For speed, I use LOP 2480 RPM, 18.2 GPH, 33MAP at FL 220 or FL 230, gives 260KTAS average. 5 hour sortie duration max usually 1200nm eastbound or up to 1100nm westbound (STL to PHX common).  I know mine is not fast by IV-P standards.  Rebuilt TSIO550x by BPE w 4 blade MT.

For max endurance, I use 2300 RPM, 15gph, 31 MAP for 220-230 KTAS, now 6 hours possible, but max range doesn't really go up that much in my personal experience.

I don't see the IV-P as a short hop or pattern fun kind of plane at all.  It was built for speed and efficiency up high.  For 1100 nm trips with wife and all the clothes she can pack, you can't touch the comfort factor/speed efficiency up in the 20's.  

Bob R

On Jan 11, 2014, at 8:58 PM, Todd Long <toddlong1@gmail.com> wrote:

What is the best range speed:fuel flow people see in the IV-P?

Sent from my iPhone

> On Jan 11, 2014, at 11:28, "Bill Harrelson" <n5zq@verizon.net> wrote:
>
> Joe,
>
> The IV is a great traveling machine.  You are, however, correct in your assessment of "just for fun" flying. In that regard you just can't beat the 360.
>
> In my experience operating an IO-550 powered IV, I have found that operating at an IAS in the range that you are considering (150-160 kias) will require a fuel flow of less than 10 gph. The higher altitude you fly the lower the fuel flow and the higher the TAS.  At 14,000 ft, for example, 150 kias will produce around 190 ktas with a fuel flow of less than 9 gph (depending on weight).  This assumes, of course, LOP operation.  Flying slower than these speeds, down to 130 kias or so, would allow squeezing a tiny bit more efficiency out of the IV but it's a fairly broad topped curve at these speeds. Your actual MPG would not be dramatically better and with a headwind might even be worse.
>
> Bill Harrelson
> N5ZQ 320 2,150 hrs
> N6ZQ  IV  450 hrs
>
>
>
>
>
> LML,
>
> I've been looking at N301H (IV) as a way to get a bit more space than my 360.  301H is listed on Controller and based in palm beach.  Does anyone have any gouge on this aircraft?
>
> I'm a little concerned that at twice the $ per flight hour I won't take it up as often just for fun.  I'd be interested to hear your thoughts on cruising in a IV at max range and max endurance.  The BSFC of the TSIO-550 is only 5-10% worse than the IO-550 according to Conti.  The cruise speeds ive seen quoted are far from the published L/D MAX ( max range) speed of the IV.  Can anyone comment on operating at a more efficient 150-160kias?
>
> Joe Czabaranek
>
>
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