Copyright © 2016 Grand Rapids Technologies, Inc.
Electronic Flight Instrumentation for Experimental Aircraft Since 1991
Aircraft mounted Heads-
A heads up display can now be part your your GRT Avionics equipped airplane for as little as $300. Our pursuit of heads up display technology has led to support for the Hudly (gethudly.com) automotive after-
Actual view of HUD in flight over Michigan on a sunny summer day. Note the brightness of the screen and the clarity of the combiner glass. The edge of the combiner glass can be seen as a horizontal band in the bottom quarter of the screen. This photo is is directly from the camera, un-
Simple Installation -
Installation is a matter of mounting the projector and the combiner glass with double-
The HUD mounted in an RV-
Flying a precise approach into a short field previously required careful judgement of your approach path, accurately controlling speed, while maintaining visual separation from obstacles and terrain. This forced the pilot to alternate between views inside and outside the airplane. Even with our famous synthetic approach guidance, precision approach path information was only a heads-
With the HUD, flying a precise approach becomes easy. Activate the synthetic approach on the EFIS, and the HUD provides flight director guidance (just put the little circle in the flight path marker). IFR? It works the same, with the raw ILS/GPS LPV data provided on scales while the flight director guides you in.
Available Now! Here is how to order:
How to buy...
1. Purchase a Hudly from gethudly.com
2. Install GRT Remote App on your MHL compatible android device. Don’t have one? We recommend a Samsung S3, available on Ebay.com for well under $100.
3. The GRT HUD compatibility option is free with any GRT EFIS purchased during AirVenture. A five-
Try one today! Five hour free HUD trial is provided for any compatible GRT EFIS. See gethudly.com for details of 30-
Purchase any GRT EFIS and the GRT Vision/HUD Compatibility is included.
GRT REMOTE w/ HUD App Download
Your Android device must have "Unknown Sources" enabled in the
Security settings in order to install apps from web sites.
Access this web page with your tablet or smartphone and download App
directly to it by clicking this DOWNLOAD button. When the android completes the download, click on the download and the android will install the app. (This link to be active later today.)
Candid Questions and Answers with Greg Toman, regarding the new Heads-
Q. How is it in sunlight? With sunglasses?
Ans. Effortless to read in bright light. In fact, superior to any heads down display. When flying into the sun, the instrument panel is darker than the bright sky, and much closer than the HUD image, making for a more difficult adjustment for your eyes. Looking into the cockpit when on approach feel cumbersome by comparison. I much prefer the HUD data when landing into the sun. The brightness of the HUD adjusts automatically according to the ambient light so it is not overwhelming in other conditions..
Sunglasses have no effect on the readability.
Q. Where does the image appear to be focused?
Ans. Ideally, the image would be focused near infinity, but it is not. It might be something like 6 or 8 feet out, so you will have to change your focus to see either the HUD or the approaching runway, and you can not see both at the same time. Not ideal, and this was as I anticipated. However, I did not anticipate that this imperfection would turn out be of small significance with respect to the ability to use the data. The bigger effect, although also small, was to slightly confuse the view when looking through the HUD into the distance. You can simulate this effect by looking at a distant object and holding with you finger in front of you.
Q. What is the other imperfection?
Ans. The combiner glass vibrates at some engine RPMs. It was held in place only by a small piece of double-
Q. Do you really need a HUD in a VFR airplane?
Ans. No, but for $300, why wouldn’t you? I found it much easier to monitor my airspeed on approach, and keep that, and my glide path, precisely controlled. My second landing with it was into an 1850’ runway with the company RV-
There is no doubt it will benefit safety also. For example, as you approach stall, a red pitch limit indicator moves down from the top of the screen, and shows you that you are approaching stall. In fact, you can see how many degrees of AOA you are from stalling. Also, with the HUD displaying the synthetic approach glideslope, it is difficult to shallow up the approach without being aware of it. I see many pilots shallow their approach near the runway, probably because it makes the flare easier, but risks colliding with obstacles. There were two fatal accidents caused by this near Grand Rapids in recent years. The HUD allows you to monitor your approach more precisely and easily.
Q. Will the HUD work in IFR?
Ans. Yes. Lateral and vertical deviations are displayed on it when they are active, from the synthetic approach, ILS, or GPS approach, in addition to primary flight data.
Q. How long does it take to adapt to it?
Ans. For me, practically zero time. I was skeptical of this before the first flight, but on the takeoff roll I found myself using the airspeed, and climbing out with my head out the window. I did not look into the cockpit for primary flight data the entire flight.
Q. Is the combiner glass hard to see through?
No. It is glass (not plastic), and has optical coatings. Very well done. Optically beautiful. I suspect it has anti-
Q. If I make my own mount for the combiner glass, should it allow the combiner glass to be swung out of the way?
Maybe. My second landing with the HUD was at an 1800’ runway (61D – runway 27), and into the sun, no wind, in an RV-
Q. How was it at night?
Ans. I did not fly or land at night with it yet. I did land about 20 minutes after sunset, and it was fine. The brightness adjusts automatically, and it seemed ideal.
Q. The projector looks a bit bulky and seems it could block a significant amount of
your forward view, especially in the RV-
Ans. I had many concerns before I flew it, and this was one of them. As it turned out, it blocks very little area (maybe because we have two eyes spaced apart more than the width of the projector?) and was absolutely a non-
Q. What about reflections off the combiner glass, especially when the sun is behind you?
Ans. This was another on my list of concerns, and it also was a non-
Q. Is the HUD useful in cruise?
Ans. Absolutely. It makes everything easier. In fact, it could make things too easy!
Q. Does the HUD symbology, such as the horizon line, match up with the real world?
Ans. Not exactly. Because the field of view of the HUD is small (about 5-
Q. Would a larger HUD be preferred?
Ans. This was another concern I had that proved to be unfounded. Yes, the field of view of the hudly is a small part of the world around you, but it seemed to be the ideal size. If the HUD was optically perfect (like that in a military airplane) I might prefer it to be larger. Since it isn’t optically perfect, having a view around it was nice. For example, in the flare, I found that I was looking under the combiner glass to sense the ground at touchdown. The Hudly is certainly large enough to show a great deal of information, and is easily readable. I am quite content with it size.
Q. Will the HUD work with my prescription glasses?
Ans. Yes. I am slightly near-
Q. How does the Hudly compare with the Android glasses?
Ans. The android glasses (Epson BT-
For me, the HUD was a dramatic improvement in convenience, and I also like the image being “attached” to the airplane, as compared to my head. The resolution is more than adequate. I suspect that 95% of users will find this to be true, and a small percentage will still prefer the glasses. For me, it is a no-
Q. How do I use the HUD in my certified airplane?
Ans. It must be used with the Mini-
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