Production of the Tanita 1210-100 has ended. Tanita replaced the Tanita 1210-100 with the 1213, but the feedback we received from our customers was they did not like the new model. Customer's did not like the high cost for limited weighing capacity and features and they liked much better the AND Weighing FX120i, Ohaus AX223, Scientech ZSP150, Sartorius ENTRIS323-1S or Sartorius ENTRIS64-1S.
Indoor free flight model airplanes can
weigh as little 400 milligrams and can be as heavy as 7.00 grams. These
models are powered by a loop of thin rubber strip which can be wound with over
2000 turns, and the flight times can vary from a few minutes in duration to
over one hour! For maximum flight times and consistency, accurate record
keeping is important. The length, weight, thickness, and even vintage
of the rubber band motors used is critical in how long the model flies.
F1D is an international event flown in many countries throughout the world, and every two years the Indoor World Championships are held. Here each competing country is represented by the top three fliers of their country. These models have a wingspan limit of 55cm, a minimum weight of 1.200 grams, and fly approximately 35 minutes per flight. Additionally, there is a restriction that the rubber motor shall not weigh more than 600 milligrams. Because of this restriction, each milligram of rubber band not used results in about 3 seconds of lost flight time. At world competition level, three seconds can be the difference between first and third place!
To ensure rubber motors are as close
to possible to the 600 milligram limit, modelers need to be able to size the
rubber motor accurately and quickly at the contest site during the event.
To be able to do this, an accurate scale is needed. Additionally, because
many of the flying sites do not have easily accessible electrical power outlets,
if they have any at all, the scale must have the feature of being both battery
powered and easily transported. After trying many types of scales, both
of the mechanical and digital variety, a vast majority of the modelers have
now settled in on the Tanita 1210-100 as their preferred choice for weighing
rubber motors. The Tanita1210-100 offers a 20 gram capacity, double the capacity
of the Tanita 1210-50, as well as a .002 gram resolution. This pocket
scale combines all the desirable features needed. It is very accurate,
small in size, portable, and very economical. All this makes it the perfect
match for indoor modelers around the world.
A common phrase in the indoor community is ‘matching the prop and rubber’. This means that the rubber motor needs to be sized accordingly to the propeller on the model. Some models have large slow spinning propellers, and other have smaller faster spinning propellers. ‘Matching the prop and rubber’ in these cases would mean a short thicker loop for the slow spinning prop, and long thin loop for the smaller faster spinning prop. Interestingly, the motors may weigh exactly the same, but the length and thickness varies because of the size of the prop being used. This is why knowing the weight of the motor being used is very important during test flights and trimming, and the Tanita 1210-100 is an essential tool during this process.
After looking at many web sites, Precision Weighing Balances had the lowest cost anywhere for this scale. They also had the widest selection of scales I have seen anywhere. Many modelers have a selection of different scales with different capacities and resolutions for use in different segments of the model building process. For example, the Ohaus SP202 portable toploading scale offers a 0.01 gram resolution and a 200 gram capacity which makes it excellent for weighing large sheets of balsawood at the hobby shop. The weight of the sheet wood is used to determine the density of the sheet, and is a key factor in the final weight of the model. The wide selection offered, and the low cost makes Precision Weighing Balances a one stop shop for all our modeling needs.
Additional web sites relating to indoor free flight model aircraft include:
You can also join us on the indoor free flight mailing list on Yahoo at http://groups.yahoo.com/group/indoor/join
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