The Best Altimeter for General Aviation, ever!!

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Every once in a while, I've had the opportunity to work on something that has turned out to be an industry game changer.  Giving a nod to my background in computer forensics, one recent game changer that I've been privileged to be a part of is the CRU / WiebeTech "Ditto" product, which sucks information from hard drives in a forensically sound manner.  In fact, it can do it from halfway around the planet.  It does other really cool stuff too, like support stealth mode, but I won't talk about that here.  :-O

My 30 year background in electronics, combined with my aviation passion, has allowed me to create a product which is simple to understand, and is very useful in multiple ways, and is affordable, and will be used by the owner, providing years of "why didn't someone do this before" moments as it provides valuable flight information.

It does many really cool things:

For instance, it displays Standard Indicated Altitude, which is received from a temperature compensated solid state pressure sensor circuit built inside the unit.  This is the altimeter function you've come to know and expect.  It works from 0 to 20K feet, no issues.  You set the local altimeter pressure, it gives you the altitude.

The screen looks like this:

Indicated Altitude on Altimeter from Belite Aircraft

There are two indicator lights on the left (only one is used in this model).  There are three switches in the unit.  In order to set the local pressure just touch the left or the right switch.  The pressure setting will move up and down.

If you touch the center switch, the unit will skip forward to the next mode, which is one of its coolest features:

*  DENSITY altitude.  The unit will supply the calculated density altitude, based on cockpit temperature.  This feature is alone worth its weight in gold.  I no longer guess or calculate the DA, I just touch a button and it reports it to me.  You don't have to input the local pressure setting for this to work correctly; in fact the local pressure setting is irrelevant to the Density Altitude calculation.  Density altitude looks like this:

Density Altitude calculation on Belite digital altimeter.

Density altitude, by convention, is always shown rounded to the nearest 100 feet.

By clicking the mode switch again (and again), you can move through several more display modes.  They include:

Current system voltage
Current absolute pressure in inches or in Pascals
Current system voltage alarm level
Current display system -- English or Metric
Temperature, in Fahrenheit or Celsius
VFR Cruising alarm enable

Displaying the current system voltage is straightforward.  I've got a screen shot showing an example:

Display the voltage

The unit shown was attached a nine volt battery.  It will work fine with anything between 8 and 14 volts, so attaching to any conventional 12/14v system is fine.

One of the screens lets you select a system voltage alarm level:

Display the voltage alarm

So for my 9 volt battery, I set this to 8.6 volts.  For a 12 volt system, I would probably set it to about 12.5 volts -- it would never go off unless the alternator failed.  It flashes a battery symbol in the lower left corner of the display when the voltage is low.

I like the temperature display, because I think the design of the display icon is kind of cute.  Here it is:

Belite digital altimeter showing temperature in fahrenheit.

As mentioned, there are several other screens which the unit will display.  While stepping through the screens, you can always switch back to indicated altitude by holding the center mode switch down for about 2 seconds.

And if you hold the same button down for about six seconds, the unit will turn off.  Touching any button brings it back to life.

While on the home (indicated altitude screen) if you push the mode button down, it will turn on a soft internal backlight.  The backlight may also be attached to an external dimmer, compatible with 0 to 12 volts.

Another really interesting function for the average General Aviation pilot is the VFR cruising alarm.  This alarm, when enabled, will flash the LED with a bright Red blink pattern when your altitude varies more than 100 feet from a VFR cruising altitude.  For instance, if you are flying at 5500 feet, and the alarm is enabled, and you stray downwards to 5399 feet, the alarm will alert you.

The unit is so sensitive and accurate, you may place it at your feet and read the altitude, then move it to over your head, and read the change in altitude.  There is a little single digit inaccuracy, but you will note a change in between 6 and 10 feet.  Also, the unit is very fast -- it updates information many times per second.

Here's some basic technical information.

1.  This unit weighs 50 grams, about 1.5 ounces.

2.  This unit consumes about 1 milliamp of power.  That is one-thousandth of an amp.  (Assuming the backlight is NOT turned on.)

3.  The external dimmer line is compatible with any voltage from 0 to 12V.  Must supply up to 40ma of power for the backlight.

4.  The unit will fit in any standard round 2.25" instrument hole.

5.  You may remove the metal faceplate and directly mount the unit in any flat panel (must drill appropriate holes and cutouts to accommodate.)

6.  Power supply must be between 8 and 14 volts.

7.  Indicated altitude is shown in increments of one foot.  Internal Analog to Digital converter has less resolution but is "dithered" to increase resolution.

8.  The unit is upgradeable via firmware downloads.

9.  It will display any altitude between 0 and 20,000 feet.

10.  The VFR cruising alarm margin is +/- 100 feet.

11.  As the unit is 'experimental', it may be used in any experimental airplane or ultralight airplane.  With manufacture support, it could be used in Light Sport Aircraft.

