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Showing results 1 to 64 of 500
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Search: Posts Made By: DanH
Forum: RV Building Tips/Techniques Today, 09:38 AM
Replies: 5
Views: 480
Posted By DanH
Probably plans and parts in due course. One...

Probably plans and parts in due course. One project at a time, and I like to beat things in service a while before taking anyone's money.
Forum: Traditional Aircraft Engines Today, 08:43 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
It was not measured. It was calculated. Exit...

It was not measured. It was calculated.



Exit velocity? Yes, tried a long time ago, but I wasn't sure of the math or method and went on to other interests.
Forum: Traditional Aircraft Engines Today, 06:12 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
I'm running a 10611, same physical size. It...

I'm running a 10611, same physical size. It would be interesting to make some pressure measurements. I don't have anything in the database for an RV-14 cowl.
Forum: Traditional Aircraft Engines Yesterday, 09:54 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
We'll never get there with a flat air cooled...

We'll never get there with a flat air cooled installation, but let's get all we can.



Might be a case of premature pitottemperaturation.
Forum: RV Building Tips/Techniques Yesterday, 09:44 PM
Replies: 5
Views: 480
Posted By DanH
This one scoops up the tailwheel. Two batteries,...

This one scoops up the tailwheel. Two batteries, like David's, same reason. Dual wheelchair motors and a battlebot robot controller, so control is via joystick...steers left and right, instant...
Forum: Traditional Aircraft Engines Yesterday, 09:03 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
No. Clearly this will require the Persian dish...

No. Clearly this will require the Persian dish to explain it properly. There are typically 8 to 10 in our dinner group under the HBC gazebo, and next year your night is Wednesday ;)



Such is life...
Forum: Traditional Aircraft Engines Yesterday, 08:45 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
Close! Dynamic pressure can be thought of as...

Close! Dynamic pressure can be thought of as kinetic energy due to mass and motion. Static pressure + dynamic pressure = total pressure. Static and dynamic can trade back and forth. In the cowl...
Forum: Traditional Aircraft Engines Yesterday, 07:08 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
Here it is calculated. The classic equation...

Here it is calculated. The classic equation is...

0.5 * density in slugs per cubic ft * velocity^2 in ft per second = q in lbs per sq ft

...but to make life easy there are spreadsheets or good...
Forum: Safety Yesterday, 05:49 PM
Replies: 65
Views: 5,655
Posted By DanH
It would move the rudder CG rearward, which is...

It would move the rudder CG rearward, which is probably a very bad idea.
Forum: Traditional Aircraft Engines Yesterday, 12:44 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
Dynamic pressure available due to aircraft...

Dynamic pressure available due to aircraft velocity.
Forum: RV Building Tips/Techniques Yesterday, 06:35 AM
Replies: 190
Views: 155,509
Posted By DanH
Thanks for the clarification. So West and micro...

Thanks for the clarification. So West and micro for shape, followed by a West skim to seal, then sanded, then flown a while.

At painting time, did you scuff the West areas again? Following the...
Forum: RV Building Tips/Techniques 08-17-2022, 04:53 PM
Replies: 190
Views: 155,509
Posted By DanH
But what is the yellow material? Microballoons...

But what is the yellow material? Microballoons are white (glass) or dark red (phenolic). White, and here just a trick of the light?
Forum: RV Building Tips/Techniques 08-17-2022, 12:56 PM
Replies: 190
Views: 155,509
Posted By DanH
Looks like the adhesion loss is in a blend area...

Looks like the adhesion loss is in a blend area between Vans glass and aluminum. The exposed area is sort of yellow in color. What are we looking at there?
.
Forum: Traditional Aircraft Engines 08-17-2022, 10:02 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
Andi is right, as usual. Nice work! Quick review...

Andi is right, as usual. Nice work!

Quick review says it's valid. Are you using the common piccolo setup from the white paper?

What Bill said. Pressure recovery is only one part of the puzzle,...
Forum: Traditional Aircraft Engines 08-17-2022, 09:43 AM
Replies: 30
Views: 1,409
Posted By DanH
The reported conditions are not inconsistent with...

The reported conditions are not inconsistent with normal vernatherm operation in a carbed parallel valve.



I think it's easy to check.

Per a conversation with a Rosta engineer some years ago,...
Forum: RV Ongoing Maintenance Issues 08-17-2022, 09:01 AM
Replies: 18
Views: 1,373
Posted By DanH
Are they the compound rated to -40F?

Are they the compound rated to -40F?
Forum: Traditional Aircraft Engines 08-16-2022, 08:00 AM
Replies: 30
Views: 1,409
Posted By DanH
Apparently it is common, given you read about it...

Apparently it is common, given you read about it a lot:



Brad and Mike seem to suggest the vernatherm could be defective, i.e. perhaps locked in the extended position, or extending prematurely at...
Forum: RV Photo/Video URLs 08-16-2022, 05:59 AM
Replies: 5
Views: 505
Posted By DanH
Made my morning...

