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Date: Sat, 30 Apr 2005 21:44:20 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: best climb, was: warp drive 3-blade prop
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Russell Duffy wrote:

> Have not tried higher angle of climb since new
> prop and gearbox - but, I have found that 120 MPH was the best compromise
> between climb rate and cooling with the old combination. 
>
> One other thing just came to mind while trying to figure out why my 
> best climb speed is so low.  The other day, I pretty much proved that 
> my ASI was 15 mph low at 160 mph indicated.  It seems even farther off 
> as speed increases.  It's probably safe to say that my ASI is at least 
> 10 mph low at 90, so perhaps I'm really doing 100 mph.  One of these 
> days I'll figure this all out. 
>  
> I'm off to spend the rainy afternoon in the hanger.  Today's mission 
> is to pull the cowl, and remove the giant, and un-necessary oil line 
> that runs up to my oil filter bypass block.  That will free up space 
> for the filter that I got the other day.  I hope to get a chance today 
> or tomorrow to do some test runs on the ground with, and without the 
> filter in the system.  If I show that there's now significant decrease 
> in power, I'll make a fiberglass housing for the filter inlet.  I'm 
> half hoping the filter is really restrictive so spare myself the agony :-)
>  
> Rusty (may have just purchased a Dominator gyro project to replace the 
> Sonerai)
>
>
Rusty,

Do you have the 'warts' over the static holes in the fuselage? ~10 kts 
low is a typical error for RV's without the warts. I've never checked on 
what it does on the low end, but I have personally seen the difference 
with/without at high speed. A quick check to see if it's the static 
error problem is to set your altimeter to your field elevation & then 
take off & fly a full bore high speed pass at low level (near 20' agl) 
down the runway. Check the altimeter & see if it says you are at 20' agl 
or some level below the runway elevation. If it says you are lower than 
the runway, you've got the static error.

The above is courtesy of Kevin Horton, Canadian flight test engineer & 
RV-8 builder with empirical confirmation by me on my -4.

If you've already checked this, never mind...

Charlie