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  #11  
Old 09-30-2020, 05:32 PM
TXFlyGuy TXFlyGuy is offline
 
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Quote:
Originally Posted by Northernliving View Post
You can rent them here for $150. https://www.vikingaircraftengines.co...-prop-balancer

I ended up buying a balancer recently. It made an enormous difference. The engine and prop really need to be balanced together.
Thanks for the tip!
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  #12  
Old 09-30-2020, 08:58 PM
Scott Hersha Scott Hersha is offline
 
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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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  #13  
Old 10-02-2020, 09:11 AM
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Steve Melton Steve Melton is offline
 
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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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Last edited by Steve Melton : 10-02-2020 at 09:15 AM.
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  #14  
Old 10-02-2020, 09:49 AM
TXFlyGuy TXFlyGuy is offline
 
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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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  #15  
Old 10-02-2020, 09:59 AM
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Brdog42 Brdog42 is offline
 
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Quote:
Originally Posted by Steve Melton View Post
I know we could have reached .00 IPS but I don't like that, I prefer to have a slight imbalance.
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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  #16  
Old 10-02-2020, 12:34 PM
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Steve Melton Steve Melton is offline
 
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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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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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  #17  
Unread 10-15-2020, 11:36 AM
ssturges ssturges is offline
 
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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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  #18  
Unread 10-15-2020, 11:55 AM
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airguy airguy is online now
 
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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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  #19  
Unread 10-15-2020, 12:25 PM
bill.hutchison bill.hutchison is offline
 
Join Date: May 2020
Location: Northern VA
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Quote:
Originally Posted by TXFlyGuy View Post
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/
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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  #20  
Unread 10-15-2020, 12:32 PM
TXFlyGuy TXFlyGuy is offline
 
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Quote:
Originally Posted by bill.hutchison View Post
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.
Good to know.
Thanks!
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