Made my morning...
Forum: Traditional Aircraft Engines 08-15-2022, 08:59 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 38,453
Posted By DanH
Hi Pete. Yes, you have recovery. The question...

Hi Pete. Yes, you have recovery. The question is how much, specifically the percentage of available dynamic pressure converted to upper plenum static pressure. DeltaP across the baffles doesn't...
Forum: Traditional Aircraft Engines 08-15-2022, 07:09 PM
Replies: 30
Views: 1,409
Posted By DanH
Gregg, is there some specific technical point you...

Gregg, is there some specific technical point you feel is incorrect, or requires proof?
Forum: Traditional Aircraft Engines 08-15-2022, 02:37 PM
Replies: 30
Views: 1,409
Posted By DanH
Re-read post #5 Again, there is always oil flow...

Re-read post #5

Again, there is always oil flow through the cooler.

A cold vernatherm allows some of the oil through an open bypass, while some flows through the cooler. A hot vernatherm closes...
Forum: Trip Write-ups 08-15-2022, 10:03 AM
Replies: 48
Views: 4,547
Posted By DanH
I want to be Hermann when I grow up.

I want to be Hermann when I grow up.
Forum: RV Building Tips/Techniques 08-15-2022, 10:00 AM
Replies: 190
Views: 155,509
Posted By DanH
I would not run a 1900 RPM buffer on a surface as...

I would not run a 1900 RPM buffer on a surface as highly curved as that inlet lip. Don't feel bad...I too learned it the hard way, buffing cars.

Like Mike said, most body shops just reshoot the...
Forum: Traditional Aircraft Engines 08-15-2022, 09:43 AM
Replies: 30
Views: 1,409
Posted By DanH
"Summer" and "winter" are meaningless in terms of...

"Summer" and "winter" are meaningless in terms of analysis. The conditions of interest are engine type, OAT and power setting. Parallel valve engines without piston squirters require less oil...
Forum: Traditional Aircraft Engines 08-15-2022, 07:12 AM
Replies: 30
Views: 1,409
Posted By DanH
Because there is always some flow through the oil...

Because there is always some flow through the oil cooler, regardless of vernatherm position.

The vernatherm extends when warmed. It is fully extended at about 185F. When it extends, it blocks a...
Forum: Traditional Aircraft Engines 08-14-2022, 06:11 PM
Replies: 30
Views: 1,409
Posted By DanH
Those results suggest your vernatherm is working...

Those results suggest your vernatherm is working very well.
Forum: Traditional Aircraft Engines 08-14-2022, 07:03 AM
Replies: 3
Views: 223
Posted By DanH
Method, theory,...

Method, theory, equipment...

https://www.danhorton.net/Articles/0913_MaintMatters_Compression.pdf
Forum: RV-10 08-13-2022, 05:54 AM
Replies: 40
Views: 5,690
Posted By DanH
Pointless debate. Obvious legalese. Sign, buy...

Pointless debate.

Obvious legalese. Sign, buy the parts, be happy.
Forum: RV General Discussion/News 08-13-2022, 05:28 AM
Replies: 14
Views: 1,340
Posted By DanH
Pixelation makes it hard to be sure, but there...

Pixelation makes it hard to be sure, but there may be a crack between the valve seats.
Forum: Fiberglass 08-10-2022, 04:55 PM
Replies: 26
Views: 1,381
Posted By DanH
Upper fairing has (each side) one at the front...

Upper fairing has (each side) one at the front and two at the rear. Doesn't actually need screws at the front because it hooks around the leading edge of the HS.

The fairing under the HS is just 4...
Forum: Fiberglass 08-10-2022, 09:46 AM
Replies: 26
Views: 1,381
Posted By DanH
Paul, choosing an attack plan here is arguably a...

Paul, choosing an attack plan here is arguably a case of desired result...physical configuration, not quality.

If you're going with rows of screws along the edges and metal close-outs under the HS...
Forum: RV Building Tips/Techniques 08-09-2022, 08:48 AM
Replies: 30
Views: 1,196
Posted By DanH
Yes, higher temperature, held for some period of...

Yes, higher temperature, held for some period of time. No guarantee, but it should work.

The experience basis is the behavior of cowlings subjected to normal engine compartment heating. I have...
Forum: RV-14 08-08-2022, 01:46 PM
Replies: 9
Views: 867
Posted By DanH
Might want to get some temperature measurements...

Might want to get some temperature measurements before choosing to feed water and dirt into the back of an alternator. And since it has fans at both ends, the blast tube is supplying something less...
Forum: Traditional Aircraft Engines 08-08-2022, 11:22 AM
Replies: 14
Views: 675
Posted By DanH
That's where Plane Power was placing blame for...

