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This is Jack B Hart's Legal(?) Ultralight Firefly Page
Notice to Visitors,
This page is getting out of hand. I started this page, in part, to help others who are building Kolb FireFly ultra lights, as a log of all the things that I have done to my FireFly, and as pay back to all of those who have helped me. When I started this I had no idea that it would become so long, but as time goes on, one keeps coming up with ideas on how to possibly make an incredible little plane just a little bit better and even more safe and fun to fly. I have added a section on flying techniques for people who wish to transition to a FireFly.
The changing of engines is an attempt to increase cruise range. The choice of the Victor 1 may not be the current best choice, but at the time I made the decision it appeared to me to be the best. I suspect the Victor 1 will not be the last engine on the FireFly. The Victor 1 was imported from Speedwing in Canada and is manufactured by Simonini in Italy. If you do not understand the importing process, you may want to read up a little about US Customs.
So if you are interested in reading and seeing what one old guy has gone through to fly, I welcome you to the rest of this web site. If you like some of the ideas, you are welcome to try them, but remember that with aircraft it is often better to proceed with small incremental change. That way any change that is made will probably make only a small difference in the way an aircraft flies, and this keeps the pleasure to a maximum and the surprise to a minimum. One of the objectives is to live to make another change and to fly again on another day.
Jack B. Hart FF004
Jackson, MO
10/15/2002
KOLB FIREFLY SPECIFICATIONS
| Item |
Factory |
FF004 - Rotax 447 |
FF004 - Simonini |
| Wing Span |
22 ft. |
same |
same |
| Wing Area |
117 sq. ft. |
106 sq. ft. |
106 sq. ft. |
| Length |
19' 6"(same folded) |
same |
same |
| Height |
69 in. (same folded) |
70 in. |
70 in. |
| Folded Width |
- |
- |
- |
At Wheels |
57 in. |
58 in. |
58 in. |
At Propeller |
60 in. |
60 in. |
65 in. |
| Weights |
- |
- |
- |
Empty |
less than 254 lbs. |
248 lbs.* |
252 lbs.** |
Gross |
500 lbs. |
same |
same |
| Fuel Capacity |
5 gal. |
same |
same |
| Load Factors |
- |
- |
- |
Limit |
+4g, -2g |
- |
- |
Ultimate |
+6g, -3g |
- |
- |
| Speeds |
- |
- |
- |
Never Exceed |
80 mph |
same |
same |
Top |
- |
- |
- |
FAR 103.7 |
63 mph |
- |
- |
Actual |
75 mph |
74 mph(gps) 6400 rpm~` climb prop |
- |
Cruise |
65 mph (70% power) |
- |
- |
Minimum
(no mushing) |
- |
37 mph (gps)`
35 mph (gps)~` |
- |
Stall |
- |
- |
- |
FAR 103.7 |
27 mph |
- |
- |
Clean |
33 mph |
34 mph(gps) +~`/
31 mph |
- |
Flaperons |
30 mph |
- |
- |
Ground Effect Flight |
- |
25 mphi~ |
- |
Climb |
- |
- |
- |
| Engine |
Rotax 447 |
Rotax 447 436cc |
Simonini Victor 1+ 382cc |
Power |
40 hp @ 6400 rpm |
40 hp @ 6400 rpm |
48 hp @ 6000 rpm
38 hp @ 5200 rpm |
Gearbox/Belt Ratio |
2.58:1 |
2.58:1 |
2.76:1 |
| Propeller |
IVO 60 in. |
IVO 60" 2 blades |
Powerfin, B, 65"
2 blades
9.5 degrees |
| Takeoff Distance |
150 ft. or less |
same |
same |
| Rate of Climb |
1000 fpm |
climb prop
6400 rpm max
800-1000 fpm^~
cruise prop
6000 rpm max
500-700 fpm~
5600 rpm max
500 fpm~ |
6,000 rpm max
700-800 fpm~ |
| Pilot Weight |
- |
200 lbs |
200 lbs |
| Cruise Angle of Attack |
- |
climb prop
4 Degrees (6400 rpm)~
7 Degrees (5600 rpm)~ |
- |
*Includes brakes on four inch wheels, nine inch chord ailerons,
strobe lights, vortex generators, oil in B gear box, and cockpit
adjustable trim for pitch and roll.
+Actual/Computed for 170 pound pilot.
~Vortex generators installed
^Summer - Winter with climb prop
`Altitude - 2000 ft. & average of up and down wind runs
**Includes brakes on four inch wheels, nine inch chord ailerons,
vortex generators, 2.7 lbs of coolant, electric start, battery,
cockpit adjustable radiator shutter and trim for pitch and
roll, seat cushion, and fairings on wing struts, rear of fuselage,
aileron torque tubes and push/pull tubes.
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09/30/2003