapped into a single cylinder's headpipe rather than into a tailpipe, assuming you desire all...
Forum: Rocket 06-30-2020, 03:52 PM
Replies: 20
Views: 875
Posted By DanH
I really don't know what VE is typical for a...

I really don't know what VE is typical for a stock Lycoming, and it will change depending on intake style, filter/no filter, etc. I didn't even have VE in my first spreadsheet. 0.9 seems like a...
Forum: Rocket 06-30-2020, 12:24 PM
Replies: 20
Views: 875
Posted By DanH
Calculates as 27.94" for the low approach at 0.9...

Calculates as 27.94" for the low approach at 0.9 VE, still close to the 28" reported. However, something isn't accurate. The predicted 27.94 is an airbox pressure. I assume you are tapping...
Forum: Rocket 06-30-2020, 10:34 AM
Replies: 20
Views: 875
Posted By DanH
The issue is how to generate maximum inlet...

The issue is how to generate maximum inlet pressure, in order to push more air through those restrictions.



We're discussing pressure available prior to reaching the filter, throttle plate,...
Forum: Rocket 06-30-2020, 09:35 AM
Replies: 20
Views: 875
Posted By DanH
Pressure recovery...

Pressure recovery...
Forum: Rocket 06-30-2020, 06:07 AM
Replies: 20
Views: 875
Posted By DanH
Dirty perhaps, but if I assume 2400 RPM, 0.9 VE,...

Dirty perhaps, but if I assume 2400 RPM, 0.9 VE, and the values above, theory predicts 28.01"

So what was the actual RPM?
Forum: Traditional Aircraft Engines 06-29-2020, 12:17 PM
Replies: 15
Views: 1,621
Posted By DanH
Given our primary interest is valve seating, I...

Given our primary interest is valve seating, I don't think hot or cold makes a lot of difference. Just do it the same (hot or cold) every time.
Forum: RV-7/7A 06-28-2020, 09:47 AM
Replies: 26
Views: 2,251
Posted By DanH
Only tour bus drivers must look good to fly...

Only tour bus drivers must look good to fly ;)

Me? I'm too old to give a ****.
Forum: RV-8/8A 06-28-2020, 09:39 AM
Replies: 15
Views: 1,317
Posted By DanH
Carl, if you don't already have it, I've put a...

Carl, if you don't already have it, I've put a copy of the NTPS three-leg spreadsheet here for download:

https://www.danhorton.net/Misc/NTPS_gps-pec.XLS
Forum: RV-8/8A 06-27-2020, 09:16 AM
Replies: 15
Views: 1,317
Posted By DanH
27.3 looks like knots converted to statute, or...

27.3 looks like knots converted to statute, or 23.7 NMPG.

Temperature probe appears to be running warm. Dunno about yesterday, but temperature at 14500 is forecast to be 32F all weekend.

Good...
Forum: RV-7/7A 06-27-2020, 06:07 AM
Replies: 26
Views: 2,251
Posted By DanH
That is a great video. Sounds like Jim is...

That is a great video.

Sounds like Jim is attempting the Hoover Roll, as labeled by Mr. Penner. Bob Hoover was my hero. When he passed on, I got thinking it would be fun to do a short video...
Forum: RV Building Tips/Techniques 06-25-2020, 01:47 PM
Replies: 28
Views: 15,841
Posted By DanH
Not enough filter area.

Not enough filter area.
Forum: Rocket 06-24-2020, 09:47 PM
Replies: 20
Views: 875
Posted By DanH
It's another one of those things for which there...

It's another one of those things for which there is no perfect size.

First plan A, external diffusion.

Assume 2700 RPM, 540 cubic inches, a VE of 0.95, and zero forward airspeed. Velocity...
Forum: Fiberglass 06-22-2020, 09:58 AM
Replies: 50
Views: 3,880
Posted By DanH
You mean primary structure, like spars and ribs? ...

You mean primary structure, like spars and ribs? Picking epoxy for that is above my pay grade. For primary stuff I'd use whatever was specified.
Forum: Fiberglass 06-22-2020, 06:26 AM
Replies: 50
Views: 3,880
Posted By DanH
Agree on the Jeffco (Rhino). Brushed/rolled two...

