sandman Posted June 24, 2017 Share Posted June 24, 2017 I have a drifter with an airspeed indicator to 100 knots, I know the drifter will get no way near that in one piece so would an 80 knot indicator be better as you are using more of the indicator in the instrument. Link to comment Share on other sites More sharing options...
skippydiesel Posted June 25, 2017 Share Posted June 25, 2017 I have a drifter with an airspeed indicator to 100 knots, I know the drifter will get no way near that in one piece so would an 80 knot indicator be better as you are using more of the indicator in the instrument. In general: All Air Speed Indicators (ASI) have an error factor that can usually be found in the Pilots Operatoing Handbook (POH). It is common for the ASI to under read at slow speed, move up to be reasonably accurate in the vicinity of your cruise and over read at your high speed cruise. Other factors like aircraft attitude (climb out) may also effect accuracy of readings. The larger the instrument scale/face (small faced instruments are notoriously inaccurate - indicators only) and The larger the increments the more accurate the instrument. ( I may have expressed this badly - if the scale is spread over 50 knots it is likely that the instrument is more accurate in this range, than one that is up to 200 knots etc etc). Most instruments are calibrated to be at their most accurate in their mid range. (So if your aircraft cruises at 70 knots, an ASI that measures up to 80-100 knots should give you a reasonable level of repeatability) Link to comment Share on other sites More sharing options...
Yenn Posted June 25, 2017 Share Posted June 25, 2017 It should be easier to read smaller variations in air speed, but I doubt you would notice any difference. Link to comment Share on other sites More sharing options...
DAVID SEE Posted July 21, 2017 Share Posted July 21, 2017 I have a drifter with an airspeed indicator to 100 knots, I know the drifter will get no way near that in one piece so would an 80 knot indicator be better as you are using more of the indicator in the instrument. Hi Yen, mate I'm pretty sure I have a 80 knot asi here in the hangar somewhere if you're looking for one. Cheers Davo Link to comment Share on other sites More sharing options...
Yenn Posted July 23, 2017 Share Posted July 23, 2017 No Dave I am not loking for one. Not much use to me at 80 kts. Link to comment Share on other sites More sharing options...
Deskpilot Posted July 24, 2017 Share Posted July 24, 2017 Hi Yen, mate I'm pretty sure I have a 80 knot asi here in the hangar somewhere if you're looking for one. Cheers Davo If Yen doesn't need it, I'm in the market for one Dave. P.M. me please. FWIW, latest state of my Thruster panel Link to comment Share on other sites More sharing options...
AussieB1rd Posted November 5, 2017 Share Posted November 5, 2017 Put a photo up Dave, I might be interested as well if DP don't want it Link to comment Share on other sites More sharing options...
DAVID SEE Posted November 5, 2017 Share Posted November 5, 2017 Sorry fellows, I’ve been out of action on and off for a while. I did have a look around and found it, but it’s not 80kts it’s 100kts, sorry for a bum steer Link to comment Share on other sites More sharing options...
Deskpilot Posted November 6, 2017 Share Posted November 6, 2017 Thanks David, not sure which will be the best indicator for my Thruster. If no one else wants it, I'll pay the postage Link to comment Share on other sites More sharing options...
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