[simpits-tech] Viperpit.org SSC project a success.

Marv De Beque mdebeque at woh.rr.com
Fri Jan 23 12:20:44 PST 2004 

Forum?  What forum?

Marv


On 1/23/04 8:09 AM, "Craig Rochester" <johncraigroch at msn.com> wrote:

> Marv,
> 
> Thanks for the compliments.  Noticed the link for the mechanical deflection
> amplifier got chopped of:
> http://pages.zdnet.com/johncraigrochester/sitebuildercontent/sitebuilderpictur
> es/ssc_base_02_flex_bar.jpg
> 
> I wish we'd move over to the forum.  I don't understand the preference for
> this email based "list" format. :-(
>  
> Craig R.
> 
> 
> -----Original Message-----
> From: simpits-tech-bounces at simpits.org
> [mailto:simpits-tech-bounces at simpits.org]On Behalf Of Marv De Beque
> Sent: Thursday, January 22, 2004 7:35 PM
> To: Simulator Cockpit tech list
> Subject: Re: [simpits-tech] Viperpit.org SSC project a success.
> 
> 
> Devilishly simple!  Now I understand, I think.  You made a mechanical
> solution to the differential forces requited to operate the stick.
> 
> Nice work.
> 
> Marv
> 
> 
> On 1/22/04 6:42 PM, "Craig Rochester" <johncraigroch at msn.com> wrote:
> 
>> > The 3 axes besides pitch-down use a 1/4" rod for a bending beam.  The
>> "tube"
>> > bottoms out against a
>> > 0.035" thick piece of feeler gauge stock.  Here's a sketch:
>> > 
>> 
http://pages.zdnet.com/johncraigrochester/sitebuildercontent/sitebuilderpictur
>> > es/ssc_base_02_flex_ba
>> > r.jpg  The smaller pitch-down deflection(0.022") is mechanically amplified
>> to
>> > actuate the LVDT about
>> > the same as the pitch-up(0.17").
>> >
>> > We haven't done the hysteresis tests yet.  The prototype had about 1% IIRC.
>> > I'd guess that Dave
>> > excellent machining a heat treatment of the components will reduce the
>> > repeatability.
>> >
>> > Craig R.
>> >
>> >
>> > -----Original Message-----
>> > From: simpits-tech-bounces at simpits.org
>> > [mailto:simpits-tech-bounces at simpits.org]On Behalf Of Marv De Beque
>> > Sent: Thursday, January 22, 2004 5:55 PM
>> > To: Simulator Cockpit tech list
>> > Subject: Re: [simpits-tech] Viperpit.org SSC project a success.
>> >
>> >
>> > Tis the beauty of "Male Answer Syndrome".  You simply cry that you are
>> > disabled.  :-)
>> >
>> > I did not really look at your final design, but I did remember you had an
>> > idea using a bending beam as the main spring system and a secondary beam
>> > that amplified the amount of movement at the LVDT slug.  Did you choose
>> that
>> > design?
>> >
>> > Also, did you take repeatability measurements to see if the beam returns to
>> > center reliably?  You remember all of those headaches I went through.  :-)
>> >
>> > Marv
>> >
>> >
>> > On 1/22/04 3:25 PM, "Craig Rochester" <johncraigroch at msn.com> wrote:
>> >
>>> >> Hey Marv,
>>> >>
>>> >> "...Physiologically, it may be that as you experience negative G loading
>>> that
>>> >> one's physical strength may alter.
>>> >>
>>> >> What do you think?  :-)"
>>> >>
>>> >> I don't have a clue. :-)  Last time I speculated on this, I was 100%
>>> wrong.
>>> >> ;-)
>>> >>
>>> >> Craig R.
>>> >>
>>> >> -----Original Message-----
>>> >> From: simpits-tech-bounces at simpits.org
