Thursday, June 27, 2019

Re: [Electric Boats] Re: Albin Vega direct drive?

 

Hi Michael

Thanks for your reply and your description of your setup. Just a question, is your motor mount made out of 10 mm aluminium and it is holding up ok?  

Den onsdag den 19. juni 2019 06.40.28 CEST skrev Michael Ryan mryanqld@gmail.com [electricboats] <electricboats@yahoogroups.com>:


 

Hi Mads
Yes exactly my situation as I live in Australia.. I ordered the 10kw kit from Thunderstruck and opted to put together my own reduction from parts sourced locally. It was not any cheaper than the TS reduction kit but it allowed me to use readily available parts here in Oz. To give you a guide here is a list of parts and their approximate cost in Australia in US Dollars.
Motor mount: 5083 10mm Aluminium plate. 5083 6x50mm Aluminium equal angle.  USD 100
Reduction: Pulleys (Specification 8M-HTD) P72-8M20F 72T & P22-8M20F 22T Including taper locks & 720 8M Belt. USD210
Bearing, Keys & Bolts: 25mm Square flanged housing and bearing. UCF205, 25mm Split Collar, keys & various SS bolts and nuts. USD100
I also opted to fit a new cutless bearing and PYI Packless no drip shaft seal at the same time. 
All up about USD500, forget the budget it always costs more than you think!

On Wed, Jun 19, 2019 at 12:11 AM Mads Hurley mads.hurley@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

Thanks for all your replies, its greatly appreciated. The reason that I'm asking the question about gear reduction or direct drive is because of the simplicity in the setup, without the gear reduction (as I see it), and that a gear reduction setup is at bit pricey. I live in Denmark and with postage, taxes and customs (+25% + 3%) the gear reduction is quite costly for me. I guess the gear reduction is the way to go, and I'll be looking into getting a setup made locally instead of getting it shipped from the states.

 

Thanks!      



Den tirsdag den 18. juni 2019 06.57.13 CEST skrev Michael Ryan mryanqld@gmail.com [electricboats] <electricboats@yahoogroups.com>:


 

Simple answer! Assuming the exact same power input to a direct driven prop shaft or a driven reduction system! The power at the prop with a driven reduction system will be less due to friction of course.  

On Tue, Jun 18, 2019 at 12:51 PM Bill Farina bfarina@venture-1.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

I'm not sure how I misquoted anything.

I was only wondering if having a reduction gear would make you use more power to go a designated distance as opposed to using direct drive?

On 6/16/2019 2:33 PM, Hydroweb Yahoo hydroweb@yahoo.com [electricboats] wrote:
Whoa what does all this mean why is this stuff so confusing? 

On Jun 16, 2019, at 11:45 AM, pembertonkevin pembertonkevin@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:

 
Wow! Somehow my post on this thread is misquoted. Truth be told none of my post was quoted..

Anyhow, as long as the motor is turning it is not locked rotor. In the past some have said direct drive did not work for  them.

A motor rpm is a mechanical thing( much better that it stays together right?).
Running at slower rpm the fan will not move as much air. Better to remove the motors fan and use a thermostat controlled fan to keep the motor heat within design limits. 

Keep in mind the hp ratings of an electric motor is with fan in place, you will be increasing hp a little bit and not use as many watts if the fan has been removed. You will still use power with the external fan, but because your fan is better controlled you should not use as much. 


Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: "Bill Farina bfarina@venture-1.com [electricboats]" <electricboats@yahoogroups.com>
Date: 6/15/19 7:15 PM (GMT-07:00)
Subject: Re: [Electric Boats] Re: Albin Vega direct drive?

 

Another thing that would seem to be problematic with using a reduction gear would be that higher RPM would mean greater power consumption for distance covered. Is this true?

On 6/15/2019 8:06 AM, Kevin Pemberton pembertonkevin@gmail..com [electricboats] wrote:


Can anyone confirm this is accurate and does anyone here use their motor without the gear reduction and simply avoid pushing the motor higher than the 2500 rpm the prop works best at?

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Kind regards Mick 0414 264 312



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Kind regards Mick 0414 264 312

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Re: [Electric Boats] Thank You

 

Welcome Rowan!

