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Keith,
I normally fly at 160 kts ias at 7,500 ft. This would be about 184 kts tas ((1+.075*2)*160). This is at 2,350 rpm, 23.5" mp & 7.5 gph.
When I go up to 2,550 rpm, full throttle & 8.5 gph, my speed goes up to 170 kts ias or about 195 kts tas. I have a standard 160 hp O-320 w/Aero Composites carbon prop.
My data corresponds to the following CAFE report:
The 360 is supposed to be 10 kts faster than the 320. Your data confirms that.
I believe that my prop increases my speed by about 5 kts tas.
Lorn
Here is the Lancair 320 Per
> From: Keith Smith <keith.smith@gmail.com>
> Date: February 28, 2011 7:19:31 PM EST
>
> I posted those Lancair 360 speeds. I'm well aware that GS is not representative of aircraft performance, but it's also a guilty pleasure to track 'em :)
>
> One figure I'm truly interested in is what the maximum sustained true airspeed is in level flight for various Lancair 360s. I know my plane is good for 197ktas with me in it...no more and no less. I actually use that information as a gauge for how the plane is doing on any given day. One day I was getting 202, sustained for a few minutes in level flight. That got my attention. It turned out to be a very slight updraft. I paid the piper later on, though, entering a similar downdraft, taking me down to around 185ktas.
>
> Groundspeeds are fun to giggle over. True airspeed in level flight is something to admire. I'm guessing the cleanest 360's with 180hp power plants are good for around 205ktas, perhaps?
>
> Keith
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,790 hrs, N31161, Y47, SE Michigan
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