[simpits-tech] Simulating g
Steve Wilson
simpits-tech@simpits.org
Tue, 8 Oct 2002 16:38:21 -0400
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<div>Having a direct link from the motor to the harness is not a=
good idea, methinks. Remember, these are kids, and if your=
contraption hurt's 'em, you're liable. Be careful is all=
I'm saying - I wouldn't touch this with a ten foot pole,=
myself.<br></div>
<div> </div>
<div>But if you want to go forward, what you want is something=
that limits the amount of end tension, be it by spring or by a=
counterweight. Then use your motor to alter the geometry=
of your mechanical doodad, or to relocate the weight. That=
way you'll disassociate the weight / spring tension, your=
G-force, from the strength of your motor. It will probably=
also give you a better way of controlling max G, which may be=
important for the smaller dudes / dudettes, and would allow you=
to use a fairly strong motor, good for reliability and=
functionality.<br></div>
<div> </div>
<div>Offered as a design philosophy only.<br></div>
<div> </div>
<div>Steve
<br>
<FONT FACE=3D"Arial" SIZE=3D2>--
<br>
Steve Wilson, mafsix@attbi.com on 10/08/2002
<br>
</FONT><br>
<br>
On Tue, 8 Oct 2002 20:15:55 +0100, Simon Kelsey wrote:<br>
::::<br>
<FONT COLOR=3D"#000080">:::: Justin,</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: If you're going to use a=
mechanical linkage.... might I</FONT><br>
<FONT COLOR=3D"#000080">:::: suggest linking it</FONT><br>
<FONT COLOR=3D"#000080">:::: to a variable resistor or=
similar setup, similar to an RC car</FONT><br>
<FONT COLOR=3D"#000080">:::: speed</FONT><br>
<FONT COLOR=3D"#000080">:::: controller (except somewhat=
larger <G>). That way you can</FONT><br>
<FONT COLOR=3D"#000080">:::: control the speed</FONT><br>
<FONT COLOR=3D"#000080">:::: of the motor.</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: Another method might be to have=
the rod (damn I hate trying to</FONT><br>
<FONT COLOR=3D"#000080">:::: explain this</FONT><br>
<FONT COLOR=3D"#000080">:::: in words... much easier with a=
diagram, but will try my best)</FONT><br>
<FONT COLOR=3D"#000080">:::: connected to a</FONT><br>
<FONT COLOR=3D"#000080">:::: contact which will switch on as=
you pull back the first inch</FONT><br>
<FONT COLOR=3D"#000080">:::: or so, then off</FONT><br>
<FONT COLOR=3D"#000080">:::: as you continue pulling back,=
then on again, and so on for as</FONT><br>
<FONT COLOR=3D"#000080">:::: many steps as</FONT><br>
<FONT COLOR=3D"#000080">:::: you need.</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: Probably method 2 would be best=
for what you need; that way</FONT><br>
<FONT COLOR=3D"#000080">:::: the motor will</FONT><br>
<FONT COLOR=3D"#000080">:::: pull, stop, then maintain that=
tension if you can put a brake</FONT><br>
<FONT COLOR=3D"#000080">:::: on it (and</FONT><br>
<FONT COLOR=3D"#000080">:::: probably will anyway depending=
on how beefy the motor is),</FONT><br>
<FONT COLOR=3D"#000080">:::: then if further</FONT><br>
<FONT COLOR=3D"#000080">:::: back pressure is maintained,=
tighten... and so on.</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: Hope this helps,</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: Simon</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: ----- Original Message=
-----</FONT><br>
<FONT COLOR=3D"#000080">:::: From: "Justin=
Messenger" <jjmessenger@yahoo.com></FONT><br>
<FONT COLOR=3D"#000080">:::: To:=
<Simpits-tech@simpits.org></FONT><br>
<FONT COLOR=3D"#000080">:::: Sent: Tuesday, October 08, 2002=
7:51 PM</FONT><br>
<FONT COLOR=3D"#000080">:::: Subject: [simpits-tech]=
Simulating g</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > Here's the deal, I am=
going to have cadets use my sim</FONT><br>
<FONT COLOR=3D"#000080">:::: > and know using a g=
suit is not practical so I want to</FONT><br>
<FONT COLOR=3D"#000080">:::: > simply cause the=
shoulder harness to tighten when the</FONT><br>
<FONT COLOR=3D"#000080">:::: > stick is pulled aft.=
I need tips to use a motor to</FONT><br>
<FONT COLOR=3D"#000080">:::: > gradually increase=
the pull as the stick is pulled</FONT><br>
<FONT COLOR=3D"#000080">:::: > back past the center=
position, How do I get a 12V DC</FONT><br>
<FONT COLOR=3D"#000080">:::: > motor to slowly=
increase tension? For now it will</FONT><br>
<FONT COLOR=3D"#000080">:::: > simply be a=
mechanical interface from the stick to the</FONT><br>
<FONT COLOR=3D"#000080">:::: > motor. I have a rod=
running from my stick under the</FONT><br>
<FONT COLOR=3D"#000080">:::: > seat to the rear of=
the pit, so I can hook the motor</FONT><br>
<FONT COLOR=3D"#000080">:::: > to the rod for=
joystick input, Is there some kind of</FONT><br>
<FONT COLOR=3D"#000080">:::: > pot I can use to=
control the motor? What should it be</FONT><br>
<FONT COLOR=3D"#000080">:::: > rated? Also,=
where would be a good motor for this</FONT><br>
<FONT COLOR=3D"#000080">:::: > use?</FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: > Justin</FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: =
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<br></div>
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