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Search: Posts Made By: DanH
Forum: RV General Discussion/News Today, 09:54 AM
Replies: 47
Views: 4,508
Posted By DanH
I fail to understand concerns about a start...

I fail to understand concerns about a start button on the grip. Yes, it needs to be wired through a separate start arming switch. It is trivial to wire the arming circuit so it flashes a big red...
Forum: RV General Discussion/News Yesterday, 06:39 AM
Replies: 2
Views: 234
Posted By DanH
Steve, it's just a standard cabinet lock. I'm...

Steve, it's just a standard cabinet lock.

I'm working from memory here, about six years back, so best I can do is concept...

I think the lock came from Home Depot, similar to this one. The...
Forum: RV General Discussion/News 09-20-2018, 06:11 PM
Replies: 53
Views: 7,999
Posted By DanH
As usual, not much ;) The tests were conducted...

As usual, not much ;)

The tests were conducted with three barrels of Swift fuel, two different 100LL fuels purchased at the local airport, and a specially manufactured minimum specification 100LL. ...
Forum: RV-10 09-20-2018, 09:36 AM
Replies: 3
Views: 606
Posted By DanH
Don't need a James cowl. A builder can put a 14"...

Don't need a James cowl. A builder can put a 14" spinner on anything. Here's one with an otherwise stock RV-8 cowl:

https://www.danhorton.net/VAF/14%20Spinner/RF%20Open.JPG
Forum: RV General Discussion/News 09-19-2018, 05:50 PM
Replies: 39
Views: 4,267
Posted By DanH
Ahhh, thus the difference in sound when they fly...

Ahhh, thus the difference in sound when they fly past the pits.
Forum: RV General Discussion/News 09-19-2018, 10:23 AM
Replies: 39
Views: 4,267
Posted By DanH
Ross, It's racing and you can't tell all, but...

Ross, It's racing and you can't tell all, but what are Andy and Jeff running these days? Put another way, what does it take to run up front in Sport Gold?
Forum: RV General Discussion/News 09-18-2018, 06:54 AM
Replies: 53
Views: 7,999
Posted By DanH
Sorry, brain fart, meant to ask slightly more,...

Sorry, brain fart, meant to ask slightly more, not less; returning to the examples (post 41), again note the absolute EGT values change, but the relationship between delta-from-peak and mixture...
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-17-2018, 08:11 AM
Replies: 11
Views: 1,846
Posted By DanH
Need to lift your leg? Make a fair...

Need to lift your leg? Make a fair offer.

https://www.danhorton.net/Allen%20Fulmer%20RV-7/Stuff/Lift.jpg
Forum: RV General Discussion/News 09-17-2018, 07:52 AM
Replies: 53
Views: 7,999
Posted By DanH
That's a nice tight spread. Do the same check at...

That's a nice tight spread. Do the same check at 8000 or where ever you like to cruise, and if the spread remains that tight, leave the restrictors alone.

Note that all mixture checks should be...
Forum: RV General Discussion/News 09-16-2018, 09:21 PM
Replies: 53
Views: 7,999
Posted By DanH
Perfect. The relationship between delivered...

Perfect.

The relationship between delivered mixture and delta-to-peak is entirely reliable. You're right around 0.085 F/A, or 11.75 to 1 air-fuel, richer than max power. You can plot it yourself...
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-16-2018, 03:23 PM
Replies: 11
Views: 1,846
Posted By DanH
Sold and sold. PM or email with name and address...

Sold and sold. PM or email with name and address please.

I wish I was in Reno.
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-16-2018, 08:56 AM
Replies: 11
Views: 1,846
Posted By DanH
More Good Stuff: MyGoFlight Sport Flex Mount...

More Good Stuff:

MyGoFlight Sport Flex Mount arm, plus a universal cradle for i-Pad Mini and others....
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-15-2018, 08:17 AM
Replies: 11
Views: 1,846
Posted By DanH
Montgomery, Alabama.

Montgomery, Alabama.
Forum: RV General Discussion/News 09-15-2018, 06:06 AM
Replies: 53
Views: 7,999
Posted By DanH
BTW Tom, note the "detonation onset" black tic...

BTW Tom, note the "detonation onset" black tic marks on those plots. They are located on the rich side of peak, between best power and peak EGT.

Most engines make maximum power on mixture leaned to...
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-15-2018, 04:57 AM
Replies: 11
Views: 1,846
Posted By DanH
Ok, Bob takes the O2 system and Marvin takes the...

Ok, Bob takes the O2 system and Marvin takes the Ablescope.

Checks payable to "Joan Fulmer" please.

Who wants a dimpler?
Forum: RV General Discussion/News 09-14-2018, 02:46 PM
Replies: 53
Views: 7,999
Posted By DanH
Ok, the rest of the story... This is a classic...

