Kitfox model III or IV??

[Miki83]

Hy guys. Is my first post in this forum. I am an Italian guy from Italy. Actually I fly with a zlin savage cub. Is the plane of my aeroclub. But now I m looking for buy my first light aircraft.
I have find it... But I m not sure what kind of model it is.
Can you help me. See the picture attached
22698

What are the main difference from model 3 and 4.
Thanks in advance to those who will be able to help me.

Miki83.

[Miki83]

I have also picture of the Wing profilehttps://uploads.tapatalk-cdn.com/20190710/48611babb4a9ecc0dd4985f85e0b2f7b.jpg

Inviato dal mio Mi A1 utilizzando Tapatalk

[rv9ralph]

I'll try to help.

The model IV had a laminar flow wing, the model III had the under camber wing.

Another main change, in order to reduce adverse yaw in turns, was to redesign the flaperon mixer. This change, if I remember correctly (if not someone please correct me), required the flaperon pushrod to be disconnected when folding the wings. The model III kept them connected and the flaperon moved to vertical when the wings approached the full rearward position when folded.

I hope this helps.

Ralph

[jrthomas]

It's not a 4. Under camber wing make it a 3 or earlier model.

[Av8r_Sed]

Most certainly is a Model III with the undercamber wing and the size of the rudder.

[avidflyer]

Not a Model 4, they have aluminum angles on top and bottom of the wing for flaperon hangers. Kitfox 1-3 have extended plywood rib tails. JImChuk

[Miki83]

OK thanks to much for the info's. I suspected it was model 3.
I have read many discussions about the differences of the two models and I have understood that the model 4 is much better.But is model 3 much more complicated to fly? Reading in this forum I got scared

[Av8r_Sed]

It’s not harder to fly. The earlier Model I to III undercamber airfoil has an aerodynamic limit that keeps the top speed limited to about 90 mph. The Model IV airfoil gives up very little on low speed performance, but can give better cruise performance.

If your mission is to fly locally and have good short field performance, either will be fine. Just find the nicest, lightest one you can afford that has the equipment you need.

A Rotax 912 is generally a better choice over a 582 unless you want to climb the two-stroke learning curve. Other engine choices can be fine, but watch out for the heavy ones like Subaru conversions.

[Miki83]

yes my idea was to use it for some local flight. I have the hills near where I live and there are so many fields of 400/500 ft. I am not hurry to find the airplane. I tried to look around.thank again for information

Inviato dal mio Mi A1 utilizzando Tapatalk

[Miki83]

Hello guys.Attached an other picture.the kitfox plate says model 2 but the engine is a 912 rotax. is it possible? https://uploads.tapatalk-cdn.com/20190903/2707a8840c2d5f74f40421a2ee9cb15b.jpg

Inviato dal mio Mi A1 utilizzando Tapatalk

[avidflyer]

Some differences that may help you identify what you have. Kitfox 1 has small doors, and is 36" wide at the top back of the seat. Later models from 2-4 are 39 1/2" wide. Kitfox 1 and 2 have lift struts that measure 98" in length. Kitfox 3 and 4 are something like 10" longer. Kitfox 1,2,an 3 have under cambered wings, and extended rib tails that support the flaperons. Kitfox 4 uses aluminum angles on top and bottom of the wing. That info should tell you what you have... JImChuk

[Miki83]

Goodafternoon guys. I have an other questione about kitfox MK2.if i found wings and levels of mk4. Can I convert a MK2 in mk4?
in addition to speed does the vne also extend?

Inviato dal mio Mi A1 utilizzando Tapatalk

[rv9ralph]

A couple of issues.

The flaperon mixer for the model IV is different from the earlier models (to improve adverse yaw issues). Because of this, the pushrod attachment is different also.

The speed limitation on the early models, I believe, is a function of flutter issues with the tail more than wing design.

Gross weight specification of the earlier models is due to several things. Size and wall thickness of several tubes in the fuselage structure.

In short. If you put Model IV wings on a Model II, you will have a Model II with Model IV wings and most limitations on the Model II apply, with different handling due to a change of airfoil.

Ralph