I have a 60 clipped piper cub with a 70 4 strokes OS engine run with a 13X6, it flies like a dream, but it handles in ground like a nightmare , as soon as it gaines some speed it turns to any side some times 360 deegres I don't know what to do.
It has the original landing gear wire with a scale like wires and wheels on main, as tail wheel it has a metal mount with springs links to rudder.
I tried with toe in, camber, retrieving the cup wheel covers, retrieving the wood , giving slow thorttle or full thorttle and looking for better pilots, last time nobody can do it.
I enclose some pictures from the landing gear without the cup wheel covers and the landing gear fairings .

thank you

lalo
[email protected]

have you noticed if the plane tends to roll from one side to the other while taxing , it might be the spring on the main gear is too weak and with the narrow gear it could have a lot of body roll causing your problem

A little toe-in on the main wheels will help it track better on the ground.

Free Bird
I have been trying w/ toe in and camber at different angles with the same results, some people said that the tail wheel springs are to loose, do you think it can be the cause?
The plane flies real good with out any tendency.
Thank you
Lalo

Boothg-3
My landing gear is from the kit ones only have a scale like and no working adds.
A have compare to an original and they have the same distance apart (or spread) of wheels.
Do you think I have to put them apart more?
Thank you and sorry for my English.
Lalo

Try moving the springs on the horns (on the rudder) closer to the rudder. In other words, lessen the amount of movement of the tailwheel from side to side. Tail draggers need very little in the way of movement. Using too much travel allows the airplane to get away from you during ground steering. In fact, you can disconnect the tailwheel from the rudder, and lock it straight ahead to check this. The Cub rudder is very effective, and normally has a lot of travel. From the photo, it looks as if you have a 1:1 ratio of the rudder and the tailwheel. Trust me on this, you want very little tailwheel movement. I only fly taildraggers.

Bill, AMA 4720
WACO Brotherhood #1

Stickbuilder

Do you think it Hill be very rough for de rudder servo if I connect the tail Wheel direct to the rudder horn? I can do it via a strong spring or changing the spring for a push road
Thanks
Lalo

the tailwheel cannot be able to move easily if it can it will follow the inconsistancies of the ground it rolls over and cause your problem , a direct connection would be ok but i would try tightening the springs first

Yes, you can connect it directly to the rudder horn, but make sure to get the least amount of tailwheel travel that is possible. I'm serious, you do not want very much tailwheel travel. Look at the picture of your tailwheel wire. It is cantilevered way behind the pivot point. Any travel will be amplified. If (judging by the picture of your set-up) the rudder moves any at all, you are going to be over-driving the tailwheel. This is what makes the model so steering sensitive. Try this, Unhook the springs from the rudder horn. hook them together and to the tailwheel mount bracket, making the tailwheel straight ahead. Now try taxiing the plane. Does it still try to spin out? If not, then my point has been made. If it does still spin out, then you have an issue, either with the toe-in or the drag on the front (main) wheels. I would be willing to bet that it does not spin out as easily.

Be aware of one thing; Taildraggers are a ground loop waiting to happen. Be smooth on the rudder, and don't make big corrections. Small movements of the rudder are the order of the day. On a Cub, the rudder is very effective. So is the tailwheel.

On my WACO's, I normally limit the tailwheel travel to about 10 degrees left and right.

Bill, AMA 4720
WACO Brotherhood #1