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Date: Mon, 26 Aug 2013 16:14:26 -0400
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From: Roger Iverin <roger@iverin.com>
Subject: Re: [LML] Re: Winglets/lighting.
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Thanks,

This is a very nice summary of an complicated report.... Just what I 
needed.

As I see it's no idea to put energy in develope an nice looking winglet.

I rather stay with the original wingtip.....

This takes me to the next level:

Anyone have an original wingtip nut cutted as delivered from Lancair ?


Antother question is: I think the wingtip was pretty heavy ?
Is it any idea to mold in plastic or thinner carbon as material.

Please gents let me know about anyone have interest in premade LED 
lights.


Best regards
Roger Iverin


On 2013-08-26 19:28, Chris Zavatson wrote:
> Roger,
> Winglets are effective at high lift coefficients. They add some
> parasitic losses while reducing induced drag. For this trade to make
> any sense however one needs to be operating at a lift coefficient that
> produces significant induced drag. In the 320/360 most operation is at
> a CL between 0.2 and 0.3. The link below is to a paper showing the
> effects of winglets on a Bonanza. The cross over point was at a CL of
> 0.3. For us to cruise and greater than 0.3 we would need to fly really
> high and really heavy. I am assuming WOT here. Part throttle will
> allow for higher lift coefficients. If you are trying to maximize
> range at the expense of top speed winglets could be useful.
> The big boys flying at 30-40k do operate at high lift coefficient that
> make winglets effective in cruise.
> 
> http://n91cz.com/Interesting_Technical_Reports/NASA_TM81892.pdf [1]
> 
> Chris Zavatson
> N91CZ
> 360std
> http://www.n91cz.net/ [2]
> 
>  FROM: Roger Iverin <roger@iverin.com>
>  TO: lml@lancaironline.net
>  SENT: Monday, August 26, 2013 5:02 AM
>  SUBJECT: [LML] Winglets/lighting.
> 
> Gents,
> 
> I'm in the progress getting made modern led lighting for the 320/360.
> 
> In this progress I also trying figure out the effect of winglets.
> I have seen pictures of 320/360 with winglets.
> But I would like to know about the performance changes.
> 
> In both this I would like to buy or borrow wintips as delivered with
> KIT. (making a mold)
> NOT anything done, sanded or anything to make sure it's as original as
> 
> possible.
> 
> I have already wingtips, but they cutted for lenses.
> 
> Regards the lighting I'm trying to get a kind of cofoundig for the
> first
> ones.
> 
> This is the company and the inspiration:
> 
> http://www.aveoengineering.com/index.php/products-1/custom-projects/conforma-ziptips-for-vans-and-f-1-rocket
> [3]
> 
> But I'm open for all options.
> 
> Please share with me your ligting ideas and winglets experince.
> 
> Please contact me on list or off list!
> 
> Best regards
> Roger Iverin
> 
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html [4]
> 
> 
> 
> Links:
> ------
> [1] http://n91cz.com/Interesting_Technical_Reports/NASA_TM81892.pdf
> [2] http://www.n91cz.net/
> [3]
> http://www.aveoengineering.com/index.php/products-1/custom-projects/conforma-ziptips-for-vans-and-f-1-rocket
> [4] http://mail.lancaironline.net:81/lists/lml/List.html