VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Search Forums
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Showing results 1 to 62 of 500
Search took 0.60 seconds.
Search: Posts Made By: DanH
Forum: RV-7/7A Today, 07:25 AM
Replies: 6
Views: 334
Posted By DanH
Krea, those posts date from early 2008. Back...

Krea, those posts date from early 2008. Back then we all assumed gluing rubber and plastic to the cabin side of a firewall was a safe practice. I'm including myself, as I recall at least one...
Forum: RV-7/7A Yesterday, 06:53 PM
Replies: 6
Views: 334
Posted By DanH
You might be interested to know I un-hung my own...

You might be interested to know I un-hung my own engine and mount to install engine-side insulation, after testing showed there was no cabin-side approach nearly as good.

Might I add that I don't...
Forum: RV-14 Yesterday, 02:08 PM
Replies: 11
Views: 480
Posted By DanH
We all have an oil filter adapter. Perhaps you...

We all have an oil filter adapter. Perhaps you are referring to a remote oil filter adapter?
Forum: Traditional Aircraft Engines Yesterday, 12:11 PM
Replies: 9
Views: 264
Posted By DanH
You have heard of "morning sickness"?

You have heard of "morning sickness"?
Forum: Traditional Aircraft Engines Yesterday, 12:06 PM
Replies: 9
Views: 648
Posted By DanH
#3 has an intake gasket leak. Look at the plots....

#3 has an intake gasket leak.

Look at the plots. #3 gets warmer than the others at full throttle, just because it's a little leaner. The signature is the larger EGT divergence from the others at...
Forum: RV Ongoing Maintenance Issues 10-11-2019, 08:20 AM
Replies: 6
Views: 565
Posted By DanH
These days the fundamental choice is to buy a...

These days the fundamental choice is to buy a test set with or without a Continental orifice. You'll need the extra doodad to discuss anything about cylinders with a Continental rep. Not needed for...
Forum: ADS-B 10-10-2019, 03:14 PM
Replies: 8
Views: 421
Posted By DanH
May I be the first to send a "Thank you" to the...

May I be the first to send a "Thank you" to the entire Garmin team? It was the right thing to do, and ya'll got 'er done.
Forum: RV-8/8A 10-10-2019, 10:22 AM
Replies: 16
Views: 1,571
Posted By DanH
It does not extend all the way to the freestream,...

It does not extend all the way to the freestream, but rather to the top of a converging exit bell exhausting all the cowl air. Oil cooler mass flow meets the majority mass flow at a right angle,...
Forum: RV General Discussion/News 10-10-2019, 08:10 AM
Replies: 25
Views: 13,369
Posted By DanH
I forgot about the profiles in CR3405, identified...

I forgot about the profiles in CR3405, identified as Kuchemann A-series. They are much as Steve describes in post 23. Start at page 38.

The reference is Aerodynamics of Propulsion, Kuchemann and...
Forum: RV Ongoing Maintenance Issues 10-10-2019, 05:50 AM
Replies: 2
Views: 170
Posted By DanH
Nope. Just means you have a mixture valve with a...

Nope. Just means you have a mixture valve with a very low leak rate. Pump poppet valve too.

The rise is due to temperature
Forum: RV General Discussion/News 10-08-2019, 10:49 AM
Replies: 5
Views: 638
Posted By DanH
Fixed.....

Fixed.....
Forum: RV General Discussion/News 10-08-2019, 09:48 AM
Replies: 5
Views: 638
Posted By DanH
There is a lot more to it than round rings. ...

There is a lot more to it than round rings.

The three plots below were all generated with round inlets, but note the significant differences in upper plenum Cp. ...
Forum: RV General Discussion/News 10-07-2019, 09:58 PM
Replies: 5
Views: 638
Posted By DanH
We all have plenums. It is simply the interior...

We all have plenums. It is simply the interior cowl volume above the engine. That may seem pendantic, but it's important to realize a plenum lid is nothing more than a sealing device to replace...
Forum: RV General Discussion/News 10-06-2019, 01:39 PM
Replies: 25
Views: 13,369
Posted By DanH
In terms of pressure recovery, it works just...

In terms of pressure recovery, it works just fine. It is a low Vi/Vo type, like the cooling inlets....a 4" ring

I built that inlet many moons ago, with an eye on style. It may be separating...
Forum: RV Building Tips/Techniques 10-06-2019, 08:39 AM
Replies: 24
Views: 1,883
Posted By DanH
BTW, do not try to use 2lb density pour foam as...

BTW, do not try to use 2lb density pour foam as core in a finished part. I've not tried 4lb and higher as core, but I'd be real shy about it. Altitude pressure change made 2lb expand and contract...
Forum: RV General Discussion/News 10-06-2019, 08:31 AM
Replies: 35
Views: 2,238
Posted By DanH
Assume 12 sq inches, 170 KTAS, 3500 ft, std day,...

