REFLECTOR: CATTO

[Chuck Jensen]

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?
>> > >
>> > > >
>> _______________________________________________
>> > > To change your email address, visit
>> > > http://www.tvbf.org/mailman/listinfo/reflector
>> > >
>> > > Visit the gallery!  www.tvbf.org/gallery
>> > > user:pw = tvbf:jamaicangoose
>> > > Check new archives: www.tvbf.org/pipermail
>> > > Check old archives:
>> >
>> http://www.tvbf.org/archives/velocity/maillist.html
>> >
>> >
>> >
>> >
>> > __________________________________
>> > Do you Yahoo!?
>> > Yahoo! Small Business - Try our new Resources site
>> > http://smallbusiness.yahoo.com/resources/
>> > _______________________________________________
>> > To change your email address, visit
>> > http://www.tvbf.org/mailman/listinfo/reflector
>> >
>> > Visit the gallery!  www.tvbf.org/gallery
>> > user:pw = tvbf:jamaicangoose
>> > Check new archives: www.tvbf.org/pipermail
>> > Check old archives:
>> http://www.tvbf.org/archives/velocity/maillist.html
>> >
>>
>> James F. Agnew
>> Jim_Agnew_2 at Yahoo.Com
>> Tampa, FL
>> Velocity 173 Elite Aircraft Completed & Flying
>> _______________________________________________
>> To change your email address, visit
>> http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery!  www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives:
>> http://www.tvbf.org/archives/velocity/maillist.html
>>
>
>
>
> __________________________________
> Yahoo! Mail Mobile
> Take Yahoo! Mail with you! Check email on your mobile phone.
> http://mobile.yahoo.com/learn/mail
> _______________________________________________
> To change your email address, visit 
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> 


_______________________________________________
To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html