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  #21  
Old 10-10-2016, 05:19 PM
BobRv4 BobRv4 is offline
 
Join Date: Nov 2012
Location: Gilbert, AZ
Posts: 124
Default Prop

Get everything right before balance. Try and balance at cruise RPM, this is usually hard with a fixed pitch prop, since most won't Rev that high. Just try to use full throttle.
But to answer the question, won't tell me anything, I won't even worry about it.
Most props, have a sweet spot they run the smoothest, some have areas to avoid (2100-2200 example). So balance it at one rpm, closest to cruise as you can then call it good.
When you have it balanced, do a baseline run write all runs down.
Reset the box and remove all weights, if there are no weights start run 2, don't reset box.
Add weight, if it's over 12 grams (or so) split weights.
Should take 3 to 4 runs, if all the stars are aligned!
Let me know!
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  #22  
Old 10-12-2016, 02:10 PM
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snopercod snopercod is offline
 
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Location: Asheville, NC
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I have a Nov. 1 appointment at Extreme Aviation at 8A7 (NE of Charlotte) to get my prop balanced with an ACES 2020 unit. I spoke for a moment with Brian Meadows about prop clocking and he recommended what you did: One lug CW at #1 TDC. I asked him whether that was for hand propping or some other reason. He replied that it was so the prop was in the best position too accept the power pulse from the engine. I'm a little unclear on that concept, but will re-clock the prop as you and he recommend before flying over there.
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  #23  
Old 10-12-2016, 09:37 PM
BobRv4 BobRv4 is offline
 
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Not sure 100% why the prop is clocked like that but it works for me.
Good luck let me know what happens.
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  #24  
Old 10-12-2016, 09:59 PM
rv7charlie rv7charlie is offline
 
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Location: Pocahontas MS
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http://mstewart.net/super8/propclock/index.htm
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  #25  
Old 10-16-2016, 05:44 AM
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snopercod snopercod is offline
 
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Quote:
Originally Posted by BobRv4 View Post
Not sure 100% why the prop is clocked like that but it works for me.
I flew the plane yesterday with the prop clocked at the 10:30-4:30 position. There was vibration at ~1300 RPM and a little at 1800 RPM during the runup. At full power during takeoff and climbout, it wasn't too bad. (I was in the pattern with a B-17!)

All things considered, I would fly with it that way, but when I got back to the hangar I removed the prop and spinner and re-clocked it one lug Clockwise to the 1:30-7:30 position at #1 TDC. I haven't flown with it that way yet, but that's the way the balance shop wanted it.

So after over a month of checking everything I could think of and clocking the prop every which way, I've got it back to the original position. Sigh...
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  #26  
Old 10-16-2016, 07:19 AM
Robert Anglin Robert Anglin is offline
 
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Location: houston, texas
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Default yep.

Quote:
Originally Posted by snopercod View Post
I have a Nov. 1 appointment at Extreme Aviation at 8A7 (NE of Charlotte) to get my prop balanced with an ACES 2020 unit. I spoke for a moment with Brian Meadows about prop clocking and he recommended what you did: One lug CW at #1 TDC. I asked him whether that was for hand propping or some other reason. He replied that it was so the prop was in the best position too accept the power pulse from the engine. I'm a little unclear on that concept, but will re-clock the prop as you and he recommend before flying over there.
You well be fine with this appointment. We have a Prince 6879 on a 195 Hp. IO-360 that we have balanced the back plate the middle plate, the spinners as a unit, and the prop, both ways and on a bearing stand. What has been said by Bob is correct, once you put the bolts, screws and washers in it changes ever so slightly. You still need to do the dynamic balance after all that. I will try to be there to set in on your balance. Harmonics is a funny thing, what has a small vibration at 1300 RPM's may be just perfect at 2300 RPM's. Ours does. Hope to see that big smile on you face after the fact.
Yours, R.E.A. III #80888
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  #27  
Old 10-16-2016, 08:40 AM
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snopercod snopercod is offline
 
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Originally Posted by Robert Anglin View Post
Hope to see that big smile on you face after the fact.
Me too. This whole thing has been very depressing for me. When I "finished" my plane in 2014, I thought then I could just go fly it. Silly me. I've had to deal with one problem after another and after fixing each one I keep thinking, "This will be the last thing I have to deal with." This time for sure

Looking forward to meeting you in a couple weeks. Hopefully the weather will cooperate.
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  #28  
Old 10-17-2016, 03:03 PM
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snopercod snopercod is offline
 
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Two days ago I installed the prop in the "recommended" 1 o'clock-7 o'clock position, first lug CW from #1 TDC. So today I rechecked the bolt torque (it was fine), put the spinner and cowling back on and went flying for 0.8 hrs. The vibration was just terrible - much worse than before - and at all RPM up to 2750. It was real bad at 1600.

So I intend to drop back to the last good position - the first lug CCW from #1 TDC - where the vibration wasn't that bad. The balance guy will just have to deal with it.
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  #29  
Old 10-19-2016, 04:30 PM
BobRv4 BobRv4 is offline
 
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Location: Gilbert, AZ
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Ok, please keep us updates after the balance.
I really don't understand what's going on, with that big of change due to clocking.
Good luck.
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  #30  
Old 11-03-2016, 07:03 AM
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snopercod snopercod is offline
 
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Location: Asheville, NC
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Default Update - no dynamic balance yet

Update: My Nov. 1 prop balance didn't happen; I was unable make the 40 min. flight to the shop due to low clouds and fog over central NC pretty much all day. We rescheduled for yesterday but as I was strapped into my plane just about to fire her up, my cell phone rang. It was Brian from Extreme Aviation telling me that he had a family emergency and wouldn't be able to balance my prop that day. So now I'm waiting to hear back from him. For over two weeks the flying weather has been almost perfect (except for Nov. 1), but we're about to enter a bad period so I don't know when I'll get this done. Maybe somebody is trying to tell me that I should just buy a Balance Master instead?

In the meantime, I'm flying with the prop clocked in the 11-5 position (one lug CCW of #1 TDC) and the vibration isn't terribly bad.
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