Assume 12 sq inches, 170 KTAS, 3500 ft, std day, and 2400 RPM. Available ram would be 0.85" Hg, a little less than what appears to be available at the cooling intake. However, throw in filter and...
Forum: RV General Discussion/News 10-06-2019, 08:08 AM
Replies: 25
Views: 13,369
Posted By DanH
I don't know of a paper dealing specifically with...

I don't know of a paper dealing specifically with spillage and nacelle forebody shape in the context of a low speed intake.

Any lip radius is a compromise given the variables. Look at the lips on...
Forum: RV Building Tips/Techniques 10-05-2019, 05:31 PM
Replies: 24
Views: 1,883
Posted By DanH
The basic plan is to tape a piece of cardboard or...

The basic plan is to tape a piece of cardboard or typing paper into place to act as a dam, mix/pour the urethane, and stand back while it expands. Do not try to trowel it, shape it, or guide it in...
Forum: RV General Discussion/News 10-05-2019, 02:47 PM
Replies: 25
Views: 13,369
Posted By DanH
It's in there. While we're commenting, the last...

It's in there.

While we're commenting, the last two lines above the chart may confuse some readers.

For example, At 200 kts, with a 3 inch diameter inlet, the differential in the inlet comes to 148...
Forum: RV General Discussion/News 10-05-2019, 11:30 AM
Replies: 35
Views: 2,238
Posted By DanH
I remember now, thanks. No shutoff for the...

I remember now, thanks.

No shutoff for the ducted supply when the butterfly is open, which means both intakes are providing pressure. That's clever. It's possible the cooling intake has more...
Forum: RV General Discussion/News 10-04-2019, 09:20 PM
Replies: 35
Views: 2,238
Posted By DanH
Ahhhh. Agree, sucking hot, low pressure air...

Ahhhh.

Agree, sucking hot, low pressure air through reed valves makes no sense.

Got pictures?
Forum: RV General Discussion/News 10-04-2019, 07:31 PM
Replies: 35
Views: 2,238
Posted By DanH
Screen capture, circa 2014. ...

Screen capture, circa 2014.

https://www.danhorton.net/VAF/Cowl%20Intake%20Design%20Question/Rod%20Bower%20IO-580%20Dyno%20Numbers.JPG

The butterfly drop...difference between (1) a bare FM-300...
Forum: RV General Discussion/News 10-04-2019, 04:23 PM
Replies: 35
Views: 2,238
Posted By DanH
4" ring leading directly into the airbox. The...

4" ring leading directly into the airbox. The idea was to go low Vi/Vo, like the cooling inlets, reducing risk of separation.



Best photo showing both halves of the box. The filter is trapped...
Forum: RV General Discussion/News 10-04-2019, 01:49 PM
Replies: 35
Views: 2,238
Posted By DanH
Here is some of that banishment. Early...

Here is some of that banishment.

Early construction photo, a diffuser-type airbox with a K&N RU-3120:

https://www.danhorton.net/VAF/Cowl%20Intake%20Design%20Question/Cone%20Filter%20Airbox.JPG

On...
Forum: RV General Discussion/News 10-04-2019, 07:58 AM
Replies: 35
Views: 2,238
Posted By DanH
I've seen 'em on dynos with and without filters,...

I've seen 'em on dynos with and without filters, but never with a duct.



The common term is "carb loss", the pressure drop due to intake restriction. It applies to any flow restriction, not just...
Forum: RV General Discussion/News 10-03-2019, 10:37 AM
Replies: 35
Views: 2,238
Posted By DanH
I too have a copy. Ken obviously added speed to...

I too have a copy. Ken obviously added speed to his airplane, but that doesn't make the mods optimal, only better than before. It also pays to remember some things make airplanes faster, but not...
Forum: RV General Discussion/News 10-03-2019, 09:10 AM
Replies: 35
Views: 2,238
Posted By DanH
One of our RV-8 builders has been gathering cowl...

One of our RV-8 builders has been gathering cowl pressure data, so i asked him to do a WOT climb and record. The result is interesting in the context of this discussion.

His cowl is stock RV-8. ...
Forum: RV General Discussion/News 10-02-2019, 08:47 PM
Replies: 35
Views: 2,238
Posted By DanH
Thank you sir...I'll take it! Useful to know. ...

Thank you sir...I'll take it! Useful to know.



That's a mistake I suspect with mine...it's relatively low Vi/Vo like the cooling inlets, but I didn't provide enough exterior radius around the...
Forum: RV Building Tips/Techniques 10-01-2019, 03:51 PM
Replies: 24
Views: 1,883
Posted By DanH
Hmmm.......

