REFLECTOR: engine size & CS prop

[Greg Poole]

Care to let us know what cruise/top end you are seeing with that combo Tec?
"Aus"sume you are STD RG elite from memory.

 

Greg 

  <mailto:greg at pooledresources.com.au> greg at pooledresources.com.au 

 

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of HYTEC45 at aol.com
Sent: Wednesday, 6 February 2008 01:32
To: reflector at tvbf.org
Subject: Re: REFLECTOR: engine size & CS prop

 

In a message dated 2/4/2008 4:26:44 P.M. Pacific Standard Time,
stedmanlou at adelphia.net writes:

My problem is that I am not too happy with the RPM I get on takeoff. The
best I see is about 2300.

I do not have the length and pitch of my catto at hand, however, I ran for
almost 500 hrs with a performance 3 blade (then switched to an mt, then
pitch the POS mt then went with the Catto).  While the Performance worked
good all around, giving me 2450 rpm on take-off, the Catto will give me 2335
rpm static, then once at approximately 40kts. the prop loads up and rpm
drops to 2280.  I do not see 2400 rpm until 110kts.  This being said, the
Catto, even though lugging the rpms down more than the Performance, it gives
me approximately 15% reduction in take-off distance and the acceleration is
noticeable from the seat.  Catto has the blade design down and more of the
inner portion of the blade is biting in at lower speed.  I think the
Performance is cavitating in more of the root area than the Catto until
airspeed picks up on take-off.  Once at 120kts and above, both props perform
the same.  I have a IO360 with 10-1 pistons and came ground to optomize
them.  I am putting out approximatly 220hp. which I related to Catto when I
ordered the prop.  I'm sure I have more pitch than you, however the rpms
sound right.

TEC  





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