Prop vibration

[lowNslow]

Bela, great news on the prop vibration, it has inspired me to get mine done. Was wondering where and how the balance weights were attached??

Karl

[N170BP]

Back edge/flange of the spinner back-plate. Paul
drilled (1) rivet out (there are two rivets holding on
the little sheet metal "ears" that wrap around the
back edge of the blades) and put a #6 stainless
machine screw through where the rivet was (drilled
a hole in the weights and put a nylon lock-nut on the
screw to hold the whole thing together). The weight
of the #6 screw/washers/nut was calculated into
the total weight required per the Chadwick machine.

Part of the "problem" with mine was putting the
prescribed weight exactly where the Chadwick
machine wanted it to be put.... (he would have
had to drill a hole in the spinner back-plate). After
experimentation (we ran the Chadwick test 6 different
times), a different amount of weight in a slightly different
position made the Chadwick machine happy.

During the trials, he simply screwed globs of lead weight
in different positions around the spinner back plate (used
a longer screw and picked up existing holes which hold
the spinner dome on).

I might add I was cautioned to inspect the spinner back-plate/
assy more often, as a good amount of weight had to be
added (38 grams). I seem to recall him mentioning that
44 grams is the max (the Chadwick machine tips over
and gets mad if more than that weight is required....).

FWIW, Paul said mine was the worse (fixed pitch) he'd ever seen....

Hope it works for you as well as it did for me.

Bela P. Havasreti
'54 C-170B N170BP

[zero.one.victor]

Your airplane might be smoother now,Bela--but I still beat ya to Harvey! (of course,I cheated........)

Eric

[N170BP]

Shoot, you don't even have to cheat!

A rag wing will beat a stock B any day....

Bela P. Havasreti
'54 C-170B N170BP

[funseventy]

A rag wing will beat a stock B any day....


Eric,

I'd put money against that bet. Tell me when!

Kelly