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  #51  
Old 06-20-2011, 12:03 AM
DanWright DanWright is offline
 
Join Date: Jan 2011
Location: Ridgecrest, CA
Posts: 126
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Quote:
Originally Posted by Tony_T View Post
Here is a link to the level I use...

Tony
Design drawings for your enhanced unit?
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Building RV-12 #511 in the Mojave desert (1976W reserved)

Last edited by DanWright : 06-20-2011 at 08:58 PM.
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  #52  
Old 06-20-2011, 08:42 PM
Ausflyer Ausflyer is offline
 
Join Date: Jun 2008
Location: Byron Bay, NSW
Posts: 104
Default Thanks for the advice

Dicks advice that thr resolution of these levels is 0.2 degrees does not surprise me. Perhaps like digital watches, there are only a couple of manufacturers of the basic chip, and all the watches are just variations on cases, displays, buttons etc.
Thanks for all the suggestions for a useable levels. I have ordered the one Tony chose. Sears' offering looks good too, but they wont send it overseas.
Thanks again for the great response
Rod
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  #53  
Old 06-27-2011, 01:33 PM
dick seiders dick seiders is offline
 
Join Date: Jan 2006
Posts: 875
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Finally made my digital level brkt (ala Tony T. pics) yesterday. Checked pitch on blades today and found .65 degrees difference. (67.70 and 68.35) So the Warp bubble protractor didn't do too badly. However, Sensinich says it wants diff. to be no more than .250 so reset using the digital. After 3 tries moving one blade only I managed to get 67.80 degrees to almost match the other at 67.70. It's tricky as I learned that after setting with bolts somewhat loosened the reading increases slightly when bolts are torqued. Will fly tomorrow and see if I can detect any difference. I must agree the digital is better as far as setting it up.
Thanks.
Dick Seiders
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  #54  
Old 06-28-2011, 11:43 AM
dick seiders dick seiders is offline
 
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Posts: 875
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After short test flight today I re checked the prop and readings are still w/i .1 degree. Very cool.
Dick Seiders 120093
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  #55  
Old 06-28-2011, 12:07 PM
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MartySantic MartySantic is offline
 
Join Date: Apr 2008
Location: Davenport, IA
Posts: 1,368
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Quote:
Originally Posted by DanWright View Post
Design drawings for your enhanced unit?
I built the John Bender fixture for use with a digital level. Modified it slightly by adding a angle on each side of the level. Rubber bands hold the level snugly in place. One caution, before riveting the 2nd end piece in place, put the fixture on the prop blade the ensure it fits correctly due to blade twist.

http://www.vansairforce.com/communit...stment+fixture
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RV-12 N128MS ----- Now Flying
My RV-12 Build Log - http://www.martysrv12.blogspot.com/
Davenport, IA
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  #56  
Old 07-09-2011, 02:56 PM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 4,353
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Quote:
Originally Posted by Walt View Post
I first checked Pete's RV12 with the weights installed from the previous balance and found it over the limit at approx 0.260 IPS. We removed the previous weights and started over, results below. Went from 0.460 to 0.039 IPS (the red circle in the polar plot represents the upper limit of 0.2 IPS).

Above is Pete's RV12
Below is John's RV12

Another RV12 balance for reference, initial vibration of .425 IPS, after balance .018

Took me 4 runs on John's... (note upper limit is red circle)

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Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

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
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #57  
Old 09-21-2017, 12:00 PM
AirHound AirHound is offline
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
Posts: 157
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Quote:
Originally Posted by Walt View Post
I first checked Pete's RV12 with the weights installed from the previous balance and found it over the limit at approx 0.260 IPS. We removed the previous weights and started over, results below. Went from 0.460 to 0.039 IPS (the red circle in the polar plot represents the upper limit of 0.2 IPS).

Walt I'm Doug in IL. I am waiting for hub replacement IAW theSeninich B revision exchange program. I bought my 12 built/used and it had a dynamic bal job 3 years ago. What to do now with new hub? Take off balance bolt nut and washer and hope for the best or just install new hub? And wish for the best? I don't have dynamic balance capability near by?
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  #58  
Old 09-22-2017, 08:17 PM
E. D. Eliot E. D. Eliot is offline
 
Join Date: Dec 2005
Location: San Pedro
Posts: 840
Default Request - please

Request that someone could post the drawings for the fixture again. The old drawing posts have been wiped out by? Thanks in advance.
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