"The new airplane is slow and heavy."

Translation: Az új repülőgép lassú és nehéz.

[VojaJ.]

Is just "repülő" OK here instead of repülőgép?

[Findil]

It's correct, yes.

[Ka.Nie]

Doesn't neheez mean difficult not heavy in weight?

[Findil]

It means both. :)

[joDDAb]

It is like the German word "schwer" which also has both meanings