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Re: steve's dragon 13 Dec 2013 00:15 #774

now, I'm somewhere near 90 Kg, but could realistically get down to 79 Kg, though I SHOULD weigh around 75 Kg. I like food too much for sure (even though I swim 4.5 Km per week, bike, and walk at lunchtime and hike on the weekend. If I didn't exercise I'd be big as a house! Anyway, I've dropped 3 Kg over the last couple of months and will continue to do so, but even so, if I reworked the numbers, I would probably use a 90 KG pilot (which is about 200 Lb). It just opens up the dragon to a lot more people, which I think would be a good thing.

Assuming the wing doesn't have a lot of torsion, it would mainly be a matter of re-sizing the spar a bit, and maybe the spar web near the root. Using the rods rather than the tape (I recently helped a friend size a wing that way which passed the structural ultimate test, I'm pretty confident that there wouldn't be a huge penalty for that.

Additionally, I think a bit of weight could be saved by omitting the doors and use either with auto or winch launch rather than by foot. That would allow the weight to creep up to 155, if you really needed it to.

I'm not exactly sure how the configuration would need to be modified for the increase in the weight at the front though. I confess, I'm merely a stress analyst, ans not a aerodynamist or configuration specialist. We are becoming so specialized I know nearly everything about nothing at all! Anyway, I feel comfortable doing the re-sizing if there were a genius out there that could help a bit with the layout/configuration.

Kenny

--- In This email address is being protected from spambots. You need JavaScript enabled to view it., russell wilson wrote:
>
> what is your weight in kg?
>
> On Tue, Jun 14, 2011 at 12:43 PM, Kenny <kennyrayandersen@...> wrote:
>
> > **
> >
> >
> > OK, I suppose it depends on what you do. You have more wing area so more
> > lift capability. You would likely have a bigger moment at the root, which
> > you's have to account for, but I believe the way to get the payload up is to
> > increase the wing area, no?
> >
> > I'm thinking the original plans call for carbon tows (if I'm not mistaken),
> > but if carbon pultrusions were used instead, you could recover from the
> > additional span without too much impact to the weight. I can do the
> > calculations, so I'm not worried about that. I'm more worried about the
> > impact to the flight characteristics.
> >
> > I need a bigger payload, but there really isn't any alternatives to the
> > carbon dragon [that I can tell]; so, If I built one I would have to do a
> > little adjusting.
> >
> > Thoughts?
> >
> >
> > --- In This email address is being protected from spambots. You need JavaScript enabled to view it., george_rf
> > <george_rf1@> wrote:
> > >
> > >
> > > You have it backwards , there is no increase in payload due to the
> > extended wing. extending the wing will decrease the payload
> > >
> > >
> > >
> > > Disclaimer ; opinions of others will vary depending on what they’re
> > selling
> > > Â
> >
> > > This is my website
> > > curedcomposites.netfirms.com/index.html
> > > Look all you want but don't touch
> > >
> > > --- On Mon, 6/13/11, Kenny <kennyrayandersen@> wrote:
> > >
> > >
> > > From: Kenny <kennyrayandersen@>
> >
> > > Subject: [Carbondragonbuildersandpilots] steve's dragon
> > > To: This email address is being protected from spambots. You need JavaScript enabled to view it.
> > > Date: Monday, June 13, 2011, 10:02 PM
> > >
> > >
> > > Â
> > >
> > >
> > >
> > > really enjoyed watching the vids of Steve's dragon. Are there any plans
> > for this version -- lots of nice touches? What do you figure is the increase
> > in payload due to the extended wing? That's always been a problem with the
> > initial design (IMHO).

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