Re: [electricboats] repurposing torqeedo 2.0 to inboard engine?

Carston, 

Forget about using an outboard. Your boat is very similar to my previous boat, pacific seacraft Orion, and is not designed for an outboard.

Get the thunderstruck 10kw kit, sell torqueedo, or keep it for the dinghy. 

I would ditch the wind generator, get more solar, Get a 48v to 12v converter. Then you only need 1 battery pack.

The battery pack is the biggest decision. I would get lithium iron phosphate. If you are only using it for in and out of the marina, I would get 5kw/hours. And if you need to go for longer motoring trips, get a Honda 2000 generator.

Kevin 

On Mon, May 17, 2021, 9:37 AM john via groups.io <oak_box=yahoo.com@groups.io> wrote:

Carsten,

I think the bad reverse performance is mainly an issue of the outboard having to fight against the hull and keel.  

I previously had a Catalina 27 with a 10hp 4-stroke outboard in a motor well (behind the keel and rudder).  Same thing - did great in forward, but very limited power in reverse.  If I had a strong north wind, I wasn't able to back into it with sufficient control to safely leave the marina.

This may be somewhat also due to the prop being less efficient in reverse (due to cup design).  But I suspect fighting the keel was the bigger issue.

I really wish the economics were better for electric.

I currently have a Chris Craft Commander 410 with two Chevy V8 454 big block engines that are not healthy.  I still believe the engines can be brought back - but finding a good mechanic that will show up and get the job done on my lake is proving extremely frustrating!   I've thought more than a few times about repowering the boat with electric (probably mostly hybrid, running off a generator - to keep the cost of the battery bank within reason).  Butttt....   Getting those two V8 blocks out of the engine room below the main salon will be extremely difficult.  Plus - best possible speed will still be limited to 5-6mph - slower than a trawler, and slower than many sailboats.  I've gotten used to the Dark Side, and prefer a cruising speed of 7-10mph, and really like the option of being able to get up on plane if I need to so that I can get somewhere in a hurry if necessary.

I have taken a LOT of inspiration from this web site:  http://www.deny.org/Escape_the_American_Dream/Work_Blog/Work_Blog.html, as his boat is very close to mine (his is a few years older, and mine has the flybridge - meaning more drag, weight, and windage - but at least in the ball park).  But it also serves as a good reality check.

John

On Monday, May 17, 2021, 01:22:14 AM CDT, Carsten via groups.io <carstensemail=yahoo.com@groups.io> wrote:

Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?

When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)

By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,

Carsten

On Monday, 17 May 2021, 11:22:18 GMT+8, john via groups.io <oak_box=yahoo.com@groups.io> wrote:

Carsten,

If you're really going to go that route, I'd recommend two Torqeedo T4.0's.

I mounted one as an experiment on an Catalina 30.  One Torqeedo would push the boat at very slow speed. Reverse was abysmal.  I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.  I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.  But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail=yahoo.com@groups.io> wrote:

What is your use of the Torqueedo now ?

It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?

Doubled power, and far better maneuverability when docking.

You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.

No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@gmail.com <yellowchair@gmail.com> wrote:

I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

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