CTE ("redneck" translation)

[Bill Glaze]

Somebody has too much time on their 
hands..................................Bill Glaze

Jerry Budd wrote:

>> 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
>

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