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Date: Sat, 28 May 2005 21:54:46 -0600
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] smooooth, and no leaks :-)
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Hi Rusty,

Sounds great.  If I ever get mine flying, I'll have to come over and
get a balance job.

Bob W.


On Sat, 28 May 2005 20:11:51 -0500
"Russell Duffy" <13brv3@bellsouth.net> wrote:

> Greetings,
>  
> I'll be lazy and post the log entry for today.  It was a good day, give or
> take two ugly landings.  
>  
> Cheers,
> Rusty (daily log font enlarged for the visually challenged)
>  
>  
>  
> 5-28-05  .5 hours  /  48.2 total
> 
>  
> 
> I used my new ACES 2015 balancer today to balance the prop.  Ended up adding
> 19.3 ounces of weight at one spot.  I used 1900 rpm on the prop, which works
> out to be about 5300 on the engine.  This seemed to be about the worst spot,
> with 6000 being just a bit lower in vibration.  The instructions say to use
> a low cruise, and this is probably as low a cruise as I'll ever be at.  
> 
>  
> 
> AT 1900 prop rpm, the initial vibration reading was .45 ips, and the
> solution was to add 18.5 gms to one spot.  I used the split weight function
> to add two smaller amounts of weight to the existing spinner screw holes.
> This was great, and gave a reading of .06 ips.  I then used the balancer to
> calculate the diff in weight for the permanent spot inside the flange of the
> spinner, and it came up with 19.14 gms.  I ended up using 19.3 gms, since
> the longer screw would be more inboard, and have less effect, and also
> because I'd be drilling a hole, and removing a little weight.  This was
> perfecto, and the final run was also at .06 ips. 
> 
>  
> 
> While I had the analyzer out, I did a vibration spectrum survey at the front
> hub, and at the front housing on the engine.  At the front hub, the only
> peak was the prop itself.  On the front housing, there were no prominent
> peaks up to 10,000 hz.  To me, this means there isn't any other significant
> vibration such as rotor imbalance, flywheel, counterweights, etc.  
> 
>  
> 
> Took the plane for a quick spin around the area, and it's like night and
> day.  No more compass spinning like it's possessed from the vibration at
> full throttle.  Just dandy, and much better for my evap cores and such.    I
> still hate the fuel transfer pump though.  
> 
>  
> 
> I can also officially report that my oil leak is gone, gone, GONE!  Temps
> are awesome, but still could close the oil scoop some.  I climbed from 80 ft
> to 5000 feet at 100 mph, with a ground OAT of 88 degrees.  Max oil temp was
> 186, and coolant was 215.  The cowl baffle keeps them in the 160's for oil,
> and 180's for  water in cruise.  Running out of excuses not to fly
> someplace.   
> 
> 


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