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Showing results 1 to 64 of 500
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Search: Posts Made By: DanH
Forum: Alternative Engines Today, 09:37 AM
Replies: 90
Views: 9,167
Posted By DanH
Complete dimensions in the catalog, see below. A...

Complete dimensions in the catalog, see below. A #12 has 4 lobes at 90 degrees.

Selection is the usual balanced compromise. As you know, it's not really a matter of Shore hardness, but rather,...
Forum: Alternative Engines Yesterday, 07:11 PM
Replies: 90
Views: 9,167
Posted By DanH
That input spline is not some SAE standard? Sure...

That input spline is not some SAE standard? Sure would be nice to use a clamped L-LOC.



Four.
Forum: RV Ongoing Maintenance Issues Yesterday, 06:29 AM
Replies: 14
Views: 793
Posted By DanH
I have an app on my android phone called...

I have an app on my android phone called "Resonance". Joel Graber told me about it. I think it was intended to survey floor vibration in architecture, but it works pretty well in the airplane. ...
Forum: Traditional Aircraft Engines 12-02-2022, 08:30 AM
Replies: 5
Views: 265
Posted By DanH
What Mahlon posted. 3/8-18 NPT. .

What Mahlon posted. 3/8-18 NPT.
.
Forum: RV General Discussion/News 12-01-2022, 07:32 PM
Replies: 31
Views: 1,436
Posted By DanH
Reminder...we've been moving toward all-electric...

Reminder...we've been moving toward all-electric airplanes for a while. Lots of owners here with two alternators, multiple batteries, etc. After the post-start battery recharge, we tend to have a...
Forum: RV General Discussion/News 12-01-2022, 04:01 PM
Replies: 10
Views: 946
Posted By DanH
Aerospace Purchasing

Got a question for the airline and corporate MRO guys.

Sometimes when shopping for products, I run into what seems like a purchasing firewall. The manufacturer won't quote a price or deliver...
Forum: Alternative Engines 12-01-2022, 02:26 PM
Replies: 90
Views: 9,167
Posted By DanH
I especially like the part where he recommends...

I especially like the part where he recommends hitting it with a hammer for alignment (about 3:35). The only place to hit it would be the ends of the lobes. Ack!

You're going to replace this thing...
Forum: Alternative Engines 12-01-2022, 11:07 AM
Replies: 90
Views: 9,167
Posted By DanH
Just a sketch to illustrate the above, something...

Just a sketch to illustrate the above, something I was playing with to satisfy my own curiosity. Agree with Keith; non-concentric rotation should load and unload the three ears equally, in turn, at...
Forum: Alternative Engines 12-01-2022, 08:25 AM
Replies: 90
Views: 9,167
Posted By DanH
Works for me. Apparently some were flown without...

Works for me. Apparently some were flown without welds?
Forum: Alternative Engines 12-01-2022, 07:48 AM
Replies: 90
Views: 9,167
Posted By DanH
Perhaps, but maybe not. I've seen homebuilt axle...

Perhaps, but maybe not. I've seen homebuilt axle assemblies with the same cracks, a function of poor design.

Easy to check. Grind off the weld and see if the axle will come out of the flange ...
Forum: RV General Discussion/News 11-29-2022, 01:34 PM
Replies: 55
Views: 4,994
Posted By DanH
What if this had been J-3? It's not a crazy...

What if this had been J-3?

It's not a crazy thought. The subject RV is carbed, with mags...no electrical requirement, same as the Cub. Plenty of fuel, more than the Cub. Weather broken or better,...
Forum: Alternative Engines 11-29-2022, 08:28 AM
Replies: 90
Views: 9,167
Posted By DanH
Section changes are obviously bad practice. ...

Section changes are obviously bad practice. However, consider the torsional load on that free-standing lobe. Think of the pin as the handle of a wrench.

Real analysis would be best, but if it has...
Forum: RV Ongoing Maintenance Issues 11-28-2022, 05:17 PM
Replies: 25
Views: 1,791
Posted By DanH
My note to Shorai and the...