Agree on the Jeffco (Rhino). Brushed/rolled two coats on a foam/mud turtledeck form a few days ago, and noticed a lot of blush, even in a low humidity shop. But it's...
Forum: RV General Discussion/News 06-22-2020, 06:03 AM
Replies: 8
Views: 1,500
Posted By DanH
Seriously, there are better and worse internal...

Seriously, there are better and worse internal and external shapes, but no such thing as "too large". It would be closer to say "decreasing benefit". Each low Vi/Vo inlet makes its own phantom...
Forum: Traditional Aircraft Engines 06-21-2020, 07:46 PM
Replies: 12
Views: 1,339
Posted By DanH
Not to mention the huge difference between the...

Not to mention the huge difference between the Aeroshell 100's and the 15-50 semi synthetic.
Forum: Fuel Injection Systems 06-20-2020, 06:27 AM
Replies: 5
Views: 408
Posted By DanH
So where exactly would you connect this return...

So where exactly would you connect this return line?
Forum: RV General Discussion/News 06-20-2020, 06:09 AM
Replies: 14
Views: 1,609
Posted By DanH
I imagine the local controllers have a pool...

I imagine the local controllers have a pool going...date and time the first pilot asks "HEY, WHERE IS THE SHOW?"
Forum: Fuel Injection Systems 06-19-2020, 05:18 PM
Replies: 5
Views: 408
Posted By DanH
High wing with wing tanks? Vapor lock is...

High wing with wing tanks?

Vapor lock is primarily the result of heat and pressure reduction, with potential contribution from details like 90 degree fittings, and restrictive fuel piping and...
Forum: RV General Discussion/News 06-18-2020, 09:46 AM
Replies: 8
Views: 1,500
Posted By DanH
It was designed to look good. There is no...

It was designed to look good.

There is no equation which nets the perfect size, and inlet area isn't the whole picture anyway. Your first fundamental choice is between internal diffusion (high...
Forum: RV-14 06-18-2020, 07:30 AM
Replies: 37
Views: 6,108
Posted By DanH
I imagine an RV-14 prop is pretty safe at first...

I imagine an RV-14 prop is pretty safe at first ground contact. As Rob said, a fella would have to hit hard, given a more-or-less level attitude. That's not to say there is a lot of margin. If...
Forum: RV-14 06-17-2020, 03:01 PM
Replies: 37
Views: 6,108
Posted By DanH
Certainly not when pinning a clean roll-on. ...

Certainly not when pinning a clean roll-on. Here, think about the thread title, i.e. "The Rabbit"...rusty pilot, multiple hops.

The 14 has long legs, so I cheerfully admit it would require...
Forum: Temp / Test / Misc. (posts deleted after 2 weeks) 06-17-2020, 08:03 AM
Replies: 33
Views: 3,047
Posted By DanH
That's the spirit. Funny how folks can get more...

That's the spirit.

Funny how folks can get more determined when told they may not be able to do something.

And if you decide it's not for you, really, that's fine. Everyone has things they are...
Forum: RV-14 06-16-2020, 11:09 AM
Replies: 37
Views: 6,108
Posted By DanH
BTW, I second Walt's comment regarding tire...

BTW, I second Walt's comment regarding tire pressure. Pressure in the 30 psi range is a common crutch for shimmy problems, but it doesn't do the tires and tubes any good...in particular with a...
Forum: RV-14 06-16-2020, 08:01 AM
Replies: 37
Views: 6,108
Posted By DanH
Ok, good. In a typical tail-low wheel...

Ok, good.

In a typical tail-low wheel landing, a bounce is the result of too much vertical velocity and/or too much airspeed.

Way back when, in the Cub days, a mentor convinced me to use a...
Forum: RV-10 06-15-2020, 07:16 PM
Replies: 8
Views: 435
Posted By DanH
Larry, that looks great!

Larry, that looks great!
Forum: Temp / Test / Misc. (posts deleted after 2 weeks) 06-15-2020, 05:02 PM
Replies: 33
Views: 3,047
Posted By DanH
No. I enjoyed every minute. Look, if you want...

