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Date: Thu, 01 Nov 2012 12:20:17 -0400
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Subject: Re: [LML] Re: Performance Data Walter Engine
From: Colyn Case <colyncase@earthlink.net>
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18 is realistic LOP.  might want the MP higher.

On Nov 1, 2012, at 9:58 AM, John Barrett 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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