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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
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From: Bob Rickard <r.rickard@rcginc-us.com>
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John

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

Bob R=20

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 aroun=
d
> 260 kts TAS.  Are those numbers realistic?
>=20
> John Barrett
> N31VP  - waiting for BPE engine overhaul completion.
>=20
> -----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
>=20
> After Ronald asked about pulling back the power on a propjet, I experiment=
ed
> a bit. =20
>=20
> 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.
>=20
> Almost piston efficiency.  Watta Plane!!!!
>=20
> David Weinsweig
> N750DW Propjet
>=20
>=20
>>>> weinsweigd@tsnci.com 10/23/2012 4:59:28 PM >>>
> Hi Ronald,
>=20
> 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.
>=20
> 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 3:1=
0
> but the winds sucked on Sunday.  I have found that the turbine engines jus=
t
> 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.
>=20
> 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.
>=20
> David Weinsweig
> N750DW Propjet
> 304-633-5221
> weinsweigd@gmail.com=20
>=20
>=20
>=20
>>>> ronald@sdc.com 10/22/2012 10:13:17 AM >>>
> Hello guys
>=20
> 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.
>=20
> 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?!
>=20
> For example I like flying @ 17500ft, just because I can listen to the radi=
o
> and do not have to chatter and can avoid bumps when I see one lol
>=20
> 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...
>=20
> So does anyone have this ?  And is there anyone I could fly with (I pay fo=
r
> fuel) who can show me this in his 4p? (I live in Central Florida, but I ha=
ve
> a 4p ;)
>=20
> Thanks -- Ronald
>=20
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