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Author Topic: Wing area.  (Read 1187 times)

Offline Perry Rose

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Wing area.
« on: April 27, 2023, 04:36:51 PM »
For some reason I was wondering how much of an increase there would be in wing area by adding a couple inches to the span of a Twister wing. Using 50.5 span instead of the 48 and using the same flaps as shown on the plans. I figure the wing area would be 491 square inches. The plans say 490 in stock form. I measured the plans and did the math and came up with 470 square inches. That is a head scratcher. The only thing I can come up with is that the prototype was 50 inch span and the plans were changed with the exception of the wing area.
I may be wrong but I doubt it.
I wouldn't take her to a dog fight even if she had a chance to win.
The worst part of growing old is remembering when you were young.

Offline Ken Culbertson

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Re: Wing area.
« Reply #1 on: April 27, 2023, 06:01:21 PM »
For some reason I was wondering how much of an increase there would be in wing area by adding a couple inches to the span of a Twister wing. Using 50.5 span instead of the 48 and using the same flaps as shown on the plans. I figure the wing area would be 491 square inches. The plans say 490 in stock form. I measured the plans and did the math and came up with 470 square inches. That is a head scratcher. The only thing I can come up with is that the prototype was 50 inch span and the plans were changed with the exception of the wing area.
It doesn't answer your question but I added one rib 4" to mine (1 rib one each side) and it flew really great.  Never did the area math.  Did all of the other "Fancher" mods too.

Ken
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If it is not broke you are not trying hard enough.
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Offline Dave Hull

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Re: Wing area.
« Reply #2 on: April 27, 2023, 07:17:54 PM »
Perry,

It looks to me like the plans I have are the same--and I would guess that the copying process had a minor scaling issue. Mine measure out to about 47-5/8" which would equate to less than a 1% scaling error when compared to the claimed wingspan of 48".

If I run the numbers using the claimed wingspan of 48", I get 472.5 sq. in. Still not quite the claimed 490 sq. in. on both the box and the plans.

There's a story somewhere--and it looks like it is in the original math....

On the Twister I built I added extended, shaped-block tips which added about 3" span per side. They look nice, but I should have done more lightening (thinning) work.

Dave

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Re: Wing area.
« Reply #3 on: April 27, 2023, 08:41:30 PM »
YEA .

The PAPER can expand / contract maybe 3/4 inch to a A1 sheet , from humid cool to schorching dry . so like horsepower , needs a Std. barometer Correction .  S?P



Eres Mr Fanchers contribution .

Four Ninty and Fourty eight , are almost the same , bar a decimal place or two .So an inch is ten . More or Less . So four inches is fourty , twice is eighty . But if its eight its thirty two . Twice .

Ahem , if the CHORD of the ribbed bits EIGHT , ya getta bout 30 a side , so a extra 60 or 65 or so . thereabouts . Which is about 10 % more area . or , at the same weight , 10 % less loading .
Or can Go Harder , before you load it up to the Std. limit .  VD~


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