|
-POSTING RULES
-Advertise in here!
-
Today's Posts
|
Insert Pics
Keep VAF
Going
w/a Donation
VAF on Twitter:
@VansAirForceNet
|
09-26-2023, 02:10 PM
|
|
|
|
Join Date: Jul 2012
Location: n. wi
Posts: 1,041
|
|
prop balance
i am going to balance my prop very soon. is the spinner part of the balancing?
what is the usual procedure? i can easily do this , i just don't know if it is needed. thanks.
__________________
Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
RV-12 airworthiness cert. 11/30/2021
first flight 7/25/2022
|
09-26-2023, 04:54 PM
|
|
|
|
Join Date: May 2009
Location: Beaumont, Texas
Posts: 382
|
|
From your signature block, it's unclear if you're flying an RV-12 or if you're talking about something else. Someone else may have to chime in if you're talking about Rotax engines.
Most people with Lycomings balance with the spinner on by weighing bolts and washers and installing them through the holes in the starter flywheel. In one instance, I've seen a builder fine tune the balancing results by putting slightly longer screws in specific spinner attach points.
__________________
David Welsh
Beaumont, TX
RV-7 N413WD
|
09-26-2023, 09:18 PM
|
|
|
|
Join Date: Jun 2008
Location: San Diego, CA
Posts: 689
|
|
I’ll take a crack at it…
When doing a prop balance what we are actually doing is balancing the “rotating assembly”. Prop, spinner, spinner bulkheads and even the crankshaft to a lesser degree. So yes, include the spinner. If you have the proper equipment but haven’t done this before, try to get someone with experience to help out. Prop balancing is IMO a combination of science and art, some peeps are really good at it and some just make things worse. Cheers
__________________
Robert Marshall
RV-3 - 500hrs
A&P / IA
Parachute Rigger
Acroduster SA750 - finished and flying
|
09-26-2023, 10:10 PM
|
|
|
|
Join Date: Dec 2013
Location: Colorado Springs, CO
Posts: 1,663
|
|
I derived my computations for balancing from this document and the tips in the DynaVibe instructions. This document shows how to plot the solution after one trial run.
https://d1wqtxts1xzle7.cloudfront.ne...OHF5GGSLRBV4ZA
__________________
Ser 140142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
|
09-27-2023, 05:45 AM
|
 |
|
|
Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 761
|
|
The link is not working for me.
__________________
Glenn Martin
Windsor, Ontario
1941 Tiger Moth
2017 Waco YMF-5
RV-14 Kit # 140694 - First Flight June 22, 2021
2023 Dues Paid
|
09-27-2023, 06:08 AM
|
|
|
|
Join Date: Jul 2012
Location: n. wi
Posts: 1,041
|
|
ok, thanks. probably the dynavibe had the answer to my question.
__________________
Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
RV-12 airworthiness cert. 11/30/2021
first flight 7/25/2022
|
09-27-2023, 06:50 AM
|
|
|
|
Join Date: Dec 2013
Location: Colorado Springs, CO
Posts: 1,663
|
|
Try this one:
https://www.bksv.com/media/doc/bo0276.pdf
It is "Static and Dynamic Balancing of Rigid Rotors" from Bruel & Kjaer back when we had an HP41C handheld calculator as the best thing going.
It discussed using the initial and trial runs to derive the solution. For our Lycomings, the solution can be vector split between the two closest bolt positions.
I wrote a perl program to do the math. It could be done in excel just as easily, or graphed on paper as the document shows.
__________________
Ser 140142, RV-14A flying - N1463
Ser 83825, RV-8 building - N8638?
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 02:05 PM.
|
