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09-30-2020, 05:32 PM
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Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 501
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Quote:
Originally Posted by Northernliving
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Thanks for the tip!
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Annual dues paid - 6-13-2020
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09-30-2020, 08:58 PM
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Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,558
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Better listen to what Walt told you. A prop balance can involve several runs, and that’s with at least the top cowl off. Your engine can get hot. You don’t want to do this to a non-broken in engine. I’ve done several of these home built break-ins, and I’ve never done a prop balance prior to break in, and three of them were with Whirlwind 200RV’s. My chapter has a prop balancer, and we do prop balancing for neighboring chapters for a donation to our chapter, to help pay for the prop balance equipment, but you need to come here for it - KHAO in Ohio.
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SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
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10-02-2020, 09:11 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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Scott is the man for prop balancing. Mine was balanced to .02 IPS and it only took 30 minutes total but I had my cowl off and was ready to go when he arrived. I could feel the before and after difference. I know we could have reached .00 IPS but I don't like that, I prefer to have a slight imbalance.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 10-02-2020 at 09:15 AM.
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10-02-2020, 09:49 AM
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Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 501
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We have found a shop at YNG, Winner Aviation, who balances everything from piston singles to turbine twins.
And they are only 31 nm south of where my plane is.
https://winner-aviation.com/
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Annual dues paid - 6-13-2020
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10-02-2020, 09:59 AM
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Join Date: Dec 2015
Location: Cone of Confusion
Posts: 144
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Quote:
Originally Posted by Steve Melton
I know we could have reached .00 IPS but I don't like that, I prefer to have a slight imbalance.
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Steve, that makes me very curious! :-) I’ll have mine balanced this winter. I know very little about this. Why do you prefer a very slight imbalance? Thanks.
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Tim
1973 A150L sold 
RV-6A restoration in progress 
KCHD AZ
‘’’’’’’’‘’’__|__
*>—O-(_)-O—<*
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10-02-2020, 12:34 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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If damping and load are not sufficient to suppress the cross-coupling force, the rotor may break violently into an uncontrolled whirl orbit, or rotor whip, with an amplitude closely matching the full internal clearance in the bearing.
there is a lot of lateral damping in a crank driven rotor so whirl in a journal bearing may not be a factor for these engines. it's just a pet peeve of mine. I prefer to keep the crank and journal in contact.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 10-02-2020 at 01:21 PM.
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10-15-2020, 11:36 AM
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Join Date: Oct 2014
Location: Portland, Oregon
Posts: 53
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I have a 200RV on my RV9A. The problem I had is was no way the new brakes would hold at cruise RPM on the ground even after I removed the paint from the rotors, getting them hold at 2300 RPM still might be dicey. The balance needs to be done at cruise RMP(2300), the prop guy said 4 runs of 15-20 seconds at cruise RPM. Also Lycoming specifically says do not do this on a new engine on the ground. 20 Hours into break-in now and plan to have it balanced soon. Kind of a catch 22. No issues in flight.
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10-15-2020, 11:55 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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I too had trouble getting mine to hold at 2500 - until I put the prop control full forward for 2700 rpm - that way it maintains a flat pitch at 2500, consumes much less horsepower, and produces much less thrust. The brakes should be able to hold that.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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10-15-2020, 12:25 PM
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Join Date: May 2020
Location: Northern VA
Posts: 44
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Quote:
Originally Posted by TXFlyGuy
We have found a shop at YNG, Winner Aviation, who balances everything from piston singles to turbine twins.
And they are only 31 nm south of where my plane is.
https://winner-aviation.com/
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That is a terrific shop. Friend of mine takes his Mitsubishi there for annuals and they've always done right by him. They even let me commandeer their conference room one day when we were up there and I had a work-event I had to deal with. Super nice folks.
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10-15-2020, 12:32 PM
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Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 501
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Quote:
Originally Posted by bill.hutchison
That is a terrific shop. Friend of mine takes his Mitsubishi there for annuals and they've always done right by him. They even let me commandeer their conference room one day when we were up there and I had a work-event I had to deal with. Super nice folks.
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Good to know.
Thanks!
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Annual dues paid - 6-13-2020
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