No. I enjoyed every minute.

Look, if you want encouragement, you can get plenty here. Help, good advice, tips, knowledge...just ask. But if it seems too tough, or too much to learn, well, quit...
Forum: RV-14 06-15-2020, 08:43 AM
Replies: 37
Views: 6,108
Posted By DanH
Bill, perhaps you might tell us about pilot...

Bill, perhaps you might tell us about pilot experience here.
Forum: Electronic Ignition Systems 06-14-2020, 08:09 PM
Replies: 4
Views: 539
Posted By DanH
Replace the sticker, ditch the blast tube, see...

Replace the sticker, ditch the blast tube, see what you get.
Forum: RV Ongoing Maintenance Issues 06-14-2020, 08:23 AM
Replies: 22
Views: 1,489
Posted By DanH
No sketch required. Newton's 2nd law, F = m * a...

No sketch required. Newton's 2nd law, F = m * a

Less m = more a ;)
Forum: RV Ongoing Maintenance Issues 06-14-2020, 05:40 AM
Replies: 22
Views: 1,489
Posted By DanH
Recently dropped 20 lbs. I can scurry across a...

Recently dropped 20 lbs. I can scurry across a little faster now ;)
Forum: Midwest 06-13-2020, 05:14 AM
Replies: 8
Views: 644
Posted By DanH
https://www.sparksaviation.com/

https://www.sparksaviation.com/
Forum: RV Ongoing Maintenance Issues 06-12-2020, 02:49 PM
Replies: 22
Views: 1,489
Posted By DanH
https://www.danhorton.net/Articles/1013_TailWheelT...

https://www.danhorton.net/Articles/1013_TailWheelTuneUp.pd.pdf
Forum: Electronic Ignition Systems 06-12-2020, 02:27 PM
Replies: 101
Views: 17,111
Posted By DanH
No, a parallel valve. It should have responded...

No, a parallel valve. It should have responded to advance better than an angle valve. An angle valve with a base timing of 28 and a full advance of 38 would even less happy, although I'm sure...
Forum: Electronic Ignition Systems 06-12-2020, 10:54 AM
Replies: 101
Views: 17,111
Posted By DanH
Let's assume that data point was an outlier, a...

Let's assume that data point was an outlier, a case of one misinformed individual, or a communication error. And arguably, every P-Mag owner flying without a jumper got the same instructions.

In...
Forum: Electronic Ignition Systems 06-12-2020, 07:36 AM
Replies: 101
Views: 17,111
Posted By DanH
Yes again. If I may add to Mike's...

Yes again.

If I may add to Mike's illustration...

If your EI choice is not switchable between best power and best economy ignition advance schedules, install a best power schedule.

Yes, that...
Forum: Electronic Ignition Systems 06-11-2020, 06:33 PM
Replies: 1
Views: 294
Posted By DanH
That was the plan when announced at OSH last year.

That was the plan when announced at OSH last year.
Forum: Fuel Injection Systems 06-11-2020, 06:30 PM
Replies: 18
Views: 1,102
Posted By DanH
Hans, read...

Hans, read this:

https://www.danhorton.net/Articles/Bendix-and-Beyond%20(1).pdf
Forum: RV Building Tips/Techniques 06-11-2020, 06:27 PM
Replies: 17
Views: 1,985
Posted By DanH
Shop leak testing is a good thing, but realize...

Shop leak testing is a good thing, but realize the real test comes when you G 'em up with 120 lbs of gas in 'em.
Forum: RV-9/9A 06-11-2020, 06:45 AM
Replies: 16
Views: 1,124
Posted By DanH
Sandwiching foam or fiberglass under a plywood or...

Sandwiching foam or fiberglass under a plywood or aluminum floorboard is an iffy deal. One obvious item is trapped water, and wrapping the insulation in plastic won't help.

Insulating the inside of...
Forum: Fuel Injection Systems 06-11-2020, 06:08 AM
Replies: 18
Views: 1,102
Posted By DanH
Based on depth of knowledge... For conventional...

Based on depth of knowledge...

