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Buly
On Aug 7, 2006, at 10:12 AM, Yvon Cournoyer wrote:

> 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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>>
>>
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>
>
>
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Buly
http://tinyurl.com/dcy36





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