[NSRCA-discussion] Airplane Weight

[Ronald Van Putte]

The problem is that you need a pretty massive balance system and calibration weights.  Quality calibration weights will cost in excess of $65.  What contest director/Nats R/C Aerobatics event manager is willing to fork out that kind of $$$$?

Ron Van Putte

> On Jan 28, 2017, at 11:32 AM, James Oddino <joddino at socal.rr.com> wrote:
> 
> The point was that the limit is on the mass of the model not on the force it exerts due to gravity.  If you use a balance you will measure its mass (same on the moon) and not be affected by gravity and all of the stuff that affects force measuring devices.
> 
> Jim
> 
> 
> On Jan 27, 2017, at 4:38 PM, Ronald Van Putte via NSRCA-discussion wrote:
> 
>> I dunno.  I don’t planning on going there.
>> 
>> Ron
>> 
>>> On Jan 27, 2017, at 6:36 PM, James Oddino <joddino at socal.rr.com> wrote:
>>> 
>>> What is the weight limit on the moon?
>>> 
>>> Jim Oddino
>>> 
>>> On Jan 27, 2017, at 2:02 PM, Ronald Van Putte via NSRCA-discussion wrote:
>>> 
>>>> 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> 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 5000gm, 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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