[PSUBS-MAILIST] Towing...

Wed Sep 9 17:34:09 EDT 2015

I would stick very closely to what Vance has said. Very closely.

If you tow from only the battery pods with a bridle then it can roll the sub.  The shorter high rope prevents this.

You need to pull from low to stop the nose diving but when it veers off to the side from slowing or wave action you need the top rope as well.

Pulling from only the top limits you to about 3 knots unless it is towed from high up on the tow vessel.  My penny’s worth.  Hugh

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Thursday, 10 September 2015 8:34 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Towing...

Vance,

what about towing from a low point at the front?

One of my thoughts was to have a low frontal tow point with a short length

of rope from it with a clip on the end. This is clipped on to a higher point on the sub

when not in use & clipped on to the towing rope when needed. This is so that you don't get wet 

trying to attach to a point below the water line.

Alan

  _____  

From: via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org 
Sent: Thursday, September 10, 2015 6:35 AM
Subject: Re: [PSUBS-MAILIST] Towing...

James,

Before you weld towing eyes on the front of your battery pods, you might try making some circular clamps to go around the front of each pod and attach towing eyes to those.  

That way you could test the concept first and possibly refine it.

Jim

In a message dated 9/9/2015 1:10:29 P.M. Central Daylight Time, personal_submersibles at psubs.org writes:

The Bionic Guppy is pretty long and heavy though.
Hank

  _____  

From: via Personal_Submersibles <personal_submersibles at psubs.org>; 
To: <personal_submersibles at psubs.org>; 
Subject: Re: [PSUBS-MAILIST] Towing... 
Sent: Wed, Sep 9, 2015 5:02:51 PM 

If you pick up those three towing points so that everything pulls evenly in calm water, it will go a long way toward keeping things stable when things start pushing and pulling in different directions.  

Vance

-----Original Message-----
From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Wed, Sep 9, 2015 12:04 pm
Subject: Re: [PSUBS-MAILIST] Towing...

Thanks Vance, 

I did think of maybe towing from the battery pods.  Maybe i'll weld on a couple of towing eyes.  Something else I should have thought of before..... 

will check out options later. 

regards 

James 

On 9 September 2015 at 16:38, via Personal_Submersibles <personal_submersibles at psubs.org> wrote: 

The force applied that high and that close to the center of gravity will make her dive and squirm. Pull hard enough, she'll crab out to one side and roll toward the boat. It will be hard not to spill your tea. 

Vance

-----Original Message-----
From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Wed, Sep 9, 2015 9:21 am
Subject: Re: [PSUBS-MAILIST] Towing...

That's what I was thinking.  However, there is a video of someone towing Bionic Guppy and they are pulling it from the lifting eye.  Different boat though. 

https://www.youtube.com/watch?v=ApUnGjTb4DQ 

On 9 September 2015 at 12:23, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote: 

Hi James, 

I think you need to tow from the front leading edge to avoid crabbing. 

Hank 

On Wednesday, September 9, 2015 3:36 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All, 

Has anyone towed a K boat from the forward lifting eye?  

I am going to tow my boat to a better diving location.  I think the best place to tow it would be the very front, on the hand rail mounting post.  At this point there is a 20mm stainless bar bolted through the forward tank and into the framework.  Although its a thick bar, I have a feeling it might get damaged if I tow the boat from that point.  Forward lifting eye would be better but ive got a feeling it might now tow very well. 

Any thoughts? 
Thanks 

James 

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