My note to Shorai and the response:
____________________________________________

I note a competitor claiming their LiFePO battery incorporates internal cell balancing, and others do not. I am...
Forum: Fuel Injection Systems 11-28-2022, 10:24 AM
Replies: 11
Views: 538
Posted By DanH
Same as the 360A. Ask Ron Moring about enlarging...

Same as the 360A. Ask Ron Moring about enlarging the flange. Apparently it can be increased enough to eliminate the adapter normally used to mount an FM-200, bore size 3-1/16". May not be able to...
Forum: Electronic Ignition Systems 11-28-2022, 08:37 AM
Replies: 22
Views: 1,266
Posted By DanH
Nope. On the ground it will sound and run just...

Nope. On the ground it will sound and run just fine with advance in the 40's. At full throttle it may detonate, depending on conditions. However, even then it won't sound or run much different,...
Forum: Fuel Injection Systems 11-28-2022, 07:10 AM
Replies: 11
Views: 538
Posted By DanH
The standard horizontal sump should be 2-5/16",...

The standard horizontal sump should be 2-5/16", like the RSA-5. The "cold air" manifold on the 390C and D is sized for an RSA-10.
Forum: Electronic Ignition Systems 11-27-2022, 01:39 PM
Replies: 22
Views: 1,266
Posted By DanH
Different system, same move. Timing advance...

Different system, same move. Timing advance schedule below is for an angle valve. I don't know what sort of MAP sensor is on the board of the Autosport Labs timing control device I use, but the...
Forum: Primers 11-27-2022, 01:19 PM
Replies: 15
Views: 1,103
Posted By DanH
Bead blasting sheet aluminum tends to make it...

Bead blasting sheet aluminum tends to make it warp, and it removes the pure aluminum layer on alclad. Don't do it.
Forum: Electronic Ignition Systems 11-27-2022, 10:09 AM
Replies: 22
Views: 1,266
Posted By DanH
I seem to recall at least one case of a failed...

I seem to recall at least one case of a failed MAP sensor resulting in timing advance at high manifold pressure. Card, RV-9? It's here somewhere.

Anyway, with the manifold pressure sensor hose...
Forum: Fuel Injection Systems 11-27-2022, 07:34 AM
Replies: 11
Views: 538
Posted By DanH
RSA-5 and FM150 bore diameter at the throttle...

RSA-5 and FM150 bore diameter at the throttle plate and manifold flange is 2.3125"

RSA-10 is 3.4375"

An FM-200, as used on the 390-119, is 3.0625"

The RSA series has a significant bore reduction...
Forum: RV Ongoing Maintenance Issues 11-26-2022, 07:13 PM
Replies: 25
Views: 1,791
Posted By DanH
The "how" is probably simple charge limiting. I...

The "how" is probably simple charge limiting. I have a note out to Shorai.
Forum: Electronic Ignition Systems 11-26-2022, 07:16 AM
Replies: 22
Views: 1,266
Posted By DanH
I'm with Warren. Leave it alone and be happy. ...

I'm with Warren. Leave it alone and be happy. If we base on Nigel Speedy's data using a parallel valve 360, the base timing retard will result in lower CHT with no practical performance difference...
Forum: Traditional Aircraft Engines 11-26-2022, 06:51 AM
Replies: 21
Views: 1,130
Posted By DanH
Before we go, return to the photo from post...

Before we go, return to the photo from post #4



Is the circled fitting an elbow, or a tee?

If an elbow, and connected to a return line, all the return flow would be passing through the Bendix...
Forum: RV Ongoing Maintenance Issues 11-25-2022, 12:53 PM
Replies: 25
Views: 1,791
Posted By DanH
I'm speaking of cell balancing, the subject of...

I'm speaking of cell balancing, the subject of the referenced EarthX note, not over-voltage protection, the issue resulting in battery melt and smoke.

Are there any LiFePO batteries without active...
Forum: RV Ongoing Maintenance Issues 11-25-2022, 10:21 AM
Replies: 21
Views: 2,682
Posted By DanH
Or not...;)

Or not...;)
Forum: Traditional Aircraft Engines 11-25-2022, 10:16 AM
Replies: 21
Views: 1,130
Posted By DanH
No. The subject is a return connected near the...

