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Tim(at)MyRV10.com
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 Posted: Tue Apr 18, 2006 8:18 am Post subject: Prop Balancing |
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Thought some of you might like this feedback....
Note: for the photos, and this email in a web format, see this link:
http://www.myrv10.com/N104CD/engine/PropBalance/index.html
Yesterday I had my prop balanced. It was done locally by
one of the owners of one of the main companies who build
the dynamic balancing equipment, who happens to live
right near my home base. (Dynamic Solutions systems) They
had done my Sundowner prop, so I called them again for
this one.
It's the 2-blade hartzell, for those who didn't know, so
it probably will never be as smooth as a 3-blade, but
balancing is definitely a big help towards smoothness.
As you can see by the attached chart, we did 3 engine-runs.
The first one the balance was out by .350 in/sec of
vibration. (the lowest circle on the graph)
We added a calibrated stack of washers and
bolt/nut to the ring gear in a specified location and
ran it again. It was then out, but a little less so,
and at a different angle (the 3 o'clock circle).
We then removed the weights and the machine calculated
the final solution, which was very small, equal to
only one bolt and small AN washer in one spot, and
one bolt and larger flat washer trimmed into a
2/3 moon shape on the other spot. We then
ran it again and got the results in the center.
As you can see the starting vibration was .350 in/sec,
but after balancing, it was reduced to .026 in/sec,
which is a huge reduction in overall vibration.
You feel it in the stick, and in the pedals, and it
was very reduced after the balance. We went for
a quick flight....not to test the plane but because
he wanted to see how the RV-10 flies, and I could feel
a difference there as well, and see it when I focused
hard on the panel. I paid attention a couple days ago
when flying to the visual vibration on areas that
I could see, knowing I'd be balancing the prop, and
you can actually see a difference.
Prop balancing usually costs between $150 and $175,
which is a small cost for what I think it gives you.
In addition to less buzzing vibration for the pilot,
imagine how much slower wires wear through
the insulation where they rub metal, and how much
reduced the stresses are on things like engine
mounts, glue joints, fiberglass/plexiglass
junctions where paint may crack, and all those other
things.
Just wanted to pass that along, since I've never actually
seen anyone else post data on balancing before...just
anecdotes, and I thought it would be interesting.
--
Tim Olson - RV-10 N104CD - Flying
do not archive
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randy(at)romeolima.com
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| Posted: Tue Apr 18, 2006 12:16 pm Post subject: Prop Balancing |
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Our EAA chapter bought one of these (DSS Microvibe II) and with the purchase
comes factory training, which four of us went through. We've balanced 40+
member's props now and can certainly speak to what a benefit it is. Looking
over all the data from these jobs is very interesting, but the point I think
Tim is making is important... get your prop balanced!
BTW, here's a link to info on our chapter program, other chapter might want
to consider this...
http://www.eaa105.org/Resources/resources.htm#PropBalancing
There's a link to our log which shows the results also. Compare the results
to the table on the page, interesting reading. You may see that Randy DeBauw
is one of our members and we balanced his bird as well. Ask him, I think he
felt the difference.
The complete system is about $6,000.
Randy Lervold
EAA Chapter 105, President
www.rv-3.com
www.rv-8.com
---
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Tim(at)MyRV10.com
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| Posted: Tue Apr 18, 2006 2:16 pm Post subject: Prop Balancing |
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Wow Randy, that is a great program for your club members, and
a great deal as well. You sure did a good job of compiling
some data. Surprisingly to me, you guys actually balanced out
yours even better than mine came out. At the difference between
.01X and .02X, I'm sure it gets down to basically nil, but
it's apparent that you do a good job and take your time.
Thanks for posting some good data. Data is hard to come
by sometimes, and you did a fantastic job!
Tim Olson - RV-10 N104CD - Flying
do not archive
Randy Lervold wrote:
[quote]
Our EAA chapter bought one of these (DSS Microvibe II) and with the
purchase comes factory training, which four of us went through. We've
balanced 40+ member's props now and can certainly speak to what a
benefit it is. Looking over all the data from these jobs is very
interesting, but the point I think Tim is making is important... get
your prop balanced!
BTW, here's a link to info on our chapter program, other chapter might
want to consider this...
http://www.eaa105.org/Resources/resources.htm#PropBalancing
There's a link to our log which shows the results also. Compare the
results to the table on the page, interesting reading. You may see that
Randy DeBauw is one of our members and we balanced his bird as well. Ask
him, I think he felt the difference.
The complete system is about $6,000.
Randy Lervold
EAA Chapter 105, President
www.rv-3.com
www.rv-8.com
---
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randy(at)romeolima.com
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| Posted: Tue Apr 18, 2006 6:48 pm Post subject: Prop Balancing |
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Thanks Tim. I need to update the log, we have another 6-8 jobs we've done
over the winter, I'll try to do that tonight. The standard or goal we've set
for ourselves is .02 IPS or better and as you can see we usually get there,
sometimes even better.
Some of these guys have been flying around for hundreds of hours with a .4
error so. Those are the fun ones to do, it's a revelation for them!
Randy
---
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