Well, I think I have one of the most heaviest 4p's out there (BRS
(parachute like Cirrus), Amsafe, De-ice, Reversible Prop etc etc), and my
realistic numbers are

17500ft, MAP32, 2500RPM, 18.2gph, TIT <1610, CHT<350 cruising 245kts with
FULL FUELL and 2 persons (big ones lol), 250kts with fuel at 1/2 tanks (so
weight does matter a lot).

Ronald (>200 hours IV-p, 340 Velocity, 1100 Cirrus SR22)

On 11/1/12 12:20 PM, "Bob Rickard" <r.rickard@rcginc-us.com> wrote:

John

I flew my IV-P with a BPE overhauled engine yesterday at 210, 31"MAP,
2500rpm,  17gph, indicating 255 KTAS.  And my airplane is slower than
most I think.  So that is realistic.

Bob R On Nov 1, 2012, at 7:58 AM, "John Barrett" <jbarrett@carbinge.com> wrote:

Have I missed something?  Have not flown my IVP at FL220 yet, but
economy
cruise I've heard about could be about 28" MAP burning 16-18 GPH and
around
260 kts TAS.  Are those numbers realistic?

John Barrett
N31VP  - waiting for BPE engine overhaul completion.

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Dr.
Weinsweig
Sent: Wednesday, October 31, 2012 5:50 AM
To: lml@lancaironline.net
Subject: [LML] Re: Performance Data Walter Engine

After Ronald asked about pulling back the power on a propjet, I
experimented
a bit.  On a recent flight at fl220, I pulled the power back to burn 23-25 gph
and
maintained in the 160's kias and 230's ktas in my TKS equipped propjet.

Almost piston efficiency.  Watta Plane!!!!

David Weinsweig
N750DW Propjet

weinsweigd@tsnci.com 10/23/2012 4:59:28 PM >>>

Hi Ronald,

Each propjet has somewhat different performance.  Mine with tks deicing
generally flies between 275-300 ktas in the flight levels.  fuel burn is
29-39 gph depending on altitude and power settings.

as a baseline I just flew from key west nonstop to huntington, wv at
fl210 due to strong headwinds and power pulled back some to conserve
fuel
and range. I burned 29gph with a true of around 275 ktas in 3;42 nonstop
burning through my wing fuel (112 gallons) but still having 34 gallons
in
the belly tank when i landed. I've done this same flight previously in
3:10
but the winds sucked on Sunday.  I have found that the turbine engines
just
burn fuel and 25 gph may be a little low to maintain any speed though I
do
get that low on descents.  They burn close to that at idle.

I'd be happy to discuss the good and bad of turbines and the conversion
options/shops with you if you'd like as I have had both good and bad
experiences.

David Weinsweig
N750DW Propjet
304-633-5221
weinsweigd@gmail.com

ronald@sdc.com 10/22/2012 10:13:17 AM >>>

Hello guys

Today I flew in a Bonanza with an Allison 250 Turbine, and it was
awesome. I
was very impressed by performance and the silence and no vibration.

So I got curious now about having a Walter Conversion done, but when I
was
looking for performance data (cruise/fuel flow/ economic or power @
altitudes) I could not find anything on the web?!

For example I like flying @ 17500ft, just because I can listen to the
radio
and do not have to chatter and can avoid bumps when I see one lol

So what does a walter engine burn at this altitude? Could it fly with
just
25gph and what would be its performance?
Things like that...

So does anyone have this ?  And is there anyone I could fly with (I pay
for
fuel) who can show me this in his 4p? (I live in Central Florida, but I
have
a 4p ;)

Thanks -- Ronald

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