No. The subject is a return connected near the servo inlet.



Strictly an aside, but there are only two practical ways an operator can raise nozzle pressure...advance the throttle, or change the...
Forum: RV-14 11-25-2022, 09:51 AM
Replies: 4
Views: 630
Posted By DanH
Primarily fixed exit area (early) vs fixed plus...

Primarily fixed exit area (early) vs fixed plus variable (119).



119 snorkel was re-shaped and flows better, and fits an FM-200.



Don't know, but probably unused mount lugs. Common to cut them...
Forum: Electronic Ignition Systems 11-25-2022, 09:00 AM
Replies: 22
Views: 1,266
Posted By DanH
Typically we tap MP by screwing a restricted...

Typically we tap MP by screwing a restricted fitting into one of the unused cylinder primer ports. The restrictor (1) serves to minimize the intake leak if the MP line becomes disconnected, and (2)...
Forum: RV Ongoing Maintenance Issues 11-25-2022, 08:50 AM
Replies: 25
Views: 1,791
Posted By DanH
Seriously, is there any automotive or aircraft...

Seriously, is there any automotive or aircraft LiFePO battery without internal cell management?
Forum: Traditional Aircraft Engines 11-25-2022, 08:25 AM
Replies: 21
Views: 1,130
Posted By DanH
Ahh. A classic PWM port injection has a...

Ahh.

A classic PWM port injection has a pressure regulator in the return flow path. The regulator holds the injector supply at a specific pressure above atmospheric regardless of engine demand. ...
Forum: Traditional Aircraft Engines 11-24-2022, 09:40 PM
Replies: 21
Views: 1,130
Posted By DanH
This isn't black or white. More a matter of...

This isn't black or white. More a matter of carefully considered compromise.

Let's start by asking "What is its intended purpose?"

Is there something special about your application which makes it...
Forum: Traditional Aircraft Engines 11-24-2022, 04:12 PM
Replies: 21
Views: 1,130
Posted By DanH
IF you want a constant flow return line tee'd to...

IF you want a constant flow return line tee'd to the inlet fitting for a Bendix-style fuel control, yes, it needs a restrictor. The minimum supply pressure for an RSA-5 is about 20 psi at WOT full...
Forum: RV Ongoing Maintenance Issues 11-24-2022, 11:24 AM
Replies: 12
Views: 744
Posted By DanH
The slosh compound is a problem. Best I know, you...

The slosh compound is a problem. Best I know, you can't use proseal over it. I have removed slosh from older composite Kitfox tanks with MEK and a stiff brush, but it ain't fun.

Offhand I don't...
Forum: Traditional Aircraft Engines 11-23-2022, 06:57 AM
Replies: 21
Views: 1,130
Posted By DanH
Which system are you guys discussing?

Which system are you guys discussing?
Forum: RV-10 11-23-2022, 06:53 AM
Replies: 19
Views: 1,156
Posted By DanH
Yes, SS rivets, 5/32 IIRC. Elevators balanced...

Yes, SS rivets, 5/32 IIRC. Elevators balanced individually.
Forum: RV-10 11-22-2022, 07:33 PM
Replies: 19
Views: 1,156
Posted By DanH
https://vansairforce.net/community/showpost.php?p=...

https://vansairforce.net/community/showpost.php?p=1592950&postcount=28
Forum: GPS 11-20-2022, 01:17 PM
Replies: 11
Views: 1,194
Posted By DanH
Follow up....I wedged a small bit of foam in...

Follow up....I wedged a small bit of foam in beside the inserted plug to wedge it firmly to the side which always had communication. Worked all year like that. I'm sure it's simply pushing...
Forum: Painting your RV 11-19-2022, 08:03 PM
Replies: 5
Views: 497
Posted By DanH
Where is Don? Calling...

Where is Don? Calling Don...

http://www.deltapopaviation.com/Home.html
Forum: RV Ongoing Maintenance Issues 11-18-2022, 09:38 AM
Replies: 53
Views: 23,352
Posted By DanH
Trouble is, the Flamemaster guy said the same...

