very strong vibration at high speed only
 

A frined of mind has a yacht, despite alighning the shafts and
balancing the props, it vibrate at high speed.
this happend after the srbd prop het some thing in the water.
any idea how to fix this vibration?

thanks

check the prop that hit something. It may be a little bent.

wrote in message
oups.com...
check the prop that hit something. It may be a little bent.


If it hit something, take it off and have it rebalanced/repaired by
a professional before it breaks his bearings, or worse.

--
Dag.

Alie,

If I read the post correctly the vibration is present despite having the
shafts and props repaired after the prop strike???

If not, have them checked. If so, the work may not have been done
correctly. It's also just possible the transmission suffered some damage to
the input shaft bearing or other internal parts.

You should, for the purpose of alignment and balancing, consider the engine,
transmission, shaft, log, strut, and prop as a monolithic structure. For
perfect running all the pieces must be in agreement/harmony.

Good luck.

Butch
"Dag Sunde" wrote in message
...
wrote in message
oups.com...
check the prop that hit something. It may be a little bent.


If it hit something, take it off and have it rebalanced/repaired by
a professional before it breaks his bearings, or worse.

--
Dag.

we are going to replace both props with new one, we also discover the
mountings were not in the right order, one mounting from the gear box
put at the engine side by mistake !!, we'll go to see trial and see if
that works. and come back
thanks