Tips From Our Techs: Battery C-Rating

With all the high-tech devices out there, we sometimes tend to over look the basics of the hobby. One common question we get is about the “C-Rating” on batteries and how to determine what you need.

C-rating is the number used to express the discharge and charge capability of a battery. Knowing how to calculate this becomes important when you are looking to outfit your model with the correct battery and space is a limiting factor.

To get the C-Rating appropriate for your aircraft use the following formula:

C-Rating needed = [Current Draw]/[Capacity (A)]

This will yield you the MINIMUM C-Rating that will work safely in your system. It is always a good idea to allow yourself a bit of overhead on your battery choice.

Lets break it down in the following examples.

Here is what you know: Your system will pull 90 amps, but you can only fit an 1800mAh 6S size battery pack. So your formula will look like this:

C-Rating needed = 90A/[1.8A]

C-Rating needed = 50C

*Take note that the capacity of your battery must be calculated in amps, not miliamps.

Here is another example where we are using a battery in series.

Here is what you know: You are flying a helicopter drawing 200 amps and using two 5000mAh 6S batteries.

C-Rating needed =200A/[5A]

C-Rating needed = 40C

Find your perfect battery below.

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Building Season is well on its way… But for those of you who aren’t necessarily builders, or just don’t want to fuss with it, we can help! Take advantage of our Store Display aircraft – all of which have been expertly built at our shop and are ready for your receiver ready. If you don’t see one that floats your boat (or lifts your plane ) contact our building department and see what we can do for you!

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Jeti Firmware Upgrade 4.22 Now Available

The newest update for the Jeti DC/DS 24, DC/DS 16, and DC/DS 14 Transmitters is here.

Read on to find out what has been added and what has been changed in the update.

New Features:
1. (DC-24 only): Model description (a “label” parameter) has been added to the Model – Basic Properties menu. The label is then shown while you browse the model list within the Model Selection menu. The label has an informative meaning and should be used to distinguish between similar models.

2. Lua is now available for DC/DS-14, DC/DS-16 and DC-24.
3. New functions and possibilities have been added to the Lua programming API.
4. Several function and new options have been added to provide seamless compatibility between DC/DS-16 and 24.
5. Any Lua telemetry screen can be assigned to the top status bar (instead of default clock). See the Timers/Sensors – Main Screen menu.

Dual Rates/Exponential Smooth Transition
Added option for proportional and smooth Dual Rate/Exponential transition. See the Fine Tuning – Dual Rate/Exponential menu and check the “Prop.” option. If you assign any proportional control as a DR switch, you will be able to set the DR/Expo values more precisely.

Jeti DS/DC-16 Jeti DS/DC-16 Jeti DS/DC-16

New Option for Smooth Curves
Added option for smoothed function curves (see Fine Tuning -Function Curves, Fine Tuning -Free Mixes, Fine Tuning -Butterfly).

Jeti DS/DC-16 Jeti DS/DC-16 Jeti DS/DC-16

New Digital Trim Functionality
The digital trims (Fine Tuning -Digital Trims) can now work in two additional independent modes:
3-Position Momentary Switch Emulation: The up/down positions are active only as long as you hold the corresponding trim button. Default value is otherwise 0%.

Rotary Functionality: Every time you press the trim button the value is increased or decreased according to trim step. This creates an arbitrary number of predefined positions of the trim control which is useful for example for switching flight modes of stabilization systems. Default value is -100%.

1. Fixed heli and airplane gyro settings (Fine Tuning – Gyro Settings and Governor menus, a problem had appeared in V4.20 and was immediately solved by version 4.20.1).
2. Fixed Throttle Limiter function behavior if an expo value is non-zero.
3. Date in the Model Selection dialogue is now displayed correctly.
4. Sensor selection dialogues now contain sensor name together with parameter name, e. g. “MUI: Current[A]”.
5. Frequency response of the vario sound has been modified to better match high performance variometers.
6. Corrected behavior of telemetry alarms if a “silent” sound profile is selected.
7. Lua: Function system.get Inputs (“P3″,”P4”) now returns correct values for both stick controls.
8. Lua: Function system.vibration() now behaves correctly and according to specification.
9. Lua: The top status bar now displays an informative text if Lua environment is not running (“lua: x”). Lua can be stopped for example in the Model Selection menu, Device Explorer menu or while you are creating new model.
10. Lua for DC/DS-16 and DC/DS-14: Optimizations in the Lua core have been applied so that it now consumes less memory.
11. Lua for DC/DS-16 and DC/DS-14: A hard-limit has been set to limit the memory consumption of the applications. If the Lua environment exceeds 50kB, all scripts are killed.

For more information on updates check out the link below.

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Pulsar 4E Pro Compact Is Here

New Pulsar 4E Pro Compact Electric Sailplane just arrived (Full/REF/RES)!

The Pulsar 4E Pro Compact is the latest and largest addition to the ever-growing Pulsar family of hand-made electric sailplanes. Built at our request, the new line of Pulsar Compact Models have been designed for ease of transportation. New 4-piece wing with CF wing rod and 2-piece fuselage keeps all parts under 1m. Price ranges from $1195.00 to $1225.00