Big Zac (2.802 DT 2012) (4.20 Diaz 2011)
Unofficial Utah State Record! I will need to get it certified after the long holiday.
Weight estimates based on daily measurements came in way under actual harvest weight with this one. I did harvest in the morning after the heaviest rainfall we’ve had in months, but that would likely have added only a few grams. There’s a much better explanation for this significant underestimate of actual weight.
Inherent potential bias with using calipers with short “fingers”. I tried to measure in the same places on the tomato each day. Comparisons of measurements ON vs. OFF the vine:
ON THE VINE: D1=16.50, D2=14.81, D3=8.34, so weight estimate = 0.49742*16.50*14.81*8.34=1,013.7 g (2.235 lb.)
OFF THE VINE: D1=16.52, D2=14.90, D3=10.23, weight estimate = 0.49742*16.52*14.90*10.23=1,252.6 g (2.761 lb.), which is within 2% of actual weight.
Obviously, it’s the D3 dimension (height) which lead to a signficant underestimate of the weight. As mentioned in previous posts, this was a very flattened tomato. The “fingers” of my calipers are only 2″ long, so they did not come close to reaching the bulging center of this tomato for measurements. A better instrument would have likely resulted in better estimates.
For the logically more precise use of circumferences for estimating ellipsoidal volume, here are the calculations:
CC1=44.7, CC2=36.6, CC3=50.2 (~19.8″ taped), so weight estimate = 0.016043*44.7*36.6*50.2=1,317.9 g (2.905 lb.), which is within 4% of actual weight.
More pics to come following official weigh-in.
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P.S. (9-04-2012) – I decided not to get this one certified. This morning I taped the three circumferences of the largest Church (from 3.36 Perry 2008) still growing on the vine. At 39 days along (and very little recent growth), it measures to 2.99 lbs. Since it has very few geometrical irregularities, I think it has a very good chance of surpassing 2.8 lbs.
P.P.S. (9-17-2012) – I kept this one refridgerated for 13 days before it started to degrade to the point of leakage. On 9-07-2012, 5 days after harvest, it weighed 2.722 lbs. On 9-14-2012, 13 days after harvest, it weighed 2.638 lbs. This works out to about a 0.45% weight loss per day.
Final pics added to slideshow above.