Fred
As I said before I struggled with tip plates for a couple of years before settling (for now at least) on the method described. One of the things I think is important (whether or not you subscribe to the cambered tip plate idea) is to have a seal between the tip plate covering and the wing covering to get the most benefit from the tip plate. This means covering the inside surface of the tip plate which brings its own problems.
If you watch a flat wing/tip plate model flying at low speed you can see the covering on the tip plates inflating toward the inside. Maybe one day I will get a decent picture of this happening.
----- Original Message -----
From: Fred or Judy Rash
To: Indoor_Construction_at_yahoogroups.com
Sent: Sunday, November 09, 2008 10:09 PM
Subject: Re: [Indoor_Construction] Another Finny revision
Thanks, Bill, for your latest revised Finny design and particularly for showing the tip construction method.
My method was somewhat cruder and heavier than yours. I had been assembling flying surfaces with vertical tip plates first as one framework making sure the tips were glued only temporarily, then covering with one piece of film. After covering and trimming the film, I would soften the tip joints and reglue the tips standing on the ends of the LE and TE spars. Then thinned glue was applied ON TOP of the film to take up the slack. Your method should be lighter and neater. Perhaps I also should have tilted the end ribs, but did not.
Fred Rash
From: Bill Gowen
Sent: Saturday, November 08, 2008 10:36 PM
To: Indoor_Construction_at_yahoogroups.com
Subject: [Indoor_Construction] Another Finny revision
I finally did a better drawing of the tip plate instructions and
attached them to the Finny 09 plan as the second sheet of the PDF. I
also rotated the plan so you see it in the proper orientation when you
open the PDF.
If you want to print the plan full size, use 24 x 36 paper for the plan
and 11 x 17 for the tip plate instructions.
The tip plate instructions are pretty wordy but hopefully should be
easy to understand. The method described came about after several years
of building flat wing models and never being real happy with the tip
plates.
The Finny Man
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