.010 gap too small?

[nguyen23464]

Stratus os-spec,

Just installed on my second stratus, before flight I mesaured .025 now after break in and 4 flights, im measuring a reduced .010 at home, is this too small?



Jamie

[DavidH]

It is normal for the gap to lessen after running the motor. You should be fine at .010.

David

[nguyen23464]

thanks david, I feel a little bit better about it now. Is it possible that the frame might flex onto point of contact and cause a lockout at this measurement?

[DavidH]

With a helicopter anything is possible.Since the clutch driver and fan hub are turning at the same rpm. A touch between them should not be enough to lock out PCM. Now if the dampeners are bad, there is banging happening between two surfaces. That is different.


David

[nguyen23464]

im thinking about ordering YS adapter plate 126-33 and raise the gap up a bit. But that would really bring it up to .015, almost not worth placing the order. Its either that or I have to reduce that engine shim, and I really dont feel like dial indicating that fan again.

Even though, I think your right on that gap size, I figure it probly got reduced during the first flight to .010, and I got maby about 3 more flights in after that without issue. But who knows maby the wrong move at the right time will be the one.

I think im gonna take your suggestion david, and just fly it the way it is at .010.

thanks david,

Jamie

[nguyen23464]

Got it squared away. K&S brass shims did the trick underneath the a supports. .016 shim brought it up to a gap of .026.

Thanks

Jamie

[DavidH]

That will work. Now you will be replacing the dampeners in the fan hub. The more gap the quicker they wear out.
Like I said, .010 is fine, mine is only .015 and has given no problems.
David

Originally Posted by nguyen23464

Got it squared away. K&S brass shims did the trick underneath the a supports. .016 shim brought it up to a gap of .026.

Thanks

Jamie