Backup Airspeed Indicator

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ASI2My Engine and Flight System manager is designed to take four analog sensors on the main module. I have added a low range differential pressure transmitter to channel 1. This transmitter is calibrated for 0 to 25″ water which equals 0 to 195 knots/hour. The speed in MPH is calculated in the manager as MPH=SQR (“H2OX1980). I tied the high pressure port of the transmitter to the pitot line from the pitot port on the wing and the low pressure port of the transmitter is connected to the stock RV9A static ports on the aft sides of the fuselage. I’ll use a manometer to check the accuracy of the Dynon and this transmitter with the Engine and Flight manager this week. ASI3The bottom picture shows the tranmitter in relationship to the auto pilot servo motor.

Update March 10:

I didn’t get to using a manometer to verify the accuracy of the the two airspeed indicators (Dynon and my flight system manager) but I did apply a low pressure to the pitot line and then valved it in. Both indicators read within 2 to 4 knots of each other at a variety of different pressures (speeds). Left blocked in, the readings stayed solid for a few hours, indicating no fitting leaks.

The Engine and Flight Systems Manager Intro

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What started out as a small 4″ monocolor display has grown into a high resolution color touch screen display with super bright graphics. It has a brightness rating of 1000 nits which is slightly lower than the 10 inch Dynon Skyview it will be sitting beside in my panel. I have custom built all the displays and logic programs that provide a list of features I’ll try and explain in upcoming posts. The main drive for building this display was to set up a better interface to the Precision Eagle ECU than what was delivered in the box. If you have an Eagle, you know what I mean. This system communicates with both the left and right ECU via a communications driver I configured. This system also receives Skyview Engine Monitor data via a serial data link. Updates are every second. Final interface is with a Garmin GPS module for back up position data and some basic navigation features with a destinations data base. There are many more features built in that I will expand on as web time allows. This is not a commercial venture, just something I crafted for my project and I will share with others who have similar needs.MAIN_SCREEN