[PSUBS-MAILIST] Water jets
hank pronk via Personal_Submersibles
personal_submersibles at psubs.org
Sun Oct 26 16:48:55 EDT 2014
A sub like that is fine if you are launching off your yacht. Should be called the turtle, bet it's fun to pilot
Hank--------------------------------------------
On Sun, 10/26/14, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Subject: Re: [PSUBS-MAILIST] Water jets
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Received: Sunday, October 26, 2014, 4:34 PM
When I was having lunch
at Nuytco, I was told that
Hawke's
flying sub went upside down on the surface
& couldn't be righted by the pilot. So
something else to
consider.
Alan
Sent from my iPad
> On 27/10/2014, at 9:25
am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
wrote:
>
>
> Alan,
> Not much roll
when you have a couple thousand pounds of ballast. I light
low volume sub might get some roll.
> It
would be a bugger to get into at the surface though. Maybe
leave the rolling for airplanes.
>
Hank--------------------------------------------
> On Sun, 10/26/14, Alan James via
Personal_Submersibles <personal_submersibles at psubs.org>
wrote:
>
> Subject:
Re: [PSUBS-MAILIST] Water jets
> To:
"Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
> Received: Sunday, October 26, 2014, 4:14
PM
>
> Hi
> Hank,Graham
> wanted to
rotate his jets separately so he
>
couldget a roll / flying
> type motion.
So he would need to havetwo
> separate
intakes that rotated identically to the vertical
> outletsto
> acheive
that without getting the forward motion &
> addedinefficiencies.
>
I wonder what sort of roll you could get with
> aconventional
> set
up.You
> must have tried that Hank /
Alec. Do you get much of a
> tiltwhen
you
> have your vertical thrusters
working in
> differentdirections?Alan
>
>
From: hank pronk via
>
Personal_Submersibles
> <personal_submersibles at psubs.org>
>
> To: Personal
> Submersibles General Discussion
> <personal_submersibles at psubs.org>
>
> Sent: Monday,
> October 27, 2014 8:57 AM
> Subject: Re:
>
[PSUBS-MAILIST] Water jets
>
>
>
> Alan,
> I did
> not think of that, but your right. You
could put a shroud
> over the inlet that
is inline with the discharge so then the
> pump is pulling and pushing.
>
Hank--------------------------------------------
> On Sun, 10/26/14, Alan James via
> Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
>
> Subject: Re:
>
[PSUBS-MAILIST] Water jets
> To:
> "Personal Submersibles General
Discussion" <personal_submersibles at psubs.org>
> Received: Sunday, October 26, 2014, 3:50
PM
>
> One
> problem
> I can see
is that if you have your Jet
>
> suckingwater in
>
from the front & you
> pivot your
outlets to get
>
>
verticalmotion,
> then you will get
forward
> movement from the suction
> ofthe inlet
> at a
similar rate.Also I
> did
> a bit of research on jet propulsion a
couple of
> weeks back&
> what I read
> said it
was inefficient compared to conventional
> propulsion.Alan
>
> From: Alec Smyth
via
>
>
Personal_Submersibles
> <personal_submersibles at psubs.org>
> To: Personal
> Submersibles
>
General Discussion
> <personal_submersibles at psubs.org>
>
> Sent:
Monday, October
>
>
27, 2014 8:11 AM
> Subject:
Re:
> [PSUBS-MAILIST] Water jets
>
>
>
> I
>
> don't think
water jets are necessarily inefficient,
>
but
> if there is considerable piping
around
> of the water before
> it exits through the
> jets, that's what I was referring
> to.
> However, even
that was not meant as criticism, it is
> just a normal trade-off. It is surely
less
> efficient than a
> conventional
>
direct-coupled prop, but you also get
>
> entanglement-resistance and
maneuverability.
>
>
> On Sun,
> Oct 26, 2014 at
>
10:11 AM, Marc de Piolenc
> via
Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> There
is
> nothing inherently inefficient
about
> waterjets. There are
> commercial fast
>
ferries using them and getting very good
>
> thrust per
horsepower - better than any supercavitating
> propeller could do at the same speed,
> certainly.
>
>
>
> Lousy design will of course
> produce poor results, and jets
> are much
> less
amenable to rule-of-thumb construction than
> open propellers. But whether it is
"well
> known" or
> not, good design will
> produce good results.
>
>
>
> Marc de Piolenc
>
>
>
> On 10/26/2014 8:41 PM, hank pronk via
> Personal_Submersibles
> wrote:
>
>
>
>
> Graham,
>
> In the world of
marine jet drive it is well
> known that
jet
> drive takes two times the
> horse power to do the same job.
> Jet drive
> is well
suited to a craft that needs a shallow
> draft. I think you will find it
very
> complicated to
> control and it will be very
> inefficient. I have been down
> this road, I
> love
the concept but abandoned it. If you go
> forward may I suggest you start with a
jet
> drive. It is
> not a simple part to
> replicate. The impeller tolerances
> are
> critical. I
have a jet unit on the shelf I could
>
donate to your project. The jet is from a
> jet ski. I would
>
consider a single rear
> motor on a full
gimbal.
>
>
> Hank
--------------------------------------------
>
> On Sun, 10/26/14,
Graham
> Bayliss via
Personal_Submersibles
> <personal_submersibles at psubs.org>
> wrote:
>
>
>
> Subject: [PSUBS-MAILIST]
> (no subject)
>
> To:
>
"'Personal Submersibles General
>
>
Discussion'" <personal_submersibles at psubs.org>
>
> Received:
Sunday, October
> 26, 2014, 7:39 AM
>
>
>
>
#yiv9417249292
>
>
#yiv9417249292 --
>
>
>
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>
> #yiv9417249292 Hi I
> am near the end of my build
>
> of my k350 and
have started to look at new
> designs
I
> am
>
> interested in building a flyer sub
and have
> come up with
> a
>
> design which will include a vectored
motor
> drive this
>
will
>
> enable
my flyer to hover and stop where
> ever I
want. I
> have
>
> designed a motor unit which will
drive a
> fan type
>
propeller
>
> as
an intake this will force water to the
>
rear of the
> unit
>
> where it is
compressed then it is
> forced into
> ducting
>
> which will take the water to four
nozzles
> on the side
> of
>
> the craft. The nozzles are able to
turn
> three hundred
> and
>
> sixty degrees both side are
independent
> of one another
> so
>
> rolls will be achievable. The reason
for a
> vectored motor
> is
>
> you only need one motor source and
one
> power pack this
> will
>
> ease the maintenance and increase
the
> enjoyment of
>
using
>
> your
sub. I am interested in the clubs
>
thought of this
> kind
>
> of design.
Graham
>
>
>
>
> -----Inline Attachment Follows-----
>
>
>
>
>
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>
>
>
>
> --
>
>
> Archivale catalog:
http://www.archivale.com/catalog
>
> Polymath weblog:
http://www.archivale.com/weblog
>
> Translations (ProZ
profile):
> http://www.proz.com/profile/639380
>
> Translations
(BeWords
> profile): http://www.bewords.com/Marc-dePiolenc
>
> Ducted fans: http://massflow.archivale.com/
>
>
>
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