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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] PROPELLERS AND COOLING THE ROTARY
Date: Mon, 7 Aug 2006 06:36:32 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Hi Yvon,
Looks like you are over propped. here is a quote from a prop speed  
web page:http://www.hoverhawk.com/propspd.html
" To produce maximum thrust from your propeller at full power    your  
tip speed should fall between .88 and .92 mach. To move between .88  
and .92 mach usually takes a change of about 110 to 120 RPM depending  
upon the diameter of your prop. This of course varies depending on  
your particular propeller and the temperature.  Try different  
temperatures then you will see just how much the speed of sound can  
vary. You would ultimately want your propeller to reach its redline (. 
88 to .92 mach) at the same time your engine reaches its maximum rpm  
limit, its redline.  "
You should be turning the engine 6500-7000 rpm on takeoff (not  
static) for best thrust.


Bulent "Buly" Aliev
FXE Ft lauderdale, FL
http://tinyurl.com/s5xw8


On Aug 6, 2006, at 4:56 PM, Yvon Cournoyer wrote:

> I have replaced my old wood 2 blades 74'' propeller with a new 3  
> blades 72'' Warp Drive, ground adjustable.
> I have set the pitch to obtain about 4800 engine static rpm, which  
> is what I began flying with my old wood prop, some years ago.
> No other changes, yet in spite of abnormally hot and humid weather,  
> I find that both oil and coolant cool better and will allow longer  
> full power static runups.
> I have not flown the new prop yet, but I am eager to verify its  
> performance at altitude.
> Yvon.
>
>
> --
> Homepage:  http://www.flyrotary.com/
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