On Thu, Jun 27, 2019 at 9:58 AM 'Rowan Maroun' adeshotech@email.sc [electricboats] <electricboats@yahoogroups.com> wrote:
 

Hi all and thank you for welcoming me to this group; this is just a little blurb about me:

 

I live in Seychelles (Indian Ocean somewhere) and am an avid boater, sailor, diver, fisherman, metal detectorist. I work as a technical manager for a marine retailer/importer and am still very actively involved in all electronic/hydraulic installations we carry out, mostly nav equipment.

I have a deep fascination with electric mobility, energy capture and storage.

I am in the infant stages (seed) of sourcing a small sail boat (27 – 35ft max) which I will refit completely, the end goal being 100% self-sufficient. Like most, my budget is limited but want to use that as an advantage during the project to squeeze the best solution out of every buck.

Now I have 5000+ posts to get through…

 

Rowan

 

 



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Larry Brown
S/V Trident
Palm Harbor, FL
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Wednesday, June 26, 2019

[Electric Boats] Thank You

 

Hi all and thank you for welcoming me to this group; this is just a little blurb about me:

 

I live in Seychelles (Indian Ocean somewhere) and am an avid boater, sailor, diver, fisherman, metal detectorist. I work as a technical manager for a marine retailer/importer and am still very actively involved in all electronic/hydraulic installations we carry out, mostly nav equipment.

I have a deep fascination with electric mobility, energy capture and storage.

I am in the infant stages (seed) of sourcing a small sail boat (27 – 35ft max) which I will refit completely, the end goal being 100% self-sufficient. Like most, my budget is limited but want to use that as an advantage during the project to squeeze the best solution out of every buck.

Now I have 5000+ posts to get through…

 

Rowan

 

 

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Posted by: "Rowan Maroun" <adeshotech@email.sc>
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Friday, June 21, 2019

Re: [Electric Boats] Re: Albin Vega direct drive?

 

Breaking belts that sounds like a worry. From my understanding high RPM and a tight radius smaller gear are the biggest causes of poor belt life. I have selected 8M HTD spec pulleys and belt. The belt is an Optibelt brand. I think that Thunderstruck use imperial Classic H spec. Do you know the part number of the belts that you use that will tell you the spec. The advantage of timing gears and belts is that it easy to go to a higher spec by simply replacing the gears and belt. I am going to get a spare belt. I will shop around as their are higher performance belts available which claim higher service life! They are more expensive of course. I think they use Kevlar fibre or something like that in the strands. Gates have one that I will check out. Would be interested to know what Thunderstruck supply with the kits.

On Fri, Jun 21, 2019 at 11:24 PM 66b6dcd5b59507e7d751ea81382ea1f6 <no_reply@yahoogroups..com> wrote:
 

Thanks. I have a 2 ft deep bilge, so not really an issue, but your point is fair.

John R



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Kind regards Mick 0414 264 312

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Posted by: Michael Ryan <mryanqld@gmail.com>
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Re: [Electric Boats] Re: Albin Vega direct drive?

 

Thanks for the responses re vibration.   My thoughts are that if it is not a unbalanced prop or very worn cutlass bearing then it might just be the two points of flexibility that the system has.   The cutlass bearing is never really a tight fit even when new right?   So there is some amount of angular movement there?  The double sprocket chain coupling that connects the prop shaft to the Thunderstruck reduction is another point of movement.   Perhaps when running and getting a lot of thrust from the prop (I measured 180 pounds of thrust produced at the dock by the prop when delivering 3000 watts to the Sevcon controller), these two couplings are sort of wobbling in phase with each other, causing the thrumming vibration at the higher power levels?


When the boat had the diesel engine in it, there was only the one point of flexing, the cutlass bearing.   The connection from the prop shaft to the motor transmission shaft was a rigid one, with a four bolt flange.   The mass of the diesel engine at 400+ pounds also probably had a big dampening effect on any shaft thrust or vibration.

So...I am thinking about adding a pillow block bearing between the end of the PSS dripless seal and the chain coupler, to lock down the position of the shaft.   Our shaft is 1 inch diameter.   The bearing would need to be able to handle axial and radial thrust, so perhaps something like a tapered roller bearing...

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Thursday, June 20, 2019

Re: [Electric Boats] Re: Albin Vega direct drive?

 

Thanks. I have a 2 ft deep bilge, so not really an issue, but your point is fair.

John R

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