From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] how to tell RD units apart from visuals?
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Wed, 20 Jan 2021 10:57:59 -0500
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Other than taking it apart or rotating it to find out the gear ratio or 
direction of rotation -- I have "133 C" stamped into the casting above 
the RWS label and mine is a C. I assume the 133 is the serial number.

We do have manuals available for the EC2 and EM2. However, be aware 
there a multiple (hardware and software) versions of the EC2 out there.

Finn

On 1/19/2021 6:23 PM, Marc Wiese cardmarc@charter.net wrote:
> Is there a way to tell visually if a Tracy psru is a -B or C (? I think that was the designations?). How many models of psru's did he build? Which had what ratios?
> Do we have that info somewhere?
> There is a 13 B engine with Tracy's EC2 and EM2 for sale with a psru I'm sort of interested in. But no documentation. I think it was pulled from a Velocity project.
> MW
>
>
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