Ok, the rest of the story...

This is a classic Lycoming document with a few added notes at the bottom. Note the temperature scale at the upper left. It is certainly possible to lower CHT by adding...
Forum: Temp / Test / Misc. (posts deleted after 2 weeks) 09-14-2018, 09:57 AM
Replies: 6
Views: 494
Posted By DanH
Pre-painted white 3105, as used in the truck body...

Pre-painted white 3105, as used in the truck body industry.
Forum: RV General Discussion/News 09-14-2018, 08:30 AM
Replies: 53
Views: 7,999
Posted By DanH
Evaporation makes only a very small contribution...

Evaporation makes only a very small contribution to cooling. An excessively rich mixture delays peak cylinder pressure and lowers combustion temperature. The overall result is a power...
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-13-2018, 08:48 PM
Replies: 11
Views: 1,846
Posted By DanH
Hangar Cleanout

Selling a few things for Allen Fulmer. Probably have more later, so check back often.

SkyOx 12-15 bottle, regulator, and carrying case (SOLD). Website says $567 for new, so first $450 plus...
Forum: RV-8/8A 09-13-2018, 10:52 AM
Replies: 23
Views: 1,797
Posted By DanH
I think it is always reasonable to note such...

I think it is always reasonable to note such loads.
I have not calculated anything, but the assembly is at 800 hours and counting.

Not much difference when compared to the s-link attachment.
Forum: RV General Discussion/News 09-13-2018, 07:08 AM
Replies: 53
Views: 7,999
Posted By DanH
Tom, do yourself a favor and forget about fuel...

Tom, do yourself a favor and forget about fuel flow. You're trying to determine mixture at full throttle. Without a mixture check, both you and the Avstar guy are guessing.

More later, but just...
Forum: RV-8/8A 09-13-2018, 06:15 AM
Replies: 23
Views: 1,797
Posted By DanH
A loose chain, link, or cable generally allows...

A loose chain, link, or cable generally allows the tailwheel to swivel past the release point before the rudder reaches its stop. Bad juju. It should need to stretch a spring to reach the release...
Forum: RV General Discussion/News 09-12-2018, 05:49 PM
Replies: 53
Views: 7,999
Posted By DanH
Did you discuss full throttle, full rich EGT in...

Did you discuss full throttle, full rich EGT in relation to peak EGT?
Forum: RV General Discussion/News 09-12-2018, 03:37 PM
Replies: 24
Views: 2,243
Posted By DanH
Offer him a beer. I mean a good beer. A man once...

Offer him a beer. I mean a good beer. A man once offered me a Bud Light. That airplane never flew.
Forum: RV General Discussion/News 09-11-2018, 04:22 PM
Replies: 53
Views: 7,999
Posted By DanH
Listening to folks insist on fat mixtures for...

Listening to folks insist on fat mixtures for cooling may be Earth's closest equivalent to Vogon poetry.
Forum: RV-8/8A 09-11-2018, 03:52 PM
Replies: 14
Views: 1,118
Posted By DanH
Seriously, there is nothing suspect about a...

Seriously, there is nothing suspect about a standard RV-8 cowl. I've seen the pressure measurements.
Forum: RV General Discussion/News 09-11-2018, 04:33 AM
Replies: 47
Views: 4,508
Posted By DanH
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=159773&highlight=ptt
Forum: RV-8/8A 09-10-2018, 04:27 PM
Replies: 14
Views: 1,118
Posted By DanH
There is a lot in the linked thread (below) about...

There is a lot in the linked thread (below) about low Vi/Vo inlets, but the standard RV-8 cowl also responds very well to reduced exit...
Forum: RV General Discussion/News 09-10-2018, 02:59 PM
Replies: 9
Views: 911
Posted By DanH
Looking Florence in the eye (literally)? Right...

Looking Florence in the eye (literally)?

Right now we have five or six city-owned T-hangars sitting empty at 08A. Call the airport manager, Lynn Weldon, if you wish to ask about using one for a few...
Forum: Fiberglass 09-09-2018, 12:01 PM
Replies: 17
Views: 1,173
Posted By DanH
Finish the inside just like the outside...epoxy...

Finish the inside just like the outside...epoxy seal, epoxy primer, two-part urethane paint. I like white because it shows the location of air and oil leaks.

Sure, nobody sees the inside of the...
Forum: RV-10 09-09-2018, 05:45 AM
Replies: 68
Views: 15,106
Posted By DanH
Looking into it right now. Short version; there...

Looking into it right now. Short version; there is a huge bleed air delta at low MP, and very little at high MP. Luckily, we need at lot of help with atomization at low MP, and not so much at high...
Forum: RV-10 09-08-2018, 06:32 AM
Replies: 68
Views: 15,106
Posted By DanH
Bill's installation is baffled very tightly, and...

