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Thanks Vance,
I hadn't thought of the fact that as you ascend /
descend using your thrusters
that this will affect their steering
ability.
Maybe I'll go with a rudder as well.
Regards Alan
----- Original Message -----
Sent: Sunday, May 23, 2010 12:05 PM
Subject: Re: [PSUBS-MAILIST]
Rudders
There are some issues with using pivoting thruster pairs for this sort
of double duty, especially in small thrusters on heavier vehicles. When you
vector down or up, or need to correct steering, forward thrust is lost. Also,
the lack of control surfaces means that any correction must be powered.
Vehicles will not continue to turn, for instance, once the power is switched
off. You can do very well without those control surfaces, of course-----until
you use a rudder and dive planes for awhile-----then you see what you've been
missing.
Vance
-----Original
Message----- From: Alan James <alanjames@xtra.co.nz> To:
personal_submersibles@psubs.org Sent: Sat, May 22, 2010 5:23 pm Subject:
Re: [PSUBS-MAILIST] Rudders
Thanks Pierre,
is there a discount on the posters with Psubs
membership?
Alan
----- Original Message -----
Sent: Saturday, May 22, 2010 11:23
PM
Subject: RE: [PSUBS-MAILIST]
Rudders
Yes
that’s me! Please stand in-line for a signed poster.
A
good design to control sub with 2 motor is to have them in the center of
mass (from front to rear) and as far away from each other (side to
side).
I
also have mine so they can rotate on the shaft. So I can use them for
up/down movement.
Pierre
Sorry Pierre,
It's clicked who you are.
The world famous
owner of "big".
Your email
name through me out.
below is a link
to a glossary of submarine terms found on the
"Deep search
site" that's quite good.
----- Original
Message -----
Sent: Saturday, May
22, 2010 4:13 PM
Subject: Re:
[PSUBS-MAILIST] Rudders
Any photos of
your sub you can refer me to?
-----
Original Message -----
Sent: Saturday,
May 22, 2010 2:37 PM
Subject: RE:
[PSUBS-MAILIST] Rudders
Hi
Alan,
My
use a very similair design with one motor on each side and I don,t have
a rudder. With one full foward and one full backward, I can almost turn
on the spot. Same as a bulldozer.
So
no, I would not waste time on rudders.
I have been
looking at some videos of a small 1 person semi-dry ambient sub in
action.
This sub
doesn't have a rudder & just uses differing motor speeds to
turn.
As I'm
building a small 1 person sub of a similar size with two PWM controlled
motors I'm wondering
wether a
rudder is going to be a waste of time for me. I did have a rudder in my
original design.
Any thoughts
on this thanks.
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