HI
I have not long built a hirobo Sceadu
Its had 36 flights with it and everything is a ok
Except its killing exhausts

The stock one that came with the kit kept coming apart at the center
Tried everything to stop it
So the shop that I bought it from advised me to try a tuned pipe so they supplied
A Zimmerman that fell apart at a joint after 4 flights and the supplier said it has been cooked
But supplied another one

So I fitted it and a cooling shroud and the shop set up the helli in order not to have the same happen again
It was great for 6 flights and fell apart at the same joint

Sceadu 30 size
Ervine 39
Running on prosynth and running slightly rich
Head speed 1600
Does not appear to have any vibration
Or high frequency vibration fuel is running clear
Engine / fan / and clutch assembly is all in balance

Could this be caused by the clutch spindle having any run off
And if so what tolerance is acceptable ?

Much appreciate any help
Thanks
Geoff