12.  When purchased in our enclosure version, it may be used in any aircraft.

You can order it from our online store, or from Aircraft Spruce, or from any of our international distributor partners.  Pricing is $249.95 (US), or $299.95 in an enclosure with battery.

Absolute Pressure in Pascals.

In summary, my competitive sales guide would read like this:

1)  Lightest industry weight -- 50 grams
2)  Smallest size -- very thin, fits standard panel 2.25" hole
3)  Lowest power consumption -- 1 milliamp
4)  Highest resolution -- 1 foot displayed
5)  Useful range -- 0 to 20,000 feet
6)  Safety paramount -- provides Density Altitude
7)  Cool additional features:  -- voltage alarm, VFR cruising alarm, more
8)  Great value -- $249.95
9)  Also available in an enclosure for use in any airplane

An independent comment on our plane & instruments

From Terry Alley:

I went to BeLite's shop last friday to visit with James Wiebe about changing the engine in my Kit Fox Lite to the Hirth F23 like the one he has in his new Superlite. While discussing the performance of his plane, James had a slip of the tongue and said "you ought to fly that and see what it feels like", I thought he would never ask.

After sliding into the cockpit I took a little time to familiarize myself with his new LED Panel. At first I thought it would be a little confusing trying to read all the lights but once I became familiar with their location, they were quite easy to read and seemed very accurate. I especially liked the Inclinometer and the Turn Rate indicator. Those two may have to find a way into my panel. The altimeter is zero'd before taking off and is only a AGL instrument, but what else would you want in a ultralight. I made several turns into and away from the sun and the LED's stayed visible reguardless of direction and lighting.

Now for my comparison between the original Kit Fox Lite which I have the new BeLite Superlite.

Cosmetically they look the same with the exception of mine having a full covered fuse. The interior, again no changes, other than the panel already mentioned. The only noticable difference in feel was the rudder. Belite has improved their design to use push/pull cables to the rudder. While they make the rudder feel a little stiff, the contol was very positive. Everything else felt the same excpet the power.

My Lite has a 37 hp 1/2 VW which I really love except for takeoff performance. On a hot day it will make you pucker up if you have to climb over some trees on takeoff. But the cruise is a nice 65 once you get there. The Belite had the new Hirth F23 opposed twin 50 hp. When I lined up on the runway and added power before I could look down to see what the RPM was, I was airborne. Not only airborn but I continued to climb at 50 mph and at a pretty steep angle of attack. Needless to say I was impressed.

After making some steep turns and doing a couple of stalls I concluded this new bird has the same great flying characteristics as the original Kit Fox Lite (when I say original that is what I mean as mine is serial #001). I decided to test the new spring shocks that James had just added to the gear that day. This a great replacement for the bungees (which I have had one failure on). I came in across the fence at 50 and let the speed bleed off until a did a nice wheel landing at about 35 to 40 mph. At that point, I added power without letting the tail come down and almost instantly I was off the ground again. The next approach I added one notch flaps and crossed the fence a little less than 50 but holding a little more rpm. The speed bled off and I held it off until the airspeed dropped to just below 35 and it settled on all three wheels for a short rollout. The new spring shocks worked great in softening the touchdown with no bounce at all. I thought it was my landing skill but James assured me it was the new gear.

Conclusion: The Superlite is a great little airplane especially with the F-23 in the nose. If you are looking for a safe reliable plane that is a blast to fly, give James a call. And for all the Kit Fox Lite flyers out there, be thankful James picked this plane up and put it back in production. Any part you might need for your plane just became available plus many upgrades.

Terry Alley
Kit Fox Lite
N3169

Sharpness

Chapter One: Clouds

The recent rains and intermittent sunshine have caused the countryside around Wichita to explode with green. Planted fields are already substantially sprouted. Trees have all their leaves. Plowed fields provide a dark, wet contrast.

I am looking it all over; I am sitting in my airplane, looking out. To the north, I am struck by the dark charcoal clouds. They are hanging over the fields -- providing even more enunciation of color, dampness, wetness, nature. 500 feet off the ground; perhaps a little more. Occasionally my altitude wanders lower.

The clouds are like slashes of charcoal across a matte paper.

It has rained heavily. A creek is roaring between its banks -- all waters are thick brown. A bit of foam dances up to one bank, but somehow is repelled away. The vision recedes behind me.

I cross the Kansas turnpike. I see a plaza between the lanes. Cars can pull in; get gas; eat at the McDonalds, and go on their way. I wonder who is looking up from the cars, and what they think of my airplane. I'm sure almost all are puzzled: my airplane looks like a dragon.

