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Search: Posts Made By: Vac
Forum: RV General Discussion/News 03-12-2021, 11:59 AM
Replies: 5
Views: 706
Posted By Vac
Bill, Looking like that may be the plan. Going...

Bill,

Looking like that may be the plan. Going to pull it and derivet from the spar and go from there.

To answer your question, not too bad; however I fly the airplane to limits (occasionally...
Forum: RV General Discussion/News 03-12-2021, 10:40 AM
Replies: 5
Views: 706
Posted By Vac
Smile Aileron Compatabilty

The stick monkey managed to damage the right aileron on his RV-4 whilst pulling it into the hangar. As we said in the militaryŚno excuse.

I need to fabricate a replacement as quickly as possible as...
Forum: Safety 02-11-2021, 09:21 AM
Replies: 47
Views: 4,622
Posted By Vac
Sailvi, you are correct. It’s just a sweet spot...

Sailvi, you are correct. It’s just a sweet spot for maneuvering if you are trying to simultaneously optimize turn performance and overall glide performance simultaneously close to the ground. Sorry...
Forum: Safety 02-11-2021, 06:21 AM
Replies: 47
Views: 4,622
Posted By Vac
Bootstrap Flight Test Technique

Great discussion.

I didn't see it mentioned anywhere in this thread, but another resource for gathering glide, Vx and Vy data is to use the bootstrap flight test technique (google friendly). Very...
Forum: RV-4 01-13-2021, 04:58 AM
Replies: 56
Views: 8,308
Posted By Vac
It's just #8 perimeter screws and the bolt thru...

It's just #8 perimeter screws and the bolt thru the forward mount that hold the tanks on. I use plastic "for sale" signs (cut in half) from the aviation aisle at the local Ace hardware slipped under...
Forum: RV-4 12-24-2020, 11:52 PM
Replies: 56
Views: 8,308
Posted By Vac
Mike is right. Catto is worth the scratch, based...

Mike is right. Catto is worth the scratch, based on your numbers. Bit of a waiting list, so sign up early. 2-blade makes removing the cowl easier for maintenance when you work single-handed.

If...
Forum: RV General Discussion/News 12-17-2020, 04:10 PM
Replies: 53
Views: 4,365
Posted By Vac
Technical Resources

Here are a few very good technical references regarding the aerodynamic considerations of turn back performance (these are referenced in Charlie's discussion on the topic in Sport Aviation and also...
Forum: RV General Discussion/News 12-13-2020, 04:54 AM
Replies: 53
Views: 4,365
Posted By Vac
Excellent points regarding the EAA flight test...

Excellent points regarding the EAA flight test program. It is an outstanding resource as are the "Flight Test" articles Charlie has been publishing. The crowd sourced data will be an excellent...
Forum: RV General Discussion/News 12-12-2020, 02:09 PM
Replies: 53
Views: 4,365
Posted By Vac
Bob, You are correct. The ONSPEED to L/Dmax...

Bob,

You are correct. The ONSPEED to L/Dmax initial segment is just any easy way to achieve maximum performance during the initial climb segment commensurate with conditions and maneuvering...
Forum: RV General Discussion/News 12-12-2020, 11:11 AM
Replies: 53
Views: 4,365
Posted By Vac
Don't over think it...

Pilot physics: best angle of climbs occurs at an AOA where max thrust is available; and best rate occurs at an AOA where max power is available.

You can use speed to determine these parameters;...
Forum: Safety 11-03-2020, 05:17 AM
Replies: 28
Views: 6,105
Posted By Vac
Peter, I agree with your assessment of the stall...

Peter,

I agree with your assessment of the stall signature and that it's lacking per se in the wind shear plot; thus I suspect your initial assessment of a down draft event is correct. The airplane...
Forum: Safety 11-02-2020, 06:00 AM
Replies: 28
Views: 6,105
Posted By Vac
Hi Carlos, Yeah, had to finish up the 360 to...

Hi Carlos,

Yeah, had to finish up the 360 to RTB...I was beating the undercast in the video back to initial and didn't want to divert.

To get the airplane to stall at 4G's, I add full power and...
Forum: Safety 11-01-2020, 09:43 AM
Replies: 28
Views: 6,105
Posted By Vac
Thank You!

