ORIGINAL: G-Pete

Alright guys, over the winter this forum became a little dry and some of the posts heated.

Time for some fun and knowledge.

How it works:

First question – How many blades had an F6F-5 Hellcat Propeller (for an example) – Then it’s your turn to answer. Then who ever asked the question name the next guy who asks the next question – and so forth.

Rules:
Only warbird related questions model or full scale.
You can only ask 3 times a question (otherwise we get asked only from LDM, Chat Veich, Evil Merlin and all those guys)
Two part questions are allowed.
Number your question.


Alright here is my question:
Question #1
What is that and for what is it for?