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Post by petrbilt on Jun 23, 2006 17:26:12 GMT
Great job on the new panels! They look really good so far. I've noticed a few things so far flying around the -120 series. There is a pretty bad pitch bob when holding altitude and using any time acceleration at all. Also, I set up a 300kt cruise at FL280 and about 210,000lbs weight. The N1 and engine parameters seemed good but total fuel flow was around 7200pph and I would think at that weight it would be 12000-15000pph total. I know the old straight pipers were not that fuel stingy.
Anyway a bit picky I know but was mostly curious if other folks had the pitch bobbing.
Thank you SO much gentlemen...very nice work,
Nick
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Post by aerofoto - HJG Admin on Jun 23, 2006 21:57:25 GMT
I tested each of the B707 panels extensively on 2 different computers of varying specifications .... 1 top of the line and the other fairly basic. In my observations there was a "very slight" tendancy for the aircraft to oscillate in AP controlled level flight .... but only in the following circumstances 1. Flying too low, too fast, and too heavy (assumption) with AP ALT HLD selected .... it did settle down eventually though. 2. When acquiring any particular flight level/altitude far too suddenly/abruptly. .... again it did eventually settle down nicely. In #2 case above the pitch oscillation was very minor and settled down to completly smooth flight after a few moments. I concluded the best method of altitude capture in AP controlled flight was to trim down the rate of climb to 500ft/pm .... or preferably even less .... during the last 1000 ft of climb to any target altitude (I "always" ensure my climb rate is actually only around 100ft/pm within the last 100ft of climb), engaging the "ALT HLD" tab as the altimeter needle then touches on my desired altitude. From my experience the far more gradual is altitude capture the better .... and it hugely lessens any tendancy to momentarily oscillate. On both computers my experiences were almost identical .... right throughout the B707 panel and aircraft range. I can't speak of what may happen as a result of time accelaration because I simply refuese to fly in that mode Hope that's a help Mark C AKL/NZ
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Post by jpvisser on Jun 24, 2006 8:33:42 GMT
haha, fly the DC8 first,then you'll have the panache to fly the 707 ;D
cheers
JP.
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Post by George Carty - HJG on Jun 26, 2006 7:27:28 GMT
About the fuel flow - my investigations suggest that SFC in FS9 is absolutely constant (unlike in R/L, where it is higher in cruise than at full power). I set the SFC for the JT3C engines to 0.78 lb/hr/lbf (that's fuel_flow_scalar = 1.56 in the aircraft.cfg).
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