For conventional aircraft constant flow injection, this is the place:

https://airflowperformance.com/

For electronic fuel injection, I'd...
Forum: RV Ongoing Maintenance Issues 06-10-2020, 02:39 PM
Replies: 21
Views: 1,330
Posted By DanH
At what voltage? As noted, a lot of amps...

At what voltage?



As noted, a lot of amps initially would be expected with a lithium iron battery. As for the lead-acid battery, if the alternator's output voltage is normal, I think it was simply...
Forum: RV-7/7A 06-10-2020, 07:28 AM
Replies: 5
Views: 704
Posted By DanH
Gotta be careful with the Kool-Aid. The...

Gotta be careful with the Kool-Aid. The available electronic fuel injection systems merely substitute a mixture twist knob in place of a lever. Sure, you can program one fuel map and leave it there...
Forum: RV General Discussion/News 06-10-2020, 07:22 AM
Replies: 13
Views: 872
Posted By DanH
Square peg, round hole, etc. Build a new one. ...

Square peg, round hole, etc. Build a new one. A leaky plenum lid is useless as a leaky boat.
Forum: Traditional Aircraft Engines 06-10-2020, 07:17 AM
Replies: 22
Views: 1,570
Posted By DanH
Folks have been doing similar silicone/glass...

Folks have been doing similar silicone/glass wraps for a long time.

The above setup looks like 9 oz plain weave filled with ordinary orange Permatex between two sheets of plastic, then placed on the...
Forum: RV-7/7A 06-09-2020, 06:50 AM
Replies: 5
Views: 704
Posted By DanH
Call Ray Lawrence at Kaolin Aviation. Ray was...

Call Ray Lawrence at Kaolin Aviation. Ray was doing one for a customer IIRC.
Forum: RV General Discussion/News 06-09-2020, 05:54 AM
Replies: 28
Views: 2,438
Posted By DanH
The reason for #2 may be based on state...

The reason for #2 may be based on state aeronautical code. It would be in Alabama, where the code spells out different land requirements and licensing for public and family use.

For reference,...
Forum: Fiberglass 06-08-2020, 04:57 PM
Replies: 50
Views: 3,880
Posted By DanH
Probably local advantage. Dixie, The Land That...

Probably local advantage. Dixie, The Land That AC Built. My shop is heavily insulated with 4 ton heat pump. When working composites it never strays more than a few degrees from 75F and 20% RA.
Forum: Traditional Aircraft Engines 06-08-2020, 04:51 PM
Replies: 22
Views: 1,570
Posted By DanH
Airflow is not blocked, just channeled in a...

Airflow is not blocked, just channeled in a specific path between fins.

Our real interest is not maximum flow, but what that mass flow does for us, which is carry away heat. If a fella can arrange...
Forum: Fiberglass 06-08-2020, 04:14 PM
Replies: 50
Views: 3,880
Posted By DanH
Steve, is your shop climate controlled? ...

Steve, is your shop climate controlled? Generally amine blush isn't significant if temperature is stable and humidity is low.
Forum: Traditional Aircraft Engines 06-08-2020, 02:51 PM
Replies: 22
Views: 1,570
Posted By DanH
It's not blocked, merely channeled between fins...

It's not blocked, merely channeled between fins rather than relying on random upper plenum air motion.

Note there are differences when discussing cylinders and heads. I'm not aware of any NACA...
Forum: Traditional Aircraft Engines 06-08-2020, 06:34 AM
Replies: 14
Views: 1,252
Posted By DanH
KIS approach...you have a manifold pressure (21"...

KIS approach...you have a manifold pressure (21" at WOT) and RPM setting (2350) with which you are comfortable running LOP at altitude. So use the throttle; set the same 21" when flying low in the...
Forum: RV Ongoing Maintenance Issues 06-08-2020, 06:14 AM
Replies: 4
Views: 533
Posted By DanH
Regardless of cowl position, the rubber in the...

Regardless of cowl position, the rubber in the photos is mounted wrong.
Forum: Traditional Aircraft Engines 06-08-2020, 06:11 AM
Replies: 22
Views: 1,570
Posted By DanH
So the cylinders are wrapped, or the heads or...

So the cylinders are wrapped, or the heads or wrapped, or both?

Pictures?
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