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Elevator travel (throw or deflection) printer friendly version
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Bob Grimstead
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Posted Monday, January 6, 2014 @ 08:06 AM  

Hi Guys,

Original, French Fournier RF4 manuals give the acceptable elevator travel as 20° up and down, plus or minus 2°.

Later editions also give 20° up and down, but the tolerance has reduced to +/-1°.

However, when I bought G-AWGN (the red one) its elevator was rigged to +25° and -15°, and its manual had been amended appropriately.

I remember checking this at the time, and finding a more modern manual edition that quoted +25°/-15° (+/-1°) as the correct figures.

However, I cannot now find the source for those later numbers.

Does anybody out there have an RF4 Flight Manual or any other documentation which quotes the correct elevator travel as +25/-15°?

If so, would they please scan and post the page?

Thanks very much.

Yours, Bob

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

Markku
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Posted Tuesday, January 7, 2014 @ 04:15 AM  

Hi Bob
You can check those figeres from Type Certificate Data Sheet LBA 666, which will be found in the net. I remember that the original values were 20deg on both sides, but it's changed, the last revision tells: Höhenrudder 125+/- 5mm nach oben, 83+/- 5mm nach unter, which obviouslu equals 25/15 deg
Markku
Bob Grimstead
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Posted Tuesday, January 7, 2014 @ 04:42 AM  

Thanks Markku,

I will look for that.

Just be aware everybody that if you change your elevator travel to +25/-15, then you must never try to fly upside-down, because you will not be able to hold the nose above the horizon to fly level, inverted.

I discovered this at 500 feet over Little Rissington, something I shall never forget, and an experience I would have preferred not to have undergone.

Yours, Bob

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

Roger.Camp
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Posted Tuesday, January 7, 2014 @ 08:12 AM    YIM

Hi Guys,

just checked the LBA database. LBA 666, rev 8 is dated 28.08.1990. Is this the latest. If so it states in the data sheet: Elevator: Up and down each = 118 mm +/- 10 mm measured 320 mm from the hinge C/L.

Roger

--------------------
It takes 1.460 bolts to build an aircraft and 1 nut to spread it over the landscape

Markku
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Posted Tuesday, January 7, 2014 @ 10:08 AM  

Yes, it's the same revision, but if you read carefully, those are the figures for RF-4, but RF-4D has different angles (both in the same LBA, as well as the RF-3)

Edit: I wonder why those figures differs with RF-4 and RF-4D, to my knowledge it's more or less the same plane?

[Edit by Markku on Tuesday, January 7, 2014 @ 10:17 AM]

Donald
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Posted Wednesday, January 8, 2014 @ 02:42 AM  

Wow! On the last page of that document does it really say that aerobatics are not permitted?
Bob Grimstead
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Posted Wednesday, January 8, 2014 @ 10:50 AM  

It gets worse!

There is a later document, the RF4 Fiche de Navigabilite, dated November 1997.

That states elevator travel to be 20* up and 20* down, but with a +/- 2* tolerance.

Using all those numbers, presumably one could have an acceptable elevator movement of 27* up and 22* down?

I guess this is what happens when you don't let a responsible, knowledgeable person (Rene) hold the Type Certificate!

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
Captain

Gender: Male
Location: Perth, Western Australia or West Sussex, England
Registered: Dec 2006
Status: Offline
Posts: 2027

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Posted Wednesday, January 8, 2014 @ 10:58 AM  

And do NOT attempt aerobatics with that dangerous 25* up, 15* down setting.

I have no objection to the 25* up, but 15* down is completely insufficient!

As I write this, I am in the process of applying to Britain's LAA for approval to set my elevator travel to 25* up, 20* down, +/- 2*

Don't hold your breath. LAA modification approvals seem to take a minimum of three (yes 3!) months.

Yours, Bob

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

Roger.Camp
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Posted Saturday, January 11, 2014 @ 03:55 PM    YIM

Hi Bob, the delay is probably due to the tremendous overload on Pope Francis´s desk. hehe

Thank the lord i dont have to deal with them with my project.

[Edit by Roger.Camp on Saturday, January 11, 2014 @ 03:57 PM]

--------------------
It takes 1.460 bolts to build an aircraft and 1 nut to spread it over the landscape

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