That's where Plane Power was placing blame for the bearing boss failures; owners and mechanics using the new belt slip spec rather than the used belt spec. I'm just sayin'...
Forum: RV Building Tips/Techniques 08-08-2022, 11:16 AM
Replies: 30
Views: 1,196
Posted By DanH
Glass/epoxy will creep given warm temperatures...

Glass/epoxy will creep given warm temperatures and time. Before making any big moves, just put a cinch strap around the cowl and pull it tight. Check for good fit at the seams with the gap pulled...
Forum: Traditional Aircraft Engines 08-08-2022, 09:11 AM
Replies: 14
Views: 675
Posted By DanH
Alternator tension method below. However, the...

Alternator tension method below. However, the Plane Power has exhibited a failure mode in which the bearing boss in the rear cover gets enlarged, allowing that end of the rotor enough wobble to...
Forum: RV Building Tips/Techniques 08-08-2022, 08:38 AM
Replies: 7
Views: 405
Posted By DanH
Same for manifold pressure. A restrictor in the...

Same for manifold pressure. A restrictor in the primer port fitting prevents that cylinder from going very lean if the hose comes off or is cut.
Forum: RV Building Tips/Techniques 08-08-2022, 08:21 AM
Replies: 30
Views: 1,196
Posted By DanH
No rotation. Just move it straight aft. BTW,...

No rotation. Just move it straight aft.

BTW, When using flox or micro, don't miss the opportunity to rough off excess material when the epoxy cures to the cheese stage...still soft, but no longer...
Forum: RV Building Tips/Techniques 08-08-2022, 06:18 AM
Replies: 30
Views: 1,196
Posted By DanH
The spinner-sized hoop at the front of the cowl...

The spinner-sized hoop at the front of the cowl is structure, and it's stressed more than most folks realize. Dynamic pressure inflates the cowl like a balloon, and total load (available dynamic...
Forum: RV Building Tips/Techniques 08-07-2022, 08:35 PM
Replies: 190
Views: 155,509
Posted By DanH
Dry sanding might do it. I use 800 if I need a...

Dry sanding might do it. I use 800 if I need a heavy initial cut, but it's done wet.
Forum: Traditional Aircraft Engines 08-07-2022, 08:27 PM
Replies: 120
Views: 15,699
Posted By DanH
Actually, there is always some flow through the...

Actually, there is always some flow through the cooler. An extended vernatherm forces all of it through the cooler.
.
Forum: Traditional Aircraft Engines 08-07-2022, 11:34 AM
Replies: 120
Views: 15,699
Posted By DanH
Oil cooler, then to the filter. My notes say...

Oil cooler, then to the filter.



My notes say 12~14, but I don't recall a Lycoming source for the information. Multiple non-OEM sources (Aviation Consumer, Tempest, etc) say the Lycoming adapter...
Forum: RV General Discussion/News 08-07-2022, 09:55 AM
Replies: 53
Views: 8,170
Posted By DanH
Same here, about 2013. I was cleared to the 27...

Same here, about 2013. I was cleared to the 27 green dot, but a runway controller released a departure which looked like a conflict, so I clicked mike and said "Going around". The tower controller...
Forum: Traditional Aircraft Engines 08-07-2022, 07:00 AM
Replies: 120
Views: 15,699
Posted By DanH
Yes, but thank you, I stand corrected. Not all...

Yes, but thank you, I stand corrected. Not all have an anti-drainback valve, including the Tempest 110's I've been using with an AC-style adapter.



The 110 has no pressure relief valve. The...
Forum: RV-14 08-06-2022, 09:48 PM
Replies: 9
Views: 867
Posted By DanH
Without before and after temperature measurement,...

Without before and after temperature measurement, no one knows if they really need a blast tube, or if adding one actually does anything useful.
Forum: Traditional Aircraft Engines 08-06-2022, 09:33 PM
Replies: 120
Views: 15,699
Posted By DanH
Well, best I know, all the Champion and Tempest...

Well, best I know, all the Champion and Tempest filters incorporate an anti-drainback valve.

48108 and 109 filters also have a pressure relief valve, because a lot of Continentals, and several...
Forum: Traditional Aircraft Engines 08-06-2022, 03:16 PM
Replies: 120
Views: 15,699
Posted By DanH
The check valve prevents oil from draining back...

The check valve prevents oil from draining back down the pump passage when the vernatherm cools and opens. The goal is to keep the pump primed, not to keep the filter full. There is no check valve...
Forum: Safety 08-05-2022, 04:05 PM
Replies: 91
Views: 10,792
Posted By DanH
Most of the rudder damage seen here is torsional...

Most of the rudder damage seen here is torsional overstress, not a failure of your gust lock. For rudders fixated with any type of lock which holds the rudder horns, directly or indirectly, the...
Forum: Safety 08-05-2022, 08:14 AM
Replies: 91
Views: 10,792
Posted By DanH
The smaller, stiffer -8 rudders seem to have held...

