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  #1  
Old 08-24-2017, 04:13 PM
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Chattin35 Chattin35 is offline
 
Join Date: Jul 2014
Location: Boise, ID
Posts: 290
Talking Dynamic prop balancing

Hi all,

At 80 hours on my -7, I had the prop dynamically balanced. Figured I'd share the results...

My engine/prop (YIO-360-M1B / Hartzell BA from Van's) was pretty well balanced from the factory at .09. But, balancing down to .02 made the aircraft noticeably smoother. I can barely feel any vibration now when I hold my hand on the airframe.

Dynamic balancing is definitely recommended.

Here's a pic of me test flying the new config...

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  #2  
Old 08-24-2017, 04:50 PM
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ChiefPilot ChiefPilot is offline
 
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Location: Twin Cities, MN
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I've balanced a number of props for people and they all have a story similar to this.
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Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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  #3  
Old 08-25-2017, 08:54 AM
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Pilot41 Pilot41 is offline
 
Join Date: Jul 2017
Location: Florida
Posts: 10
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Quote:
Originally Posted by ChiefPilot View Post
I've balanced a number of props for people and they all have a story similar to this.
On my first plane (certified), I got the prop balanced after flying it for about 40 hours. It was a world of difference--I could put my hand on top of the panel and not feel any vibration. I took an acquaintance up for a ride and he called it "turbine smooth."

+1 for dynamic balancing.
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RV-4 N99TL
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  #4  
Old 08-25-2017, 10:21 AM
Capt_Riney Capt_Riney is offline
 
Join Date: Feb 2015
Location: Danville, Indiana
Posts: 21
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How expensive is it to have a prop dynamically balanced?
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Mark Rinehart
RV7 Quickbuilt kit
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  #5  
Old 08-25-2017, 10:42 AM
Radioflyer Radioflyer is offline
 
Join Date: Nov 2009
Location: Boston
Posts: 179
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I just had my LongEz prop dynamically balanced using the Dynavibe instrument. The baseline measurement was .46. After five iterations, we got it down to .1 and called it quits. We certainly could have done better, but felt we were at the point of diminishing return. We spent about 1.5 hrs on the procedure at $95/hr. A flight after the procedure confirmed the engine felt definitely smoother, but it wasn't a day and night difference. Let's face it, an O-320 with a light composite prop is still a reciprocating, power pulsing mass, not a turbine. It was worth the effort, though.
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  #6  
Old 08-25-2017, 12:00 PM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,130
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Quote:
Originally Posted by Capt_Riney View Post
How expensive is it to have a prop dynamically balanced?
I charge $250 for my experimental customers.
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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, 1900+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #7  
Old 08-25-2017, 02:15 PM
MercFE MercFE is offline
 
Join Date: Sep 2014
Location: Maple Valley, WA
Posts: 273
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Quote:
Originally Posted by Capt_Riney View Post
How expensive is it to have a prop dynamically balanced?
Check with your local EAA chapter to see if they have the equipment... I know one in the Puget Sound area that offers a deep discount for rental of the equipment and a knowledgeable person to help you with the work.
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  #8  
Old 08-25-2017, 03:40 PM
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ChiefPilot ChiefPilot is offline
 
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Location: Twin Cities, MN
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Quote:
Originally Posted by Capt_Riney View Post
How expensive is it to have a prop dynamically balanced?
I do RVs and similar experimentals for $100.
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Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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  #9  
Old 08-25-2017, 03:55 PM
springer springer is offline
 
Join Date: May 2012
Location: AZ/MN
Posts: 391
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Quote:
Originally Posted by ChiefPilot View Post
I do RVs and similar experimentals for $100.
I have a hundred bucks burning a hole in my pocket Brad.
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RV-4 '88-'09 Built & Sold
RV-8 Purchased
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  #10  
Old 08-25-2017, 06:39 PM
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Dbro172 Dbro172 is offline
 
Join Date: Apr 2012
Location: West Fargo, ND
Posts: 1,075
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Me too, might have to pay you a visit.
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Derek Hoeschen
EAA Tech Counselor
RV-9A #92103 - N803DK
G3X, Superior XO-320, Dual Pmags, Catto 3B
www.mykitlog.com/dbro172/

1974 Bellanca Super Viking - N16AW - Flying
RV-8 #83565 - N184DK - building
1968 Mooney M20C - N6801N - Sold
1956 C-182 - N744W - Sold
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