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Search: Posts Made By: Paragon
Forum: RV-12/RV-12iS 09-09-2020, 06:02 PM
Replies: 16
Views: 3,228
Posted By Paragon
Dan, I have sent you a PM. -Paragon Cincinnati,...

Dan,

I have sent you a PM.

-Paragon
Cincinnati, OH
Forum: Flight Testing 08-27-2020, 10:19 AM
Replies: 26
Views: 4,065
Posted By Paragon
Steve, Thank you for your interesting posts on...

Steve,

Thank you for your interesting posts on surface flow visualization techniques.

Many years ago, a co-worker and I were dispatched on short notice by the boss to the Mojave desert to do flow...
Forum: RV-6/6A 07-14-2020, 02:40 PM
Replies: 15
Views: 3,563
Posted By Paragon
I would recommend following the VG mfgr's...

I would recommend following the VG mfgr's installation instructions carefully.

JMHO: Putting VG's inboard but not outboard on the main wing is not particularly safe, in that you may stall one...
Forum: RV-12/RV-12iS 05-12-2020, 08:23 AM
Replies: 51
Views: 8,767
Posted By Paragon
JVC, I'm an aircraft owner wannabe in your area....

JVC,

I'm an aircraft owner wannabe in your area. Went to EAA meetings at KHAO, until I decided buying an existing aircraft was better for me than building.

I may be a potential buyer for your...
Forum: Alternative Engines 09-28-2019, 10:45 AM
Replies: 80
Views: 13,073
Posted By Paragon
I'm glad someone posted the FAA test requirements...

I'm glad someone posted the FAA test requirements for piston engines.

Oh my goodness, are those ever lenient, even pathetic, test requirements.

On commercial jet aircraft engines, one has to run...
Forum: RV-9/9A 09-24-2019, 10:19 AM
Replies: 33
Views: 7,052
Posted By Paragon
You also might want to check that the idle speed...

You also might want to check that the idle speed is set as per Lycoming, for your engine model.

On a -9A that I test flew briefly, (didn't land it), later found out the idle speed was set too high,...
Forum: California 09-02-2019, 03:28 PM
Replies: 22
Views: 3,353
Posted By Paragon
For what it's worth: I'm 6'3", and have sat and...

For what it's worth: I'm 6'3", and have sat and flown in an RV-9A and RV-12.

Perhaps a more important measure is the height from the ground to the top of your head while seated. For me, that is...
Forum: RV models of the future (RV-??) 08-05-2019, 10:52 AM
Replies: 77
Views: 32,252
Posted By Paragon
Well this thread spells it out pretty clearly. ...

Well this thread spells it out pretty clearly. The market demands...

At least 5 different aircraft:

1. Revised RV-3-like aircraft, RV-14 level of construction ease.
2. Super efficient one person...
Forum: RV models of the future (RV-??) 08-04-2019, 04:06 PM
Replies: 77
Views: 32,252
Posted By Paragon
Replying to Snowflake regarding the VariEze: No,...

Replying to Snowflake regarding the VariEze: No, I didn't fly the VariEze.

My main concern regarding landing speeds is what happens in the event of an engine out. Prior to seeing this aircraft,...
Forum: RV models of the future (RV-??) 08-04-2019, 09:03 AM
Replies: 77
Views: 32,252
Posted By Paragon
I recently had the opportunity to check out a...

I recently had the opportunity to check out a Rutan VariEze for sale locally.

This is a canard aircraft with unusually good performance on a low horsepower engine. How is this performance...
Forum: RV General Discussion/News 07-19-2019, 08:03 AM
Replies: 212
Views: 144,927
Posted By Paragon
Very interesting pictures of LIGO. I've read a...

Very interesting pictures of LIGO.

I've read a description of all the data postprocessing required to extract a signal from the LIGO data. The device is an exceptionally sensitive seismometer. One...
Forum: RV Photo/Video URLs 06-14-2019, 07:41 AM
Replies: 15
Views: 2,995
Posted By Paragon
Thank you for the cool photograph. I think...

Thank you for the cool photograph.

I think I'll make that the background on my laptop for a while...

-Paragon
Cincinnati, OH
Forum: RV-12/RV-12iS 06-01-2019, 07:32 AM
Replies: 4
Views: 1,046
Posted By Paragon
I've attended a presentation at an EAA chapter,...

