Some comments to various previous messages on the list....
> All serious flyers I know still use Tan II, so we don't take pains to
experiment with something we won't be using in competition any time
soon. But
Tapio L has posted Super Sport energy data a few times. It's often
reported that good batches of Super Sport is as good as many or most
batches of Tan II, just not as good as the top 3-5 batches of Tan II (of
course.)
Yup. Pic attached. The worst Tan II is about 5% less than the best, the
best SS about as bood as worst Tan II, and the worst SS 5% less than the
best SS (i.e. 10% less than best Tan II). But the best SS that I have
tested was from '04, has not been that good ever since, although the Jan
09 batch may be good, concluding from the fact that it was stolen from
the hands of mr. Clapp in Max Men, my fellow countryman failed to get a
box that he thought was agreed on....
> <<Are newcommers with only current rubber choice at a disadvantage
> compared to Tan II flyers - how much of a disadvantage?>>
>
>
>
I'd say that it is less than 10%, as it all boils down to how well you
can use the rubber, but also I suspect that the torque curve plays a
part. SS has flatter TC, in other words after initial peak it drops
more, but the torque is then more constant, which means less variation
in the vertical velocity. i think for a fixed-pitch prop and low ceiling
this could actually mean an advantage to the model, slower climb to
roof. At least my experience with the "less serious" classes has been
that e.g. 2006 batch of SS works real good, have not felt a need to try
Tan II on those beginner models. Even in contest.
> I fly F1B and test all my motors. I have 2/99, 3/99, 3/02, 10/97 and
5/99 rubber. Only the 5/99 rubber is better than the last batch of super
sport I've tested (6/06). The difference is about 10% as Marc estimated.
I disagree here, as my graph does.
> If I can infer from the below that your tests show 5/99 is 10% better
than 3/02 then I think you got hold of a really bad batch of 3/02.
My graph does not show the standard deviation of energy return between
individual motors, but I have not found it to be more than 1 to 2%, in
other words, variation within a batch is much less than between batches.
Of course, my testing is from one box typically, so if there is a
variation between boxes, that I cannot detect, but within a box, it
seems that there is no use to test individual motors to select between
them; of course it is useful to kow the characteristics of the batch/box...
-Tapio-
- application/x-ygp-stripped attachment: stored
Received on Fri Mar 06 2009 - 06:30:35 CET