REFLECTOR: CATTO

[Greg Poole]

...and Good Evening to you too Chuck!

Thanks for your detailed response. Was aware of the relativities of fixed 
vs. CS relative to density altitude & runway length but missed the 
connection that Dan was making - sorry!

Obviously time I was in bed!

Greg in Sydney.

----- Original Message ----- 
From: "Chuck Jensen" <cjensen at dts9000.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Tuesday, May 24, 2005 10:46 PM
Subject: RE: REFLECTOR: CATTO


> Good morning Greg (or in your case, evening),
>
> If you have a very short runway, you need to select a fine pitch prop 
> which will allow the engine to develop full RPM for max HP output for 
> takeoff.  But when you get to cruise, you want a coarse pitch prop so the 
> engine doesn't overspeed.  A cruise prop may limit your engine RPM on 
> takeoff to 2500 RPM, or so, so you aren't putting out full power, hence 
> longer TO distances.  Throw together max gross weight, high altitudes, 
> high temps and short runway and the curve of the PF (pucker factor) goes 
> up sharply.  That's when you have an extra 10,000 reasons why a CS is a 
> good idea.
>
> Chuck
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
> Behalf Of Greg Poole
> Sent: Tuesday, May 24, 2005 8:39 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: CATTO
>
>
> Hmnnn....thought we were talking cruise? ...so what does a real long 
> runway
> have to do with not sacrificing the 40kts you indicate would be lost from
> cruise?
>
> Greg
> (not a critic but if you dare to publish - you must dare to be 
> questioned!)
> ----- Original Message ----- 
> From: "Dan Fast" <onefastvelocity at yahoo.com>
> To: <Jim_Agnew_2 at yahoo.com>; "Velocity Aircraft Owners and Builders list"
> <reflector at tvbf.org>
> Sent: Tuesday, May 24, 2005 10:32 PM
> Subject: Re: REFLECTOR: CATTO
>
>
>> That might be a little over stated, but at his density
>> altitude with a 173, and the fact that he now cruises
>> at 195kt,I believe he would loose close to that much,
>> unless he had a real long runway to depart from.
>>
>>   Dan
>> --- Jim Agnew <jim_agnew_2 at yahoo.com> wrote:
>>> Dan,
>>>
>>> Do you really believe that you will lose "40" KTS!!
>>>
>>> Jim
>>> --- Dan Fast <onefastvelocity at yahoo.com> wrote:
>>> > Tom at your airport altitude and with your
>>> Airplane a
>>> > fixed pitch prop would cost you 40kts min at
>>> cruise.
>>> >   Dan
>>> > --- Tom Martino <tmartino at troubleshooter.com>
>>> wrote:
>>> >
>>> > > I seem to remember someone talking up the Catto
>>> prop
>>> > > for their Velocity.
>>> > > I'd like to hear a first hand experience ... how
>>> is
>>> > > it pitched and do
>>> > > you get adequate performance at cruise?
>>> > >
>>> > >
>>> > >
>>> > > I was told ... not matter how you look at it you
>>> > > sacrifice performance
>>> > > with a fixed pitch.  Your thoughts from first
>>> hand
>>> > > experience?
>>> > >
>>> > > >
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>>> James F. Agnew
>>> Jim_Agnew_2 at Yahoo.Com
>>> Tampa, FL
>>> Velocity 173 Elite Aircraft Completed & Flying
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>>
>>
>>
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>
>
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