[NSRCA-discussion] AMA weight limit

[Earl Haury]

The AMA rules take a little bit of liberty with the conversion from kg to 
lb, (5kg = 11.023# or 11# is 10.5g short of 5kg) but both are mentioned as 
equal. The 5kg limit is then the max allowed by the rules, as Matt stated. 
FAI is 5000g with a 1% tolerance for instrument variance.

Another couple of subtle differences exist in sound measuring. AMA specifies 
measurement with the meter on the right side and downwind. FAI specifies the 
meter on the right side with the nose of the model pointing into the wind. 
As with the weight tolerance, AMA specifies a limit of 96dBA with no 
tolerance, while FAI specifies a limit of 94dBA with a tolerance of the 
meter specs. (likely 1.dB - not sure of the spec of the Simpson meters AMA 
has).

It's unwise to count on an instrument being exactly accurate and worse to 
assume the tolerance to be in your favor. FAI included the allowance to 
prevent unfair DQ in the event an instrument is more critical. For example - 
a balance with +-1% accuracy could weigh a 5000g model over or under 50g, 
guess what happens if it's weighing 1% heavy and yours is actually 5050.

Earl


----- Original Message ----- 
From: <rcmaster199 at aol.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Monday, July 14, 2008 8:57 AM
Subject: Re: [NSRCA-discussion] AMA weight limit


> The FAI regulation is 5.0 kilos. At the urging of Dean Pappas, the 
> regulation was modified to include +1% to account for typical weighing 
> scale precision issues. It's a reasonable assessment of typical scale 
> precision.
>
> The AMA, to the best of my knowledge, has not followed this thought 
> process, possibly because an adequate proposal was not made. The AMA 
> regulation is 5.0 kilos, including the lack of scale precision.
>
> MattK
>
> -----Original Message-----
> From: chris moon <cjm767driver at hotmail.com>
> To: nsrca-discussion at lists.nsrca.org
> Sent: Sun, 13 Jul 2008 7:58 pm
> Subject: [NSRCA-discussion] AMA weight limit
>
> I had this come up the other day and it was my understanding that the 1%
> deviation on weight was an FAI rule change and that did not
> automatically make it  apply to AMA classes as well.  Is this not
> right?  FAI can go to 5050g  but AMA is still 11lbs (5kg).  And if we
> want to get technical, 11lbs does not equal 5kg so which would it be?  I
> think the regs state 11lbs max weight in AMA classes.
>
> Chris
>
>
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