A few days ago, a trio of deer had run across a field while I circled my dragon above them. Did they see me? I saw them.

I am, in some oblique sense of the word, wasting time.

I find myself once again flying over my friend Terry's home. I don't see his truck; I do see his airstrip. The airstrip is oddly hidden, because of the depth of the grass. (Terry, it needs to be mowed.)

Glancing at the gas gauge, I see 60% fuel remaining. Lots of time to continue to waste.

I can feel a bit of vibration coming up through the heels of my shoes. I've not noticed it before. Like many other pilots who've mused over an odd vibration or sound, I start to think about what could be wrong.

Nothing. Nothing is wrong.

Looking south, I can see 30 or 40 miles to the horizon.

Looking to the north again, the sky is a little hazier. The north horizon is not nearly as sharp as the south. There is more humidity in the air.

An odd thing happens: it starts to rain. Just lightly; but enough to patter the windshield. The doors are not installed on this airplane, and even so, I remain dry.

I have my leather coat on. I'm also wearing a stocking cap, noise cancelling headphones, and light gloves. It's a perfect combination. I can feel the wind beating on the sleeves of the coat as they rest on the sides of the fuselage. My torso and head stay in calm air.

Now I'm even more relaxed: I've pulled my feet off the rudder pedals. The airplane now moves wherever I want it to using just the control stick.

Above the clouds, the sun is shining. Below the clouds, there is ample evidence of the sun and its working: green-ness; creeks; fields; rain; cool flyable air; much more.


Chapter Two: Technicalities

The Belite uses a 5 gallon tank. The purposes of my flight today was to verify instrument functionality and to also nail down fuel consumption. We I flew the plane for exactly one hour and then measured the reserve. I had 1.6 gallons of fuel remaining.

This means that the Superlite fuel consumption with a Hirth 50HP F23 engine @ 5800RPM is about 3.4 gallons per hour. This allows 1 hour and 25 minutes from full to dry tank. Based on a cruising speed of about 60 mph, this gives a reachable radius of about 75 miles in calm winds. I may be able to improve this a little; I've ordered a cruise prop to go with my engine.


Chapter Three: Crosswinds

Our airstrip is 2600 feet long and about 75 feet wide. Beyond each side is an ample unmowed area.

A few days ago, we had a very blustery crosswind.

I looked at the runway a little differently. I walked across it, and picked up some grass. Tossing it up, and looking diagonally backwards, I saw a new runway, constructed by landing on the existing runway diagonally.

"I know what you are doing," said Doug, who runs his small business out of a hangar close to mine and had walked up behind me.

Doug practices whenever possible in one of his helicopters (he's a dealer). He understands the importance of practice, and he saw that I was trying to increase my practice time by overcoming the crosswind blues.

Comfortable with my new 'make-do' runway selection, I took off into the sharp crosswind. I started making circuits around the pattern and the field, re-creating the new pattern.

My new pattern works beautifully. I land without event, diagonally across the existing runway. I take off again. I land in some slightly taller grass. The feeling of moving through the grass on touchdown is ... I struggle for the right word. Great?! Wonderful!? Smooth?? These are not the right words.

There is no adequate word. Landing in the taller grass makes me feel like an adventurer. I don't know how to put that into one word.

This reminds me of when I landed in the flint hills, nearly a year ago. I remember the flow of the grass in the wind, and the feeling of gentleness, as my airplane settled into the thick grass on touchdown.

I take off and land again. Each landing builds confidence.


Chapter 4: El Dorado

The lineman at the El Dorado airport can't believe his eyes: He's never seen a plane as small as mine. We full my gas tank up with 100LL. Total bill, about $8.

Smallest plane he's ever seen; smallest gas sale ever as well.


Chapter 5: Instruments

I occasionally glance at the instruments on the panel. I like what I see! The clouds have completely blocked the sun; I flip the switch over to the 'dim' setting. The LEDs in the panel have a soft glow.

I roll the plane into a turn to the left; the turn gyro shows the turn. I note that my trim tab on the rudder is not quite set correctly: the slip indicator shows a constant 'one dot' slip to the left. I see that I have 30% of my gas remaining: perhaps it's time to land. I've throttled back and the airspeed is showing 55. All is well.

These instruments provide a sharpness about the condition of the airplane: I know my range; I know my speed; I know if I'm straight and level; I know how I'm doing. I like what I see.

I look back at the ground. There is so much green, and so much sharp definition between fields, prairies, creeks, horizon, and clouds.

I can't wait to fly again.

Pics of new avionics while in flight

This will be a short post. I went flying tonight for about an hour in the Belite Superlite Dragon. I wandered near Augusta to try and find Terry's strip -- sorry Terry! Didn't bring a GPS and couldn't find it. Turned around and headed back home.