I've attended a presentation at an EAA chapter, by an FAA inspector, regarding his work on an EXP airworthiness inspection.

His inspection consists of looking the plane over, looking the build logs...
Forum: Safety 05-08-2019, 05:43 PM
Replies: 50
Views: 8,540
Posted By Paragon
Since you solicited advice, it seems like perhaps...

Since you solicited advice, it seems like perhaps you need more than airplane advice.

A passenger suffering from the level of anxiety you describe doesn't seem like a good candidate to land an...
Forum: Glass Cockpit 02-01-2019, 07:57 PM
Replies: 31
Views: 3,076
Posted By Paragon
He wants to project the GPS velocity vector onto...

He wants to project the GPS velocity vector onto a HUD display. The HUD display is fixed to the aircraft. The GPS velocity vector is fixed to an earth coordinate system.

In order to do this, he...
Forum: RV General Discussion/News 01-27-2019, 10:14 AM
Replies: 1,777
Views: 474,781
Posted By Paragon
Steve, I like the fact that you're engineering...

Steve,

I like the fact that you're engineering this gadget with real numbers. So refreshing vs. the eyeball engineering that one so often sees on forums.

One possible thing to consider: The...
Forum: RV General Discussion/News 12-21-2018, 01:07 PM
Replies: 1,777
Views: 474,781
Posted By Paragon
Steve, Designing winglets that actually work to...

Steve,

Designing winglets that actually work to improve wing efficiency is one of the more challenging aero design problems in the airframe aero world.

Very easy to make winglets that actually...
Forum: RV General Discussion/News 11-19-2018, 05:10 PM
Replies: 30
Views: 4,025
Posted By Paragon
I personally feel it would be irritating to have...

I personally feel it would be irritating to have the main EFIS Primary Flight Display laterally offset from my view center.

Don't know how much you can move stuff around on the EFIS display, but I...
Forum: RV Friends Who Have Passed On 10-14-2018, 07:53 AM
Replies: 86
Views: 36,911
Posted By Paragon
My only encounter with Jon was when I stopped by...

My only encounter with Jon was when I stopped by his hangar one day and he proceeded to give me a thorough rundown on his RV-8, his vegetable oil smoke system, an RV-7A in the same hangar, RV's in...
Forum: RV-12/RV-12iS 10-11-2018, 10:18 AM
Replies: 8
Views: 2,210
Posted By Paragon
This information, while meant to be encouraging,...

This information, while meant to be encouraging, is far from it, IMHO.

Here we have a government agency that has heavily worked on and understood LSA rules for more than a decade. And multiple...
Forum: RV General Discussion/News 10-03-2018, 08:30 AM
Replies: 43
Views: 9,261
Posted By Paragon
An important point regarding tariffs are that...

An important point regarding tariffs are that they are not charged on the "retail price" of the product. They are charged on the wholesale price or an even lower origination price at the factory to...
Forum: RV-12/RV-12iS 09-29-2018, 08:30 PM
Replies: 9
Views: 1,692
Posted By Paragon
For reference, when I sit in an RV-12, I have...

For reference, when I sit in an RV-12, I have around 0.5" clearance to the canopy, without headphones.

Distance from top of my head to the floor, while seated, is 39".

In my opinion, I do not fit...
Forum: RV General Discussion/News 07-15-2018, 07:18 AM
Replies: 1,777
Views: 474,781
Posted By Paragon
A little follow-up on the vane discussion, I...

A little follow-up on the vane discussion, I should have described the following:

If we look at the first CFD with no vanes, we might say, "the bottom 20% of the heat exchanger has no flow!". The...
Forum: RV General Discussion/News 07-13-2018, 12:07 PM
Replies: 1,777
Views: 474,781
Posted By Paragon
Steve, I would not put too much effort into...

Steve,

I would not put too much effort into designing internal vanes and such, unless you are prepared to very carefully design a lot of them.

Your transition is so abrupt, I doubt you can fill the...
Forum: RV models of the future (RV-??) 07-09-2018, 07:19 PM
Replies: 650
Views: 228,460
Posted By Paragon
Shark-like or Stream-like RV-15

If anyone is familiar with the Stream and/or Shark aircraft from Europe, that is my suggestion of what the RV-15 perhaps should look like.

