Thanks, Bill. Yes, it is often the tip speed that causes the problem. The
scimitar shape serves the same purpose as a swept wing, delaying the onset
of supersonic speeds, in this case, rotational speed, not speed of the
aircraft.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Bill Pearce" <billcpearce@xxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, May 09, 2012 10:40 AM
Subject: Re: [OM] IMG: Piaggio Propulsion Details
> Scimitar shaped blades are VERY expensive, as they are composite, not
> metal.
> The shape helps keep the blades from going supersonic, which is a very
> very
> very bad thing for a prop.
>
> Bill Pearce
>
> -----Original Message-----
> From: Jim Nichols
> Sent: Wednesday, May 09, 2012 10:18 AM
> To: Olympus Camera Discussion
> Subject: Re: [OM] IMG: Piaggio Propulsion Details
>
> I'm sure some of that is possible, Moose.
>
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message -----
> From: "Moose" <olymoose@xxxxxxxxx>
> To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
> Sent: Wednesday, May 09, 2012 4:11 AM
> Subject: Re: [OM] IMG: Piaggio Propulsion Details
>
>
>> On 5/9/2012 12:07 AM, Jim Nichols wrote:
>>> Hi Moose,
>>>
>>> I suspect that the current state of computerized design has caused
>>> several
>>> companies to experiment with shapes that offer lower sound levels and
>>> higher
>>> propulsive efficiency. I have also seen some, but can't recall just
>>> where.
>>
>> It struck me that they might well change shape with load and speed. They
>> looked thin, and thus possibly flexible. Pure
>> speculation, as I have no knowledge of aircraft engineering.
>>
>> Twisted Moose
>>
>> --
>> What if the Hokey Pokey *IS* what it's all about?
>> --
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>
>
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