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Elevator bias spring

 
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jaybannist(at)cs.com
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PostPosted: Sun Jan 04, 2009 11:09 am    Post subject: Elevator bias spring Reply with quote
Any suggestions on finding the details about the elevator bias spring - CZAW drawing 6-BO-4CZ ?

Jay in Dallas
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david_a_g_johnson(at)btin
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PostPosted: Sun Jan 04, 2009 12:36 pm    Post subject: Elevator bias spring Reply with quote
Jay,

I (after much e-mailing) got the attached drawing from CZAW and I hope you find it more use than I did!

In the end I found out, from the UK agents, that all you need is a spring that will apply about 6 - 10 lbs of back pressure on the stick when the flap is lowered.

Dave Johnson

601XL Jab3300, almost ready for test flying AND GROUNDED!!!!!!

do not archive
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6-BO-5CZ.pdf
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jaybannist(at)cs.com
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PostPosted: Sun Jan 04, 2009 1:39 pm    Post subject: Elevator bias spring Reply with quote
Thanks for sending it, but, you are right. It is pretty much useless.

I was curious, because I had never heard of an "elevator bias spring". Now that I know what it is, I know I don't need one.

Jay in Dallas
Do not archive





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Martin Pohl



Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland
PostPosted: Mon Jan 05, 2009 2:15 am    Post subject: Re: Elevator bias spring Reply with quote
Jay & Dave

Have a look at the attached drawing 6-BO-4CZ: This is the installation of the "elevator bias spring" required by LAA UK on CZAW CH601XL.

Cheers Martin

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Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland
http://www.pohltec.ch/ZodiacXL/Main.html
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Terry Phillips



Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
PostPosted: Mon Jan 05, 2009 8:05 am    Post subject: Elevator bias spring Reply with quote
Martin

Does the LAA require the bias spring on aircraft that have the full width
elevator trim tabs (i.e., as changed in updates 2005b)? Or is it only
required on aircraft with the original, narrower elevator trim tabs?

Thanks.

Terry
At 02:15 AM 1/5/2009 -0800, you wrote:
Quote:
Jay & Dave

Have a look at the attached drawing 6-BO-4CZ: This is the installation of
the "elevator bias spring" required by LAA UK on CZAW CH601XL.

Cheers Martin


Terry Phillips ZBAGer
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons
are done; working on the wings
http://www.mykitlog.com/N47TP/

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Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings.
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Martin Pohl



Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland
PostPosted: Mon Jan 05, 2009 9:27 am    Post subject: Re: Elevator bias spring Reply with quote
Terry

Both full width elevator trim and elevator bias spring are required by UK LAA (see TADS: http://www.lightaircraftassociation.co.uk/engineering/TADs/162B%20ZENAIR%20CH601-XL.pdf).

I saw a flight test report that was issued by the test pilot of the UK LAA. He wrote that the aircraft is not trimmable with full flaps extended, even with the full width elevator trim.

Martin

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Martin Pohl
Zodiac XL QBK
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http://www.pohltec.ch/ZodiacXL/Main.html
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Terry Phillips



Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
PostPosted: Mon Jan 05, 2009 9:46 am    Post subject: Elevator bias spring Reply with quote
Thanks, Martin!
At 09:27 AM 1/5/2009 -0800, you wrote:
Quote:
Terry

Both full width elevator trim and elevator bias spring are required by UK
LAA (see TADS:
http://www.lightaircraftassociation.co.uk/engineering/TADs/162B%20ZENAIR%20CH601-XL.pdf).

I saw a flight test report that was issued by the test pilot of the UK
LAA. He wrote that the aircraft is not trimmable with full flaps extended,
even with the full width elevator trim.

do not archive

Terry Phillips ZBAGer
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons
are done; working on the wings
http://www.mykitlog.com/N47TP/

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Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings.
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chris Sinfield



Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia
PostPosted: Mon Jan 05, 2009 1:10 pm    Post subject: Re: Elevator bias spring Reply with quote
OK I cannot read the words about the size or strength of the spring required for full flap, anyone expand on this? and

how is it different from other XL's as I thought the Idea of the full size trim was so you can still do a circuit with full flaps and fly hands off with full elevator trim.?
Chris

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psm(at)att.net
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PostPosted: Mon Jan 05, 2009 1:36 pm    Post subject: Elevator bias spring Reply with quote
One thing which varies a great deal among XLs is the engine
weight. I think this could have a large impact on the trim required
under some conditions like full flaps.

Paul
XL getting close
do not archive

At 01:10 PM 1/5/2009, you wrote:
Quote:
how is it different from other XL's as I thought the Idea of the
full size trim was so you can still do a circuit with full flaps and
fly hands off with full elevator trim.?
Chris


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