Kitfox IV

The Beginning


Thursday 14. April 1994,   Lakeland Florida

The past days I have spent wandering around the camp ground which is hosting over a thousand aircraft having congregated at this lively airport for the air show, Sun'N'Fun in Florida . I knew it was the day of conception for the project of my dreams. I was going to order the parts to build my aircraft, the Sky Fox (Kit Fox).

 Actually the project started years ago. It is hard to set an exact date. In my youth when I built model aircraft, some of that quest for testing my engineering skills was already spinning around. The renewal of the thought finally arrived when I came in possession of that precious commodity "time". Selling my company gave me lots of that, but at first I wanted to escape the treaded path and went out into the world on travels. Wherever I went I tried to find an opportunity to fly or imagined how it would be when flying there. On my exploration of Malaysia in early 1993 the idea of soaring through their skies really got stuck in my mind.  So when it was suggested to me to do something better than traveling around the world and  find something really serious to do, I decided to build my own aircraft.

The moment I spread the news about my intentions came when I looked at  a piece of real estate,  a ranch in southern Arizona having a 7000 ft. runway and two hangars sitting there not being used. All those flashy advertisements slid past my inner vision of living communities where one has an aircraft parked in front of one side of the house and a car on the other.

In one of the many aircraft magazines going through my hand I came across an advertisement of the Sun'N'Fun event in Florida.  For me it seemed to be the right place to go and experience Experimental Aircraft on a more intimate level than the Oshkosh event later in the year. So I decided to book a week in Florida and find out what was available.

At that time not too many aircraft kits were on the market, so I attended some seminars to find out what it was all about. Some of the interest group discussions dealt mainly with problems in getting the aircraft to fly acceptably rather than to bring forth their advantages.  Thus I produced a list of aircraft kits not to consider. Of the many beautifully made up aircraft in the display area I was drawn to the Sky Star exhibition showing the latest model of the Kitfox IV Speedster. What appealed to me most was the straightforward construction with tube frame and fabric. I could relate to that as I had come experience in various tail-draggers. As of today, more than 900 have been built.  At that time I was not too thrilled about the Rotax 912  engine. It had a little too much of a hobby appearance. Thus I decided to wait with ordering the engine and by the end of the week I had signed a delivery contract for a kit of the Kitfox IV. The check I handed over was close to $ 15'000.



Here is the most important data:



Empty Weight

Gross Weight


Wing area with Flapperon

Wing loading at max

Length with wings out

Length with wings folded

Width with wings folded


Fuel tanks wing

CG datum

Most forward CG

Most rearward CG

G-load with flaps up

Stall speed

Climb rate

Cruise speed at 7000 ft

Fuel consumption



849 lb = 385 kg

1200 lb + 10% = 1320 lb = 599 kg

344 in = 874 cm

130.5 sq_ft = 12.1 sq_m

10.1 lb/ sq_ft  = 49.5 kg/sq_m

212 in  = 538 cm

234 in  = 594 cm

95 in  = 241 cm

69 in  = 175 cm

2 x 13 US-gal  = 26 US-gal = 98 L

Leading edge of wing

10.2 in (20.0% mac)

16.0 in ( 31.3 % mac)

+ 3.8 / -1.5 g

approx 35 kts

500 - 1000 ft/min depending on load

approx  80 kts

approx. 3 US-gal / h


The final weight is depending on engine and various extras. Later on instead of a Rotax an NSI engine with variable pitch prop was installed together with an oil cooler and IFR capable instrumentation.


In a later chapter I will address the flying and handling characteristics.





Kitfox IV   N4JU






The aircraft is a two seater, side by side, tail-dragger with a powerful engine, however with limited cabin space. The short-field take off capabilities are extreme having also good short-field landing abilities.



The above data is only a condensed version of the most important  ones. Look on the later pages for further information specific to the aircraft built.

For further information select from the directory at the top right

Contact address is   [email protected]

This page was last maintained  2. 9. 2008