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11-03-2018, 07:22 PM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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What a great offer, I lived in Ramona 20 years ago, if I ever get down that way I'll come call on you. Thanks for your service.
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7A Slider, EFII Angle 360, CS, SJ.
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11-03-2018, 09:12 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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no one should say 'no' to a prop balance
My Whirl Wind 200RV prop was initially about 0.35 ips....much better than average for a C/S prop. When Kregg Victory was done ( I think he used Dynavibe, but I forget) it was less then 0.015 ips.
I could convince myself that if I put my hand on the canopy rail, I could feel the difference. I don't really know for sure if I could feel it.
But why on earth would you ever say 'no'?
So you have a plenum. I think we can find an alternative mount point for the accelerometer, but might not need to. Your plenum must attach firmly at the front of the engine somewhere to the case. Where ever that attachment is, put the accelerometer there.
I would say anyone within an hour's flight of Ramona that has not had a dynamic prop balance should call 'jask' and make an appointment.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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11-04-2018, 06:26 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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How much is prop and how much is spinner?
The whole thread calls this prop balance, but during a Hartzell factor tour I watched them balance check each prop at the end of the line. Many needed nothing some, only needed a #10 washer or half washer.
But - the back plate using a fiberglass nose cone seems like it could generate quite the opportunity for imbalance, not to mention uneven painting.
What is your experience with metal spinners vs glass ones for initial imbalance?
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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11-04-2018, 08:17 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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Quote:
Originally Posted by jask
One of the publications on prop balancing describes how to measure propeller track and the limitations. The spark plugs are removed, engine rotated and blade track is noted. I'm sure you could do the same for blade pitch. That is corrected by work on the propeller or prop mounting, not balancing.
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At least on helicopters, the track was tested dynamically. I wouldn't expect a static prop track to do more than verify the prop mounting.
Dave
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11-04-2018, 09:14 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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My DSS balancer is certainly capable of Dynamic blade tracking (normal stuff on Helos) , but because tracking is not generally performed on aircraft I didn't purchase this option.

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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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11-04-2018, 09:21 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by BillL
The whole thread calls this prop balance, but during a Hartzell factor tour I watched them balance check each prop at the end of the line. Many needed nothing some, only needed a #10 washer or half washer.
But - the back plate using a fiberglass nose cone seems like it could generate quite the opportunity for imbalance, not to mention uneven painting.
What is your experience with metal spinners vs glass ones for initial imbalance?
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Hartzell static balances their props, not at all the same thing as dynamic balance after you add all the other stuff like flywheel, spinner bulkhead, spinner etc..
(Hartzell recommends dynamic balancing in their owners manual)
I've seen quite a few cracked metal spinners but never a cracked fiberglass one.
For initial "imbalance" not much different between metal and glass, seen quite a few bad ones in both camps.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 11-04-2018 at 09:23 AM.
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11-04-2018, 01:05 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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Quote:
Originally Posted by BillL
The whole thread calls this prop balance, but during a Hartzell factor tour I watched them balance check each prop at the end of the line. Many needed nothing some, only needed a #10 washer or half washer.
But - the back plate using a fiberglass nose cone seems like it could generate quite the opportunity for imbalance, not to mention uneven painting.
What is your experience with metal spinners vs glass ones for initial imbalance?
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You are really balancing the engine/prop system, with all its attachments. At least in my case, the balance weights (bolt and washers) were attached to the ring gear.
I did have a friend with a poorly fitting spinner -- the attach screws were continually working loose and the spinner screw holes were wearing oval. He could not get a good dynamic balance until that was fixed. So it does show that there is some participation in the balance from the spinner, even though it is pretty light, and not very far from the rotation axis.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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11-04-2018, 01:12 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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I've been balancing props for a few years now. One difference I notice is that there seems to be a lot less cracking of baffling and other metal parts on the airplanes that have their props balanced.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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