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Iafret’s Solution to
Unplugging
Dean’s Ultra
Connectors
I will let the photos
do most of the talking because it is so simple;
First, run out to your
local auto parts store and buy an E-Ring tool. I got this one at
Auto Zone for about $10.00 and it comes with three heads to
allow you to get into difficult places if the connector is in
the plane.
The only mod needed to
the connector is to drill a #50 hole in both sides of the
connector system but be careful to drill so you miss both metal
blades. I find if I nestle the drill into the radius at the
surface level change it works very well.
Here are the photos to
help you along.
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This is the tool used to separate the connectors with
very little effort and a lot of control.
It has really helped
to not be pulling on the wires and when the connector lets go,
your had smashes a wing or some other vital part of your pride
and joy. |
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Should be self explanatory, just drill a hole in each side
for the tool to register with. |
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Looks and is easy |
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Dave Corven's
Solution to Holding
Setup Templates Upright |
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Although these templates are for a Supra and available through
Jack Iafret, you can build your own for any four servo wing.
They are very handy to get both sides of the wing the same for
all settings. I usually use a surface plate and a height gage
for initial setups, but this is much faster and probably of
equal accuracy. |
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Here are the templates with their braces setting on a wing (not
a Supra of course) to give you the idea of how they would be
positioned on a compatible wing. |
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Testing A123 Cells
Using the Medusa Research Analyzer Pro |
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This is an overall shot of the test stand with the Thrust
gage, Analyzer (Little blue box), motor and battery (the yellow
stick behind the box and it contains 3X2200 mah A123 cells in
series) |
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Here is a close-up of the Power system, in this case it is a
Hacker B50 Carbon and 75 Amp Hacker/Jeti controller. The prop is
a 18X10 CAM that I have used for a couple of years on this
motor. The system is capable of over 100 amps for a short
burst (<20-30 seconds) but I normally run it around 70 amps to
keep the controller alive. In 10 cell (NiMh) contests the unit
will sink around 95 amps. |
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This is the output of the test rig displayed on my ancient
laptop. What you are looking for is the voltage curve that goes
from the upper left of the screen to the lower right. Notice how
when the system reaches full throttle and holds for 5 seconds at
the end of the curve, it continues to loose voltage. This is
taking place while pulling about 65 amps (ave). This is not
like the NiMh I have used in the past as the same tests show
that the voltage stays constant once max power is reached. In
other words the curve stays flat for at least the time I tested
it.
Not sure what will happen if I hold full throttle for 30
seconds and I do plan on doing that some day when I get time and
can do it out of doors. Running this thing in the basement is
kind of scary so I only hold full throttle long enough to get a
trend curve.
A 2S2P pack of the same cells run at 90 amps with a different
motor/prop/controller showed exactly the same characteristics
but in that case each cell would be under only 45 amp load due
to the parallel circuit.
What does this mean, not too much if the cells are doing
well in your application but if you are looking for a very
high current for a long period, these cells may not be the best
choice unless you parallel enough of them to keep the current
down per cell. I will still run them in competition at the NATS
this year because of the pluses that they give. Very fast
charge rate and low danger of flaming out on you. Also I do
not plan on running them much more than 20 seconds under full
load and they seem to do fairly well in flight tests, the sag is
noticeable but it is at the end of the climb so not too harmful.
More testing some day. |
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To my club members, if you want to do some testing using this
setup, let me know what you are trying to validate and maybe we
can add some more information to our knowledge base. |