Bill's installation is baffled very tightly, and incorporates carefully shaped internal intake expansion. For sure it is not typical.

Based on preliminary data, it appears the engine baffles are...
Forum: RV-10 09-07-2018, 04:47 PM
Replies: 68
Views: 15,106
Posted By DanH
That's an interesting question. Thinking out...

That's an interesting question. Thinking out loud...lets use the pressure delta I posted here...

http://www.vansairforce.com/community/showthread.php?p=1169174

...which was about 7" H20 at 150...
Forum: RV-10 09-07-2018, 10:37 AM
Replies: 68
Views: 15,106
Posted By DanH
Correct. Cylinder and cooler delta would be...

Correct.



Cylinder and cooler delta would be useless in this context. A second round of upper deck measurements with the cooler duct entrance blocked might be illustrative.
Forum: RV-7/7A 09-07-2018, 09:39 AM
Replies: 7
Views: 633
Posted By DanH
Please take this the right way..."the "search"...

Please take this the right way..."the "search" button is your friend.

Short version, yeah, about 38 is common as a compromise between leg shake and tube life. Higher generally means more shake. ...
Forum: RV General Discussion/News 09-07-2018, 09:37 AM
Replies: 47
Views: 2,576
Posted By DanH
The electronics appear to be potted.

The electronics appear to be potted.
Forum: RV General Discussion/News 09-06-2018, 11:21 AM
Replies: 47
Views: 2,576
Posted By DanH
Mark, if you know the source of the photo, be...

Mark, if you know the source of the photo, be sure to contact the builder
and tell him to replace that blue aluminum fitting with a steel fitting. Much bad juju...
Forum: Traditional Aircraft Engines 09-06-2018, 08:29 AM
Replies: 20
Sticky: ENGINE COOLING
Views: 2,613
Posted By DanH
No, you don't. Quite the opposite. With an...

No, you don't. Quite the opposite. With an experimental we are free to make whatever changes we wish to improve cooling performance. Of course, the two-edged sword rule applies; we're equally free...
Forum: Traditional Aircraft Engines 09-06-2018, 07:42 AM
Replies: 205
Views: 104,510
Posted By DanH
Some of you may be familiar with Dan Raymer's...

Some of you may be familiar with Dan Raymer's "Aircraft Design; A Conceptual...
Forum: RV-10 09-05-2018, 08:28 AM
Replies: 11
Views: 779
Posted By DanH
An NL can be re-wired internally to operate...

An NL can be re-wired internally to operate without a separate start contactor. You may still wish to use a relay between the NL's internal contactor windings and any low amp switch used to control...
Forum: RV General Discussion/News 09-05-2018, 06:11 AM
Replies: 12
Views: 989
Posted By DanH
Parker Push-Lok 801, available at your local...

Parker Push-Lok 801, available at your local Parker hose store. With a matching Push-Loc fitting for the breather port, you don't even need a clamp.

https://www.parker.com/literature/4281%20B1.pdf
Forum: RV General Discussion/News 09-04-2018, 03:44 PM
Replies: 57
Views: 7,801
Posted By DanH
Conventional wisdom says carbs do need a...

Conventional wisdom says carbs do need a gascolator.

That said, have you ever seen any water in yours?
Forum: RV-8/8A 09-04-2018, 03:56 AM
Replies: 13
Views: 593
Posted By DanH
Flown it 800 hours now. I can't locate the...

Flown it 800 hours now.

I can't locate the drawing on my hard drive.

No need to guess about mount stiffness; the check is easy. Set up a measurement device. Engage the servo. Pull the stick...
Forum: RV-8/8A 09-03-2018, 09:40 PM
Replies: 13
Views: 593
Posted By DanH
Does it look like this one? I designed it for...

Does it look like this one? I designed it for them about 12 years ago, but I don't know if they subsequently distributed the drawings to RV-8 builders.

That's a stiffness check in the photo. The...
Forum: RV-8/8A 09-03-2018, 05:30 PM
Replies: 23
Views: 2,866
Posted By DanH
Martin, do yourself a big favor and replace or...

Martin, do yourself a big favor and replace or shorten the AN3's in the vicinity of the clamp bolts. Your goal is the "one full thread showing" minimum length. The extra four or five threads...
Forum: RV-10 09-03-2018, 11:33 AM
Replies: 68
Views: 15,106
Posted By DanH
Returning to a thread from a few months...

Returning to a thread from a few months ago....

It's a common belief that an oil cooler inlet somehow steals air from the adjacent rear cylinder, causing it to exhibit a high CHT. I've suggested it...
Forum: Fuel Injection Systems 09-03-2018, 09:20 AM
Replies: 94
Views: 5,722
Posted By DanH
Both arguments have merit, although the parties...

