Many kit bodies to choose from. Just add your chassis and… drag race.
Last month we shared a conversation with you all regarding the certain evolution in the “next generation” of pancake armatures (rotors & plates) with winding guru Daniel Cardinale. Dan has developed a new generation of commutator plates. This technology dosn’t come without research and development. Looking at the past can assist with developing the future….so here is a summary of the analysis of the great ones (and not so great ones) from the past.
* LaGanke Silver Comm plate – this is actually a good quality nickel
plating over copper. Fairly common in the PCB world.
* Model Motoring Silver Comm plate – this is a poor quality nickel
plating over copper. Very porous.
* JL Silver Comm plate – this is a silver immersion coating over
copper. Typical on PCB’s. Used to prevent copper tarnishing
after soldering. Useless coating in our application.
* Original Aurora Silver Comm plate – this is the closest to real
over copper. Also why it wore off fast.
What’s next for 2010 and the future of pancake drag racing? Stay tuned for a full H.O.D.R.A. report.
Tom was a mentor in realistic vacuum forming. He taught me many intricacies of
the art form in my quest to obtain and provide greater detail from what some
otherwise would call “blobs”. Tom was a great modeler, mentor and friend. I lost
track of him about three years ago. I am very sorry to hear of his passing and
my condolences go out to his family and friends. A true gentleman competitor in
the hobby sport. He will be missed. (and so too his talent). Truly TOP s !
Without his guidance and influence, RJM Racing HO Customs – Flaming Shark Drag Bodies - would not have come into existence.
Word in the pits is that Daniel of DC HO Motors is developing new commutator plates for pancake motors with a much improved design . This new design and material is slated to put pancake motor drag racing in new league and a new set of record books. More will be posted as press is released. Is genuine metal in your drag racing future? I had the pleasure of “in person” chatting with Daniel in April of this year and have exchanged several emails regarding this topic…and product.
Here is our voluntary comittee staff. Enjoy !
With deepest regrets, the 2009 H.O.D.R.A. Grand National event is cancelled due to scheduled surgery on part of one of the organizers.
We apologize for any inconvenience this may cause.
NOVEMBER 7th, 2009 -cancelled event
Many enthusiasts are beginning to move away from batteries and chargers
to fully regulated power supplies.This glossary will assist you in understanding what it means and how it works.
the temperature of the still air surrounding a power supply, measured a minimum of 4 inches (10.2 cm) from the supply. Note that Martek Power Abbott power supplies are conduction-cooled and that temperature specifications refer to baseplate temperature, not ambient temperature.
the temperature at the hottest spot on the baseplate of the supply, usually at the center, but measurements of the hottest spots at the edges are valid approximations.
the condition created during peak usuage periods when electric utility companies intentionally reduce their line voltage by approximately 10 – 15% to counter excessive demand.
the component of noise in a power supply that is common to both the dc output and return lines with respect to the source power return point (input neutral).
in a multiple output power supply, the voltage change at one output caused by the load change on another, expressed as a percentage of the nominal voltage.
a type of overvoltage protection that rapidly places a low resistance shunt (typically an SCR) across the power supply output terminals when the output voltage exceeds a predetermined value.
[Click] on image to see a larger version.
reducing one operating parameter to compensate for changes in other parameters to maintain reliability. For example, the reduction in output power at elevated temperatures.
the component of noise in a power supply, excluding common-mode noise, that is measured between the dc output and output return.
the ratio of total output power to input power, expressed as a percentage. Efficiency must be specified at a specific combination of load and input voltage.
Electromagnetic interference (EMI)
unwanted high-frequency energy that is conducted through the input or output lines or radiated into space by switching power supplies. Also known as radio-frequency interference (RFI).
Foldback current limiting
a type of power supply overload protection that decreases the output current as the overload increases, until the current reaches a minimal value at short-circuit. Foldback current limiting minimizes internal power dissipation under overload.
a power supply switching circuit that transfers energy to the transformer secondary when the switching transistor is on. Forward converter circuits store minimal energy in the transformer.
a condition that causes unwanted feedback when two or more circuits share a common electrical return or ground lines.
the time during which a power supply’s output voltage remains within specified limits following the loss or removal of input power. Holdup time is normally measured at full load and nominal line conditions.
