[NSRCA-discussion] Airplane Weight

[Keith Hoard]

In addition, . . . if your calibration weights were calibrated on Eglin AFB (elevation 84 ft MSL), they will measure a different weight in Blytheville, AR (elevation 255.7 ft MSL) due to the relative distance to the center of the earth.

See how much easier all of this would be if we ditched the weight rule?

-Keith Hoard
-klhoard at outlook.com

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ronald Van Putte via NSRCA-discussion
Sent: Friday, January 27, 2017 4:52 PM
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] Airplane Weight

That’s right!  The Earth is an oblate spheroid.  Gotta factor that in.

Ron

On Jan 27, 2017, at 4:34 PM, Keith Hoard via NSRCA-discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>> wrote:

The rules also seem to neglect that gravity is not truly consistent at every place on the planet.  Perhaps that needs to be addressed in an upcoming rules cycle?

https:      //           en.wikipedia.org<http://en.wikipedia.org/>              /wiki                 /Gravity_of_Earth



From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Vogel, Peter via NSRCA-discussion
Sent: Friday, January 27, 2017 4:27 PM
To: Ronald Van Putte <vanputter at gmail.com<mailto:vanputter at gmail.com>>; General pattern discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>>
Subject: Re: [NSRCA-discussion] Airplane Weight

The "inconsistencies" are the inconsistencies between the pilots weighing equipment at home and the weighing equipment used at the contest.

So, if you count on your equipment being "dead accurate" and come with a 5050g airplane knowing it's 5050g, and the scales at the venue are off on the slightly heavy side, you will, in fact, be too heavy.  This, in fact, happened to Joseph at the last worlds, he knew he was heavy with that set of batteries, and the scale caught him.

The LIMIT is 5000g, the tolerance is there in case your scales or the venue's scales are a little bit off.  The limit is not 5050g.

Peter+
________________________________
From: NSRCA-discussion <nsrca-discussion-bounces at lists.nsrca.org<mailto:nsrca-discussion-bounces at lists.nsrca.org>> on behalf of Ronald Van Putte via NSRCA-discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>>
Sent: Friday, January 27, 2017 2:02:57 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Airplane Weight

Typo in second paragraph.  Should have been 5000gm, not 50000gm.  Sorry.

Ron

> On Jan 27, 2017, at 3:57 PM, Ronald Van Putte via NSRCA-discussion <nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org>> wrote:
>
> Something has been nagging me since the 2011 F3A World Championships.  The decision was made, over the objections of the official weighers (John Fuqua and me), that airplanes would be allowed to weigh 1% more than the listed maximum weight of 50000gm, or 50gm.
>
> The argument was that it “allowed for possible inconsistencies in measuring equipment”.  We objected because we had purchased calibration weights and had them verified by the Precision Measurement Equipment Laboratory on Eglin AFB (at the cost of a sixpack of beer per set of calibration weights).  That meant we knew exactly what the airplanes weighed.
>
> Now to the current situation.  Currently, AMA classes have a 1% weight tolerance, or 50gm.  Suppose a contestant’s model actually weighs 5050gm, but the weighing equipment is in error by 25 grams.  So the scales would measure the contestant’s airplane at 5075gm.  Remember that the 15 allowance is for "possible inconsistencies in measuring equipment”.  The contestant’s airplane is “too heavy”.
>
> Something to think about.
>
> Ron Van Putte
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