Peter,

Excellent thoughts. We post here and on our web site with the intent that we'll work in a fish bowl; and let the folks smarter than us contribute to the project through critique.

I'm...
Forum: Safety 11-01-2020, 07:57 AM
Replies: 28
Views: 6,105
Posted By Vac
Data Plot

We were recently working on some data for the ONSPEED AOA project and decided to look at the May wind shear encounter as a natural lab experiment. My RV-4 has two independent AOA systems in addition...
Forum: Safety 09-25-2020, 07:40 AM
Replies: 51
Views: 7,642
Posted By Vac
250 Foot AGL Turn Back

https://youtu.be/trnwzBYvBQg

I find it helpful to be able to listen to Vx AoA and Vy AoA during takeoff. Flaps 20 in the RV-4 is optimum lift/drag trade off. Flaps 10 would be better, but my...
Forum: RV Ongoing Maintenance Issues 08-30-2020, 04:08 AM
Replies: 11
Views: 2,034
Posted By Vac
Suspect the “why” is increased static margin. ...

Suspect the “why” is increased static margin. Aircraft certified for IFR have to meet stability requirements. The more forward CG limit increases stability. Someone in the LAA is likely thinking...
Forum: RV-4 08-18-2020, 06:34 PM
Replies: 12
Views: 2,694
Posted By Vac
You may want to consider a PC-680 on the firewall...

You may want to consider a PC-680 on the firewall and a heavier crush plate for the propeller to maintain desired CG. Battery maintenance is much simpler and battery and crush plate may weigh less...
Forum: Glass Cockpit 07-15-2020, 05:20 AM
Replies: 41
AOA
Views: 9,702
Posted By Vac
Hi Greg, Ringing in the lines is certainly a...

Hi Greg,

Ringing in the lines is certainly a factor as is dealing with a noisy signal; but it's more complicated than that. We are trying to accommodate multiple sensor configurations, and each one...
Forum: Glass Cockpit 07-13-2020, 06:15 AM
Replies: 41
AOA
Views: 9,702
Posted By Vac
Audio and Video

Foremost, anyone that is using any AOA system (Dynon, etc.) and has developed a good feel for audio cues--that's a GREAT technique for flying AOA. Cues will vary by system and calibration. Many...
Forum: Safety 06-25-2020, 12:59 PM
Replies: 102
Views: 102,340
Posted By Vac
Thank you

Hi Al!

Thanks much for taking the time to read the training materials and briefings and posting your thoughts and observations. Hopefully some of the resources can be beneficial to you in your work...
Forum: RV General Discussion/News 06-09-2020, 11:37 AM
Replies: 8
Views: 1,000
Posted By Vac
AOA Considerations

If you want to accurately measure AOA, consider placing the tip of the probe aft of 25% chord (the mount in the picture will get a Dynon tube close to that), outside the propeller arc but inboard...
Forum: RV-4 05-25-2020, 11:54 PM
Replies: 3
Views: 558
Posted By Vac
Works like a champ

Mitchell 2 1/4 with hour meter. 1900 hours. Lycoming O-320-D2J with carb and Catto fixed pitch prop. Had to repair it once when the hour meter failed. Mitchell turned it in 24 hours. Consider...
Forum: Safety 05-21-2020, 08:15 AM
Replies: 28
Views: 6,105
Posted By Vac
Normal Landing Comparison

Scott, agree. What tone did let me know what my energy state was as soon as the event occurred, which helps to reinforce the requirement to hold the aircraft in the proper landing attitude.

One...
Forum: Safety 05-19-2020, 11:14 AM
Replies: 28
Views: 6,105
Posted By Vac
Mickey, Was 090 variable, light at the tree...

Mickey,

Was 090 variable, light at the tree line, near as I can tell. You can see the transition from the crab to the right during final as I descend out of the heavy air. Could have shifted...
Forum: RV Photo/Video URLs 05-19-2020, 11:00 AM
Replies: 8
Views: 1,204
Posted By Vac
Sweet!

