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Bob Grimstead
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Posted Sunday, December 2, 2007 @ 09:33 PM  

Hello Folks,

If anybody's interested, I've just been told there is a clip of the second (easy) half of my Red Bull display on YouTube at: http://www.youtube.com/watch?v=4gnLzWVxdnI

Enjoy.

Yours, Bob

Bob Grimstead
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Posted Monday, March 10, 2008 @ 10:29 AM  

Hello again folks,

'Mr Darangulafilm' is becoming a good friend. He takes time out of his busy life to come and film me when I fly, so now there's another clip of 'how not to fly Fournier aerobatics' on youtube:

http://www.youtube.com/watch?v=n32sU0PlKJc&feature=user

In my defense, I can tell you that the display site was extremely tight. It was over a river winding through a narrow park between areas of dense housing. I was not allowed to fly within 200 metres of the houses on either side (they were approx 500 metres apart) nor within 500 metres of the end of the line, where there were industrial buildings bordering a major road. And of course, the river is not straight and there was a fifteen-knot wind blowing at 45 degrees to the display line and blowing me towards the industrial buildings (among which were a police station and my spectators, at the opening of the Canning City Offices outdoor amphitheatre).

That's why you can see me altering heading almost every time I come down over the top of each manoeuvre. I'm not just wobbling, but trying to stay over the river and legal. Accuracy of technique and proper shapes went right out of the window in favour of not overflying anybody who might complain.

Yes, excuses, excuses... You try it!

There would be some on-board footage too, but I was a bit too distracted to remember to press the shutter release button. Maybe next time?

Roll on summer for us all, so we can all do more Fournier aerobatics!

Now Matthew Hill and I have a British Fournier, we are going to try to get some British displays.

Is there anybody out there in Britain who would like us to display for their air show, school open day, village fete, wedding, bar mitzvah, birthday etc?

If so, e-mail me via this site.

Yours, Bob

Sam M.
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Posted Wednesday, April 14, 2010 @ 01:56 AM  

Hello Everyone, I tie rapped a video camera to my headset! This is the un-edited raw video,so you will have to tilt your head to the left. Sorry!

http://www.youtube.com/watch?v=ze7BMwpSn0o

jb92563
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Posted Wednesday, April 14, 2010 @ 10:25 AM  

Very cool, and it took me a minute to remember my LCD monitor swivels 90 deg clockwise so it was no big deal.

It looks like your gas cap fuel guage is gone? or your on empty?

What kind of camera are you using?

--------------------
Ray
RF4D #4057 N-1771 Rectimo 1400cc
http://picasaweb.google.com/jb92563/FournierRF4D
http://www.touringmotorgliders.org

Sam M.
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Posted Wednesday, April 14, 2010 @ 11:30 AM  

I have an "aerobatic fuel cap" like Bob's but I think mine is factory made. The camera was a Kodak easyshare C613 that i tierapped to my headset!
Bob Grimstead
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Posted Monday, April 19, 2010 @ 06:59 AM  

Hey Sam,

That's really excellent stuff.

I'm glad to see your vertical quarter rolls and half-Cubans are coming along vey nicely.

Congratulations.

Yours, Bob

Sam M.
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Posted Saturday, May 29, 2010 @ 04:16 AM  

I got my hands on a Go Pro HD, and did my routine!

http://www.youtube.com/watch?v=eG7_8aOqNsI

Jorgen
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Posted Saturday, May 29, 2010 @ 05:00 AM  

Hey Sam,
far out- or should I say far 8?! Nice routine and precise flying, that 8-point roll looks very nice. Do you think it´s possible to hesitate for a fraction longer without dishing out? Also, stunning video quality- it looks almost like you flew without canopy. I clearly(!) see I have to polish mine more often...

I see you fitted a tab to your left aileron, does it work?

May the 4's be with you/ Jörgen

Sam M.
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Posted Saturday, May 29, 2010 @ 04:56 PM  

Thanks Jorgen!
I think i can hold the points a little longer, if i tried harder. The tab works Great!
Bob Grimstead
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Posted Sunday, May 30, 2010 @ 09:01 PM  

Lovely flying Sam; very impressive.
Nice, circular loops -- they're not easy.
I never would have thought an eight-point roll was feasible in an RF4, that's great skill you're showing there.
I must try one some day.
Congratulations on pushing the envelope.

Yours, Bob

Jorgen
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Posted Monday, May 31, 2010 @ 02:02 PM  

Sam,
just a quick question- which way does your trim tab on the left aileron point- up or down? The reason I ask is I thought it looked on the video to point up, which puzzled me a bit.

