[NSRCA-discussion] Bowtie

Tue Jul 5 17:09:35 AKDT 2016

Don't you guys look at the AMA class power points?
Jim

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Peter Vogel via NSRCA-discussion
Sent: Tuesday, July 05, 2016 12:22 PM
To: Jeff and Claire; General pattern discussion
Subject: Re: [NSRCA-discussion] Bowtie

IMHO, yep.  In fact, It's really just the general case of the Double-I that says the non-radius portion of the maneuver must be a square, so the diameter of the half-loops = the length of the lines at the top and bottom of the Double I.

On Tue, Jul 5, 2016 at 12:01 PM, Jeff and Claire via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
Thanks.  Same drawing applies to the hourglass if it were turned 90deg, right?  

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Vicente Bortone via NSRCA-discussion
Sent: Tuesday, July 05, 2016 8:26 AM
To: chuenkan at comcast.net; General pattern discussion
Subject: Re: [NSRCA-discussion] Bowtie

I think this will make it more clear.  

Inline image 1
On Saturday, July 2, 2016, Phil Spelt via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
Yes, Stuart, my maneuvers all look much better in PaintShop or PowerPoint than they do in R/C airplane!

Phil Spelt, KCRC Emeritus
AMA 1294, Scientific Leader Member
SPA L-18, Board Member
Oliver Springs, TN  (865) 435-1476v  (865) 604-0541c

  _____  

Yup try to draw it with radii.  Only if your corners are points (pretty tough on the plane) will the maneuver be square.  
I actually used Corel Draw where I could be sure all radii were equal to see how it should look.  Now if I could only fly it that way :)
Stuart C.  

On 7/1/2016 1:49 PM, cahochhalter via NSRCA-discussion wrote:
The radius locations of the bowtie create a rectangle.

See attached drawings.

Drawing courtesy of Mark Hunt

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Verne Koester via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> 
Date: 7/1/16 12:35 PM (GMT-06:00) 
To: NSRCA <nsrca-discussion at lists.nsrca.org> 
Subject: [NSRCA-discussion] Bowtie 
I just read the Judges Chair in the latest K-Factor regarding the Bow Tie in Masters. Their opinion is that the overall shape of the maneuver should form a rectangle rather than a square. I can’t see how that’s geometrically possible. The center portion of the maneuver has two opposing 45 degree lines. Assuming we want the baseline and top line height the same and we want the maneuver centered, the 45 degree lines mandate an overall square shape. The only way to make a rectangle out of it is to either fly an angle of less than 45 degrees through the center or add short straight lines before and after the 45’s going into the radiuses into the verticals. The illustration in the K-Factor showing how the Bow Tie should be shaped illustrates this because the center angle lines in their rectangle drawing are clearly less than 45 degrees. The Masters aresti shows the correct overall shape and it’s square.

Verne Koester  

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Vicente "Vince" Bortone

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