Ultimate-Jets

ASSI module for Jeti


Multi remote standards telemetry, JetCat/ Xycoy/ Jrojet ECU interface, IAS and AoA indicator/warning, autothrottle and datalogger.

 

 

 

 

 

 

 

 

 

 

 

 

The Jeti ASSI device is a versatile unit with a number of subsystems. It features many useful functions specifically dedicated to jet modelers.

It was designed by Carsten and is produced in-house by Ultimate Jets. Development is made in cooperation between Carsten and Oli.

 

Compatibility with radio systems:

All Jeti Ex transmitters.

 

Here is what this wonderful unit can do for you.

1. It measures the following:

IAS, Angle of Attack (AoA) (optional), actual G forces, GPS data ( optional, via our CAN-GPS board), radio altimeter, pitch, roll, yaw data ( optional via our CAN-RA-IRS ), temperatures from -200 to 1300 c ( optional, via CAN-TEMP board ).

2. It collects valuable data from your JetCat, Xycoy  or Hornet controlled engine(s), monitors receiver signal quality and the number of failsafe frames.

3. It can control the throttle (auto throttle) of your engine(s), maintain programmed IAS for 5 flap positions and issue warning signals using ultra-bright LEDs if the IAS is above/below the programmed speed.

4. Using a communication bus (CAN Bus) the device will also show engine data on a cockpit mounted LCD screens (optional) in the plane through our CAN-LCD screen.

The data can also be used by another slave unit in a multi engine setup.

5. All of the parameters sampled will be logged into a SD card mounted in the device. The Master device will log a complete set of data whereas the slave devices will only log the ECU data.

6. It will return up to 12 telemetry values to your transmitter ( EX telemetry ). This data can be displayed on any modern Jeti transmitter transmitter. Data can be configured through the device explorer on board the transmitter.

 

 

Here is the simplified schematic of the ASSI inputs and outputs.

 

 

 

 

The slave devices only collect data from the connected ECU and controls the throttle

channel to it. The throttle setting is provided by the master device. The slave device can

also only output 4 telemetry values (ECU data).

 

 

 

The ASSI programming is done through a simple log file that can be edited from a PC and that must be loaded on the device SD card.

 

 

 

The ASSI device can be configured as master or slave for respectively single or multi engine configuration 

Here is a detailed description of the telemetry capability of the device:

 

ASSI subsystems

  • Indicated IAS (maximum is 460 km/h, accuracy is +/- 5%)
  • Angle of Attack from -20 to +20 deg, with 1 deg resolution
  • Auto-throttle function (minimum IAS for up to 5 flap position ( configured during the flight by the pilot)
  • Configurable IAS (set a target IAS on your transmitter with a dial, and the plane will maintain the speed set)
  • Warning for IAS (or optionally AoA) with red and green ultra-bright LED's

 

"ECU" (data from JetCat ECU):

  • Fuel remaining in the tank
  • Current EGT
  • Current RPM
  • Current ECU battery voltage
  • Pump voltage

"ECU" (data from Xycoy ECU):

  • Current EGT
  • Current RPM
  • Current ECU battery voltage

 

"ECU" (data from Hornet ECU):

  • Fuel remaining in the tank
  • Current EGT
  • Current RPM
  • Current ECU battery voltage
  • Pump voltage

Jeti telemetry

  • ECU: Fuel remaining (in milliliters)
  • ECU: Current engine RPM
  • ECU: EGT (in deg Celsius)
  • ECU: battery voltage (in 0.1V)
  • ECU: Pump voltage
  • ECU: Engine State
  • ASSI: IAS (in km/h)
  • ASSI: AoA (in degrees)
  • ASSI: Maximum IAS during current flight (in km/h)
  • ASSI: Current mode for ASSI system (0=disable, 1=normal, 2=auto throttle)
  • ASSI: Preset IAS (set by dial on transmitter, 0..250 km/h)
  • ASSI: G force (0.1G)
  • RX: Failsafe counts
  • RX: RSSI (0-3, The quality with which the receiver sees the transmitted RF data. 0=poor, 3=best)

Transmitter compatibility:

  • All Jeti Ex series tranmitters

 

"AUX COM" (Auxiliary communication to other devices):

CAN bus for connection to slave devices (in multi engine setups) and to cockpit mounted

graphic LCD color display(s)

 

"DATALOG" (SD card data logging):

A data logger that stores all data (including servo positions, ECU data, IAS/AoA, failsafe counts ) . These logs can be converted at a later stage into a KML format where you'll see the actual flight path in Google Earth together with all the parameters logged each second.

 

 

ASSI connections on a single engine setup:

 

 

ASSI connections on a dual engine setup:

 

 

The dual engine setup will enable the pilot to see both engines parameters as well as fuel quantity.

Audio alerts can be configured for an engine failure condition by monitoring ECU RPM ( spool-down/ Thrust-down detection ) or Pump Voltage ( immediate detection ).

 

Here is a video demonstration of the system capability on a DC-24:

  

Hardware characteristics:

 

L: 64 mm

W: 37 mm

H: 14 mm

Weight: 15 grs

Consumption: 25 to 125 mAh

Sold as a nude board without pitot tube or AOA sensor.

Welcome to Ultimate Jets.

We are the one and only USA based turbine powered UAV and hobby models manufacturer. Ultimate jets offers some of the best engines, kits, and accessories to the Industry. ................................................... We offer in-house design and manufacture services for military and hobby companies. Our expertise extends from aero dynamics design to carbon fiber aerostructures manufacture and 5 axis CNC milling and turning. ................................................... We are the USA distributors for Behotec, BF-Turbines, Mibo and Aviation Design and provide in-house support and service for these products. ................................................... We also are dealers for the following brands: Jets-Munt, Permagrit, Ultratool, Cotronics, Techflex and many other aerospace industry suppliers. ................................................... We finally house a unique technical blog that you will find below, providing industry reference articles. Please feel free to browse through these pages. Enjoy... Barry, Woody, Shaun and Oli.