Excellent video, Scroll. Who's the old dude narrating? ;)

Cheers,

Vac
Forum: Safety 05-18-2020, 08:27 PM
Replies: 28
Views: 6,105
Posted By Vac
Wind Shear Video

We were flying some AOA software tests last week and had a camera installed to record the standby airspeed indicator along with the normal forward view. My home base is a tree canyon close to the...
Forum: RV General Discussion/News 05-01-2020, 03:52 PM
Replies: 16
Views: 1,099
Posted By Vac
My installation is IAW the drawing in the...

My installation is IAW the drawing in the previous post using Tru Track supplied torque tube attachment fitting. Works like a champ--can't over-center based on geometry. It is necessary to relieve...
Forum: Safety 04-15-2020, 09:42 AM
Replies: 102
Views: 102,340
Posted By Vac
Links to Corrected PDF Version:

Folks,

We've been busy with the AOA project, and version 3.3 of the training resources is still current. Turns out when I published this, I used the wrong "save as" option when I converted it to...
Forum: Safety 04-10-2020, 08:29 AM
Replies: 116
Views: 44,030
Posted By Vac
Getting Ready for Expanded Beta Test

It's been a busy six months or so, and our team of volunteers has been working hard to fully develop the Gen 2 AOA system. Our latest addition is an overload warning system (OWS) that provides...
Forum: Safety 04-01-2020, 06:19 AM
Replies: 1
Views: 602
Posted By Vac
Thanks!

Jim,

Very generous of you. Thank you.

For folks building systems, we've migrated all of our builder's instructions and software to our GitHub site: https://github.com/flyonspeed.

We're always...
Forum: RV General Discussion/News 03-31-2020, 12:56 AM
Replies: 7
Views: 864
Posted By Vac
ONSPEED Box

Ed,

There’s a V3 box and wiring harness with your name on it. It’ll record G3X data (as well as AFS and Dynon). All of these systems record at a different Hz rate. Believe Garmin G3X rate is...
Forum: RV-6/6A 03-11-2020, 06:30 AM
Replies: 13
Views: 3,042
Posted By Vac
Hi George, You are absolutely correct. Flight...

Hi George,

You are absolutely correct. Flight test is the only way to determine glide capability for any airplane, and every RV is unique. Which means every airplane requires flight test to...
Forum: RV-6/6A 03-10-2020, 07:25 AM
Replies: 13
Views: 3,042
Posted By Vac
If you fly L/Dmax AOA, it’s not effected by...

If you fly L/Dmax AOA, it’s not effected by weight, G-load or density altitude. Flaps up, L/Dmax AOA and max endurance glide (ONSPEED) AOA are different. When you deploy flaps, best overall glide...
Forum: Safety 03-01-2020, 11:43 AM
Replies: 0
Views: 530
Posted By Vac
Smile Volunteer Aero Analyst Wanted!

Shameless request: The Fly ONSPEED project could use an aeronautical engineer that is familiar with MatLab to help with flight test data analysis.

We are an open-source, non-profit 501(c)3...
Forum: Safety 02-10-2020, 03:10 PM
Replies: 116
Views: 44,030
Posted By Vac
3D Audio Yaw Cues

To avoid an unintentional loss of control, the pilot has to properly control AOA, sideslip and energy. Our basic tone logic addresses AOA and energy; so recently, we've begun experimenting with 3D...
Forum: RV General Discussion/News 02-08-2020, 10:00 AM
Replies: 10
Views: 1,510
Posted By Vac
Energy on Final

Larry,

A few points to ponder in no particular order:

1. Nothing wrong with a 3 degree final, it just may require that you carry some power. Any power-off final is going to coincide with glide...
Forum: RV General Discussion/News 02-06-2020, 02:59 PM
Replies: 10
Views: 1,510
Posted By Vac
Larry, Yes, use 1.3 Vs flaps 30 for your set...

Larry,

Yes, use 1.3 Vs flaps 30 for your set point (keep all of your apples apples :)).

I'm not sure whether or not Garmin factors the 1.1 stall into their aircraft curve algorithm, so just use 1.1...
Forum: Glass Cockpit 02-06-2020, 07:03 AM
Replies: 41
AOA
Views: 9,702
Posted By Vac
Carlos, There is actually a Van's drawing for...

