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  #1  
Old 10-21-2013, 07:01 PM
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Jesse Jesse is offline
 
Join Date: May 2005
Location: X35 - Ocala, FL
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Default Dynamic balance results?

How many have had their -10's dynamically balanced? What was your beginning and ending numbers (ips)? I just balanced my first -10, which had been balanced before, and it took 6 runs to get from 0.263 down to 0.030.
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  #2  
Old 10-21-2013, 08:23 PM
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CharlieWaffles CharlieWaffles is offline
 
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YIO-540-D4A5 from Vans and the Hartzell 3-blade composite Semitar prop:

Out of the box, it was .092 In/S using a MicroVibII.

Was so small that we didn't try to improve it as the stock flywheels from Vans no longer have holes to be able to use to add weight. So would require removing flywheel and having it machined.

http://myrv10factory.wordpress.com/2...ing-continues/
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  #3  
Old 10-21-2013, 09:04 PM
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Walt Walt is online now
 
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Quote:
Originally Posted by CharlieWaffles View Post
YIO-540-D4A5 from Vans and the Hartzell 3-blade composite Semitar prop:

Out of the box, it was .092 In/S using a MicroVibII.

Was so small that we didn't try to improve it as the stock flywheels from Vans no longer have holes to be able to use to add weight. So would require removing flywheel and having it machined.

http://myrv10factory.wordpress.com/2...ing-continues/
No need to machine the flywheel (it would be impossible to calculate how much and where to remvoe material from anyway), in this case you just add weight to the spinner bulkhead by drilling one or two holes for the balance weights (bolts/washer) this is an approved procedure.

Continental's don't have a flywheel.

0.100 IPS is considered the after balance upper limit which you were close to, my goal is anything below .040 IPS but can usually do better.
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EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
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  #4  
Old 10-22-2013, 12:34 AM
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Default .01

Just did a balance on my Super Decathlon after a prop rebuild. Balanced it at 2500 as that is where I usually run when flopping around the sky.

Got it to .01.

First run said add 24 grams - drilled the back-plate and added washers and a nut and bolt. Second run said add 5 grams- large washer under a spinner screw. Third run we were down to .04, needed a wee bit at 9:00 - added a small washer under another of the spinner bolts. Fourth run said we were .01 - leave it alone!

Runs smooooth.
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Last edited by SMO : 10-22-2013 at 12:39 AM.
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  #5  
Old 10-22-2013, 05:17 AM
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Walt Walt is online now
 
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Quote:
Originally Posted by SMO View Post
First run said add 24 grams - drilled the back-plate and added washers and a nut and bolt. Second run said add 5 grams- large washer under a spinner screw. Third run we were down to .04, needed a wee bit at 9:00 - added a small washer under another of the spinner bolts. Fourth run said we were .01 - leave it alone!

Runs smooooth.
That's why in 99% of the cases I install weights at 2 seperate locations on the back plate or flywheel, that gives you the ability to tweak the polar location and weight. Leaving various washers under spinner bolts works but it is not a good practice or an "approved" procedure (the next time you or your A&P take the spinner off it may not go back on the the same way).
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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
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  #6  
Old 10-22-2013, 08:02 AM
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Beginning number: 0.25 IPS
Ending number: 0.07 IPS

Left it at that after one run. Definitely a noticeable difference on the next flight.
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  #7  
Old 10-22-2013, 08:44 AM
douglassmt douglassmt is offline
 
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Default N242BD

Initial number was 0.099 ips

He decided to make one try at getting it a little better, added the recommended weight (one bolt, 7 grams as I recall).

Final number was 0.028 ips. Said that was the lowest he had ever achieved.
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  #8  
Old 10-22-2013, 02:02 PM
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brianwallis brianwallis is offline
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Default Walt Knows

Walt knows what he 's talking about. I see anywhere from .2 to .5 on a regular basis prior to adding weights. Sometimes you get lucky and only need weight in one location. After years of balancing props, I've only managed to get 0.00 about 3 times. In theory you should not be able to feel 0.07. Feel free to call or PM if you have any questions.
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Last edited by brianwallis : 10-22-2013 at 02:06 PM.
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  #9  
Old 10-22-2013, 02:20 PM
jimfaber jimfaber is offline
 
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Hi Jesse,

My number started at .37 on the first run. .08 on the second and .03 on the third and final run. I noticed a big difference in smoothness.

Jim Faber
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  #10  
Old 10-22-2013, 05:29 PM
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Location: Ft. Pierce, Florida (FD88)
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Jim,

I see you are in Cocoa. Where did you have this done locally?

Jamie
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