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UK LAA mods - official information

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Martin Pohl

Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland

Posted: Tue Sep 01, 2009 7:45 am Post subject: UK LAA mods - official information

Have a look at UK LAA's homepage:

http://www.lightaircraftassociation.co.uk/engineering/engineering_updates.html



Cheers Martin

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

sabrina

Joined: 15 Jun 2009
Posts: 170

Posted: Tue Sep 01, 2009 2:19 pm Post subject: Re: UK LAA mods - official information

Do Not Archive

Last edited by sabrina on Mon Sep 28, 2009 2:11 pm; edited 1 time in total

psm(at)att.net
Guest

Posted: Tue Sep 01, 2009 5:21 pm Post subject: UK LAA mods - official information

Hi Sabrina,



I was thinking of implementing the aileron balance change and looking 

at the spar carry-through reinforcement with no real idea about what 

it does or whether it is necessary or not.



I called and talked to Sebastian Heintz a few days ago and learned 

that Chris is planning to issue comments on the LAA changes soon (a 

couple of weeks?).  For now I intend to wait until we hear from Chris.



I looked at the complete LAA document and learned their design change 

only applies to planes with hinged ailerons.  My plane has hingeless 

ailerons, so it is doubtful the LAA changes would work well for 

me.  Also, I got the idea that their changes were based on CZAW 

planes which are somewhat different from Zenith kits.



My original reason for calling Sebastian was to see if he had the 

weird 20 x 20 mm square tube called out for the mass balance arm.  I 

couldn't find any on the net and figured he might have some in 

stock.  He said that when they issued the engineering change for the 

mass balance it would use materials readily available here.

I want to implement aileron mass balance and install a fix for the 

control system oversensitivity.  I understand Chris has developed a 

simple change to add some springs to the elevator controls, and I 

still don't know how to handle the aileron balance issue.



Paul

XL awaiting engineering changes

At 03:19 PM 9/1/2009, you wrote:

 	  Quote: 	
		  Paul...   which LAA suggestions are you going to follow?

What about this 35% reduced to 30% MAC...



I have always seen/used 30% MAC...



Even at 30% MAC, 1320, full aft CG, the airplane is squirrelly...



Has anyone on this list conducted test flights at 35% MAC, 1320, 

full aft CG?



How many of the crashes were 35% MAC aircraft?



Am I reading the report correctly, they are removing their 

previously required elevator bias spring?



Reducing aileron cable tension to as low as 15 pounds?   (20 +/- 5)

Pete54

Joined: 27 Aug 2009
Posts: 19
Location: Scotland

Posted: Fri Sep 04, 2009 2:34 am Post subject: Re: UK LAA mods - official information

I can add a little info on the C of G and trimmer issues from the LAA.



Back in February there was talk from them of slowing down the trimmer.  The UK aircraft all have to have the large elevator trim tab.  This gives a lot of trim authority and was 'necessary' for the initial UK acceptance.  CZAW added the flap interconnect and many aircraft (like mine) have both.



There was a flight test programme which extended the c of g range to 530mm from 455.  During the recent trials the interaction between the interconnect and larger trim tab showed the potential for the longitudinal stability to be compromised.  The quick and dirty solution is to de-power the trimmer by turning the horn around.  Apparently removing the interconnect increases the longitudinal stability quite a bit.  We'll find out when we get to test fly the aircraft.



We'll have to carry out all the mods to get clearance to fly - that is just the way things are in the UK.  Once we are flying there may be some potential for optimisation but after nearly 11 months of being grounded I'm just going to roll with it.



I have flown my aircraft with the c of g at around 500mm, it felt pretty 'relaxed' and needed careful attention to pitch control.  The rumour is that the UK aircraft modified so far need a little nose ballast to stay within the c of g limits.

_________________
Pete Morris

chuck_maggart

Joined: 20 Mar 2007
Posts: 16
Location: St. Louis

Posted: Sat Sep 05, 2009 7:46 am Post subject: Re: UK LAA mods - official information

Pete, I'm curious about where and how nose ballast is added to a 601XL.  My weight and balance indicate that some nose weight might be desirable.



Chuck Maggart

Finished and ready to fly

_________________
Chuck Maggart

sabrina

Joined: 15 Jun 2009
Posts: 170

Posted: Sat Sep 05, 2009 9:31 am Post subject: Re: UK LAA mods - official information

Do Not Archive

Last edited by sabrina on Mon Sep 28, 2009 2:11 pm; edited 1 time in total

Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Sat Sep 05, 2009 12:20 pm Post subject: Re: UK LAA mods - official information

Where's your battery now?

_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

Pete54

Joined: 27 Aug 2009
Posts: 19
Location: Scotland

Posted: Sun Sep 06, 2009 4:59 am Post subject: Re: UK LAA mods - official information

The easiest choices seem to be the prop adapter or a heavier prop.  I'm hopeful it will not be necessary on my aircraft (Warp Drive and prop extension) we'll see!

_________________
Pete Morris

chuck_maggart

Joined: 20 Mar 2007
Posts: 16
Location: St. Louis

Posted: Sun Sep 06, 2009 10:22 am Post subject: Re: UK LAA mods - official information

 	  Sabrina wrote: 	
		  a metal prop moves that CG forward fairly well... 	




Is there a metal prop for the Jabiru 3300?  I would rather have a metal prop.



Chuck Maggart

_________________
Chuck Maggart

chuck_maggart

Joined: 20 Mar 2007
Posts: 16
Location: St. Louis

Posted: Sun Sep 06, 2009 10:23 am Post subject: Re: UK LAA mods - official information

 	  Gig Giacona wrote: 	
		  Where's your battery now? 	




The battery is mounted on the firewall.



Chuck Maggart

_________________
Chuck Maggart

chuck_maggart

Joined: 20 Mar 2007
Posts: 16
Location: St. Louis

Posted: Sun Sep 06, 2009 10:25 am Post subject: Re: UK LAA mods - official information

Thank you, Pete.  I would like to have a metal prop, but don't know of a suitable one that would work on a Jabiru 3300.



Chuck Maggart



 	  Pete54 wrote: 	
		  The easiest choices seem to be the prop adapter or a heavier prop.  I'm hopeful it will not be necessary on my aircraft (Warp Drive and prop extension) we'll see!

_________________
Chuck Maggart

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