Carlos,

There is actually a Van's drawing for the Ray Allen flap position sensor in the RV-8. I used the same sensor in the -4 (which might be the only airplane with Armstrong flaps and a flap...
Forum: RV General Discussion/News 02-06-2020, 06:22 AM
Replies: 10
Views: 1,510
Posted By Vac
Performance AOA Cues vs Progressive Stall Warning

Larry,

Short answer: IDLE. Steve is correct, the angle does not change.

Background: All AOA systems provide progressive stall warning. Some AOA systems, when properly calibrated, may provide...
Forum: RV General Discussion/News 01-26-2020, 10:19 AM
Replies: 49
Views: 6,969
Posted By Vac
Performance Cuing

Any AOA system that can be calibrated to provide performance cues (L/Dmax and ONSPEED) in addition to "slow" cueing is going to be more useful than simple, accurate progressive stall warning. The...
Forum: RV General Discussion/News 01-23-2020, 11:11 AM
Replies: 49
Views: 6,969
Posted By Vac
More points to ponder

From the "it depends" department: "Unload" is a relative term, it just means less G than required for whatever it is you are trying to do. In most civilian flying, that means "something less than...
Forum: RV General Discussion/News 01-23-2020, 12:55 AM
Replies: 49
Views: 6,969
Posted By Vac
It?s not about AOA or Airspeed; it?s about energy?

90% of what we are doing with the FlyONSPEED project is trying to provide high quality training resources to the EAB community. Lots of these are concepts that we were taught as fighter pilots in...
Forum: Safety 01-12-2020, 06:06 PM
Replies: 116
Views: 44,030
Posted By Vac
Making Sausage...

As we've been developing the second generation, stand-alone AOA system we've done lot's of flight test. Some of it is about as inspiring as watching paint dry (GPS speed runs to determine upwash...
Forum: Glass Cockpit 01-03-2020, 10:57 PM
Replies: 41
AOA
Views: 9,702
Posted By Vac
Smile Rob, An experimental test pilot buddy of mine...

Rob,

An experimental test pilot buddy of mine has an RV-4 with a sport system. We are going to strap a Gen 2 V3 box in the airplane and test the feasibility of using AFS-style wing ports as the...
Forum: Safety 01-03-2020, 09:57 AM
Replies: 116
Views: 44,030
Posted By Vac
Blog

For folks that are interested in following progress in the ONSPEED project, I've got a blog up on our website: FlyONSPEED.com.

I update the blog semi-regularly to keep from choking the plumbing...
Forum: Safety 01-03-2020, 09:55 AM
Replies: 116
Views: 44,030
Posted By Vac
Carlos, Figures--remember who you're working...

Carlos,

Figures--remember who you're working with here. Sorry about that. Give me a call any time.

Cheers,

Vac
Forum: Safety 01-03-2020, 06:00 AM
Replies: 116
Views: 44,030
Posted By Vac
Carlos, I sent an email--hopefully I got it...

Carlos,

I sent an email--hopefully I got it right this time! If not, feel free to call.

Cheers,

Vac
Forum: Safety 01-02-2020, 08:49 PM
Replies: 116
Views: 44,030
Posted By Vac
Hi Carlos, The Dynon pitot heat unit and our...

Hi Carlos,

The Dynon pitot heat unit and our computer could be bolted to an inspection plate, as long as there is no interference with your aileron bellcrank. I have one of our computers on my...
Forum: Safety 12-29-2019, 08:05 AM
Replies: 102
Views: 102,340
Posted By Vac
Stall Spin in the Base Turn Video

Recently there was some excellent discussion regarding slipping RV's that evolved into discussion about stalling while slipping. As a result of participating in that thread, I thought it might be...
Forum: RV General Discussion/News 12-27-2019, 06:43 AM
Replies: 61
Views: 9,508
Posted By Vac
3 Minute Summary

I thought it may be helpful to put together a short video that summarizes some of the discussion in this thread. Notes, warnings and cautions in previous posts are worth re-reading; as is keeping in...
Forum: RV General Discussion/News 12-22-2019, 06:58 AM
Replies: 61
Views: 9,508
Posted By Vac
Figs, Great questions. First, a good rule of...

Figs,

Great questions.

First, a good rule of thumb for the coefficient of pressure pitot/AOA probes is that they can handle up to about 6 degrees of sideslip. I find I run out of rudder...
Forum: RV General Discussion/News 12-20-2019, 09:12 PM
Replies: 61
Views: 9,508
Posted By Vac
Skylor/Luddite: I ran an additional test today...

