SZD-36 Cobra 15

On Jul 27, 12:46*pm, wrote:
I think there is a misunderstanding. There are two main screws at the
spar but non of the similar to the linked element.

On of them is vertical and similar to the IS28B2 main pin mechanism.
This attach and secure the two wings. It's unlikely to have failure
here.

Second one is horizontal behind the pilots head. This mechanism adjust
the wings horizontal play. This has to be fastened and secured after
assembly. One of my friend took off without this step... I can imagine
that high stress together with this mistake can be deadly.

Cobra is a robust plane, designed for aerobatics. Because of this
purpose wings are really heavy. Flight characteristics are friendly,
no bad habit like at stdCirrus (all moving tail). Performance is
around dry stdCirrus, stdJantar.

Wheel retraction system is a tricky rotating mechanism, careful
maintenance is needed for proper operation.

Instrument panel is small, limited space for instruments.

Baggage compartment is big, XC equipment can fit easily.

Not all Cobra is fired with CG hook! Winch launch with nose hook is
much lower.

It's a wooden plane with some composite material. Surface waveness can
change a lot by temperature, humidity. So don't worry if your nice
Cobra looks ugly one day, it will be nice again after a while

Conenction mechanism below the control stick is a bit weak. It's a
screw adjusted conical system and as dusk usually get's into that
place regular adjustment is needed. Usually this adjustment is a
tricky balancing between low control forces and small play.

If you are interested about some pictures here is my Cobra page:

http://bauerj.fw.hu/Cobra15/

http://www.sylacaugasoaring.com/SZD%...%20WARNING.htm

On Jul 27, 3:21*pm, Frank Whiteley wrote:
On Jul 27, 12:46*pm, wrote:



I think there is a misunderstanding. There are two main screws at the
spar but non of the similar to the linked element.

On of them is vertical and similar to the IS28B2 main pin mechanism.
This attach and secure the two wings. It's unlikely to have failure
here.

Second one is horizontal behind the pilots head. This mechanism adjust
the wings horizontal play. This has to be fastened and secured after
assembly. One of my friend took off without this step... I can imagine
that high stress together with this mistake can be deadly.

Cobra is a robust plane, designed for aerobatics. Because of this
purpose wings are really heavy. Flight characteristics are friendly,
no bad habit like at stdCirrus (all moving tail). Performance is
around dry stdCirrus, stdJantar.

Wheel retraction system is a tricky rotating mechanism, careful
maintenance is needed for proper operation.

Instrument panel is small, limited space for instruments.

Baggage compartment is big, XC equipment can fit easily.

Not all Cobra is fired with CG hook! Winch launch with nose hook is
much lower.

It's a wooden plane with some composite material. Surface waveness can
change a lot by temperature, humidity. So don't worry if your nice
Cobra looks ugly one day, it will be nice again after a while

Conenction mechanism below the control stick is a bit weak. It's a
screw adjusted conical system and as dusk usually get's into that
place regular adjustment is needed. Usually this adjustment is a
tricky balancing between low control forces and small play.

If you are interested about some pictures here is my Cobra page:

http://bauerj.fw.hu/Cobra15/

http://www.sylacaugasoaring.com/SZD%...%20WARNING.htm

http://www.ntsb.gov/ntsb/GenPDF.asp?...07LA066&rpt=fa

Uhh, horror...

So it was the main pin. I will ask around the local cobra, foka and IS
pilots. These pictures are really scarry!