Igor's Logarithmic Dimensions

[frank williams]

Could someone please fill in the dimensions ... I've misplaced by notes.

[Tim Wescott]

Igor is probably a bit less than 6dBmeter tall, and probably has a mass of around 19dBkg.  Assuming that you take dBmeter as an amplitude ratio, and dBkg as power.

[frank williams]

Thanks Tim

integral of d(cabin) / cabin = log cabin

[Paul Walker]

Thanks Tim

integral of d(cabin) / cabin = log cabin

Frank.....that integral joke is quite old.....OH.....never mind....😂

[Brett Buck]

Thanks Tim

integral of d(cabin) / cabin = log cabin

    That bit really killed down at the Mensa clubhouse.

    Brett

[frank williams]

Sorry ... I know its an old one, but I don't do dB ..... if Tim had thrown me a quaternion I could have covered that (as long as it was a left handed one) .......

......So ............. A, B, C, D, E?    also the bellcrank is 100mm, what is the pushhrod arm length?

Thanks

actually its ln rather than log

[Howard Rush]

I’m not answering your question either,  but do you have my control geometry spreadsheet?  It has Igor parameters too.

[frank williams]

No I don't have a copy of it, but I would like to since it probably does have the dimensions in question.

lonestar_77062@yahoo.com

some reviews finds that probably A=24mm, B=22mm, E=20mm, D=?,C=?

[pmackenzie]

Thanks Tim

integral of d(cabin) / cabin = log cabin

integral of d(cabin) / cabin = natural log cabin

FWIW, here are the dimensions I came up with from the paper drawings.  My elevator horn is a slider, but the nominal setting would be 20mm.
Checking in CAD, I get the same throws that Igor lists here:
http://www.netax.sk/hexoft/stunt/the_max_ii.htm

[frank williams]

Thanks Pat
I think thats what I needed.

[pmackenzie]

You might also need the length of the slot in the flap horn that the 10mm OD bearing runs in - 20.6mm.
So flap horn in effect changes length from ~32mm at neutral to ~42mm at full deflection.

[Brett Buck]

. if Tim had thrown me a quaternion I could have covered that (as long as it was a left handed one) .......

   As I recall, NASA also used the "first element is the magnitude" version, which is not just wrong, it's immoral.  My commercial space colleagues didn't take a stand on that one  - the flight software uses the Correct Lockheed Way (last element normalizes it) and the simulation truth model uses the NASA version. They also use two different rotation definitions - Q⁽⁺⁾ and Q^(-).

     Consistency is for squares, man!

   Brett

[frank williams]

There is an AIAA paper by Yazell from Honeywell titled "Origins of the Unusual Space Shuttle Quaternion Definition".  I grew up with it .... seemed like a logical choice to me.  Station software wound up with a mishmash I think.

[Air Ministry .]

You could get a similar effect, say. by bellcrank pivot to arm, over the wing ( a Z even )

so the pushrod is over the wing , parrallel . Would need a guide or two .

A cross bar at vertical wire flap horns .

As the control veered from neutral , the horn effective length would increase .

Assumeing you used tube sliders with a pivot on the cross arm .

would be fabricateble with saw hammer & pliers , if you had a vice . For those lacking a machine shop . Be easier with one though .

[Brent Williams]

Does Igor still sell the kit he mentions on his web site? What's the thickness of the steel and the OD of the ball bearing?


Motorman

1mm steel
10mm bearing