REFLECTOR: Take-off rpm

[steve korney]

Yes...That's what I mean....  Thank you...


Best... Steve




----Original Message Follows----
From: "Keith Hallsten" <KeithHallsten at quiknet.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 18:22:32 -0700

Steve,

I think you mean that torque is directly proportional to manifold pressure,
not equal to manifold pressure.

Keith


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of steve korney
Sent: Wednesday, August 22, 2007 5:53 PM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Take-off rpm

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, you're 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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