Skylor/Luddite:

I ran an additional test today as I was concerned my elevator input in yesterday's example may have been too rapid. Today's test conditions were similar to yesterday's and RV-4...
Forum: RV General Discussion/News 12-19-2019, 06:30 PM
Replies: 61
Views: 9,508
Posted By Vac
Hi Skylor, I'm actually maintaining full inside...

Hi Skylor,

I'm actually maintaining full inside aileron during the departure sequence (to extent that I can). I had some spare gas today, so I flew three intentional departures using the same...
Forum: RV General Discussion/News 12-19-2019, 06:26 AM
Replies: 61
Views: 9,508
Posted By Vac
Stall/Spin in the Base Turn

SLIP

It's difficult to get the airplane to depart controlled flight (stall/spin) in a slip. Note the "ratcheting" effect as the airplane stalls. In this case, I'm in a sustained deep stall...
Forum: RV-4 12-02-2019, 10:46 AM
Replies: 5
Views: 1,114
Posted By Vac
Transition Manual

I built the Normal and Emergency chapters of the transition training manual to serve as a basis for flight manual development. You can download a copy from the sticky at the top of the safety page. ...
Forum: Safety 11-18-2019, 09:06 AM
Replies: 16
Views: 2,512
Posted By Vac
SFO Practice

Skylor,

Excellent data and great idea for a thread.

I regularly practice SFO (simulated flame-out patterns). One of the things you noted was that you lost less altitude in a 45-degree banked...
Forum: Glass Cockpit 11-07-2019, 08:25 PM
Replies: 134
Views: 29,983
Posted By Vac
Hi Vern, Excellent idea for a compact rear...

Hi Vern,

Excellent idea for a compact rear cockpit display! You might consider inverting the font size for data vs labels to help with “old man” eye syndrome ;)

Our first generation tone generator...
Forum: Safety 10-29-2019, 12:12 PM
Replies: 20
Poll: Slosh poll
Views: 8,458
Posted By Vac
Tom, All ?slosh? falls under the preview of the...

Tom,

All ?slosh? falls under the preview of the SB. As you noted, there are two types. The quality of the original work is what?s critical (actually how well the tank was prepped and cleaned). My...
Forum: RV General Discussion/News 10-13-2019, 09:00 PM
Replies: 4
Views: 705
Posted By Vac
Ed, I sent an email with charts and some other...

Ed,

I sent an email with charts and some other tools.

Cheers,

Vac
Forum: Safety 09-16-2019, 05:40 AM
Replies: 12
Views: 3,291
Posted By Vac
Here's this fighter pilot's approach for using...

Here's this fighter pilot's approach for using angle of attack to managing energy engine-out in 2500 words or less: ...
Forum: RV-4 08-13-2019, 09:49 AM
Replies: 10
Views: 2,496
Posted By Vac
Gear Socket Crack Pile On

Smokey's post is spot on.

FWIW, I've found cracks in the gear socket welds that showed up as a result of axle grease that oozed out through the crack. The gear legs are installed with grease, and...
Forum: RV-4 08-12-2019, 06:09 AM
Replies: 10
Views: 2,496
Posted By Vac
Not necessarily a red flag. Rudder cracking also...

Not necessarily a red flag. Rudder cracking also has to do with the quality of the trailing edge bend, how the leading edge bend was accomplished, the manner in which the stiffeners are fabricated...
Forum: Safety 07-04-2019, 03:30 PM
Replies: 116
Views: 44,030
Posted By Vac
OSH Forums

Hi Folks,

Team ONSPEED will have a small booth in the EAA Innovation pavilion (IC-29) and will be conducting a couple of AOA forums. Our skunkworks will be talking about our HUD project as well. ...
Forum: RV General Discussion/News 07-04-2019, 08:06 AM
Replies: 0
Views: 1,009
Posted By Vac
Bolting new AOA gear into the Jurassic RV-4

The B Flight contingent of Team ONSPEED spent last week modifying the Jurassic RV-4 with new AOA systems and a calibrated test boom. No way a washed up, unfrozen caveman stick monkey could handle a...
Showing results 1 to 64 of 394

 
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