ORIGINAL: Campgems
First, the clunk doesn't need to reach the front of the tank, nor do you want it to as it will sometimes stick there. When you are in a dive, unless it is a dead stick dive, you are going to be dropping faster than the pull of gravity. . . . Static test, IE holding the nose down should result in a dead engine if held long enough. That is not going to happen in the air though.
Don
I agree. if you are in a dive you should be throttled back and holding it for eight or ten seconds tops. The reason to point the nose up in a ground test is to see if it leans out too much. Don't worry about a nose down test.