The "factory induced roll" on RF 4's is to the right, so to counter that and make the RF 4 fly straight you need aileron iinput to the left. That means to fit a downpointed tab on the left or a uppointed one on the right aileron. I haven't changed my tab from right to left yet (what- me lazy?) but as we covered in another thread it makes more sense to fit the tab on the left aileron to get some adverse yaw so the fuselage flies straight.

Anyway, inspiring video Sam and I will try a point roll too. Since trigonometry is so fascinating I might go for a 5-point?

May the 4's be with you/ Jörgen

[Edit by Jorgen on Monday, May 31, 2010 @ 02:03 PM]

Bob Grimstead
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Posted Saturday, November 6, 2010 @ 07:57 PM  

Hi Guys,

For anybody who's interested in seeing some of the difficulties of flying formation aerobatics in our low-drag, underpowered little airplanes, there's a YouTube clip taken from one of our early training sorties at:

http://www.youtube.com/watch?v=NOelIEttBhA

I was hoping this footage would be a useful training aid, but it's effectively useless because of the very restricted field of view and the exposure difference within the cockpit and outside, so I didn't make any more clips after that day.

Don't be misled by our apparent great distance apart. We actually have about one wingspan's separation, which is not only reasonably safe, but makes our wing-tip smoke trails equidistant.

The Skyhawks flew at about half that separation, partly because there were three of them, so they didn't need to worry about equidistant smoke trails, but mostly because they were all much better at it than I am.

Looking back now, I find it amusing to see just how much I'm over-controlling with both the stick and the throttle, but as I said, that was back in the early days.

I will accept constructive criticism from anybody who has tried it themselves.

Enjoy.

Yours, Bob

[Edit by Bob Grimstead on Sunday, January 30, 2011 @ 11:04 AM]

Bob Grimstead
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Posted Sunday, February 20, 2011 @ 09:08 PM  

Hi Guys,

Now my blue Fournier is flying again, I have been able to practice some simple aerobatics with my new GoPro camera watching impassivley over my shoulder. Getting my excuses in early, I will tell you I had not flown for over two months. I chose a cloudy day, because it just happened to be cloudy when I wanted to fly, but it does give the advantage of enabling you to see what's happening when I am pointing upwards.

Be aware that, because of the camera's wide angle lens, there is quite a lot of distortion, so the climbing and descending thirty-degree lines for the Cubans look almost level.

This on-board clip is now posted on my FournierBob YouTube site at: http://www.youtube.com/watch?v=o-pGWvjjtu8

With the GoPro's high resolution, you should be able to read the instruments (which was the whole point of this), and I removed the coaming to get more light on to them, but the lens has such a wide viewing angle I don't think you will be able to do more than just see approximately where the ASI's needle is pointing. Simply note that the airspeed is very low over the tops of all the looping manoeuvres, to try and make them appear as round as possible. Starting speeds are not critical, but should be around 100-110 knots or 110-120 mph for most figures. Beware, this ASI is marked in proper knots (not mph).

The engine splutters a lot under reduced G because it is running very over-rich. This is partly because I am at 4,000 feet, but mainly because I am running the old 1400 engine with the enlarged main jet optimised for the new 1750 engine.

This simple routine comprises: Loop, left barrel roll, right hammerhead (stall turn), left slow (axial) roll, half Cuban, avalanche (note serious over-rotation in the flick/snap recovery) half reverse Cuban, quarter upward vertical roll, canopy-down humpty-bump, quarter downward vertical roll, loop, quarter-clover right, quarter-clover left.

I hope you enjoy it (I did!) and I hope there is something of interest there.

Regrettably my video-editing computer is dead (temporarily, I hope) so I cannot record a commentary or edit out my fist turning the camera on and off. Sorry.

Yours, Bob

[Edit by Bob Grimstead on Sunday, February 20, 2011 @ 09:24 PM]

[Edit by Bob Grimstead on Monday, February 21, 2011 @ 00:12 AM]

[Edit by Bob Grimstead on Thursday, February 24, 2011 @ 00:19 AM]

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Bob Grimstead
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Posted Thursday, April 14, 2011 @ 10:13 PM  

Hiya Folks,

I've just posted clips of a couple more complex manoeuvres I enjoy flying (when I'm on the ball).

These are a pair of triplets.

