Here the link to the survey in German language. 

http://www.surveymonkey.com/s/K3ZJCJJ

Here a brief translation:

Question 1: Do you like the Heinkel-Club Calendar 2012?

I like it

I don´t like it

Question 2: How do you use the calendar?

Place it on a wall

Look and achieve

Use it as a gift

Sell it

Trash it

Other