Mailing List flyrotary@lancaironline.net Message #51308
From: George Lendich <lendich@aanet.com.au>
Subject: Re: [FlyRotary] Re: Fw: [TailwindForum] First Flight
Date: Thu, 27 May 2010 07:57:44 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
John,
Congratulations, I support what Ed says and add that unless you have a forced induction or Peripheral Ported engine you won't develop over 200hp. Even then you will be turning more than 6,200 rpm - more like 7,200 rpm.
George ( down under)
----- Original Message -----
Sent: Thursday, May 27, 2010 3:05 AM
Subject: [FlyRotary] Re: Fw: [TailwindForum] First Flight

Congratulations!! John

 

Everything looks pretty nominal for your set up.  Do you have an thermostat in you cooling system or not?  The reason I ask

Is while 190F if fine, but if you are current producing 135-145HP and put a 2.5:1 on it and end up producing 200 HP then your may find

Your temps are going to go over 190F.  Now if you have a thermostat holding it at that temp, then it may be that you do have sufficient capacity for more HP. 

 

200HP in a tailwind?  Boy, you are going to blow most things in the sky away.

 

Again, welcome to the rotary fly club

 

Ed

 


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John
Sent: Wednesday, May 26, 2010 10:39 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Fw: [TailwindForum] First Flight

 

This is where the numbers ended up this morning.

----- Original Message -----

From: John

To: Tailwind

Sent: Wednesday, May 26, 2010 10:21 AM

Subject: [TailwindForum] First Flight

 




First off a GREAT BIG THANKS!! to all the Tailwind drivers who took me for flights and let me handle the controls.  This morning the conditions were near perfect, so a moment of solitude with the maker, I climbed in and said, self this is the moment of truth.  First flight in a Tailwind was with Brian Alley at Urbana, 2001, and my much younger mind which absorbed the pattern and final approach like a sponge and even today it was like it happened yesterday.  Malcolm and BobD in different flights, gave me lots of pointers, there was a joke at one time that I had more time in Tailwinds than some of the owners.

 

I do need a 2.5 to 1 redrive, as the engine needs to turn faster to develop the hp.  I need to get the engine up to 6200 rpm to develop over 200 hp, but for now I'm really happy.  It is very stable, controls are very sensitive compared to the Colt.  With 4 notches of flaps the approach was too hot at 85, but on the uphill grass runway the roll out was about 500 feet

 

estimated hp         135 - 145

engine rpm                  5600

prop rpm                     2800

speed                           163

MAP                            28.5

OAT                                76 

PF                             ample

water temp                     190

oil temp                          190  I think my muffler is blocking the cowl outlet to some extent

fuel press                         42

exhaust temp                1600

 

I will be sawing half the brake pedals off, as it is too hard to taxi with the rudder with out riding the brakes.  It doesn't want to lift off well with the wheels sliding down the runway.

 

Farmer John




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