These two aircraft are similar tandem two-seaters with...
Forum: RV General Discussion/News 07-05-2018, 08:08 AM
Replies: 18
Views: 2,642
Posted By Paragon
Thumbs up Congratulations Scott! Good heavens I was out...

Congratulations Scott!

Good heavens I was out grilling yesterday afternoon and it was so hot I barely needed to turn on the grill. I'd be curious what the density alt. was when you slipped...
Forum: RV General Discussion/News 06-05-2018, 12:44 PM
Replies: 12
Views: 2,932
Posted By Paragon
Congratulations Scott! Lots of hard work finally...

Congratulations Scott!

Lots of hard work finally paying off. I hope to see your -9A passing by, from below, sometime soon.
...

To continue the Office Space analogy, it appears you've finally...
Forum: RV General Discussion/News 06-01-2018, 08:58 AM
Replies: 13
Views: 3,522
Posted By Paragon
Ed, Sorry to hear about your back issues - that...

Ed,

Sorry to hear about your back issues - that can be the worst sort of orthopedic malady. (For my much less serious back issues, I have to do some workarounds that are inconvenient but...
Forum: RV-12/RV-12iS 08-06-2017, 10:36 AM
Replies: 39
Views: 7,208
Posted By Paragon
I appreciate Alan's attempts to find the correct...

I appreciate Alan's attempts to find the correct spec data, and inform the rest of us via the forum.

Our Van's employee posters' snark is not welcomed, although that seems to be what we have to put...
Forum: RV-12/RV-12iS 07-19-2017, 07:33 AM
Replies: 88
Views: 21,762
Posted By Paragon
Upsides: 1. The performance data shows a 5400...

Upsides:

1. The performance data shows a 5400 ft increase in absolute ceiling... Wow, excellent. (Comparison is not apples to apples due to wheel pants.)
2. Got rid of the [expletive deleted]...
Forum: Safety 06-23-2017, 08:58 AM
Replies: 84
Views: 18,579
Posted By Paragon
Perhaps someone can clarify for my benefit how...

Perhaps someone can clarify for my benefit how the Beech Skipper fuel system differs from that of an RV.

The low wing Skipper training aircraft only had a BOTH or OFF position. It did have left and...
Forum: RV General Discussion/News 05-20-2017, 08:42 AM
Replies: 32
Views: 4,965
Posted By Paragon
One of the more unpleasant lessons I learned...

One of the more unpleasant lessons I learned while training was simply how to land the aircraft. Other items on the curriculum were never much of a problem.

I had a number of bad landings - think...
Forum: RV-14 08-29-2016, 08:23 AM
Replies: 8
Views: 3,496
Posted By Paragon
I asked Van's about this a while back. They...

I asked Van's about this a while back. They stated there will be no fixed pitch option for the RV-14a, with only this explanation: "the wide speed range argues for a constant speed prop."

The issue...
Forum: RV-9/9A 07-21-2016, 07:42 AM
Replies: 132
Views: 140,418
Posted By Paragon
Scott, Your panel is looking beyond slick. ...

Scott,

Your panel is looking beyond slick. Visibility should be excellent both day and night.

I hope all the interfaces come together quickly, with everything talking to everything else.

This...
Forum: RV-12/RV-12iS 07-06-2016, 06:53 AM
Replies: 33
Views: 11,102
Posted By Paragon
Lets think about this wing weight question with...

Lets think about this wing weight question with fuel moved to the wings:

When the aircraft pulls 3 g's in flight, most all the lift is provided by the wings. The fuselage is dead weight at 3g load...
Forum: RV General Discussion/News 05-14-2016, 07:50 AM
Replies: 63
Views: 14,234
Posted By Paragon
Reading up a few years ago on how to fly to...

Reading up a few years ago on how to fly to Alaska from the lower 48, I was surprised to find the following:

1. Canada requires a specific set of survival gear to be on board an aircraft - so many...
Forum: Painting your RV 02-29-2016, 08:29 AM
Replies: 209
Views: 94,341
Posted By Paragon
Nicely finished, Steve! You documented just how...

Nicely finished, Steve!

You documented just how much work is involved in painting an aircraft. (Much more than I would have imagined.) Also documented the amount of process tweaking necessary to...
Forum: Job Board 02-03-2016, 07:30 AM
Replies: 12
Views: 4,848
Posted By Paragon
Having scanned the Customs and Border Protection...

