Message-ID: <40871BB8.1010908@rfgonline.com>
Date: Wed, 21 Apr 2004 21:11:20 -0400
From: Chad Robinson <crobinson@rfgonline.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Performance Props
References: <list-3183448@logan.com>
In-Reply-To: <list-3183448@logan.com>
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Perry, if you could share the formulae you're using I'd be happy to make a 
spreadsheet calculator for this. So far I've found very complex prop 
calculators but nothing straightforward.

By the way, why are you asking desired cruise speed? 400 knots! =)

Do your calculations focus on pitch/length or do they also provide some means 
of calculating dimensions at various stations from the hub, so forming 
templates can be made?

Regards,
Chad

Perry Mick wrote:
> On Wed, 21 Apr 2004 20:19:12 -0400, Bulent Aliev wrote
> 
>>On 4/21/04 12:44 AM, "Perry Mick" <pjmick@mail.viclink.com> wrote:
>>
>>
>>>Bulent:
>>>Are you looking for a wood prop or composite? Al's method is wood, mine 
> 
> is
> 
>>>composite. I think with your HP you would need a prop similar to what 
> 
> I've
> 
>>>built for Cosman, but it still needs to be tested.
>>>
>>
>>Hi Perry, I want to build one like Al Wick and Phil Johnson did. 
>>Wood / composite prop. This way I van get some initial performance 
>>numbers for the final prop. I would like to have one like Cosmanšs,
>> but I can wait to be tested. In the mean time Išll have something 
>>to start with. Bulent
> 
> 
> Tell me:
> your engine HP at X RPM sealevel
> redrive ratio
> cruise RPM, and desired cruise speed at that RPM
> number of blades, 2 or 3 (probably 3)
> prop diameter (limited by rotation angle on a pusher)
> 
> I can work up some numbers for you to build to, blade pitch and chord.
> 
> Perry
> 
> 
> 
> 
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