Yes Ian I know only too well.
That is why I bought one of these
http://www.aircraftspruce.com/catalog/appages/dynavibe.php
Propeller balance is the prime and pretty much the only reason the Limbach
L1700 and L2000 Crankcase cracks.
Good balance and the case goes to TBO.
The more out of balance and the sooner the case cracks and thus well short of
TBO.
Lets not forget all the other issues that come from engine vibration generally.
Cheers.
Nige.
From: Ian Mc Phee
Sent: Sunday, July 17, 2011 5:48 PM
To: DOG LIST
Subject: [DOG mailing list] Dynamic Prop balance
I realise this is a dimonia web site and this is about a falke with L2000 and
fixed pitch prop
Trevor Mills a LAME from Cobulture (Owns a RF5) called in from his around AUS
trip in RV8 flying from Broken Hill to home and put his dynamic Prop balance on
Falke and in 5 goes he has transformed Falke from a cattle track to a Merc -
there is ZERO vibration {and I mean ZERO) in the stick and if I were deaf then
I would not know the engine was running.
In past I have done static balance but this is hugely better. It now has 3 big
washers under one screw and 2 under another
So I have learnt something. Years ago I static balanced PIK prop and it made
huge difference
Also should add over the last 3 weeks the Limbach has been hard to start bit
like it was little flooded. The fault turned out to be no or not enough oil in
carby damper. My friend did the oil change etc while I was in Tassie in May and
probably did not check oil I guess' Anyhow the plugs have had an oven cleaner
clean -perfect and now falke starts in <1sec instead of coughing and farting to
get started
So now we have 3 motorgliders without a single vibration - when you have prop
balanced you wonder why you put up with previous vibration .
I should say Trevor charged me nothing for the balancing - he just wanted to
see the smile on my face after my first flight
Ian McPhee
