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Image of AVRUL Pen

Simply read off the result



Switch it on

First, swith it on!

In order to make accurate measurements, the pen’s tip needs to be extended.

Measure distance on chart

Next, measure your flight distance.

Place the AVRUL on a “half mil” (1:500000) aeronautical chart and read the distance in nautical miles from the tip of the pen along the blue stripe.

Read measurements

Then, simply read what you have measured.

Note your distance measurement with your thumb and align it with the ground speed you are flying with. This is going to be your flight time in minutes.

Slide the clip around

If the clip obstructs the readings.

Part of the conversion chart is always covered by the pen’s clip. If this happens to be the case when you need exactly that section, simply push the clip away. Slide/rotate it around the barrel.



Flight above the clouds
Avatar picture of a pilot

Mine just arrived today from Kickstarter and was showing it to a friend, and the cheek nicked it! Just said: “Oh, that’s cool! I am keeping it…! Anyways, I ordered another pair, happy days.


Commercial Pilot

Avatar picture of a pilot

It is so much easier and quicker to use than the fiddly flight computer. Passed my skills test with flying colours. Thank you!

Ava Simpson

ex Trainee Pilot

Avatar picture of a pilot

Very simple and it works! Nowadays pilots are over-reliant on complex technology that breaks. You always use a pen when flying. Avrul gives you one more trick in the sleeve.

Phillip Strong

Bush Pilot

Avatar picture of a pilot

It is such a great idea. Absolutely love it! I recommend it to all student pilots. It is a must have for dead reckoning navigation and diversions.


Flight Instructor



CAD design stage of AVRUL Pen

Back in 2015 a student pilot was preparing for his PPL Skills Test. Needless to say he was very nervous about the exam. Especially about the navigation part when you are required to divert from your pre-planned route. And can you blame him? It is frustrating enough to fly an aeroplane with an examiner sat next to you. On the top of that being rubbish at doing maths in your head does not help at all.

What it did help, was to put marks on the pencil every 5 nautical miles and pre-calculate the flight times at different speeds on a separate piece of paper.

It worked! He passed the Skills Test. Then, a lightbulb moment. Can this piece of paper be wrapped around the barrel of a pen? You use one anyways when flying, why not be able to use it as a navigation aid too?

This marked the beginning of the “4P Pen” Project on KICKSTARTER. Yes, we know that “4P Pen” is a dull name, but you got to give him that he was not the brightest. After all he couldn’t tell you how long will take him to fly 23 miles at 110 knots… The name AVRUL comes from Aviation Ruler. It was given by the Legend and gentleman Captain Tom Rule. Many thanks Sir!

From struggles in maths, pencil and piece of paper, the AVRUL idea became reality thanks to the great help from many fellow pilots around the world who chipped in to fund the project on Kickstarter.

Join Us


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Join the AVRUL squadron and help us accomplish the mission to get this pen into every pilot’s flight bag.

Flight School?

Add a unique product to your inventory.

Include this awesome pen into the welcome pack of your newly signed-up student pilots.

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Contact AVRUL Tower via the radios below.



View of an instrument panel inside an aeroplane's cockpit