Both arguments have merit, although the parties are not talking about the same loads. Mike is discussing tension/compression due to fore and aft movement of the heads. Robert's adel clamp addition...
Forum: Traditional Aircraft Engines 09-03-2018, 08:24 AM
Replies: 20
Sticky: ENGINE COOLING
Views: 2,613
Posted By DanH
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=37835

http://www.vansairforce.com/community/showthread.php?t=138102

http://www.vansairforce.com/community/showthread.php?t=143064

http://www.v...
Forum: Traditional Aircraft Engines 09-02-2018, 05:48 PM
Replies: 20
Sticky: ENGINE COOLING
Views: 2,613
Posted By DanH
Yep, you're right ;)

Yep, you're right ;)
Forum: RV-10 09-02-2018, 05:46 PM
Replies: 15
Views: 980
Posted By DanH
I really like the piano hinges on the flaps ;)

I really like the piano hinges on the flaps ;)
Forum: RV General Discussion/News 09-01-2018, 09:56 PM
Replies: 30
Views: 1,898
Posted By DanH
Tom, with the pump diaphragm assembly out of the...

Tom, with the pump diaphragm assembly out of the pump body, this one seems obvious.

Both high and low pressure pumps have a seal on the pull rod shaft. Those seals fail by tearing out the center...
Forum: RV General Discussion/News 09-01-2018, 07:51 AM
Replies: 4
Views: 460
Posted By DanH
So draw a centerline and space the screw holes...

So draw a centerline and space the screw holes down from the top. Do it after you've trimmed and straightened the edge of the forward half, as you'll want the screw holes all spaced an equal amount...
Forum: RV-7/7A 09-01-2018, 07:05 AM
Replies: 11
Views: 1,413
Posted By DanH
Nope. Even Continental makes PMA IO-360 angle...

Nope. Even Continental makes PMA IO-360 angle valve cylinders for Lycomings. http://www.continentalmotors.aero/parts/faa-approved.aspx

IO-390 cylinders are currently Lycoming only, but they did...
Forum: Fuel Injection Systems 08-31-2018, 01:54 PM
Replies: 94
Views: 5,722
Posted By DanH
Makes for an interesting comparison. The EFII...

Makes for an interesting comparison.

The EFII injector mount starts with a length of ordinary aluminum tubing. The ID is threaded at both ends, probably with an NPT pipe tap. Then a section is cut...
Forum: Fuel Injection Systems 08-31-2018, 07:08 AM
Replies: 94
Views: 5,722
Posted By DanH
Ross, any chance you could take one apart for us?...

Ross, any chance you could take one apart for us? It appears to be very different from the injector mounts in the EFII photo...a lot more than just a stainless steel nipple.
Forum: RV-10 08-30-2018, 06:42 AM
Replies: 34
Views: 2,930
Posted By DanH
This time last year, the Lycoming warranty...

This time last year, the Lycoming warranty was....

The clock starts running when the engine
is placed in service or 24 months from
shipment by Lycoming, whichever
comes first. It means a builder...
Forum: Trip Write-ups 08-29-2018, 11:47 AM
Replies: 8
Views: 787
Posted By DanH
Pete, did the Maker's Mark guide tell you about...

Pete, did the Maker's Mark guide tell you about the drive-by liquor store?

That's it on the left.

https://assets.makersmark.com/web/section/854/1920x1080/Whisky-Creek-1920x1080.jpg
Forum: Fuel Injection Systems 08-29-2018, 08:51 AM
Replies: 94
Views: 5,722
Posted By DanH
Interesting. The number of sales doesn't tell us...

Interesting. The number of sales doesn't tell us much; this is EAB, where projects drag out for years before completion. Two fails in how many hours?



A quick tour of the customer installation...
Forum: RV General Discussion/News 08-26-2018, 07:42 AM
Replies: 24
Views: 4,040
Posted By DanH
Try...

Try this:

http://www.vansairforce.com/community/showpost.php?p=1113578&postcount=7
Forum: RV-6/6A 08-24-2018, 07:21 AM
Replies: 29
Views: 5,027
Posted By DanH
I can't find any useful conclusions in the data...

I can't find any useful conclusions in the data as presented. Don, got anything that compares TAS for same MP at same altitude, in level flight? Forget RPM.



The flat look is just graph scaling. ...
Forum: RV-8/8A 08-22-2018, 04:00 PM
Replies: 9
Views: 765
Posted By DanH
Yes.......

Yes.......
Forum: RV-8/8A 08-22-2018, 01:34 PM
Replies: 9
Views: 765
Posted By DanH
The issue is not Sika's adhesive strength. The...

The issue is not Sika's adhesive strength.

The issue is Sika's cured hardness. Sika 295 is Shore A 35. 9430 is Shore D 75.

Now consider the exterior laminate plies. Use West 105 as an epoxy...
Showing results 1 to 62 of 500

 
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