The first is my quarter upward vertical roll -- stall turn/hammerhead -- three-quarter downward flick/snap as seen during several of my displays, but I have discovered that if I make the roll to the left it makes a useful turn-around figure.
Going on from that, I've also discovered that, if you pull very slightly short of the upward vertical the engine keeps running, but you need quite a lot of right rudder to keep the wings level, so the obvious thing to do is to make that stall turn to the left. This has, quite remarkably, turned out to be an easier and more predictable figure than making the initial roll and stall turn to the right.

http://www.youtube.com/watch?v=BOv_XW0eyvw

Have fun watching.

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Bob Grimstead
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Posted Thursday, April 14, 2011 @ 10:57 PM  

My second clip is of a canopy-up humpty-bump.
To make it more interesting, I have flown quarter vertical rolls up & down before and after.

You can easily fly a simple straight up and down canopy-up humpty-bump without my inverted carb mod, but you would need this mod (or a similar one) if you're going to make the upward roll first, otherwise you simply would not have enough airspeed at the top to get all the way around the humpty.

The thing that makes this canopy-up humpty rather more difficult than the simple canopy-down humpty is that, to remain absolutely vertical during the upward roll, you have to keep moving the stick steadily forwards at exactly the correct rate. Move it too slowly and you end up a little on your back (no problem for the canopy-down humpty) but move it too quickly and you get negative G so the engine stops.

Oh, and you need vast amounts of rudder and aileron to stay straight and wings-level over the top because you have NO airspeed!

So, naturally, this is a very satisfying manoeuvre to pull off if and when you do get it right.

http://www.youtube.com/watch?v=aVsG0oq6lzQ

Have fun giving it a try without the rolls first.

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Jorgen
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Posted Saturday, April 16, 2011 @ 04:04 PM  

Thanks Bob,
that is remarkable quality clips, it´s amazing that a little gadget like the GoPro can deliver such sharp films. It is very helpful to see in-cockpit views of what the maneuvres look like, although the position of the horizon might appear a little different due to the wide angle lens?

But- you forgot to link to the best clip- your rollingcircle! I thought that was impressive, and also nice to see the revolving, panoramic view of YSENs surroundings. It´s funny to see you do the damdest to get rid of all stored energy in your clips when you have such nice looking cumulusclouds all around, but maybe they did not produce much lift?

I had a nice 4-flight myself the other day with 20 min engine time, 1 h 15 min total and an engine-off landing; sprING brING thermallING. I´ve said it before, I can´t think of a more versatile aeroplane than the 4. Thank you for letting us all in on how we can best utilize the aerobatic potential of our mounts, Bob!

May the 4´s be with you/ Jörgen

Bob Grimstead
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Posted Saturday, April 16, 2011 @ 09:27 PM  

Thanks very much Jörgen,

I didn't link the rolling circle because it's not a very good one. Strictly it should have a steady roll-rate all the way around, but I just can't do that yet.

Yes, there's huge amounts of lift in those clouds, but the bumpiness makes it very difficult to fly the figures accurately.
For the two triplets I (unusually) deliberately flew below clouds so that you can see me rolling when I'm going upwards. Normally I would prefer to fly in smooth sink -- just call me wasteful!

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Bob Grimstead
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Posted Monday, July 4, 2011 @ 10:41 AM  

Hi Guys,

I was trying to figure out a sensible minimum height for display aerobatics, and to check whether the British 300 feet was sufficient, so I went up solo (a rare treat these days) and flew a few split Ss and reverse half Cubans, to check the height loss in each case. One would normally roll out from any botched inversion, but I wanted to see what height would be lost in a panicky (and completely incorrect) pull-out.

It seems the answer is 300 to 400 feet, given a good, hard pull towards the end.

http://www.youtube.com/user/FournierBob#p/u/0/2hBdaUKyDFs

http://www.youtube.com/user/FournierBob#p/u/1/hsiPZ7JIcmw

Just for fun; competition standard they ain't!

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

jb92563
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Posted Tuesday, July 19, 2011 @ 10:20 AM  

I enjoyed those clips....makes it look very easy.

I do notice its a little awkward to turn your camera on and off all the time.

What brand is it?

Are remote shutters available? Wouldn't it be nice to have a stick actuated camera?

I have a GoPro and a spare button on my stick so if I engineer a solution for a remote I can
share it with you as well.

I have been tinkering with Arduino processors, electronics, servos etc while building a UAV, and have plenty of spare
parts just looking for a purpose.

--------------------
Ray
RF4D #4057 N-1771 Rectimo 1400cc
http://picasaweb.google.com/jb92563/FournierRF4D
http://www.touringmotorgliders.org

Bob Grimstead
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Posted Wednesday, July 20, 2011 @ 09:35 AM  

Hi Ray,

It's a GoPro HD Hero, like yours, and I don't believe they have remote shutter releases.

