Re: Prone position.. was Re: [PSUBS-MAILIST] Carsten: Sgt. Pepper

[Coalbunny <coalbunny@vcn.com>]

Ya know, sometime back I thought of building a sub that was a 1/4 scale
replica of an airplane.  I figure they got all the right parts and they
do about the same thing....
Carl


Emile wrote:
> 
> For the "head first"interested.
> 
> There is already a lot of work done in the aircraft scene. Carsten already
> mentioned hanggliders.
> This site may contain some info for you. Some aircraft (Horten) were
> comfortable.
> http://www.nurflugel.com/Nurflugel/n_o_d/weird_index.htm
> Flying wings are another interest of me.
> 
> Groet, Emile van Essen
> 
> ----- Original Message -----
> From: "Alec Smyth" <Asmyth@changepoint.com>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, November 07, 2003 5:07 PM
> Subject: RE: Prone position.. was Re: [PSUBS-MAILIST] Carsten: Sgt. Pepper
> 
> > Hi Shawn,
> >
> > We're taking a very similar tack... my internal hull diameter is 30" and
> > a fraction, and I'm using a sloped pad just as you describe. You can
> > lock yourself in place with elbows and knees, and if that's insufficient
> > I'm thinking of a Velcro band from the pad around my back. I didn't go
> > with the hang glider idea because it seemed cumbersome in the very
> > limited space available, plus I don't think it would work inverted.
> >
> > I haven't yet gone diving as the sub is under construction, but the pad
> > is already built and I've tried it out in the garage... despite much
> > tinkering with the angle, etc. it's still pretty darned uncomfortable.
> >
> > I also note the evolutions of Graham Hawkes' designs: Deep flight I has
> > a "purist" prone position. DF II (not built) is an "angled up prone".
> > And his latest design, Aviator, uses a conventional seated position.
> > That tells me a lot, but unfortunately I'd already started when Aviator
> > showed up.
> >
> > I think there is a parallel to the rider's position on a sportbike I
> > used to own; dictated purely by aerodynamic considerations.
> > Uncomfortable as hell, yet the ride might be exciting enough to make you
> > forget it. After a two hour ride I could hardly walk, but that doesn't
> > mean it wasn't worth it!
> >
> > If I were building a sub for moderate or low visibility water (think
> > Carsten) a "flyer" would not be a viable option, so I'd never even
> > consider a prone position.
> >
> > Cheers,
> >
> > Alec
> >
> >
> > -----Original Message-----
> > From: Carsten Standfuss [mailto:MerlinSub@t-online.de]
> > Sent: Friday, November 07, 2003 10:32 AM
> > To: personal_submersibles@psubs.org
> > Subject: Prone position.. was Re: [PSUBS-MAILIST] Carsten: Sgt. Pepper
> >
> > What was it about the prone position that was uncomfortable?  My current
> > design is prone and about the same length, but with a 700mm-750mm
> > (~28"-30") diameter, a
> > hanging harness (think hanggliders), and a sloped chest-hip pad with
> > chin-rest that keeps most of the weight off the elbows and neck.
> >
> > Warm Regards
> > Shawn
> >
> > Shawn the answer is simple - build a 1:1 scale mockeup from unexpensive
> > material - in your wifes kittchen maybe. Than go in and test it so long
> > you want - if you build a sub according to class standards - a single
> > seater = 72 hours..
> >
> > If you find it after 3-4 hours still comfortable - maybe okay.
> > In Sgt.Peppers about 2 hours is the border. (540 m diameter) If you want
> > to sit for some minutes in the sub - you need about a diamter of at
> > least 900 mm ..
> >
> > On problem on Sgt.Peppers is that you can not reach the technic near
> > your legs and feets with the hands.. so all technic which need control
> > or maintance during the dive has to be in the area of your hands.. -
> > thats the area were also your shoulders are..
> >
> > hmm.. build a plywood, paper something mockeup and test it for hours..
> >
> > I build a 1:1 mockeup of Sgt.Peppers and test it before I build the real
> > thing - but I test it only for minutes - 5 Minutes there - 10 minutes
> > this. That was wrong. Test it at leat so long as you wish to dive - and
> > than add 100 % - if you fell comfortable - okay build it..
> >
> > regards Carsten
> >
> > ================================================================
> > Deze e-mail is door E-mail Virus Scan van Het Net gecontroleerd op
> virussen. Zie voor meer informatie: http://www.hetnet.nl/evs/
> >

-- 
"Without deviation from the norm, progress is not possible" - F. Zappa