CTE ("redneck" translation)

[Jerry Budd]

>In a message dated 12/2/2003 1:07:22 AM Eastern Standard Time, 
>jbudd at QNET.COM writes:
>
>[Note to Robert Gainey:  The "Geek Alert" is now in effect!]
>
>By the way . All that geek language went right over my head. Quess 
>I'll just stick with the ole redneck method of movin that trim 
>thingy as required !
>
>Robert ( redneck ) Gainey


Hey RRG,

Sorry about that Geek-Speak thing!

I'll translate what I wrote into "redneck" to make it easier to unnerstan':

Remember - You did say I was a "closet redneck"!   : )

------------------------------------------------------------------------------------------------------------------------------------

OK, I'll take a shot at it. Usin' th' coefficient of thermal 
expanshun thet Gray suggested fo' fiberglass of 6.5E-6 in/in F wif a 
50 degree F temperature swin' an' a 40" equivalent fuselage len'th 
(pow'ful pushrod len'th on account o' we is assumin' th' pushrod is 
carbon fiber wif a coefficient of thermal expanshun of zero) ah git 
th' same diffruntial expanshun of 0.013" thet Jeff did, cuss it all 
t' tarnation. Usin' a large MK ho'n (~1-1/4" height) an' a 1/2" thick 
elevato' leadin' edge yields a hingi point t'pushrod attachment point 
distance of 1.5". Takin' th' arcsin(0.013/1.5) = 0.49 degree elevato' 
defleckshun! Fry mah hide!

Guys, ha'f of a degree trim change on an elevato' is a lot! Fry mah hide!

ah cain't state it in terms of how menny clicks of trim thet is 
(thet'd depend on how yer [digital] trim sensitivity is set), but ah 
can tell yo' thet most of mah planes is set up wif +/- 10 t'12 
degrees of elevato' throw. When usin' mah laser system t'set up th' 
surface defleckshuns usin' th' radios indpoint adjestment th' bess 
resolushun ah see at th' surface is ~0.075 t'0.1 degree. Th' laser 
system is accurate t'somewhut better than 0.05 degree (1/20th of a 
degree), but th' scale kin only be easily interpolated t'thet. Thet 
equates t'~ 5 t'7 bits of comman' resolushun t'trim out (assumin' 
thet yo' kin set yer radio's digital trims t'output one bit per trim 
input).

Disclaimer: YMMV

Less digress a bit.

[Note t'Billy Bob Gainey: Th' "Geek Alert" is now in effeck! Fry mah hide!]

Whuffo' is th' servos resolushun wo'se than th' comman' resolushun? 
Eff'n yo' set yer ATV t'150% an' yer servo moves +/- 45 degrees yer 
servo has a max resolushun of 90 degrees/1024 bits = 0.088 
degrees/bit. So we is pow'ful servo limited, cuss it all t' 
tarnation. Lets look at this hyar t'other way. Eff'n yo' haf a 10 bit 
resolushun system (1024 steps) an' yer usin' 2/3rd's of yer 
resolushun (on a JR thet'd be equivalent t'leavin' yer trace rate set 
at 100%) t'drive yer surfaces +/- 15 degrees th' minimum theo'etical 
surface defleckshun yo' c'd comman' is 0.044 degrees/bit. But as 
shown above yer servos is only fine t'~ 0.09 degrees at th' servo 
output wheel, o' about ha'f of th' comman' resolushun. Agin, we is 
limited by th' servo resolushun.

Jim Oddino, yo' out thar? Wanna check mah numbers?

Jeremiah

-- 
___________
Jerry Budd
mailto:jbudd at qnet.com
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