|
Well Bob, I can't remember exactly [ the design was done well over a year ago] but I think its something like 16" @ 18 deg rotation on the mains. Rotation should occur well in advance of hitting 18deg [which is really out there are far as AOA on landing or takeoff] It was enough that I wasn't worried about it [it was one of the main focus's during the design phase]. It helps having the engines over the wings, but you pay for that in other areas [ interference drag] but I'd rather deal w/ this over prop strikes :-)
At this point those parts of the design are still fairly fluid and can easily be adjusted, the complete gear is not done, but the basic geometry was worked out, it still needs some tweaking to be acceptable to me, but I'm leaving that for the day when I pull it off the shelf and start to work towards production of the parts for it. The next phase of this particular design would be a 1/4 scale model to test the aerodynamic's completely. After that's been tested and proven, its off to a proper Aerospace engineer for final structural sign-off. These step's would have to be completed before I'd even cut 1 pc of cloth or machine even 1 mold.
That's all a year or two down the road :-)
Jarrett
----- Original Message -----
From: "Rogers, Bob J." <BRogers@FDIC.gov>
Date: Wednesday, January 31, 2007 1:42 pm
Subject: [FlyRotary] Re: New Cowl Contest
> How close will the propellers come to hitting the ground on
> rotation for
> takeoff?
>
> ________________________________
>
> From: Rotary motors in aircraft [flyrotary@lancaironline.net] On
> Behalf Of H & J Johnson
> Sent: Wednesday, January 31, 2007 1:23 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: New Cowl Contest
>
> Thanks Grant, the Avanti was definatly an influence on the design,
> I was
> going for absolute cruise efficency and in the end, if its designed
> properly its possible to get some pretty interesting cruise
> projectionsfrom a design like this. It still needs to be optimized
> a bit as there
> is some issues between the nacell's and the fuze, but thats all
> fixable.I designed it entirely on SolidWorks, the fuze shape is
> controled by
> something like 85 algebra equations which are driven off of two
> 'control' splines. By dragging the points on the spline I can control
> the station curvature and smoothly transition down the length of the
> fuse, it only took 1 or 3 tries before I figured out how to make
> it all
> work :-)
>
> Jarrett
>
> ----- Original Message -----
> From: "Schemmel, Grant" <Grant.Schemmel@Aeroflex.com>
> Date: Wednesday, January 31, 2007 11:09 am
> Subject: [FlyRotary] Re: New Cowl Contest
> > > I've several airframe design's but the one that prompted me to
> > build the machine was this one[attached]. It's a four seat
> > [expandable to 6 but would be a little cramped <-- like the back
> > seat of a 172] twin, using two 20b's or two four rotor's. It
> would
> > also fly on 13b's but they would be in a minimum weight model,
> not
> > alot of amenities. <
> >
> > Way cool Jarret - looks like a cut down Piagio Avanti, one of my
> > personal favorite designs.
> > Good luck on it!
> >
> >
> > Grant Schemmel
> >
> --
>
> Homepage: http://www.flyrotary.com/
>
> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
>
|