Having scanned the Customs and Border Protection posting: Seem like awfully steep requirements for a drone pilot (1500 total hrs, Commercial rating, etc).

Best of luck to those who qualify and...
Forum: Painting your RV 01-11-2016, 08:36 AM
Replies: 209
Views: 94,341
Posted By Paragon
Steve, Prior to therapy for "Painters OCD", one...

Steve,

Prior to therapy for "Painters OCD", one might recommend taking a few days off and spending quality time with the wife, and/or at one of Cincinnati's many craft breweries.

Given this week's...
Forum: RV General Discussion/News 12-18-2015, 12:28 PM
Replies: 7
Views: 4,516
Posted By Paragon
Ed, Ouch, that whole description sounds painful....

Ed,

Ouch, that whole description sounds painful. I've had some unpleasant back problems due to bulging disks, but thankfully it usually clears up after a few days. Would not want to deal with than...
Forum: RV-12/RV-12iS 12-02-2015, 11:21 AM
Replies: 14
Views: 5,438
Posted By Paragon
Brent, Thank you for the NTSB accident...

Brent,

Thank you for the NTSB accident information. One has to look up both "RV-12" and "RV12" in the NTSB database to get everything.

There were two nosegear collapses. The NTSB lists one...
Forum: RV-12/RV-12iS 12-02-2015, 05:27 AM
Replies: 14
Views: 5,438
Posted By Paragon
I agree on getting the fuel tank out of the...

I agree on getting the fuel tank out of the passenger compartment.

Or at least compartmentalizing the fuel tank with additional structure (perhaps not the ideal way to do it).

Who wants to be the...
Forum: Painting your RV 11-16-2015, 01:08 PM
Replies: 209
Views: 94,341
Posted By Paragon
Steve, Nice progress. Once you get this process...

Steve,

Nice progress. Once you get this process set up, you might consider hanging a shingle and going into the painting business. There are a lot of projects on that airfield!

It may be the...
Forum: RV-9/9A 08-31-2015, 07:30 AM
Replies: 10
Views: 4,648
Posted By Paragon
Thank you for the interesting photos,...

Thank you for the interesting photos, Steve.

Please note that whenever you do flow visualization on the surface of an aerodynamic body, you are seeing what the boundary layer is doing.

The air 1"...
Forum: Acts of Charity (using your RV) 08-31-2015, 06:54 AM
Replies: 4
Views: 9,819
Posted By Paragon
Pilots & Paws is a great mission. Thank you for...

Pilots & Paws is a great mission. Thank you for showing some pictures of the adventure.

Consider getting some hearing protection for the dogs next time. My understanding is that dogs have...
Forum: RV General Discussion/News 06-17-2015, 06:42 AM
Replies: 5
Views: 2,389
Posted By Paragon
Ed, Sounds like some good diagnosis...

Ed,

Sounds like some good diagnosis work.
...

Did you mamage to sort out your climb CHT issues on the same airplane by better sealing of the baffles?


Best Regards,
Forum: RV General Discussion/News 05-06-2015, 01:49 PM
Replies: 14
Views: 3,581
Posted By Paragon
Ed, For what it's worth: Interestingly enough,...

Ed,

For what it's worth: Interestingly enough, I went up in that very RV-9A on an Easter weekend demo flight (ambient was probably around 60F), and the owner made some comments to me during the...
Forum: RV General Discussion/News 04-15-2015, 08:50 AM
Replies: 4
Views: 1,593
Posted By Paragon
Ed, I believe you may have bought the RV-9A I...

Ed,

I believe you may have bought the RV-9A I was writing up an offer for, when I checked my e-mail and found out it had been sold!

I was zipping around over central Indiana with the owner a few...
Forum: Propellers 04-13-2015, 08:58 AM
Replies: 13
Views: 8,869
Posted By Paragon
It surprises me that a composite propellor is...

It surprises me that a composite propellor is painted (or left) black.

I had the opportunity to do flight tests in Mohave, CA on a composite aircraft engine nacelle. It was summertime, temperatures...
Forum: RV-14 01-30-2015, 01:54 PM
Replies: 6
Views: 6,955
Posted By Paragon
OK, thank you for the reply to my question. ...

OK, thank you for the reply to my question.

Keep up the good work at AFS!

-Paragon

Cincinnati, OH
Forum: RV-14 01-30-2015, 04:44 AM
Replies: 6
Views: 6,955
Posted By Paragon
Rob, Thank you for the tempting previews. A...

