ORIGINAL: chemie
Yes. The tuning seems fine on the stand. Like I said, the original problem was that it cut out in less than 1 second when pointing down at maybe 30-45 deg. Now, I can point down at 60 deg and get a good 5 seconds so I think things are OK to try out.
I agree.
At 60 degrees you are almost instantly uncovering the clunk.
In flight, you ( should normally ) throttle back before putting the plane into that attitude.
This permits it to run even longer even if it is sucking air... the prop gets fully unloaded as the plane picks up speed, and fuel consumption drops precipitously.
Once you level back out the clunk is covered again, and the air in the lines can quickly be expelled through the needle because of pressure differences.
Remember that with 3/4 of a tank of fuel, even 30-45 degrees of nose down, can expose the clunk too.
This was a periennial problem on my Funtana s90, which could decend nose down very slowly, particularly during inverted blenders, causing it to cut out when I pulled up....
Now I just do not attempt such manouvers with less than 3/4 of a tank full of fuel....