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<DIV><FONT face=Arial size=2>I use a 20 lb fish scale with a length of thin rope
attached to it and put a sleeve of pipe insulation over the rope. I then
run it around the stab and anchor the scale to solid spot. Works quite
well and is very portable. Take it to the field or where ever.
Good enough for up to 1.70 size engines.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wayne Galligan</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=rbearden56@earthlink.net
href="mailto:rbearden56@earthlink.net">Randall Bearden</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, January 24, 2005 6:26
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Calculations</DIV>
<DIV><BR></DIV><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px">On 1/23/05 11:31 AM, "Ron Van Putte" <<A
href="mailto:vanputte@cox.net">vanputte@cox.net</A>>
wrote:<BR><BR></SPAN></FONT>
<BLOCKQUOTE><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"><BR>On Jan 23, 2005, at 7:22 AM, Amram Privat wrote:
<BR><BR></SPAN></FONT>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face=Arial>Does someone has an experience and can advise me on a good
software for calculating thrust based on motor output (electric), prop
size and pitch, speed weight etc etc..</FONT><FONT
face="Verdana, Helvetica, Arial"> <BR></FONT></SPAN></BLOCKQUOTE><SPAN
style="FONT-SIZE: 12px"><FONT face="Verdana, Helvetica, Arial"><BR>Go to; <A
href="http://www.motocalc.com/.">http://www.motocalc.com/.</A> They
have a program which does everything you mentioned and more. You can
download the program and use it free for 30 days. If you decide
it's what you want/need, you can pay them for it and use it from then on,
after they give you an unlocking code. <BR><BR>Ron Van Putte
<BR><BR></FONT></SPAN></BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face="Verdana, Helvetica, Arial"><BR>Thrust is measured in pounds, yes even
thrust from a propeller driven aircraft. The way full scale aircraft and
engines measure thrust is on a test stand there the engine is mounted on a
movable stand that is anchored with a force transducer calibrated in pounds.
The engine is ran up and the resultant trust is measured. <BR><BR>Apply
the same principle to our smaller model engines. You could make a stand
on wheels (to minimize friction) and anchor it with a spring scale<BR>Mount
the engine with a small tank on the stand and chose an appropriate size prop.
Run the engine up, record the RPM and the resultant trust from the
scale. Now you can see the effect of many different variables, fuel,
prop size, mixture settings, even glow plug heat ranges.<BR><BR>With all of
the data you can collect you should be able to really fine tune your
engines/fuel/props for maximum performance<BR><BR><BR>Randall
Bearden</FONT></SPAN> </BLOCKQUOTE></BODY></HTML>