Rob,

Thank you for the tempting previews.

A quick question about these types of panels:

First note that I love the newer flat panel avionics with built-in synthetic vision. This to me looks...
Forum: RV-12/RV-12iS 01-17-2015, 09:53 AM
Replies: 12
Views: 3,820
Posted By Paragon
Issue at wing spar...

See Service Bulletin SB14-11-03...

Smoking rivets at the skin/spar junction on the bottom of the wing - the fix is to add a doubler over the skin that extends fwd and aft of the spar a little bit,...
Forum: RV-12/RV-12iS 12-21-2014, 10:00 AM
Replies: 12
Views: 3,820
Posted By Paragon
All, Thank you for your replies. Aluminum is a...

All,

Thank you for your replies.

Aluminum is a material that has no fatigue "endurance limit" under cyclic loading. (Steel, by contrast, will never fail under cyclic loading as long as the cyclic...
Forum: RV-12/RV-12iS 12-20-2014, 08:41 AM
Replies: 12
Views: 3,820
Posted By Paragon
Ah... It looks like they are only an inch or two...

Ah...

It looks like they are only an inch or two long, and rounded on the far end to boot. Coated with anti-sieze so you can get them on and off in the future.

But with anti-sieze they would not...
Forum: RV-12/RV-12iS 12-20-2014, 08:18 AM
Replies: 12
Views: 3,820
Posted By Paragon
All, Thank you for the replies. I've seen the...

All,

Thank you for the replies.

I've seen the wing removal video before - it doesn't really show the wing root area in any detail. (The smugmug site, unfortunately, does not work with my...
Forum: RV-12/RV-12iS 12-19-2014, 11:10 AM
Replies: 12
Views: 3,820
Posted By Paragon
Wing junction photo request

RV-12 builders...

To satisfy my curiousity, I'm wondering if someone here can post photos of the RV-12 wing junction area.

I'm particularly interested in seeing how the wing structurally attaches...
Forum: RV-9/9A 12-11-2014, 07:51 AM
Replies: 971
Views: 602,032
Posted By Paragon
Scott, It looks like good progress to me. Keep...

Scott,

It looks like good progress to me.

Keep on at it and eventually it will be finished.

Hopefully, the instructions are giving you a very clear order of operations (so there is no backtracking...
Forum: Acts of Charity (using your RV) 10-24-2014, 01:07 PM
Replies: 3
Views: 9,881
Posted By Paragon
That second picture just strikes me as...

That second picture just strikes me as humerous.

But now you've done it. I cannot get this tune out of my head:

Tie me kangaroo down, sport,
Tie me kangaroo down...


-Paragon
Cincinnati,...
Forum: Safety 09-12-2014, 07:45 AM
Replies: 8
Views: 3,996
Posted By Paragon
Jones0154, Thank you for the information and the...

Jones0154,

Thank you for the information and the link, and for the resulting clarification of this issue. I was not aware how difficult it might be to actually detect Jet A contamination in...
Forum: Safety 09-10-2014, 08:07 AM
Replies: 8
Views: 3,996
Posted By Paragon
This is just awful. A similar mis-fueling...

This is just awful.

A similar mis-fueling incident occurred near here perhaps 15 years ago, with the same results.

There were then months and months of lawsuit action. The fueling company was...
Forum: Safety 09-04-2014, 07:19 AM
Replies: 49
Views: 7,242
Posted By Paragon
Based on your description of the story, I would...

Based on your description of the story, I would go with,

"Rightside Up Again"

(But on the other hand, if you have the wherewithal to write a book, coming up with a title is certainly within your...
Forum: RV-8/8A 08-12-2014, 05:10 PM
Replies: 34
Views: 11,264
Posted By Paragon
Comment Regarding "Use Tax"

It is outrageous that states such as CA and several others are attempting to collect euphemistically named "use taxes", which, given that the states have no intention of measuring and taxing actual...
Forum: RV-9/9A 07-28-2014, 01:39 PM
Replies: 13
Views: 2,530
Posted By Paragon
RV-9A Pilot Fit Check

For what it's worth: Just this weekend a generous local builder let me do a "Pilot Fit Check" in his tip-up RV-9A.

At 6'3", 190# with perhaps a long torso, I had approximately 1" clearance to the...
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