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Date: Mon, 07 Aug 2006 10:12:02 -0400
From: Yvon Cournoyer <geryvon@videotron.ca>
Subject: Re: [FlyRotary] Re: PROPELLERS AND COOLING THE ROTARY
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Reply-to: Yvon Cournoyer <geryvon@videotron.ca>
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Thanks Buly, I will study this reference some more, but the Hoverhawk 
calculator does not work on my Windows XP PC. Which browser are you 
using?. Yvon.

----- Original Message ----- 
From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, August 07, 2006 6:36 AM
Subject: [FlyRotary] Re: PROPELLERS AND COOLING THE ROTARY


> 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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>
>
> --
> Homepage:  http://www.flyrotary.com/
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>