The smaller, stiffer -8 rudders seem to have held up fine, but still, I think I'll remove the bottom cap for a look at the horn attach area. As for the A-models and zipper rudders, I strongly...
Forum: Safety 08-04-2022, 09:17 AM
Replies: 91
Views: 10,792
Posted By DanH
Knee bone connected to the leg bone....;) If the...

Knee bone connected to the leg bone....;)

If the tailwheel is tied down and centered, the pin is extended into the notch in the steering arm, which is coupled to the rudder by a link or chains. ...
Forum: Safety 08-04-2022, 08:20 AM
Replies: 91
Views: 10,792
Posted By DanH
In my opinion, yes. And we saw twisted and or...

In my opinion, yes. And we saw twisted and or broken examples which were fixated at the top, at the balance mass arm, as well as at the bottom, at the stops or rudder pedals.



Agree, although...
Forum: RV Building Tips/Techniques 08-03-2022, 09:21 PM
Replies: 15
Views: 787
Posted By DanH
I'll say 0.008 for a wet layup, but it's hard to...

I'll say 0.008 for a wet layup, but it's hard to be precise. A high modulus carbon strip inside and outside is the right idea.

The edge shown below had multiple plies of glass tape added to the...
Forum: RV-8/8A 08-03-2022, 06:59 PM
Replies: 20
Views: 2,081
Posted By DanH
Jim, you have it right. New seals would be a big...

Jim, you have it right. New seals would be a big improvement.

The upper cowl tells a lot. I've circled some areas. The red circles show smudge tracks, areas with dirt and soot stains where lots...
Forum: RV General Discussion/News 08-03-2022, 07:32 AM
Replies: 23
Views: 5,349
Posted By DanH
A few more photos from the Social. Took these...

A few more photos from the Social. Took these early, before things got busy shaking barrels and changing taps.

Jesse won the t-shirt contest.

No matter how hard I try, I just can't grin like...
Forum: RV-14 08-02-2022, 08:56 AM
Replies: 18
Views: 2,530
Posted By DanH
Ok, about 30 BTDC at max advance, a good place...

Ok, about 30 BTDC at max advance, a good place for the angle valve when 50 LOP, where the advance compensates for the slower flame speed. Good call.

Still too advanced for ROP mixture, when flame...
Forum: RV General Discussion/News 08-02-2022, 07:44 AM
Replies: 12
Views: 1,607
Posted By DanH
Because it would be just one more special group...

Because it would be just one more special group gumming the works for the rest of us.

Besides, we're not that special, not in the context of performance. There are aircraft types with special...
Forum: RV Ongoing Maintenance Issues 08-01-2022, 02:07 PM
Replies: 423
Views: 1,476,238
Posted By DanH
Makes sense.

Makes sense.
Forum: RV-14 08-01-2022, 01:45 PM
Replies: 18
Views: 2,530
Posted By DanH
Installation is clocked, or set at TDC? ...

Installation is clocked, or set at TDC?



That's because with the jumper out, timing is too far advanced for an angle valve running ROP. You would go faster at around 23 BTDC.
Forum: My RV Build Project 07-31-2022, 06:16 AM
Replies: 9
Views: 1,551
Posted By DanH
Dave, will the turbine require a longer cowl,...

Dave, will the turbine require a longer cowl, with the prop more forward?
Forum: RV General Discussion/News 07-31-2022, 06:11 AM
Replies: 10
Views: 800
Posted By DanH
3/4" behind the tire, so yes, they rub on lots of...

3/4" behind the tire, so yes, they rub on lots of things...hangar tracks, pavement drop-offs, grass and rocks. Every year or two I stuck a small patch on the worn spot. Photo was about 300 hours. ...
Forum: RV General Discussion/News 07-30-2022, 05:49 PM
Replies: 10
Views: 800
Posted By DanH
Zero.... .

Zero....
.
Forum: Midwest 07-29-2022, 11:35 AM
Replies: 111
Views: 31,342
Posted By DanH
Yeah, 6 AM would have been a good time. The guys...

Yeah, 6 AM would have been a good time. The guys who move 'em might not get much say about when they move 'em. Lots of Big Mules...

Must have closed both after I got out. We were parked about 10...
Forum: Midwest 07-29-2022, 10:52 AM
Replies: 111
Views: 31,342
Posted By DanH
That was my point.

That was my point.
Forum: Painting your RV 07-29-2022, 10:35 AM
Replies: 17
Views: 1,598
Posted By DanH
One guy over-squeezing a trailing edge radius...

One guy over-squeezing a trailing edge radius isn't an argument against painting before flight test. He had to paint an aileron he broke. Most of us squeeze 'em without even cracking paint.
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