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Date: Wed, 20 Oct 2004 13:49:00 -0400
From: echristley@nc.rr.com
Subject: Re: [FlyRotary] Re: radiator weight
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Cc: Deltaflyers@ernest.isa-geek.org
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----- Original Message -----
From: keltro@att.net (Kelly Troyer)
Date: Wednesday, October 20, 2004 11:46 am
Subject: [FlyRotary] Re: radiator weight

> Ernest,
>  Also depends on the size of the core.........
> 
> 
> --
> Kelly Troyer 
> Dyke Delta/13B/RD1C/EC2 
> 

Agreed.  Once I decide on and purchase cores(s),
I'll fill and weigh them, but for paper napkin work
any reasonable configuration should work for now.

I have been trying to get a rough idea of the
advantage of the remote mounted radiators we've been
discussing...playing with the numbers Jim had in his
last newsletter article.  Starting with the numbers
after moving the battery to the rear, I used a
weight of 14lbs and an arm of -12in with the
radiator in the nose under the PSRU.  Moving them
back to station 3, the arm changes to 55in.

           Weight    Arm        Moment
Original   1208.24    55.178    66,668.14
remove rad  -14      -12           168
add rad     -14       55           770

Total      1208.24    55.95     67,606.14

The radiator weight and position aren't exact, but
it just gives a rough idea.  The relocated radiator
can ALMOST eliminate the 10lb of lead shot.  I think
the difference can be made up with a larger battery
(it takes a little less than 1.3lb of battery in the
stock position to get the arm of 1lb of lead shot in
the tail post).

Jim, with an electrically dependant engine, did you
consider larger batteries rather than the shot?  

I'm putting it all in a spreadsheet which should be
specific for the Delta and have lot of default
values filled in.