lml@lancaironline.net ?????????????

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

Chris Zavatson

N91CZ

360std

http://www.n91cz.net/

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

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

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