REFLECTOR: Take-off rpm

[steve korney]

Hi Gordon...

You said std. day, 2450 rpm's and 900 msl... 260 hp IO-540...

HP=(RPM*Torque)/5252
RPM=2450
Torque = MP

2450 rpm's is .907 % of max rpm's
900 msl is about 29" of MP= .969 % of max MP(rule of thumb torque)
.907*.935=.848 % of total HP
HP=.848*260
HP=228.67

That's about 230HP give or take... At take off, Wide open throttle...

Best... Steve




----Original Message Follows----
From: <cgputney at peoplepc.com>
Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: Take-off rpm
Date: Wed, 22 Aug 2007 14:41:15 -0500

Steve, how did you estimate that HP?   Gordon.
----- Original Message -----
From: "steve korney" <s_korney at hotmail.com>
To: <reflector at tvbf.org>
Sent: Tuesday, August 21, 2007 7:26 PM
Subject: Re: REFLECTOR: Take-off rpm


 >
 >
 > So, at take off, your getting about 230 HP.....
 >
 > Best... Steve
 >
 >
 >
 >
 > ----Original Message Follows----
 > From: <cgputney at peoplepc.com>
 > Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
 > To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
 > Subject: Re: REFLECTOR: Take-off rpm
 > Date: Tue, 21 Aug 2007 19:04:55 -0500
 >
 > Dave, I have a 66" X 82" Catto three blade on a 260HP IO540.    @ 900 msl
 > std day, get 2340 static, rising to 2450 ato.   G. Putney
 >   ----- Original Message -----
 >   From: David Bertram
 >   To: reflector
 >   Sent: Tuesday, August 21, 2007 10:02 AM
 >   Subject: REFLECTOR: Take-off rpm
 >
 >
 >         Anyone one out there running an IO-540 with a fixed pitch Catto
 > three bladed prop, what rpm are you getting on take-off?  Just normal
 > conditions not high altitude or extreme temps.
 >         Dave Bertram
 >         N350TX
 >
 >
 >
 >
 >
 > 
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