Protech ZOOM 425 ccpm Specifications Page 66

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the headspeed.
There are other tachometers, including:
Magnum mini-tach. Price is about $35.
Hangar 9 micro digital tach
Thunder Tiger 2642 mini tachometer
Tachometer
For some reason, Quantum Models www.quantummodels.com stocks more tachometers than
any other online store I've seen.
The shadow of the rotor blade should fall on the tachometer sensor for best results. Therefore,
the tachometer should be under the rotating plane of blades.
It is a good idea to build a stand for the tachometer or to tie it to a tent stake so you can stand
a safe distance away from the rotor blades and read the tachometer display.
Tachometers will not work indoors with fluorescent lighting, because fluorescent lights flicker at
50 or 60 Hz which interferes with detecting the main rotor blade shadow. You must use either
incandescent lighting or natural sunlight.
7.3. Adhesives
7.3.1. CA Glue
CA glue is Cyanoacrylyte glue, which is a type of instant glue. There are usually three different
types of CA glue: thin, medium, and thick viscosity.
CA glue works best when fresh, and gradually loses its adhesive properties as it ages. It is
best to either discard old CA after a few months or store it in refrigeration to preserve its ad-
hesive properties.
7.3.2. CA accelerator
CA accelerator will instantly harden CA glue, and is recommended when extremely strong
structural repairs are required.
Support Equipment
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