I took some photos of my new panel while in flight. You can see that the inclinometer (ball) is centered, I've got gas in the tank, the volts are about right, my turns aren't too fast, and I'm about 800 feet off the grand.

I'm having a little trouble with the CHT/EGT gauge -- hopefully I'll have that squared away in the next couple of days.

Did anyone see the dragon fly overhead?

Featherweight Avionics

Gene and I have made several panels for a variety of our aircraft. They were a mixture of basic instruments: airspeed indicators, altimeter, engine gauges, inclinometers. Basic stuff.

I'd run into a few problems with instruments breaking; also a few problems with inaccuracies. I was tired of weight. I started to think about ways to improve that panel. My 30 years of experience in electronics kept nagging me: I just had to develop some good, inexpensive, state of the art instruments.

A lot of very good companies produce fantastic, expensive stuff. Almost all of the direction of the industry has been towards more integration and more expense.

Why not break that trend?

Why not design basic electronic instruments that replace old fashioned steam stuff, that cost less, that works better, that weigh about a dozen grams, not a dozen ounces or even one or two pounds, and that more quickly alerts (using bright LEDS) to marginal conditions such as low fuel or redline speed? How about instruments with no dials to twist?

Well, that's what I did.

We introduced 10 new instruments to the market. I won't pick at the details of each here (see our avionics page for details). I'll just mention the key points of one of them.



Let's talk about our Turn Rate Indicator:

1) It truly has a solid state gyro in it, and it's incredibly sensitive.

2) It's designed to show a standard rate turn. And several other turn rates.

3) It uses different colored LEDS to quickly show when a turn has begun.

4) The LEDs are bright, easily observed in a bright cockpit.

5) You can see them with sunglasses on, even polarized sunglasses (unlike many LCD screens.)

6) And unlike mechanical gyros, it's inexpensive (about $150).

7) And also unlike mechanical gyros, you can buy it in a tiny box (3 x 2 x 1 inch) which you can velcro to any panel. It runs off an enclosed 9v battery for about 14 hours.

8) Or you can buy it with a standard 2 1/4 inch cutout bezel.

9) Or you can buy it with an even smaller 1.75 inch square bezel.

This is how we approached the design of each of our instruments: Lots of installation and use options, bright LEDs, simple operation, really low costs. Great for experimental, homebuilt, patch flying, ultralights, and perhaps a few other markets as well. (Helicopters? Yes. Gliders? Absolutely.)

My daughter Jennifer prepared a great video demonstrating the Turn Rate Indicator. You can see the video here. If that doesn't work, go to belite's channel on youtube and you'll find several more of our avionic and flying videos.

Even though the concepts are simple, the electronic technology has been a tough at times to tackle. In order to protect the work that has been done, we recently filed 9 patent applications on our technology. As a result, our designs are 'patent pending', which is a great thing as well.

The entire instrument panel pictured at the beginning of this post weighs about 12 ounces. That includes the basic metal plate, and all of the instruments. This is one of the developments that continues to ensure that our aircraft are the best and that our avionics (and aircraft) customers have the easiest to use, lightest, least expensive and most comprehensive goodies in the cockpit.

I appreciate your feedback. I was given several great ideas for additions to this new product line at Sun N Fun -- we'll work on some of them and hopefully show even more avionics at Oshkosh. In the meantime, this is great new stuff.

Finally, these avionics are 'on sale' for this first week of their introduction. You can order them with discount code SUN10 on our webstore through the end of 2010 Sun N Fun, (april 18) and this will give you a 20% discount!

We are also intent on adding distributors, both here in the US and overseas. Interested? Let me know.

On the eve of four announcements

It is Sunday evening; my wife and I have comfortably settled into our rental home in Lakeland Florida. Sun N Fun starts in two days. Tomorrow, we're sending out four news releases.

We're exhausted. Our staff and us have been working nearly around the clock for the last couple of weeks, trying to get everything ready and buttoned up for the show.

Most of my time has been spent on the development of a suite of avionics -- you'll be able to read about them soon enough. I've already concluded that once you fly with our new air speed indicator, you'll never use any other air speed indicator again. Ours is designed from the ground up for slow experimentals and ultralights. But it's just one of ten or so new avionics we're introducing, and it is by no means the coolest. Enough said on the avionics, or I'll spill the beans prematurely.

I asked for feedback on the Trike several weeks ago. You responded; and we completely redesigned it. Take a look at the pictures which have been posted on flickr
and you'll see that the Trike is now identical to our conventional taildragger model. And you can switch back and forth easily!

The Trike pictured is powered by a MZ202 engine with 45 horsepower. It uses carbon fiber wings, and tips the scales at about 250 pounds. Amazing.!

That's all for now.

See you at Sun N Fun in two days!

James