Trouble is, the Flamemaster guy said the same thing.
Forum: RV Building Tips/Techniques 11-17-2022, 01:55 PM
Replies: 6
Views: 523
Posted By DanH
There is no truly safe insulation for the cabin...

There is no truly safe insulation for the cabin side of the firewall....and it doesn't work very well anyway. It's like wearing your underpants over your jeans and expecting skidmark prevention. ...
Forum: Propellers 11-17-2022, 12:19 AM
Replies: 43
Views: 2,537
Posted By DanH
C-1576 drawing below. As static friction is...

C-1576 drawing below. As static friction is typically higher than dynamic friction, the mechanical damping function (silicone grommets in parallel with friction damping) would only come into play...
Forum: Virtual Hangar 11-15-2022, 11:54 AM
Replies: 239
Views: 123,721
Posted By DanH
Brian, good to hear from you. What have you...

Brian, good to hear from you.

What have you been doing? Still making beautiful beans at the day job? ;)
Forum: Alternative Engines 11-15-2022, 09:17 AM
Replies: 90
Views: 9,167
Posted By DanH
Keith, suggest you consider natural rubber...

Keith, suggest you consider natural rubber torsional couplers made specifically for this sort of application. Lovejoy Centaflex is a personal favorite, but there are other couplers in various...
Forum: Propellers 11-14-2022, 05:17 PM
Replies: 43
Views: 2,537
Posted By DanH
Steve, great comments. Absolutely, for the...

Steve, great comments.



Absolutely, for the same reason that placing a damper at a node is ineffective.



Traded a note with Les Dowd today, and will follow up with another engineer. The...
Forum: Fiberglass 11-14-2022, 04:53 PM
Replies: 11
Views: 1,104
Posted By DanH
Photo illustrates what Steve said about using...

Photo illustrates what Steve said about using several layers of flannel. Depending on how wet the layups are, it's possible to squeeze a lot of epoxy into the bleeder ply. The shiny areas are fully...
Forum: Propellers 11-14-2022, 11:37 AM
Replies: 43
Views: 2,537
Posted By DanH
I am a fan of old SAE and NACA papers, in...

I am a fan of old SAE and NACA papers, in particular the pre-WWII years, the golden age of piston aircraft engine development. They tend to be written in plain language, in an era when it was all...
Forum: Fiberglass 11-14-2022, 10:58 AM
Replies: 11
Views: 1,104
Posted By DanH
For simple "at home" work I use... A vacuum pump...

For simple "at home" work I use...

A vacuum pump from some unknown machine dumped at my buddy's junkyard

Pink foam for forms, epoxy shelled or with a ply of glass for surface durability

HD garbage...
Forum: Propellers 11-14-2022, 10:32 AM
Replies: 8
Views: 847
Posted By DanH
I suspect we need only be patient. I have no...

I suspect we need only be patient. I have no inside info, but I do note they called this document "Volume 1"
Forum: Propellers 11-14-2022, 09:14 AM
Replies: 8
Views: 847
Posted By DanH
Hartzell Information Manual for Experimental Aircraft

Hartzell has released a document dedicated to propeller vibration compatibility. Apparently it is new, with a cover notation of "Original September 2022".

It lists all the currently approved...
Forum: RV Building Tips/Techniques 11-13-2022, 04:53 PM
Replies: 21
Views: 2,405
Posted By DanH
Those inlets are a nice piece of work. My...

Those inlets are a nice piece of work. My compliments sir.
Forum: Propellers 11-13-2022, 10:52 AM
Replies: 43
Views: 2,537
Posted By DanH
Hartzell C-1576. Appears to be little more than...

Hartzell C-1576. Appears to be little more than a mass ring in the limited photos I find on the net. Anyone have an exploded diagram?
Forum: Propellers 11-13-2022, 09:05 AM
Replies: 43
Views: 2,537
Posted By DanH
Mike, got a link to the STC information? "Like...

Mike, got a link to the STC information?



