After finishing my first low wing plane I have some problems that I am sure
expert people can help me to resolve.
The plane is built from a plan. I think it is not a very common plane. It
is called fly-boy from Svenson Planes. Basically it is a low wing trainer
for .40 engine.

Take off it is not difficult but i need to put some up elevator to keep the
tail on the ground. If I do not add this up elevator the plane nose over
during take off. Any way I managed to take off ok.
Most problemas are landing. Just the momet that wheels touch the ground and
the plane nose over and hit the prop with ground. Some people told me to
bend a bit landing gear forward from the CG.

What can I do for have good landings? Some plane fixes or just something to
do handling landings?

One more time thanks and sorry for my horrible ( from Spain ) english

There may be a few reasons for this:

1) maybe the grass on your field is rather high. I have a similar problem on our field. Mostly thing will be fine, but if the grass has not been cut recently and is a bit higher, I have the exact same problems as you describe. Putting on some bigger wheels, or moving /bending the landing gear a bit forward may help

2) Your landing gear is the far back, causing it to tip over. Perhaps it is mounted under the wing, almost near the CG.
change the landig gear mount then. place an extra reinforcement in the forward lower fuselage, and mount the landing gear well before the CG

Thanks for your answer.
I know there is a way to improve landings making changes in the plane but I would prefer rather some tips for flying well. As I said this problem occurs when I fly it , but some other people ( more experienced pilots ) can land it very well. The procedure some experienced pilots have told me is to put some up elevator just when front wheels of the plane hit the ground, this procedure is supossed to be the same as in take off. This sounded very strange to me and when I tried to do it, the plane would just take off again and I make a perfect touch and go.

what do you suggest??

If the plane takes off again when you apply elevator (asuming the other people on your field use this technique) I would think you have to much speed or applying to much up elevator.

I don't know your throttle settings, however, moments before touchdown, cut throttle to idle (if not already so) and start to apply a little up elevator. If all goes well, the plane should float in. If it goes up, you have to much speed.

As one put in another post : "remember elevator controls speed and engine will controls altitude"

I know does sounds strange, but I've read the exact same thing in the MS Flight Simulator Manual. On final approach, you can reduce airspeed by providing up elevator (increased drag) and your throttle is used to control your descent rate.

Remember, landings are the most difficult part of flying !

If the gear is where the plans say:

Take-offs. Apply up elevator as you advance the throttle. Many pilots (me included) hold up elevator during the taxi. This is necessary and normal on a taildragger. During take-off, as the plane starts rolling (still holding up-elevator) let it speed up a little, then start removing the up elevator. The tail will lift, but it shouldn't nose over. If it does, wait a little longer on the next take off before removing the up.

Landing: Try for a three-pointer, at least for now. This means the plane will right at stall speed when it touches. As it touches - apply up. If it flies away, you're too fast. Wait longer next time.

Good luck