Hmmm.......
Forum: Traditional Aircraft Engines 10-01-2019, 12:40 PM
Replies: 22
Views: 993
Posted By DanH
All he wants is torque, not frequency, so the...

All he wants is torque, not frequency, so the easy approach is a short shaft extension (a spool) with the Wheatstone bridge and transmitter pre-installed.

Ross, did you notice much live torsional...
Forum: Traditional Aircraft Engines 10-01-2019, 12:12 PM
Replies: 22
Views: 993
Posted By DanH
Works very well, but not cheap, as you need...

Works very well, but not cheap, as you need telemetry to get the signal off the rotating shaft. Good news? Excellent equipment is available.
Forum: ADS-B 09-30-2019, 03:41 PM
Replies: 8
Views: 1,119
Posted By DanH
Sorry Carl, missed your response. Your account...

Sorry Carl, missed your response. Your account exactly matches what MGM approach was describing.
Forum: RV Building Tips/Techniques 09-30-2019, 03:23 PM
Replies: 24
Views: 1,883
Posted By DanH
Awful, don't...

Awful, don't bother.



http://www.shopmaninc.com/foam.html

2 lb density works fine for large forms, 4 lb is good all around, pick higher density for more accuracy or detail.
Forum: RV Building Tips/Techniques 09-30-2019, 08:40 AM
Replies: 24
Views: 1,883
Posted By DanH
I've abandoned clay. 4lb density pour foam is...

I've abandoned clay. 4lb density pour foam is wonderful.
Forum: RV General Discussion/News 09-30-2019, 08:38 AM
Replies: 6
Views: 691
Posted By DanH
https://www.danhorton.net/Misc/Borg.jpg

https://www.danhorton.net/Misc/Borg.jpg
Forum: RV General Discussion/News 09-29-2019, 06:34 AM
Replies: 35
Views: 2,238
Posted By DanH
Excellent point. The question becomes "How much...

Excellent point. The question becomes "How much is some distance?"

This requires a picture!

https://www.danhorton.net/VAF/Cowl%20Intake%20Design%20Question/Intake%20Length.jpg

First example...
Forum: RV General Discussion/News 09-28-2019, 09:12 PM
Replies: 4
Views: 636
Posted By DanH
Bill, I have an optical tach if none at Shelby.

Bill,

I have an optical tach if none at Shelby.
Forum: RV General Discussion/News 09-28-2019, 09:09 PM
Replies: 35
Views: 2,238
Posted By DanH
Perpendicular is generally fine. No, it does not...

Perpendicular is generally fine. No, it does not need to stick way out.
Forum: Traditional Aircraft Engines 09-28-2019, 11:32 AM
Replies: 92
Views: 56,031
Posted By DanH
Note the nice, even wear marks on Walt's seals. ...

Note the nice, even wear marks on Walt's seals. There are a few leaky spots, but not many.
Forum: RV-10 09-28-2019, 11:30 AM
Replies: 11
Views: 653
Posted By DanH
Ken, call Vic.

Ken, call Vic.
Forum: RV General Discussion/News 09-27-2019, 04:27 PM
Replies: 12
Views: 1,058
Posted By DanH
Issue isn't drawing hot air into the carb. It is...

Issue isn't drawing hot air into the carb. It is pressurizing the lower cowl volume.
Forum: Southeast 09-27-2019, 04:24 PM
Replies: 2
Views: 321
Posted By DanH
Now there's a blast from the past. Last time I...

Now there's a blast from the past. Last time I climbed at Horse Pens was 1980.
Nice little cliff faces down the bluff to the SE.
Forum: RV General Discussion/News 09-27-2019, 06:20 AM
Replies: 12
Views: 1,058
Posted By DanH
There is a sealing issue with either approach,...

There is a sealing issue with either approach, and imperfect sealing decreases deltaP available for cooling. Given the airbox moves laterally at start and shutdown, there is also an issue with the...
Forum: RV Ongoing Maintenance Issues 09-25-2019, 10:21 AM
Replies: 47
Views: 3,582
Posted By DanH
The interesting experiment would be to try a -3...

The interesting experiment would be to try a -3 line.
Forum: RV General Discussion/News 09-24-2019, 10:15 AM
Replies: 17
Views: 847
Posted By DanH
Which sensor is being used?

Which sensor is being used?
Forum: RV-8/8A 09-23-2019, 02:34 PM
Replies: 16
Views: 1,571
Posted By DanH
Probably, depending on upper and lower cowl...

Probably, depending on upper and lower cowl pressure. I can tell you how to measure it if you wish to have assurance before doing the swap.

I have some cowl pressures for RV-8's. I'll look at...
Forum: RV-8/8A 09-23-2019, 06:03 AM
Replies: 16
Views: 1,571
Posted By DanH
I started with a SW/Meggit 10599 and later...