"Like a willow" is perhaps an excessive visualization. Strictly opinion, but I base it on having spent time around spinning props with a powerful variable...
Forum: Propellers 11-13-2022, 08:26 AM
Replies: 43
Views: 2,537
Posted By DanH
An accurate model of an engine-propeller system...

An accurate model of an engine-propeller system does incorporate blade root stiffness as well as the torsional stiffness of shafts and shaft equivalents. The FEA models now used in industry are...
Forum: Propellers 11-12-2022, 08:30 AM
Replies: 43
Views: 2,537
Posted By DanH
Obviously yes, assuming a shaft extension exists...

Obviously yes, assuming a shaft extension exists in a particular installation.

However, the question becomes "How stiff is it?". To see the reality, it's necessary to quantify, because we're...
Forum: Autopilots 11-11-2022, 11:37 PM
Replies: 9
Views: 481
Posted By DanH
Cool. Just covering the bases. When it kicks...

Cool. Just covering the bases.

When it kicks off, does the indicator actually display the legend "Excessive G" or something similar? I ask because just for fun, let's assume there is nothing...
Forum: Propellers 11-11-2022, 11:26 PM
Replies: 43
Views: 2,537
Posted By DanH
As there is no connecting stiffness between the...

As there is no connecting stiffness between the Landoll's inertia and the prop hub inertia, the effective result is an increase in prop inertia...making it more like the metal prop.
Forum: Propellers 11-11-2022, 11:04 PM
Replies: 43
Views: 2,537
Posted By DanH
Break the prop. Note pendulum absorbers are...

Break the prop.



Note pendulum absorbers are tuned to a specific order rather than a frequency.



In this specific application, it's more likely simply acting as a flywheel mass, as its location...
Forum: Autopilots 11-11-2022, 06:50 AM
Replies: 9
Views: 481
Posted By DanH
Dennis, the control box must be mounted with a...

Dennis, the control box must be mounted with a specific orientation. Should be a sticker or something indicating up and forward.

The servo reversal reset happens if the unit is powered on during...
Forum: RV Building Tips/Techniques 11-09-2022, 06:43 PM
Replies: 21
Views: 2,405
Posted By DanH
Sean, that design looks like it would seal well...

Sean, that design looks like it would seal well with simple strip seals...like a stock lower seal and a mirror copy on the top cowl. They get attached to the backside of the cowl flanges and overlap...
Forum: Fiberglass 11-07-2022, 06:33 AM
Replies: 11
Views: 1,087
Posted By DanH
Scrap aircraft fabric, generally free from the...

Scrap aircraft fabric, generally free from the guy on your airport who recovered his airplane. Unsized polyester.
Forum: RV-8/8A 11-02-2022, 07:33 AM
Replies: 17
Poll: RV-8 Carpet?
Views: 1,371
Posted By DanH
The standard is 2000F over 25 sq inches, with a...

The standard is 2000F over 25 sq inches, with a specified heat flux. The old test used an oil burner which is no longer available, so the FAA is going over to propane. However, unlike fuel oil, the...
Forum: RV-8/8A 11-01-2022, 03:07 PM
Replies: 17
Poll: RV-8 Carpet?
Views: 1,371
Posted By DanH
Luke, take a look at post 14 in a thread called...

Luke, take a look at post 14 in a thread called "Firewall kits -beta". There's a picture of the setup and a temperature plot.

"Target" is a proxy for objects on the cabin side of a firewall, but...
Forum: RV-8/8A 11-01-2022, 11:40 AM
Replies: 17
Poll: RV-8 Carpet?
Views: 1,371
Posted By DanH
FAR 25.853 is applicable for materials located...

FAR 25.853 is applicable for materials located well away from a powerplant firewall. 853 materials are not fireproof. They are merely expected to self extinguish after the heat source is removed. ...
Forum: RV-7/7A 10-31-2022, 07:25 PM
Replies: 2,061
Views: 1,578,814
Posted By DanH
No faintness of heart when you're only half-smart...

No faintness of heart when you're only half-smart ;)
Showing results 1 to 64 of 500

 
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