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To:  lml@lancaironline.net
Date: Mon, 05 Nov 2012 11:37:56 -0500
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From: "Wolfgang" <Wolfgang@MiCom.net>
References: <redirect-5852840@logan.com>
Subject: Re: [LML] Re: Performance Data Walter Engine
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A quick and easy way to compare airframes for efficiency is;

K = IAS^3 X Weight / HP

You can use fuel burn instead of HP if that's more convenient.

Wolfgang

----- Original Message ----- 
From: "RONALD STEVENS" <ronald@sdc.com>
To: <lml@lancaironline.net>
Sent: Thursday, November 01, 2012 2:42 PM
Subject: Re: [LML] Re: Performance Data Walter Engine


> 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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>>> 
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>>
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>>
> 
> 
> 
>