I started with a SW/Meggit 10599 and later switched to a 10611. I've never counted rows. Both were remote mounted, which was not an issue. I've seen multiple approaches to mounting.

There are a...
Forum: RV General Discussion/News 09-22-2019, 12:32 PM
Replies: 13
Views: 810
Posted By DanH
You got me!

You got me!
Forum: RV General Discussion/News 09-22-2019, 12:00 PM
Replies: 13
Views: 810
Posted By DanH
But that's only Mach .00077778 ;)

But that's only Mach .00077778 ;)
Forum: RV Building Tips/Techniques 09-22-2019, 06:06 AM
Replies: 12
Views: 1,097
Posted By DanH
I'm curious. A P-mag can be clocked into the...

I'm curious. A P-mag can be clocked into the case at any angle. Obviously the standard stud for an impulse Slick is too long to fit in under the rectangular box portion of the P-mag. However, is...
Forum: ADS-B 09-22-2019, 05:44 AM
Replies: 8
Views: 1,119
Posted By DanH
Yes, last weekend I was inbound to 08A from the...

Yes, last weekend I was inbound to 08A from the south, squawking 1200/anonymous. After dialed up MGM approach and entered an assigned code, the controller responded with the usual, then asked if I...
Forum: RV-10 09-21-2019, 09:44 AM
Replies: 35
Views: 8,429
Posted By DanH
Michael, offhand I can't think of any reason why...

Michael, offhand I can't think of any reason why the overlay can't be riveted to the belly skin only. Others have done so, for what it's worth. Through the rib flanges is good too. You'll be using...
Forum: RV General Discussion/News 09-20-2019, 06:45 PM
Replies: 25
Views: 2,746
Posted By DanH
Easy now gents. Blame me. Bob is probably...

Easy now gents. Blame me. Bob is probably thinking of my posts regarding the temperature sensitivity of that particular actuator, as I did detect some increasing internal freeplay when using that...
Forum: Fuel Injection Systems 09-20-2019, 12:12 PM
Replies: 6
Views: 1,309
Posted By DanH
Amazing to see Neil and Todd go so fast in...

Amazing to see Neil and Todd go so fast in RV-8's. Darned impressive...230 knots at Reno density altitude, while pulling G! Hope they can find time for some tech talk here.

Why is Relentless slow...
Forum: Traditional Aircraft Engines 09-20-2019, 11:43 AM
Replies: 9
Views: 1,119
Posted By DanH
Plenty of RV-relevant content here.

Plenty of RV-relevant content here.
Forum: RV-4 09-20-2019, 06:12 AM
Replies: 7
Views: 613
Posted By DanH
Seen this movie before. Although fun and...

Seen this movie before.

Although fun and interesting, I'd recommend you drop the idea and concentrate on wrapping up the RV-14. It's not just the mods. Taking on a second project to mod,...
Forum: RV-8/8A 09-19-2019, 06:54 AM
Replies: 904
Views: 620,991
Posted By DanH
A Vans rib didn't fit right when tilted up, but...

A Vans rib didn't fit right when tilted up, but it's very easy to hammerform a new one which does. Trim the VS skin, hold an MDF block against the edge, trace the shape, cut the block inside the...
Forum: Traditional Aircraft Engines 09-19-2019, 06:18 AM
Replies: 9
Views: 939
Posted By DanH
Don't neglect to also remove, inspect, and clean...

Don't neglect to also remove, inspect, and clean the sump screen.

The screen catches large chunks upstream of the pump. The filter catches small stuff downstream of the pump.



Quite normal for...
Forum: Traditional Aircraft Engines 09-18-2019, 03:45 PM
Replies: 9
Views: 902
Posted By DanH
We're the only humans on the planet dumb enough...

We're the only humans on the planet dumb enough to accept slotted hose clamps on $30,000 engines.

The rubber extrudes through the slots, the clamp loses pressure, and the hose leaks.
Forum: RV-14 09-18-2019, 12:12 PM
Replies: 17
Views: 1,371
Posted By DanH
No rush. Is it being sprayed into the molds...

No rush.

Is it being sprayed into the molds prior to the glass/epoxy layups? Or is the vendor spraying the parts after they come out of the mold?

The parts themselves are still glass/epoxy?
Forum: RV Building Tips/Techniques 09-18-2019, 12:01 PM
Replies: 7
Views: 659
Posted By DanH
Yes sir, that looks familiar!

Yes sir, that looks familiar!
Forum: RV General Discussion/News 09-18-2019, 07:02 AM
Replies: 16
Views: 1,013
Posted By DanH
I flew with my red cube between the electric pump...

I flew with my red cube between the electric pump and the engine driven pump for about 600 hours, then moved it to the hose between the servo and the divider. The initial location worked fine at...
Showing results 1 to 62 of 500

 
Forum Jump

All times are GMT -6. The time now is 11:21 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.