super slow and lightweight plane

[0561joni]

Hi everyone
I'm looking for some tips on how to build a very slow and light aircraft.
basic dimensions:
span less than 600mm
weight less than 40g
speed as slow as possible with good turning radius

Components:
I have 1 small engine and 2 servos

The plane I want to upgrade has a basic rib-profile (ribs out of balsa with condesator foil) and about 30 degrees of dihedral. For maneuvering there is only rudder, elevator and engine. The fuselage is one carbon stick.
Here a video of the plane: video
How would you improve the speed (slower) and reduce the turning radius - is a biplane interesting?, dihedral too big?, v-tail more efficient?

thanks for your help

[xviper]

I don't know what kind of motor you have or what type of servos, but scratch building something that light will be a challenge. If you enjoy that sort of thing, great! I doubt you can build one any lighter (or easier and cheaper) than just buying something like this out of the box:

https://www.horizonhobby.com/product/airplanes/learn-to-fly-on-my-own/ultra-micros/night-vapor-bnf-pkzu1180

I had one and flying indoors, it was so light that even ceiling fans 3 stories above (large atrium) would affect its flight. In a room like in your picture, it should do fine.
"Interesting" is in the eye of the beholder. Dihedral is for stability in a straight line and the ability to level itself after a turn and reduces the need for ailerons. V-tail is only "more efficient" in terms of making the plane go faster. You see V-tails mostly on fast planes. The conventional horizontal stabilizer and vertical rudder is more efficient for slow speed as it needs less airflow to work.