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From: Dale Rogers <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Dynos II (was Re: changed to Octane)
Date: Sat, 22 Jan 2005 13:07:49 -0500
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Lynn Hanover < Lehanover@aol.com > wrote:

> Paul Yaw cannot charge enough for dyno time. If he stops work on his engines 
> to rig up a customer built engine, it will take a bunch of time and then there 
> is the possibility that the outside engine is crap and disintigrates on the 
> dyno. Then what?
> ...
> Plus the liability if your project dies on his dyno.

Lynn,

   Those two parts, I understand.  However ...

> So there is no way a popular engine builder can take time out from what he's 
> up to and blow 8 hours of his and his dyno's time. Or at least you couldn't 
> afford it if he would.
> ...
> You pay him at least for 8 hours to get less than one hour of data and tuning 
> if it doesn't blow up. 

   A year ago, when Paul gave me a quick tour of his newly 
reconstituted shop (after moving from Tucson to Phoenix) 
he actually quoted me a figure for dyno time - basically 
describing, as you said, that a session would have to be 
scheduled for at least six hours.  I figured once I got 
the engine built and run in, it would be worth $800 to get 
confirmation that I was getting the ponies I was seeking.
Perhaps he thought I was going to buy an engine from him?
I don't think so - considering that I started out asking 
about sources for some parts I needed, and talked about 
the engine I was building for my "off-road" vehicle.

   I'm assuming that this is a policy change due to his shop 
being busy enough now, that he no longer needs the income 
from taking in outside work.

> A simple chassis dyno is ... 

   Thank you very much for the idea.  It isn't directly 
applicable to my situation, because I don't have a car 
to use as a "chassis" test bed.  However, it did give me an 
idea - using a gang of disc brake assemblies, for creating 
an engine dyno that might come in at under $1000.  
(Actually, a direct coupling to the truck rear-end might 
do the job - if the brakes are big enough and I can figure 
a way to take the strain reading directly from the axel 
housing.)

Dale R.
COZY MkIV #1254