ggower_99(at)yahoo.com
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 Posted: Mon Nov 24, 2008 3:53 pm Post subject: Spreading fear about the XL. |
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Hello Dirk,
You forgot to mention at least two other groups:
The "Armchair Experts". They will never build or fly one. A real big group maybe mayority
The "Bad Mouths" Also neither builder pilots of this airplane, but specially paid by competitors to keep people scared 
Saludos
Gary Gower
601 XL Jab 3300 Builder.
710 STOL 912S 230 hrs of FUN flying.
PLEASE Do not archive.
--- On Mon, 11/24/08, Dirk Zahtilla <ideaz1(at)sbcglobal.net> wrote:
[quote]From: Dirk Zahtilla <ideaz1(at)sbcglobal.net>
Subject: Re: Spreading fear about the XL
To: zenith-list(at)matronics.com
Date: Monday, November 24, 2008, 10:56 AM
You forgot the 640 which also has unbalanced ailerons HOWEVER... it has push-pull tubes instead of cables and boxed wing spars (more related to the load carying capacity).The margin between cruise and VNE is much closer than the XL design. Maybe we need to look at this!? As I look at the designs, they become capable of increasingly high cruise speeds and with builders putting more h.p. in it becomes very easy to reach VNE very quickly by entering even a very shallow dive. (also the rudder on the 6,7,&8 series ARE balanced, note the portion of the rudder ahead of the hinge points...this is aerodynamic balance as opposed to weight balance).
I think that what we are seeing is two groups of builders here: one group who builds and fly's well within the specs of the design, and one group that wants to achieve everything to the edge of the envelope and perhaps a bit beyond. One group is made of builder/flyers, and one group is made of experimenter builders/test pilots. This latter group will always push aircraft design firms to re-examine their designs and hopefully this will benefit the first group who will end up flying increasingly safe and more capable aircraft.
I'm sure that no-one on this list means to offend the builder/flyer group, I know I don't. We are just part of the group that reaches out to extend our potential.
I am building a 601XL (which I may re-designate as 601XLA(airobat)orM(modified) just to make it clear that it is not totally to plans) As I have said before I will use push-pull tubes for the ailerons and elevator and balance both as well. The ailerons will move the hingepoint rearward and the elevator will use weights in the tips which will be attached to the elevator instead of the horizontal stab. I will also use a boxed spar in the wing that meets at the center instead of bolting on at the outer part of the fuselage.
Dirk Z
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