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  #1  
Old 10-14-2018, 02:12 PM
John Acardo John Acardo is offline
 
Join Date: Jan 2018
Location: Rockford Illinois
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Default RV-12 SB Sensenich prop hub

Completed installation of new replacement hub for Sensenich prop SB. The half I removed was just replaced under previous SB in 2016.

It looks identical to what I removed only black. Have very slight vibration now and checked prop track. Anyone else have this experience?

Thanks
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  #2  
Old 10-14-2018, 02:35 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Is there no more than .1 degree measured difference between the pitch angle of the two blades?

Pitch difference will cause vibration.

I have never seen the indexing barrel of adjustment pins (newer style hubs) get the blade pitch difference closer than .3 degrees or so, and it is often times even worse.
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  #3  
Old 10-15-2018, 10:30 AM
dick seiders dick seiders is offline
 
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Just installed new D1 clamping hub and set pith to 71 both blades. No vibration of any consequence and climb out good and cruise improved. (Current fuel pressure issue notwithstanding).
Dick Seiders
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  #4  
Old 10-15-2018, 06:02 PM
BigJohn BigJohn is offline
 
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Quote:
Originally Posted by dick seiders View Post
Just installed new D1 clamping hub and set pith to 71 both blades. No vibration of any consequence and climb out good and cruise improved. (Current fuel pressure issue notwithstanding).
Dick Seiders
Dick, do you mean 71 even? The KAI specifies 71.4.
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  #5  
Old 10-17-2018, 08:58 AM
dick seiders dick seiders is offline
 
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John, yes Setting is currrently at 71+/-.1. Testing no t yet extensive as flying has been curtailed by fuel pressure and flow rate problems.
Dick Seiders
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  #6  
Old 10-22-2018, 10:29 PM
dick seiders dick seiders is offline
 
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Air rough yesterday so testing prop perf was difficult but I had 4900 wot static, 4950 climb out, level at 3000 wot showed 5500 but air so rough I had to reduce speed. Will do further testing later.
Dick Seiders
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  #7  
Old 10-23-2018, 02:15 AM
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Piper J3 Piper J3 is offline
 
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4950 rpm in climb may be lugging the engine a little too much. 5150-5200 initial climb is a better pitch setting. Be careful not to set pitch aggressively course thinking it will help top end speed - not good for engine. Shoot for 133mph/115kts at 5400 RPM and you and engine will be happy. Above figures are from my experience with temp around 70F and field evaluation - 1000MSL.
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  #8  
Old 10-23-2018, 07:45 PM
dick seiders dick seiders is offline
 
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Ok Jim and thanks for the interest but haven’t I read in an earlier post that wot llevel flight
at 5650 is the best target?
Dick Seiders
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  #9  
Old 10-23-2018, 08:19 PM
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tomkk tomkk is offline
 
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Quote:
Originally Posted by dick seiders View Post
Ok Jim and thanks for the interest but haven’t I read in an earlier post that wot llevel flight
at 5650 is the best target?
Dick Seiders
IIRC, that's about the range recommended in the rotaxowner forums.
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  #10  
Old 10-24-2018, 05:51 PM
Jamesey Jamesey is offline
 
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Default Thread Drift

This was about the hub replacement. Plenty of other posts about WOT rpm etc.
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