ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

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Jaysen
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Jaysen » Mon Mar 13, 2017 10:25 am

That makes a lot of sense. I'm really looking forward to seeing this come together.



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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Tue Mar 14, 2017 2:54 am

Thanks for the kind words Will and Jaysen.

Could only squeeze in one and a half hour's boat building today, so temporarily fitted the electric motor into its box, and dry fitted the internal baffle and the vented back face as discussed yesterday. Also test fitted the engine mounts.

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Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

Aripeka Angler
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Aripeka Angler » Tue Mar 14, 2017 8:10 am

Fascinating build! I love this hull and your hybrid concept. Keep up the great work :D
Richard
Completed boats...XF20 "Red Alert", Aripeka Angler's Strip Canoe
Currently building...PY12 Kayak and FS18 "Bare Bones"
If there is magic on this planet, it is contained in water. - Loren Eiseley

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cape man
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by cape man » Tue Mar 14, 2017 8:55 am

Can't wait to see how all that connects together. Hard to tell the scale from the pics. How big is that electric motor? Looks small for such a big boat.
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Tue Mar 14, 2017 10:48 pm

Appreciate the interest Richard.

Craig, the electric motor box is approximately 10" x 10" x 7", while the electric motor itself is approximately 8" in diameter and 6" long. It was sized to use battery power efficiently to produce 3 to-4 knots when in green zones, while the diesel motor should produce at least 15 knots outside green zones.
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Wed Mar 15, 2017 6:04 am

Pictured below is the Chinese manufactured engine control mechanism being used. It cost a lot less than brand name equivalents, but came without installation instructions. The single change lever drives two change cables – one for gearbox F-N-R, and one for engine throttle/revs.

Given the way the gearbox and engine are configured, the engine control mechanism needs to operate as follows.

To move the boat forward, push the lever down from horizontal (neutral), and the cable connected to the gearbox needs to pull aft from it to engage forward, and the cable connected to the engine throttle needs to pull aft to increase engine revs.

To move the boat aft, pull the lever up from horizontal, and the cable connected to the gearbox needs to push forward, and the cable connected to engine throttle needs to pull aft.

But as supplied, while the control mechanism is configured correctly for changing the gearbox into forward or reverse, it is configured incorrectly for increasing or decreasing engine revs. Instead of pulling, the throttle cable was pushing.

After many frustrating hours trying unsuccessfully to rectify this without instructions (and increasing self-recriminating swearing along the lines ‘which stupid f****** idiot paid good f****** dollars to buy this so called f****** bargain without any f****** instructions!?), I eventually drove an hour each way to get it sorted by a professional boat builder.

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Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Heimfried » Wed Mar 15, 2017 6:41 am

Hello
(I plan to start the building of an electric boat in the next weeks, after finishing my shop. Therefore I studied a lot about properties of electric motors.)
You are going to use a belt drive to transmit the motor torque to the propellor shaft if I understand right. Tighten the belt means to put radial load on the motor shaft.

Did you check if the bearings of your electric motor are capable to bear the radial load produced by the belt drive?
That is sometimes not the case, because the mechanic of a electric motor is focused on delivering torque, not so much on bearing axial and radial loads.

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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Jaysen » Wed Mar 15, 2017 9:05 am

glossieblack wrote:
Wed Mar 15, 2017 6:04 am
After many frustrating hours trying unsuccessfully to rectify this without instructions (and increasing self-recriminating swearing along the lines ‘which stupid f****** idiot paid good f****** dollars to buy this so called f****** bargain without any f****** instructions!?), I eventually drove an hour each way to get it sorted by a professional boat builder.
HA! I know that feeling well.

Was the solution to drill/tap an opposing cable mount point?

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Wed Mar 15, 2017 5:55 pm

Heimfried wrote:
Wed Mar 15, 2017 6:41 am
You are going to use a belt drive to transmit the motor torque to the propellor shaft if I understand right. Tighten the belt means to put radial load on the motor shaft. Did you check if the bearings of your electric motor are capable to bear the radial load produced by the belt drive?
Hi Heimfried, When I asked for a quote for the components for the e-drive subsystem, I specified that the e-motor had to be able to handle the radial loads involved. Eco Boats Australia has guaranteed that the supplied motor can. It's interesting to learn that you are building an electric powered boat. What type of boat, and what type of motor and batteries are you using? All the best for your project. :D
Jaysen wrote:
Wed Mar 15, 2017 9:05 am
Was the solution to drill/tap an opposing cable mount point?

No modification of parts was required Jaysen, just a reconfiguration of internal components. It turns out that the engine control unit is a knock off of a long produced Morse product, which allows you to configure components to have both the gear selection or throttle cables pushing or pulling. In other words, four variants possible.
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Fri Mar 17, 2017 4:05 am

To consolidate the record of this build in one place, I'm copying an answer from Jacques to a question I asked him in the Power Boat section. There I asked how many layers of 6" wide 12 oz biax tape were needed along each of the edge of the engine box.
jacquesmm wrote:
Thu Mar 16, 2017 12:32 pm
That means it will only take the weight of the electric motor? The torque is handled by motor mounts?
In that case, one layer of tape each side should be more than enough.
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

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