Input voltage range
the range of input voltage values for which a power supply or dc-ac converter operates within specified limits.
the peak instantaneous input current drawn by a power supply when it is initially turned on.
Inrush circuit limiting
a circuit that limits the inrush current when a power supply is turned on.
the dc resistance between two defined points at a specific voltage in a controlled environment (25°C temperature and less than 50% relative humidity).
a device that changes dc power at its input into ac power at its output. Also called a power converter.
the electrical separation between the input and output of a power supply due primarily to the power transformer. The isolation is a function of materials and spacings throughout the supply.
the maximum ac or dc voltage that may be continuously applied from input to output and/or chasis of a power supply.
the maximum change in output voltage, expressed as a percentage, that occurs as the input voltage varies over its specified limits, with load and temperature constant.
the change in output voltage, expressed as a percentage of nominal voltage, that occurs as the load changes from minimum to maximum, at constant line and constant temperature. Load change may be specified for other than no load to full load as, for example, 50% load to full load.
using the power supply output voltage terminals as the error-sensing points to provide feedback to a voltage regulator.
Mean time between failure (MTBF)
the failure rate of a power supply, expressed in hours, either predicted as prescribed by Military Standard MIL-HDBK-217 or measured as prescribed by Military Standard MIL-STD-781C.
Operating temperature range
the range of ambient or case temperatures through which a power supply may operate safely and perform within specified limits. For Abbott military power supplies, this range refers to baseplate temperature.
Output current limiting
a protective feature that keeps the output current of a power supply within predetermined limits during overload to prevent damage to the supply or the load. The supply automatically returns to normal operation following the removal of the overload.
a protective feature that limits the output current of a power supply under overload conditions so that it will not be damaged.
Overvoltage protection (OVP)
a protective feature that shuts down a power supply (reduces the output voltage to a minimal level) to prevent damage to the load when the output voltage exceeds a predetermined limit.
the connection of the outputs of two or more power supplies of the same output voltage to obtain a higher output current than either supply can provide alone. Parallel operation requires power supplies that are specifically designed to share the load.
Periodic and random deviation (PARD)
the unwanted periodic (ripple) or aperiodic (noise) deviation of the power supply output voltage from its nominal value. Ripple is a function of the input line and switching components. PARD is expressed in minivolts peak-to-peak or rms, at a specified bandwidth.
Pulse-width modulation (PWM)
a method of regulating the output voltage of a switching power supply by varying the width, but not the height, of a train of pulses that drives a power switch.
Rated output current
the maximum load current that a power supply is designed to provide at a specified ambient temperature.
the power supply circuit that controls or stabilizes the output voltage at a preset value.
a technique for regulating the output voltage of a power supply at the load by connecting the regulator error-sensing leads directly to the load. Remote sensing compensates for voltage drops in the load leads.
for an adjustabe supply, the smallest change in output voltage can be realized by an adjustment.
Reverse voltage protection
a feature that protects a power supply from damage caused by a voltage of reverse polarity applied at the input or output terminals.
Ripple and noise
(see Periodic and random deviation)
a popular method of linear regulation in which the control device is connected in series with the raw dc and the load to achieve constant voltage across the load.
a protective feature that limits the output current of a power supply to prevent damage to the supply caused by short circuits.
a feature that ensures the smooth, controlled rise of the output voltage. This feature protects the switching transistors from transients when the power supply is turned on.
the range of ambient temperatures through which an inoperative power supply can remain in storage without degrading is subsequent operation.
the rate at which the dc voltage is switched in a dc-dc converter or switching power supply.
a high-efficiency switching circuit that operates in a closed loop system to regulate the voltage across a load, generally by means of a pulse-width modulator.
the average change in output voltage per change in degree of a baseplate temperature, expressed as a percentage of nomimal output voltage, over a specified temperature range.
a protective feature that shuts down a power supply if its internal temperature exceeds a predetermined limit.
a characteristic of a multiple-output power supply that describes the changes in the voltage of one output with respect to changes in the voltage or load of another.
Transient recovery time
the time required for the output voltage of a power supply to settle within specified output accuracy limits following a step change in output load current or input voltage.
the time required after a power supply is initially turned on before it operates according to specified performance limits.