>>> >> [mailto:simpits-tech-bounces at simpits.org]On Behalf Of Marv De Beque
>>> >> Sent: Thursday, January 22, 2004 12:41 PM
>>> >> To: Simulator Cockpit tech list
>>> >> Subject: Re: [simpits-tech] Viperpit.org SSC project a success.
>>> >>
>>> >>
>>> >> Craig,
>>> >>
>>> >> That is a good question and I don't know, but I agree with your logic.
>>> >>
>>> >> Since I don't know, I'll succumb to Male Answer Syndrome.
>>> >>
>>> >> I think our frame of reference is based on a 1 G environment in a static
>>> >> seating position under normal physiological conditions.  It may well be
>>> that
>>> >> under negative G loading that the torso rides up in the seat and the
>>> pilots
>>> >> ability to push forward on the stick is likewise diminished.
>>> >>
>>> >> Physiologically, it may be that as you experience negative G loading that
>>> >> one's physical strength may alter.
>>> >>
>>> >> What do you think?  :-)
>>> >>
>>> >> Marv
>>> >>
>>> >>
>>> >> On 1/22/04 7:54 AM, "Craig Rochester" <johncraigroch at msn.com> wrote:
>>> >>
>>>> >>> Thanks Marv,
>>>> >>>
>>>> >>> It has been great fun working with the Viperpit.org guys.  A community
>>>> >>> project
>>>> >>> where many people
>>>> >>> brought their expertise to bear the project.
>>>> >>>
>>>> >>> Question Marv, I still don't understand the design rationale behind the
>>>> >>> pitch-down axis(16 lbs. at
>>>> >>> .030").  I have some info that calls for 29 lbs. at 0.030".  The higher
>>>> >>> value
>>>> >>> makes more sense to
>>>> >>> me. I've read that the pitch-down is more susceptible to over
>>>> controlling
>>>> >>> and
>>>> >>> that's why the set the
>>>> >>> smaller deflection.  Why would they not use the higher force?
>>>> >>>
>>>> >>> Thanks,
>>>> >>>
>>>> >>> Craig R.
>>>> >>>
>>>> >>> -----Original Message-----
>>>> >>> From: simpits-tech-bounces at simpits.org
>>>> >>> [mailto:simpits-tech-bounces at simpits.org]On Behalf Of Marv De Beque
>>>> >>> Sent: Wednesday, January 21, 2004 9:41 PM
>>>> >>> To: Simulator Cockpit tech list
>>>> >>> Subject: Re: [simpits-tech] Viperpit.org SSC project a success.
>>>> >>>
>>>> >>>
>>>> >>> Congratulations!  You guys did well!
>>>> >>>
>>>> >>> Marv
>>>> >>>
>>>> >>> On 1/21/04 9:34 PM, "Craig Rochester" <johncraigroch at msn.com> wrote:
>>>> >>>
>>>>> >>>> Dave has finished building the rig:
>>>>> >>>> http://falcon24.users.btopenworld.com/ssc05.jpg
>>>>> >>>>
>>>>> >>>> Dave tested the SSC's performance and we met the specs for the SSC:
>>>>> >>>>
>>>>> >>>> Pitch Down 16.0 lbs @ .027" ± .013"
>>>>> >>>> Pitch Up 25.0 lbs @ .171" ± .058"
>>>>> >>>> Roll 7.7 Kg = 17.0 lbs @ .110" ± .030"
>>>>> >>>>
>>>>> >>>> The bench results were:
>>>>> >>>>
>>>>> >>>> Pitch Down 7.3 Kg = 16.06 lbs @ .030"
>>>>> >>>> Pitch Up 11.4 Kg = 25.08 lbs @ .170"
>>>>> >>>> Roll 7.7 Kg = 16.94 lbs @ .118"
>>>>> >>>>
>>>>> >>>> Will be publishing drawings, BOM, etc. soon.
>>>>> >>>>
>>>>> >>>> Craig R.
>>>>> >>>>
>>>>> >>>>
>>>>> >>>>
>>>>> >>>>
>>>>> >>>> _______________________________________________
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>>>>> >>>> Thanks!
>>>> >>>
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