I am also unable to find a free editing program that will allow me to edit the resulting MP4 files and chop off those unwanted first and last few seconds. Any ideas anybody?

You can see my mount on the appropriate thread.

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

jb92563
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Posted Wednesday, July 20, 2011 @ 10:12 AM  

I like to use MS Windows built in "Movie Maker" but the file needs to be converted to an AVI first
so use http://sourceforge.net/projects/mp4cam2avi/ (Free Open Source)

There is an interface port on the back of the GoPro and I believe I can make a cable and use that interface to do stuff like remote shutter etc.

If not then a tiny servo to physically trigger the button could work, but I will try the cable route first.

I'll let you know if I work out a solution.

[Edit by jb92563 on Wednesday, July 20, 2011 @ 10:16 AM]

--------------------
Ray
RF4D #4057 N-1771 Rectimo 1400cc
http://picasaweb.google.com/jb92563/FournierRF4D
http://www.touringmotorgliders.org

jb92563
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Posted Wednesday, July 20, 2011 @ 11:38 AM  

That did not take long. I found a solution for the GoPro Hero to make a remote shutter/power button.
http://goprouser.freeforums.org/the-gopro-hero-hd-bus-interface-t797-130.html

You need to put the camera in "One button Mode" to the mode of your choice so that when you power the camera on, it immediately starts recording.

The good news is that you also turn the camera Off/On via the button so it will save the battery.

All I need is an accesory port socket, some cable with a momentary contact button and a LED to confirm it is on or off.

Also, you can connect a remote Microphone plus line level signal amplifier via the port for better recordings.

Socket is $6 from Digi-Key, LED $0.25, Momentary on Switch $4 and some 6 conductor wire bundle (In case we want to add a mic later).

I am going to order the parts and assemble/test one, so if anyone wants a remote shutter let me know so I can order some extra connectors and once its working on my GoPro Hero I will build the others and send them out.

Update...

Well, after a bit more reading I could probably make a wireless remote that functions up to 25' for around $20 in case you want to wing tip mount your GoPro. http://benlo.com/msp430/GoProRemote.html

[Edit by jb92563 on Wednesday, July 20, 2011 @ 12:13 PM]

--------------------
Ray
RF4D #4057 N-1771 Rectimo 1400cc
http://picasaweb.google.com/jb92563/FournierRF4D
http://www.touringmotorgliders.org

Bob Grimstead
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Posted Thursday, July 21, 2011 @ 11:18 AM  

Hi Ray,

I bow deeply to the ease with which you understand this stuff.

If you saw my soldering, you would immediately see why I don't even bother trying to fiddle with electronics.

If you could possibly make up a harness with a remote shutter release or on/off button that would be great.

If somehow you could incorporate an input from the headphone jack, so that the camera's sound track can record our voice communications, that would be brilliant.

Better still would be if we could record our voices and the ambient cockpit/airflow/engine noise too. I guess that would mean some kind of male connector that would plug into the headset earphones jack socket on the panel, with a female socket into which I would them plug my helmet?

I'm not sure if this is possible, but I have long felt that you would all enjoy our clips more if you could hear the commands and occasional banter that takes place during our flying as well as the airflow rush and throttle closed buzzer.

Whatever you come up with Ray, I would like to buy one kit (and probably two, and possibly three, so that my son can have one too).

Thank you for investigating all this stuff.

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Bob Grimstead
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Posted Wednesday, August 31, 2011 @ 05:42 AM  

Hi Guys,

Yesterday my son James dropped by after a year away in Southern France and South Africa.

I was at last able to get from him his clip of the aerobatics we flew together in the Seighford Group's RF5 a couple of years ago.

It's short and sweet, just four manoeuvers. I hope you all enjoy it.

http://www.youtube.com/watch?v=TNjNf_dX_W4

Yours, Bob

--------------------
Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV

Jorgen
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Posted Wednesday, August 31, 2011 @ 06:12 AM  

Nice video Bob,
I noticed you flew with no headsets- the RF 5 (and 5b) is absolutely quite noticeable more quiet than the 4. Possible proof that most of the noice in the 4 is because compared to the 5, you basically sit with the engine in your lap. But then, you have no passenger to chat with, right?

For you 4 rennovators out there, maybe icreased firewall insulation + Dann's interesting muffler mod could be something to consider?

May the 4's be with you/ Jörgen

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