From: "Perry Mick" <pjmick@mail.viclink.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Performance Props
Date: Wed, 21 Apr 2004 17:12:39 -0800
Message-Id: <20040422011023.M58141@mail.viclink.com>
In-Reply-To: <list-3183475@logan.com>
References: <list-3183475@logan.com>
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On Wed, 21 Apr 2004 20:47:50 -0400, Ernest Christley wrote
> 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
> > 
> > 
> > 
> > 
> >>> Homepage:  http://www.flyrotary.com/
> >>> Archive:   http://lancaironline.net/lists/flyrotary/List.html
> > 
> > 
> 
> If I may ask, how do you re-pitch a composite prop?  I can see 
> adding a layer of glass, but can you sand it thinner or cut the tip? 
>  Both options seem like they would damage fibers, and are therefore 
> a no-no.
> 
> -- 
> http://www.ernest.isa-geek.org/
> "Ignorance is mankinds normal state,
>    alleviated by information and experience."
>                                    Veeduber
> 
You are right, I wouldn't repitch a composite prop. I would just build 
another one. I was asking for information from Bulent so I could work up 
some numbers for him to build a new prop to.

Perry