How do I legallly install winglets on a standard airworthiness certificate?

At 16:39 20 November 2010, Scott Alexander wrote:
A friend in my club built a pair of winglets for his Standard Cirrus.
His glider is expirmental, mine is not. The total cost for him was
just a hundred dollars for supplies, and some free guidance from a
local IA/AP. The finished product looks fantastic! The mold came
from an American Spirit, which I believe is a copy of the Ventus. And
the result is that his handling has improved quite a bit. He did do
some adjustments on the toe-out angle to fine tune it which
supposively helped.

I would like to do the same thing with mine using the exact same
molds. My Cirrus is a standard airworthiness certificate. If I were
to do the factory winglet or the Maughmer winglet, the cost is between
3,000-5,000 when it's all said and done. So that being said, this
option, looks very appealing.

Has anyone in this group dealt with the same sort of deal? I would be
willing to change my standard airworthiness certificate over to an
expiremental if that is the best solution. Any guidance is much
appreciated.

Thanks,
Scott

PS Happy Thanksgiving.


If it was me, Id go with the factory, or atlest the STC. Remember,
the value of the glider will probably rise as much as invested.
Maby im wrong, but maby the valu will be lower than now when
in experimental alternative. How would u think if you was a
intrested buyer of that glider?

Im sure youre friends winglets improved handeling. But Im also
sure factory or Maughmer performes even better!! Its just much
more engineering and testing behind it!!
It might be cheaper in the end, when you want to sell for upgrading to a
Discus2!! =)


Just a thouhgt.

On Nov 24, 1:20*pm, Johan Nykvist wrote:
At 16:39 20 November 2010, Scott Alexander wrote:



A friend in my club built a pair of winglets for his Standard Cirrus.
His glider is expirmental, mine is not. *The total cost for him was
just a hundred dollars for supplies, and some free guidance from a
local IA/AP. *The finished product looks fantastic! *The mold came
from an American Spirit, which I believe is a copy of the Ventus. *And
the result is that his handling has improved quite a bit. *He did do
some adjustments on the toe-out angle to fine tune it which
supposively helped.

I would like to do the same thing with mine using the exact same
molds. *My Cirrus is a standard airworthiness certificate. *If I were
to do the factory winglet or the Maughmer winglet, the cost is between
3,000-5,000 when it's all said and done. *So that being said, this
option, looks very appealing.

Has anyone in this group dealt with the same sort of deal? *I would be
willing to change my standard airworthiness certificate over to an
expiremental if that is the best solution. *Any guidance is much
appreciated.

Thanks,
Scott

PS Happy Thanksgiving.

If it was me, Id go with the factory, or atlest the STC. *Remember,
the value of the glider will probably rise as much as invested.
Maby im wrong, but maby the valu will be lower than now when
in experimental alternative. *How would u think if you was a
intrested buyer of that glider?

Im sure youre friends winglets improved handeling. But Im also
sure factory or Maughmer performes even better!! *Its just much
more engineering and testing behind it!! *
It might be cheaper in the end, when you want to sell for upgrading to a
Discus2!! =)

Just a thouhgt.

There are no STCs. So the aftermarket winglets on certified gliders
must be being done via a 337.

Darryl