Bill,

I used Van's drawings to enter engine mount dimensions into Intellicad (open
source Autocad clone).  Was somewhat successful - biggest problem is that
front and side views of gear legs (and sockets) are never shown in "full
size".   I used CAD to get "auxiliary views" of the gear legs and check
various things.  Was really hard for me to learn, and very painstaking. (I
had custom RV-4 "long gear legs" bent with RV-6 axle angle, and bought
partial engine mount for -6 with -4 gear leg sockets.  Used CAD to give me
the increase in wing incidence in 3 point attitude.)
    - Just call Van's and get them to tell you which full size dwgs you need
to buy from them - about $5 each IIRC.
    -  Maybe they'll give/sell you the RV-7 CAD dwg(s) - I doubt it, as they
sometimes invoked "proprietary info" on some of my requests.  The dwgs
for -6 were manual.  I think most dwgs for -7 are on CAD.

David

----- Original Message -----
From: "Bill Dube" <bdube@al.noaa.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, December 02, 2004 6:58 PM
Subject: [FlyRotary] Stock Engine Mount Drawings???


> Does anyone have an accurate drawing of the stock engine mount for the
> RV-7? A CAD drawing would be even better.
>
> The reason I ask is that I am planning to design and build my own engine
> mount, and I would like to "reverse engineer" the stock engine mount.
>
> In addition to simply copying the location of the gear sockets, etc, my
> plan is to do the structural analysis (FEA) on the stock mount to see how
> strong it is and what loads it was designed to take with the stock engine.
>
> While it would probably be possible for me to borrow a stock mount from
> someone at my local EAA club, mechanical drawings would be much easier
than
> painstakingly measuring each dimension and drawing it all from scratch.